t5 question

[jocko]

WC, you got me to thinking - so I had to look it up in the service manual. Here's the book version of the answer (it is cut/pasted in via pdf, but the info is there):

Section 2
T5 WC & STD On- Vehicle Service and Troubleshooting
2-1. MAINTENANCE
2-2 GENERAL. The only periodic maintenance
required for the TREMEC T5 transmission is to
maintain proper lubrication.
2-3. LUBRICATION SCHEDULE. Refer to the
Vehicle Owner’s Manual or Service Manual.
CAUTION
Excessive temperatures may bread down the
transmission lubricant (refer to vehicle service
manual for maximum allowable temperature). If there
is reason to believe that the transmission has been
subjected to temperatures exceeding 275° F, change
the lubricant immediately.
2-4. APPROVED LUBRICANT. Most T5
transmission models use DexronÒ II automatic
transmission fluid. Refer the vehicle owner’s manual
or service manual for lubricant specifications.
CAUTION
Do not mix different bands or types of transmission
lubricant. DO NOT USE GEAR OIL IN THE T5
TRANSMISSION SINCE THIS MAY DAMAGE THE
BLOCKING RING MATERIAL.


So, while the service manual is referring to both STD and HD (i.e. their terminology for non-WC and WC) in this section, it does state "most" and to check the owner's manual.... So, it kinda leaves the door open until is states in all caps (that's how it is in the manual, I didn't all cap it for emphasis) to NOT USE GEAR OIL - and it's referring to both wc and non-wc..

Having said all that - I probably should have elaborated a bit in my earlier reply - the "book" answer is that both use ATF, unless directed otherwise. And I do know of several builders that use gear oil even in the WC's and swear by it. So, personally, I don't think there will be any harm done either way - but if it were my transmission, I'd stick with ATF.

Good discussion!