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I know that whenever it comes to selecting a high-quality transmission fluid for TH 350, or TH400 for that matter, it always opens up a can of worm. TH350 and TH400 drivers are hobbyists; they are sensitive and won’t compromise on standards.
I also know for a fact that automatic tranny rebuilds are difficult. A couple of years ago, it used to be easy. Nowadays, even if you want to choose automatic transmission fluid, you have to be careful. The process is complex because a lot of brands have stepped into the industry over the last decade. Back in my days, things were easy-peasy.
There was no YouTube, there were hardly any weblogs and that allowed us to work easily. Now with the excess information overload, the millennials are very easily distracted. So, when you are out there on the interwebs, looking for transmission fluid for a TH350 and/or TH400, you are bound to get either partial information or some nuggets of misguided info!
Pressed For Time – Here’s Our Top Picks
The Great Debate about Transmission Fluid for TH350 & TH400:
Several years ago, the agenda behind the performance-related tranny build was different. People relied on old practices. Brands were well established; it wasn’t easy to come by a high-quality build. For TH series, people normally used Type F transmission fluids. The results were excellent, even by modern standards.
Today, companies, such as; Nascar, have got over 4, 5 different types of transmission fluids for different category vehicles. In that order, it is not easy to choose the right type of fluid for your TH350 or TH400 build. F series is considered an acceptable brand because we have synthetic variations of automatic transmission fluids.
The question is, is it acceptable to use the “F” type fluid, or retaining to contemporary Dexron V, and VI series a better alternative? The first rule of thumb is to be mindful of ATF rating. The future of automatic transmission vehicle industry looks very promising. It is expected that normal household cars will be having up to 8 gears.
Right now, several companies are offering ATF certified transmission fluid products. If you want something durable for your brand new TH350, TH400 or later models in that series, make sure that the ATF rating is being followed. A few days ago, we published a post about the difference between gear oil and transmission fluid. It is a very helpful guide, especially for beginners who’re having a hard time choosing between different brands.
- Enhanced friction durability for smooth transmission performance
- Meets DEXRON-III H requirements and satisfies requirements of DEXRON, DEXRON-III, IIE and II
- Formulated with full-synthetic base stocks and advanced additive technology to meet the challenging demands of automatic transmissions.
- Enhanced anti-shudder protection for smooth shifting and maximum power transfer
- High Film Strength Helps to Dramatically Reduce Heat and Wear
- Automatic Transmissions Generate a Great Deal of Heat and Depend on Transmission Fluid for Cooling and Protection
Are Transmission Fluids Backward Compatible?
These days, each car company has created a specific type of gear oil and transmission fluid for their vehicles. Add the common misconception that transmission fluids are backward compatible with the older generation of TH350 and TH400 series cars. You will eventually find yourself slogging through the slippery slope of engine oil, transmission fluids, and vice versa.
The backward compatibility part is not true. The modern version of fluids is compatible with only the type of cars they are made for. On that note, some people argue that when it comes to TH350 and TH400, the Dexron VI series fluid is backward compatible. I’d say that isn’t true. Dex VI is good transmission fluid, but it was made to enhance the performance of modern models of TH350 and TH400. Using Dexron VI on older models of the aforementioned generation will not harness the same results.
What If Speed Is Your Main Concern for TH350 and TH400?
If you want to use your TH350 or TH400 for faster and speedier performance, perhaps Ford type F fluid is best for transmission purpose. I’d recommend Dexron III too, but Dex 3 is more of a friendly companion to TH350. For TH400, you have more torque pushing through a high profile engine. Therefore, you’re going to have to make an intelligent decision.
The good news is that many oil companies have reportedly addressed the concerns on backward transmission fluid compatibility. For that very reason, these manufacturers have reportedly released special transmission fluid with a combination of different oils. What’s even better is the fact that these fluids are certified and often endorsed by popular companies.
Moving on, there is also a synthetic variation of transmission fluids. This type generally lasts longer, and the change intervals are not frequent. For instance, Exxon-Mobil’s mPAO is gaining a lot of positive traction for being a go-to choice for people looking for TH350 and TH400 transmission fluids.
But if you are really looking for the best ATF, you’re going to have to stick with pure synthetic transmission fluid. Just like synthetic motor oil, the transmission fluid category is offering semi-synthetic and full synthetic variants. In that case, you should go for full synthetic transmission fluid because it has minimum additives, and it lasts longer than a semi-synthetic ATF.
Make Sure Your TH350 and TH400 Are Getting a Proper Fill:
We, at ‘My Engine Needs’, conducted a recent survey on automatic transmission fluid. It was discovered that the most damaging factor was the drivers’ inability to properly fill the transmission pan. Ideally, the fluid should level with the pan’s rail height. Don’t go over it, or lower than the desired limit for optimal results.
Don’t worry about overfilling. Especially if you are driving a TH400, it is acceptable to overfill the transmission pan by a quart or an extra ½ percent. For such vehicles, a little bit of extra transmission fluid is much better than under filling. Since it is a Turbo category performance-hungry vehicle, TH400 has been known from time to time for pushing the fluid away from the filter. If you are driving too fast, the G-force can cause the line pressure to drop, which further enables clutch slip. As a result, your automatic transmission will fail at high speed.
For more details on which type of transmission fluid is suitable for TH350 and TH400, don’t forget to revisit this webpage. We will be updating it soon with additional content. For now, we’d love for you to share your thoughts through the comments section below.
Last update on 2020-04-07 / Affiliate links / Images from Amazon Product Advertising API