90W or substitute?

[James S.]

Have the tranny back now and will install for the third time; wish me well.

I used up the last of my 90 weight oil and can't find any locally. I can find 80W-90W oil, but the service manual calls for straight 90W. Can I use 80W-90W without any problems for this 60 Vette BW 4 speed?

Thanks in advance.

Jim

[Don H.]

Re: 90W or substitute?

I believe that is what I have used for years with no problems. Don H.

[Joe L.]

Re: 90W or substitute?

Have the tranny back now and will install for the third time; wish me well.

I used up the last of my 90 weight oil and can't find any locally. I can find 80W-90W oil, but the service manual calls for straight 90W. Can I use 80W-90W without any problems for this 60 Vette BW 4 speed?

Thanks in advance.

Jim

Jim------


Absolutely, positively YES. In fact, the old GM #1052271 (now discontinued) which was specified by GM for use on most 1955 and later manual trans and differential applications was an 80W-90 lubricant.

[Domenic T.]

Re: 90W or substitute?

James,
What did they find wrong?

DOM

[James S.]

Re: 90W or substitute?

James,
What did they find wrong?

DOM

Thanks for asking Dom.

Larry from D&L spent a good half hour with the rebuilder (Bobby). Larry said that he knows what he is doing, and recommended to allow Bobby to rebuild again.

The "hub" that kept third gear from sliding into place was worn severely. The rebuilder cound not determine why it was so worn; he said it could have been the repop chinese bearings failed and caused inordinate amounts of lateral movement, and the keys inside the hub were worn as well.

It bothered me that the rebuilder could not determine why the transmission became inoperable. The only part that hasn't been replaced is the main shaft, but he told me that it was good to go. The smaller shaft was replaced with a new part by the first rebuilder up in MI.

Larry sent a decent used hub, new keys that fit in the hub to keep all parts aligned, new front and rear US made bearings (the bearings installed by the first rebuilder were chinese), new snap rings, new forks, new pilot bushing (bronze non-magnetic type), and a gasket set. Larry gave me a real good deal on the parts.

I'll go step by step again by the book for reinstall and hopefully the tranny will work like it should.

Thanks,

Jim

[Duke W.]

Re: 90W or substitute?

SAE Viscosity: 80W-90. API Service category: GL-5.

Like engine oil, you buy gear oil by SAE viscosity and API spec. BRAND DOES NOT MATTER. If the label says the above specs, it's okay to use.

It's commonly available in auto parts/big box stores in both national, local, and house brands.

If you go back far enough - like my 1963 Corvette Shop Manual - the spec is Mil-L-2105, commonly known as hypoid gear oil. It was eventually commercialized to GL-5, and the mil spec was cancelled a decade ago. The military now uses SAE 80W-90 or 75W-90 GL-5, and you can bet they buy it from the lowest bidder.

Duke

[Domenic T.]

Re: 90W or substitute?

James,

Hope this ends your problems and all works good.

Let us know.

DOM




quote=James Sanny (49162);561614]Thanks for asking Dom.

Larry from D&L spent a good half hour with the rebuilder (Bobby). Larry said that he knows what he is doing, and recommended to allow Bobby to rebuild again.

The "hub" that kept third gear from sliding into place was worn severely. The rebuilder cound not determine why it was so worn; he said it could have been the repop chinese bearings failed and caused inordinate amounts of lateral movement, and the keys inside the hub were worn as well.

It bothered me that the rebuilder could not determine why the transmission became inoperable. The only part that hasn't been replaced is the main shaft, but he told me that it was good to go. The smaller shaft was replaced with a new part by the first rebuilder up in MI.

Larry sent a decent used hub, new keys that fit in the hub to keep all parts aligned, new front and rear US made bearings (the bearings installed by the first rebuilder were chinese), new snap rings, new forks, new pilot bushing (bronze non-magnetic type), and a gasket set. Larry gave me a real good deal on the parts.

I'll go step by step again by the book for reinstall and hopefully the tranny will work like it should.

Thanks,

Jim[/quote]

[James S.]

Re: 90W or substitute?

James,

Hope this ends your problems and all works good.

Let us know.

DOM




quote=James Sanny (49162);561614]Thanks for asking Dom.

Larry from D&L spent a good half hour with the rebuilder (Bobby). Larry said that he knows what he is doing, and recommended to allow Bobby to rebuild again.

The "hub" that kept third gear from sliding into place was worn severely. The rebuilder cound not determine why it was so worn; he said it could have been the repop chinese bearings failed and caused inordinate amounts of lateral movement, and the keys inside the hub were worn as well.

It bothered me that the rebuilder could not determine why the transmission became inoperable. The only part that hasn't been replaced is the main shaft, but he told me that it was good to go. The smaller shaft was replaced with a new part by the first rebuilder up in MI.

Larry sent a decent used hub, new keys that fit in the hub to keep all parts aligned, new front and rear US made bearings (the bearings installed by the first rebuilder were chinese), new snap rings, new forks, new pilot bushing (bronze non-magnetic type), and a gasket set. Larry gave me a real good deal on the parts.

I'll go step by step again by the book for reinstall and hopefully the tranny will work like it should.

Thanks,

Jim

[/quote]
Dom,

Thanks for the words of encouragement!

I set up the shifter on the bench again and all gears shift fine. Shifter goes into third very smoothly.

Jim

[James S.]

Re: 90W or substitute?

Thanks to all who assisted in the oil question.

Jim

[Joe L.]

Re: 90W or substitute?

Dom,

Thanks for the words of encouragement!

I set up the shifter on the bench again and all gears shift fine. Shifter goes into third very smoothly.

Jim[/quote]


Jim------


"If it works on the bench it will work in the car" (unless there's something else that's causing the problem like an incompletely disengaging clutch)