AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Monster transmission 6l80e1/20/2024 ![]() That said, there are some important differences between them to remember to help with the selection process. Zack Farah: GM has made so many great overdrive transmissions over the years that it can be challenging to pick the right one for your car. Therefore, the overdrive transmissions offer a lower overall First gear ratio, which translates to better off-the-line performance and better fuel economy since they don’t load the motor as much when getting the car moving from a stop. In comparison, a TH400 has a 2.48:1 First gear ratio and the 350 has a 2.52:1 ratio. The First gear ratios on the 200-4R and 700-R4 are 2.74:1 and 3.06:1, respectively. Lastly, the 200-4R and 700-R4 have lower First gear ratios than the TH350 and TH400. Less parasitic drag equals more power to the rear wheels. They require less torque and horsepower to spin them up, compared to a TH350 or a TH400. Another factor to consider is that popular overdrives like the 200-4R and 700-R4 are low-inertia transmissions. On the other hand, that 3,000 rpm multiplied by an overdrive ratio of 0.70:1 yields a cruise rpm of 2,100. With a TH350 or a TH400, your car would be turning about 3,000 rpm at 70 mph. Let’s say you have a car with a 3.73:1 ring-and-pinion ratio and 27-inch diameter rear tires. First off, most GM overdrives have a Fourth gear ratio of 0.70:1. Zack Farah: You can usually expect a 30 percent savings in fuel consumption with an overdrive transmission due to three primary factors. The only downside to this is that there are so many great transmissions to choose from that several GM transmissions will work great for any given application. This yields an economy of scales that drives down costs, and ensures parts compatibility for both factory and aftermarket components for decades. Secondly, what GM does better than any other manufacturer on earth is stick with a small handful of trans models, keep them in production for decades, and continually enhance their durability along the way. First off, GM simply builds kickass transmissions. In the hot rodding world, GM automatics are routinely swapped into Fords and Mopars, but you’ll hardly ever find a C6 or a TorqueFlite in a Chevy. The venerable Powerglide has been the gold standard of durability and efficiency in drag racing since the ’50s, and the workhorse TH400 has been factory installed in everything from big-block Chevelles to Ferraris to military-spec Hummers. GM automatic transmissions quite literally rule the world. ![]()
0 Comments
Read More
Leave a Reply. |