<VV> gear lube leveling problem

J Bruce Weeks jbruceweeks at yahoo.com
Thu Jul 23 21:49:09 EDT 2015

I'll follow up with you at Homecoming, Dave. Hitting second below 2500 RPM is getting boring.


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From:"Dave Keillor" <dkeillor at tconcepts.com>
Date:Thu, Jul 23, 2015 at 9:30 PM
Subject:Re: gear lube leveling problem

I had a discussion with Mark, Clark's tech guy, and we ended up agreeing to disagree.  He said that the gear oil matched the original GM spec for the Corvair.  I said that there had been a lot of progress in lubricants since the Corvair was new.  And there it ended.

Having said that, I recently switched from Amsoil transaxle oil (75-90) to Brad Penn GL4 (80-90).  I was having some noise from the transmission when the car was idling in neutral with the clutch disengaged and the transaxle hot.  The noise was only audible from inside the car, so it wasn't a huge deal -- yet.  Several people told me that they had a similar experience with the lighter synthetic.  Today was the first trial and the noise seemed to be gone and the shifting was still great (it's a '65 transmission).  More testing is required.

Dave Keillor

On Thu, Jul 23, 2015 at 8:11 PM, J Bruce Weeks <jbruceweeks at yahoo.com> wrote:

Makes me wonder why Clark's doesn't sell something that works for both, given that's what's needed.

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From:"Dave Keillor" <dkeillor at tconcepts.com>
Date:Thu, Jul 23, 2015 at 8:13 PM
Subject:Re: gear lube leveling problem

Clark's sells the Amsoil gear oil, not the GL-4 transaxle oil.

Dave Keillor

On Thu, Jul 23, 2015 at 6:21 PM, J Bruce Weeks via VirtualVairs <virtualvairs at corvair.org> wrote:

Curious, why continue to maintain the 'communication' between trans and diff? Given that it's getting harder to find lube that works well in both.

Corsa had GL5 in it when I got her and started suffering synchro clashes. So I changed out to Redline and it cleared up. Then on VV I hear Redline doesn't work with hyphoids. So I change it out (again) to Amsoil from Clark's, as they recommend. Synchro clashes are back, though not as bad.

Why not put a solid (no hole) gasket between them and put Redline in the trans, Amsoil in the diff?

Bruce Weeks

Message: 5
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Looking at a mated differential and transmission, without measuring, the two 
filler plugs look to be located about halfway between the lower two cases 
mounting bolts.. Of course, if ideally they are exactly equally located, and 
the cast boss is large enough, it might be possible to have a filling plug 
hole drilled slightly off "up" or "down".

Chuck S

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