If the vehicle has an Automatic Transmission: Dextron II
If the vehicle has a Manual Trans, its complicated.
Depending on Trans model:
The 77mm 5-speed and 89mm 4-speed overdrive use Dextron II ATF.
The 117mm 4-speed uses API GL5 SAE 80W90 gear lubricant.
GM recommends Synchromesh Trans Fluid (1052931) in both the 85mm 4-speed and 5-speed.
Hope this helps!
I did some investigation and couldn't find what type of fluid for MT, I know there is a drain plug on the lower trans. I would remove it a check the fluid, 90 W has a distict smell, and of coarse auto. trans. fluid is red, and I have heard of motor oil also (smell), I have removed 90W from stand. tran. and added auto trans. fluid, but that was because of cold weather conditions.
Any high quality brand name trans fluid is fine. I have a preference for Quacker State.
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