The Stovebolt Site Forums The Shop Area Engine Shop tranny and rear end lube..??

what is the correct lube for the 4-speed tranny and the rear end in the '58 Apache??

mp90

thanks gazim

cjoe you can get it at NAPA.

got it yesterday and all changed all oils. changing coolant today....thanks

for my muncie 420,they say to use gl-4,not gl-5

suzy q antiques,

I think the SM420 and a Muncie 420 are the same thing. The quandary over which gear lube to use has to do with the amount of sulphur (anti-wear) in the product. The brass synchronizers react with sulphur and are eroded.

If you use the incorrect lube, my guess would be that in about 99 years you might see a problem.

I believe Novak Transmissions, who deal with this box quite a bit recommend GL-5. This oil thing is Voodoo territory.

Stuart

My manual states SAE 90 multipurpose gear lubricant. Personally, I'm using Lucas full synthetic 75w90, with a 70/30 mix of the Lucas gear oil and Lucas oil stabilizer in the trans.