Just had my t-5 transmision rebuilt and was told to put 10 30W motor oil in it. What would the best oil for this 1986 trans? Thanks Robert
I would use a good name brand quality oil ! Each of us has their special brand that we use . What ever you have been happy with in your cars is what I would use ! HAPPY HOLIDAYS !!!
Talk to Flat Ernie he has done a lot of research on these trannies right from the early to the late models.
Most of the info i've read call's for ATF.. But, in that reading i've heard of people using everything from ATF to motor oil. The T5 i have at one point used 30wt synthetic oil..actually had it marked on the side of the case with a paint pen. I flushed it and am using synthetic ATF as recommended by many who have run these for many miles.... That's what i'd suggest now too. No problems and shift's smoothly.
The ATF was for ease of shifting. An old transmission guy here who rebuilt a bunch of them recommended 20w50 castrol, that's what he put in all his rebuilds. I've even topped them off with 90w when they were getting old and noisy... Brian
I've used 70w gear oil, ATF but now I use Pennzoil Syncromesh. Pennzoil® Synchromesh Fluid <TABLE height=180 cellSpacing=0 cellPadding=0 width=170 align=center border=0><TBODY><TR><TD width=15 height=180></TD><TD align=middle width=140 height=180></TD><TD vAlign=bottom align=middle width=15 height=180></TD></TR></TBODY></TABLE> Pennzoil® Synchromesh Fluid is a synchromesh transmission fluid designed for certain manual transaxles and manual transmissions used by General Motors or Chrysler. Pennzoil® Synchromesh Fluid is formulated with high quality paraffinic base stocks, a fluidity modifier, multifunctional performance additives, corrosion inhibitors, a foam suppressor and a shear stable viscosity index improver additive. It provides excellent oxidation stability, low temperature performance, excellent synchronizer performance and compatibility with yellow metals, such as bronze, br*** and copper components found in manual transaxles and transmissions. This product will satisfactorily lubricate General Motors or Chrysler manual transaxles and transmissions from -40°C to +150°C. Benefits: Exhibits excellent low temperature performance Meets GM Specification 9985648 and Chrylser Specification MS-9224 Suitable for use in GM manual transaxles and transmissions requiring GM Part No. 12345349 or 12345577 Suitable for use in Chrylser transaxles and transmissions requiring Part No. 4874464 Excellent synchronizer performance Excellent yellow metal compatibility I don't work for Pennzoil. .
The early NWC T5 called for 70WT gear oil. The later WC T5 called for ATF. I've heard of folks running everything in between. Including Redline MTL and GM's Synchromesh (both good products). Personally, I run synthetic ATF in all my T5 - even the NWC. I would never run motor oil in a transmission - the additive packages are different. However, like engine oil, it's like religion and politics - you'll get a variety of answers.
I've run Mobil 1 synthetic ATF in a T5 trans since '96 with no problems at all. ( '65 F100 with a healthy 351W ) Smooth shifting trans, and the synthetic makes it smoother.
It will be going in the 63 C-10 inline 6 (250). I have also been told to use 1/2 ATF 1/2 90W, just not sure if I should mix them both or just use one or the other. Hey Rusty how about that Ford truck you got a while back ago?
atf or syncromesh oil should be used for ease of shifting at any temp.I was a GM tech for the last 25 years until last Friday when the dealership closed.
Not too many NWC T5's around and they should use gear oil of your choice. The WC T5's have smaller lube p***ages and roller bearings requiring ATF. I bought a working "rebuilt" NWC T5 that had straight ATF in it and the gear oil - bronze bushings and synchro's were worn prematurely. WC and NWC easily ID's by countershaft cup bearing on front: Flat, smooth cup bearing = NWC Recessed, ridged cup = WC PB
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