I ended up swapping out the Mopar ATF+4 in favour of GM Synchromesh fluid in my 6 speed getrag manual transmission recently. I hated the way the transmission was shifting on 1st to 2nd gear upshifts, and some downshifts. The vehicle had about 700 miles on it. As soon as I swapped fluids the shifting problems disappeared, the entire transmission feels superb and totally transformed. I was worried that the tranny might have some cold weather shifting issues with the thicker viscosity fluid, but the odd thing is that it now shifts best in extreme cold weather use. Cold weather shifting is far better than the ATF+4 fluid could provide. I never expected that. The shifting improvement is felt across all temps though.
I've read many people rave about the shift improvement by going with GM synchromesh fluid in various different cars from Hondas to BMW's, typical cars that don't normally recommend a fluid like synchromesh. My car is in the same boat. Just wondering what it is about this type of fluid that works well in different types of trannies/vehicles ?. Anything about the makeup of this fluid that makes it work well in manual trannies ?. Do the other synchromesh type fluids on the market - Redline MTL and Amsoil MTF - use a similar chemistry in their fluids ?. It just seems that synchros really like something about the synchromesh fluid that your typical ATF fluid can't provide. Not sure what it is, but it is such a dramatic improvement that I can't imagine auto manufacturers trying to stick with ATF fluids in their trannies when they can do so much better with other fluids.
I've read many people rave about the shift improvement by going with GM synchromesh fluid in various different cars from Hondas to BMW's, typical cars that don't normally recommend a fluid like synchromesh. My car is in the same boat. Just wondering what it is about this type of fluid that works well in different types of trannies/vehicles ?. Anything about the makeup of this fluid that makes it work well in manual trannies ?. Do the other synchromesh type fluids on the market - Redline MTL and Amsoil MTF - use a similar chemistry in their fluids ?. It just seems that synchros really like something about the synchromesh fluid that your typical ATF fluid can't provide. Not sure what it is, but it is such a dramatic improvement that I can't imagine auto manufacturers trying to stick with ATF fluids in their trannies when they can do so much better with other fluids.
