During those cold winter times, driving becomes pretty tough, but there is another problem you have to deal with. It’s the fluid that you are using in your transmission! This trans fluid can freeze, and it will make shifting a lot rougher than it should be.
So, what can you do now? You might think you are alone out there, but most drivers face this pretty common issue in winters. Some drivers have a solution for this, but others might be looking for an answer here.
If you have an Allison 1000, we hope to help you with this guide. So scroll down to get a full scoop for the best transmission fluid for Allison 1000 and some other relevant information.

What is the Best Transmission Fluid for Allison 1000?
The best transmission fluid for Alison 1000 is the ACDelco Dexron VI Automatic Transmission Fluid. This fluid is backward compatible with previous Dexron fluids. Therefore, you can use it as an improved replacement for your older vehicles or transmission systems using the previous version of Dexron fluids.
The new fluid guarantees improved performance with better friction durability, aeration, and viscosity stability. Oxidation resistance and foam control. This fluid also can improve fuel economy and ensure longer transmission life. In addition, it can guarantee consistent shift performance even in harsh weather and road conditions.
Why is ACDelco Dexron VI Considered the Best?
One of the best features of using ACDelco Dexron VI is backward compatibility with any previous versions of Dexron fluids. As a result, you can use the upgraded version as a much-improved replacement for your older vehicles and transmissions.
The upgrade comes with a much-improved performance compared to previous Dexron fluids. It ensures better friction durability, foam ad aeration control, oxidation resistance, and stability in viscosity.We recommend buying your favorite toothbrush at super low prices with free shipping, and you can also pick up your order at the store on the same day.
Best Transmission Fluid for Allison 1000 Reviews
1. ACDelco Dexron VI Automatic Transmission Fluid – Best Overall

Features
- Better fuel economy.
- Longer transmission life.
- Consistent shift performance.
- Extended drain intervals.
Specifications
- Size: 1-Gallon.
- Type: Dexron VI/Automatic.
- Compatibility: For vehicles that need Dexron VI, III, or II(E).
- Country of Origin: United States.
Description
If you have been using Dexron fluid for a long time and now want to switch, this is the best option for you to consider. It will allow you to adjust if you have used Dexron before easily. Even the police vans are compatible with this fluid, showing how reliable this fluid is.
It can deliver smooth and consistent shift performance even in harsh conditions. Moreover, it doesn’t degrade a lot over time. The fluid can extend the life of transmissions and improve their overall performance.
It can also improve your overall fuel efficiency, but only if you do proper and regular maintenance. Your drain intervals will extend significantly, and you won’t have to worry about your shift performance in harsh situations.
Pros
- It is backward compatible with older Dexron ATFs.
- It can improve fuel efficiency and transmission life.
- Longer drain intervals even in harsh situations and weather conditions.
Cons
- Not fully synthetic.
Recommendation
A top choice for driving in harsh, conscious, and tough weather. It works for all transmissions that run on older Dexron ATFs and improve overall performance.
2. Castrol Transmax Automatic Transmission Fluid – Best for Preventing Overheating

Features
- Better friction durability.
- Superior hot weather protection.
- Enhances oxidation resistance.
- Smoother transmission performance
Specifications
- Size: 1-Gallon,
- Type: Dexron/Mercon/Automatic.
- Compatibility: For all Ford models (1983 – 1996) & GM 2005 or earlier models.
- Country of Origin: United States.
Description
If your car overheats or whines a lot, you need to use this ATF. It will not only ensure smoother transmission but will also reduce any fraction issues within your vehicle.
This fluid will take some time to adjust. You might feel no difference at all in the beginning. But once you start driving your vehicle, you will notice a significant change. Things become much easier during shifting and transmission.
But you will have to flush your fluid regularly, which means that you will have to refill every 30,000 miles of driving. And your experience will start improving day by day. The fluid will also help you in dealing with excessive vibration.
Pros
- Improved durability against friction with better transmission effectiveness.
- Excellent for highway and city travel with better high-temperature protection.
- It comes with exceptional oxidation resistance to avid viscosity rises.
Cons
- Non-compatibility results in high vehicle temperature and increased vibrations.
Recommendation
It is a top choice for older vehicles that have to deal with tough road and weather conditions. It will take some time to adjust, but it will start performing once it goes in.
3. Valvoline Dexron VI/Mercon LV Automatic Transmission Fluid – Best for High-Temperature Engines & Sudden Shifts

Features
- Consistent shift performance.
- Improved trans fluid life.
- No fluid breakdown at high temperatures.
- Exceptional oxidative stability.
Specifications
- Size: 1-Gallon.
- Type: Automatic.
- Compatibility: For Allison C-4, GM Dexron II/IIIm/VI, Ford Mercon LV, Toyota/Lexus Type T/T-II/T-IV/WS, Honda/Acura ATF-Z1, Nissan/Infiniti Matic-D/J/K/S, Hyundai/Kia SP-II/III/IV, SPH-IV, BMW 7045E/ETL 8072B/LA2634/LT71141, Mercedes Benz NAG-1, Volvo 1161521/1161540/97340/1273.41, & VW/Audi G-052-025-A2/162-A1.
- Country of Origin: United States.
Description
This fluid is an excellent option for all high-temperature engines, and it has been around for quite some time. It allows transmissions to perform better and increase the overall lifespan significantly.
This fluid works the best in chilly areas and will outperform all other fluids in winter conditions. In addition, it can assist you in maintaining your auto gearbox, and you won’t have to go through many fluid changes over time.
Moreover, this fluid will also help you deal with your rough or sudden shifts. You won’t have to deal with any slippage, and the shifts will be as smooth as anything you can imagine.
Pros
- It can seal components to prevent breakdowns.
- Boosts transmission longevity and engineers with a blend of base oils.
- Features advanced additives for improved oil flow at low temperatures.
Cons
- You might feel more vibrations, so you will have to maintain your vehicle very well.
Recommendation
This fluid is better suited for newer vehicles or transmissions. But if you have an old vehicle, you will have to maintain it if you want this fluid to work properly.
4. Allison TranSynd CTCS Transmission Fluid – Best for Preventing Vehicle Vibrations

Features
- Superb wear resistance.
- Better viscosity stability.
- Longer drain intervals.
Specifications
- Size: 1-Gallon.
- Type: Full-synthetic automatic.
- Compatibility: Allison TES 668 approved.
- Country of Origin: United States.
Description
This is the best fluid that you can go for if you are looking to prevent vehicle vibrations for good. The fluid is oxidatively stable, so it will not thicken over time. As a result, you will notice that your transmission doesn’t feel jerky even if you are driving on winding roads.
It will also protect your gears keeping the shifting as smooth as possible. It might come with a hefty price tag, but you will get the results once you use it in your engine. The fluid tends to resist corrosion and ensures more heat resistance to keep wearing down to a minimum.
Pros
- The fluid protects your gearing system and keeps it safe from wear.
- Your anti-shudder endurance increases significantly.
- It provides friction stability with corrosion resistance.
Cons
- The fluid does come with a big price tag on it.
Recommendation
This fluid generates better heat resistance and prevents friction among the moving parts. So it is a top choice for hot weather conditions and rough roads.
5. Mobil Delvac Syn Automatic Transmission Fluid – Best Transcend Fluid Cheaper Alternative

Features
- Better transmission life.
- Smoother shifting.
- Allison approved
- Suitable for high-performance buses and trucks.
Specifications
- Size: 1-Gallon.
- Type: Automatic.
- Compatibility: Allison TES 295 approved
- Country of Origin: United States.
Description
Maye the transcend fluid is too expensive, and you are looking for a cheaper alternative! Well, this fluid is the best opinion for you to consider. However, if you have to deal with extreme cold in winters and are looking for a cheaper alternative to the transcend fluid, go for the Delvac.
This fluid also works pretty well on the highways. Moreover, you also won’t have to deal with draining your fluids repeatedly. It is pretty clean fluid, and you won’t also feel the burning sensation when your vehicle consumes this file.
Pros
- Helps in the extension of your transmission efficiency.
- It cleans transmission and prolongs its performance.
- Reduction in wear even at -54C.
Cons
- Only suitable for Alison 1000; otherwise, compatibility needs to be assessed.
Recommendation
This fluid is a good option if you drive in colder climates and regularly deal with temperatures below the freezing point.
6. Stone River Products Castrol TranSynd 668 Automatic Transmission Fluid – Best Full Synthetic ATF for Highways

Features
- Excellent wear resistance.
- Longer drain intervals.
- Better oxidation stability.
Specifications
- Size: 1-Gallon.
- Type: Automatic.
- Compatibility: Allison TES 668 approved and fits Allison 1000, 2000, and 2400 series transmissions.
- Country of Origin: United States.
Description
This full-synthetic automatic transmission fluid is designed for highway vehicles, and it ensures anti-wear performance with friction durability. It also comes with standard differentiation and aunty-shredder friction durability.
It is an excellent choice for improving your gear shifting, and your transmission won’t feel rough even on high roads. In addition, your gearbox will be protected, and you won’t see any brown-colored discharge coming out of your vehicle.
Pros
- It improves the overall protection of your gearbox.
- It ensures long-term clutch friction durability.
- You won’t have to bother about foaming and corrosion.
Cons
- Its price is a bit on the higher side.
Recommendation
It might come with a high price tag, but it is a high-performing fluid that is a top choice for vehicles that regularly go in rough climates and road conditions.
7. Xcalliber TES 295 Automatic Transmission Fluid – Best for All Allison Transmissions

Features
- Improved oxidation stability.
- Better friction durability.
- Quality wears resistance.
Specifications
- Size: 1-Gallon.
- Type: Automatic.
- Compatibility: Suitable for all Allison transmissions
- Country of Origin: United States.
Description
If you don’t want to go for any other option and don’t want to spend too much on your transmission fluid, consider the Xcalliber. This fluid is suitable for all Allison transmissions. You also don’t have to worry about the make of your vehicle. In addition, this fluid works with all older and newer vehicles pretty conveniently.
You won’t have to spend too much. Moreover, you won’t have to worry much about wear and tear in your gearbox and engine. The fluid will make everything smoother, and shifting becomes as easy as you like.
Pros
- It protects the gearbox of your vehicle.
- It also improves your clutch friction durability.
- Excellent for thermal oxidation and reduces oil thickening.
Cons
- Not a suitable option for any transmission outside Allison.
Recommendation
If you don’t drive any vehicle outside Allison, then the Xcalliber is a good choice overall for you to consider. But it won’t work outside this brand of transmission.
Best Transmission Fluid for Allison 1000 Buying Guide
There are some important factors that you must consider before choosing the best transmission fluid for Allison 1000.
Fluid type
There are different types of transmission fluids available. You have to look for the right fluid based on your vehicle’s type of transmission. You can have a look at your owner’s manual to find which type of transmission fluid is required for your vehicle. For example, you cannot use Dexron III in your Allison 1000 transmission. Pick the right one for the best performance.
Quantity
Different transmissions have different quantities. For instance, Allison 3000 transmission can only hold 29 quarts of fluid while Allison 4000 transmission can hold up to 48 quarts. However, most fluids are available in the packaging of 1-gallon bottles.
Brands
There are various brands available on the market. But only a few brands are more reliable than others. Therefore, you should look for brands like Castrol, Mobil, and Valvoline if you are looking for the best products.
Allison 1000 transmission fluid type
This transmission type was introduced back in 2005 and it is used by on-road trucks and uses a modular case design. It handles up to 620 lb of torque and has over 6 gear ratios with a reverse ratio of 4.49.
Allison 1000 transmission fluid capacity
Both fluid and filter change hold about 7.5 quarts. Other models of Allison transmission like the 2000,3000, and 4000 can hold between 15 quarts to 48 quarts of transmission fluid.
Allison 1000 transmission fluid pressure sensor location
The pressure sensor is located on the transmission housing right next to the pump. It relays the measurement of pressure from the pump when the engine is at work.

How much transmission fluid does an Allison 1000 hold
Both filter change and fluid hold about 7.5 quarts. This includes the pint for the spin-on.
Allison 1000 transmission fluid change procedure
- Get your vehicle ready by making sure ions in a flat and horizontal surface. Turn the engine off and apply the handbrake. Make sure to do this after using the vehicle for at least 10 minutes.
- Make sure your filling cap is not jammed. This is necessary so that you can use it to fill your sump once you change the oil. If the filling cap is jammed, visit your mechanic garage.
- Change the oil in the gearbox housing.
- Drain the converter.
- Fill your gearbox with new oil.
- Dispose of your used oil in an appropriate location.
How to check Allison 1000 transmission fluid?
Park your vehicle and keep the engine running. After applying the parking brake, place the shift lever in Park (P). With your foot on the brake pedal, keep the engine running for at least one minute and shift the lever to Drive (D), then shift to Neutral (N), then Reverse (R) to carefully fill the hydraulic system. Finally, shift the lever to Park (P). Allow your engine idly run at 500-800 rpm before slowly releasing the brake pedal.
Without switching off your engine, follow these steps –
You should note that the fluid must be hot to ensure an accurate check.
1. Operate the transmission at Drive (D) until you reach the normal operating temperature which is 160°F (71°C) to 200°F (93°C)
2. Pull out the dipstick and carefully wipe it with a clean towel or rag.
3. Push it back in all the way and wait three seconds and then pull it back out. Repeat the check procedure to verify the reading.
4. The safe operating level is within the HOT RUN band on the dipstick. The width of the HOT RUN band
Represents approximately 1.06 quart (1.0 liter) of fluid at normal operating temperature.
5. If the fluid level is not within the HOT RUN band, add or drain fluid as necessary to bring the fluid level to within the HOT RUN band.
6. If the fluid level is in the acceptable range, push the dipstick back in all the way.
This video should help you check the transmission fluid in Allison 1000.
Frequently Asking Questions
What kind of transmission fluid goes in a Duramax Allison Transmission?
It is important to know that all Duramax comes with an Allison transmission, although the Allison transmission may vary depending on the model. The best transmission fluid for a Duramax should be the best transmission fluid for an Allison transmission.
How many quarts of transmission fluid are in Allison 1000?
The Allison 1000 transmission holds exactly 7.4 quarts of transmission fluid. Converting this, it holds about 5 gallons of transmission fluid, it is important not to overfill the transmission to prevent leaks.
How often should you change the transmission fluid in Allison 1000?
According to GM transmission fluid in Allison 1000 should be changed after 25,000 to 100,000 miles. Other recommendations may state that you should change the fluid when the HD monitor indicates that the fluid needs to be changed, some others simply change the fluid when it changes color and emits a foul odor.
What kind of transmission fluid does Allison 1000 take?
Allison recommends its customers use the Allison Genuine TransSynd transmission fluid. So far, it’s the overall best. It is a premium universal power shift and synthetic transmission fluid. Not only does this fluid provides wear resistance, but it also improves the stability of viscosity and, improves gear protection. Allison Genuine Transynd synthetic fluid has been approved by TES 295 and TES
Can I use dex 3 transmission fluid in my Allison 1000?
Unfortunately, Dex 3 transmission fluids are no longer licensed or monitored. Hence, it is not advisable to use it for your Allison 1000 as it may cause damage to your vehicle.
How much transmission fluid drains out of an Allison 1000 with a deep pan?
Transmission fluids will need to be drained after 25,000 to 100,000 miles, and all fluids should be drained. If you are switching from a regular transmission fluid to a TES-approved fluid, you will need to do a double drain. Allison does not recommend that you flush your transmission fluid.
Is Dexron vi transmission fluid approved for Allison 1000 transmissions?
Dexron VI is approved and fully compatible with Allison 1000 as it prevents transmission fluid breakdown when the vehicle is operating at a high temperature, it also improves fuel efficiency and ensures that your transmission lasts longer.
Conclusion
There are different types of transmission fluids available on the market. However, the best transmission fluid for Alison 1000 is the ACDelco Dexron VI. It offers superior performance and better friction control. It also keeps your gearbox of top quality, and your vehicle can handle tough weather conditions.
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