i tried searching but it's not working right. what transmission fluid is everyone running in their 3650? i read some people say to use gm syncromesh, some say use dexron atf, some say royal purple. what is recommened by everyone here?

thanks

 

Pennzoils syncromesh ( auto zone ), its same as GM syncromesh but cheaper.

 

Royal Purple.

 

valvoline Dexron III/Mercon.

 

Right from the service manual, I beleive cliffyk originally posted this info.

"TREMEC engineers have recommended Texaco-Havoline Dexron III/Mercon Non-Synthetic ATF. The most recent Ford owner's manuals specify 3.17 quarts of a non-synthetic Mercon ATF. Synthetic fluids willcause prematurewear of the synchronizer materials."[/b]

 

What fluid would you guys recommend for a t45?

 

i'm using the texaco-havoline stuff. i just replaced the clutch after 98'000+ miles and so far so good.

 

I used RP Synchromax or if that wasn't available I'd use Mobile 1 ATF.

 

I changed mine last time with synthetic Dexron/Mercon and didn't see mush improvement in shift quality. So with all the discussion out there I am going back to regularValvoline Dexron/Mercron

 

Do not put synthetics into these trannies. They will eat the synchros, causing them to pit and soften. Put in Dexron III/Mercon or equivilant. 3.17 quarts for the 3650, 3.5 for the T-45.