'58 BW T10 Lube Procedure

[Duke W.]

Re: '58 BW T10 Lube Procedure

That's probably okay. API gear oil viscosities use a different scale than engine oils. So the absolute viscosity of 80W-90 gear oil is in the same ballpark as a SAE 50 engine oil.

The spec for my '88 MBZ five-speed is SAE 20 non-detergent engine oil or ATF. I currently have Redline MTL in it which is a 70W-75 GL-4. I also use MTL in my Cosworth Vega's BW T-50 five-speed, which originally speced ATF.

The original spec for the transaxle in my '91 MR2 was ATF, but Toyota changed it to 75W-90 GL-4, and I use Redline MT-90, which meets that spec.

As far as the old Corvette four-speeds are concerned, since my T-10 showed no evidence of "yellow metal" corrosion when I rebuilt it at 115K miles, I still use and recommend 80W-90 GL-5.

Duke

[Don H.]

Re: '58 BW T10 Lube Procedure

Dave, I am not sure where the procedure is listed, possibly in the ST-12 (number ? - the GM service manual). It is pretty easy, in nuetral there is a slot in the shifter main body to put in a rod (allen wrench will do). If it will not go in you need to adjust the arms (1-2, 3-4, or reverse) until it goes in. One thing that complicates it is the lack of clearance between the shifter and the body tunnel. Good luck, Don H.

[David B.]

Re: '58 BW T10 Lube Procedure

Thank you, Don. I'm planning to check out the lube level of my T10 and diff today.

Question for the group here:

I don't have a lift and can't get under the tranny area of the car without jacking the front end (I think I can get to the diff without lifting the back end). How can I check the tranny oil while keeping the car level? If I jack up the front end, won't that skew the oil level?

I guess what I'm asking is: How do you guys who don't have a lift, gain access to the fill hole of a level T10?

Thanks!

Dave