Replacing Fluid in T56&Rear Diff.
11-18-2008, 08:34 AM
#4
From the factory the T56 uses DEXRON III fluid and is certified "fill-for-life," requiring no fluid changes. The clutch is activated hydraulically, which (in a perfect world) automatically compensates for clutch disc wear, eliminating manual adjustments. The six-speed was originally designed to require virtually no maintenance.
That being said, if you want to change the fluid and the transmission has never been upgraded to the carbon fiber blocker rings, go back with DEXRON III fluid. If it has been upgraded to the carbon blocker rings, we like to use Mobil 1 Synthetic ATF. Of course the higher end stuff is good as well: Royal Purple, Amsoil, etc.
That being said, if you want to change the fluid and the transmission has never been upgraded to the carbon fiber blocker rings, go back with DEXRON III fluid. If it has been upgraded to the carbon blocker rings, we like to use Mobil 1 Synthetic ATF. Of course the higher end stuff is good as well: Royal Purple, Amsoil, etc.
11-18-2008, 03:12 PM
#5
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The gearbox is all original, and i am sure that the rear diff has had service before, but i dont know about the tranny itself. I heard that GM synchromesh is really good stuff too?