BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 Under no circumstances put synthetic gear lube in the rear diff!

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cloud 9



Posts : 563
Join date : 2009-10-03
Age : 48
Location : Dover, NH

PostSubject: Under no circumstances put synthetic gear lube in the rear diff!   Thu Jul 03, 2014 10:54 pm

So for awhile now I have been trying to figure out my posi problem. When I did the disc conversion on the caprice I put Delco synthetic gear lube in the rear diff. All of the sudden the posi was not working...just lots of smoke coming from the passenger rear  Evil or Very Mad  and the pinion seal started leaking even though it was just replaced. I have read and seen many blogs and entries on the national forum on this also. So, long story short I replaced the fluid with straight 80/90 lube with no additive. Posi is hooking up awesome again and no chirping while turning. I am going to run it like this for awhile and see how it acts. Just wanted to put my experience on the forum to maybe save someone some hassle down the road. I know a bunch of guys run this in the rears with no weird effects, but I won't ever put that crap in the caprice again. FWIW
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sdstick



Posts : 4282
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Under no circumstances put synthetic gear lube in the rear diff!   Fri Jul 04, 2014 10:50 am

I always used what the factory recommended (including the additive)
Never a problem
Additive does make a difference.
I know there are alot of times when the factory methods can be improved upon but....
I usually stay away from synthetic BECAUSE of its tendency to leak.
Thanks for the heads up... Arrow 

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96BBB 28K 3.42 Bolt-ons
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mikiehews



Posts : 372
Join date : 2011-02-03
Age : 41
Location : brockton

PostSubject: Re: Under no circumstances put synthetic gear lube in the rear diff!   Sat Jul 05, 2014 2:44 pm

I'm having a similar issue. Just changed the pinion seal and there is a slow leak. I'm going to drain the synthetic fluid
and go back to the regular with additive.
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cloud 9



Posts : 563
Join date : 2009-10-03
Age : 48
Location : Dover, NH

PostSubject: Re: Under no circumstances put synthetic gear lube in the rear diff!   Sat Jul 05, 2014 5:02 pm

I just used Valvoline 80/90 weight. I haven't put any of the additive in yet. I honestly think a whole bottle is too much. I will try half a bottle first and see how it acts. Right now it is hooking up great at WOT off the line. Just a little bit of chirping then it is all go. Twisted Evil 
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Cadet57



Posts : 4478
Join date : 2010-03-14
Age : 29
Location : Chicopee, MA

PostSubject: Re: Under no circumstances put synthetic gear lube in the rear diff!   Mon Jul 07, 2014 10:06 am

You still need the posi additive.

PS, your signature takes about 4 hours to load on a phone.  Wink 
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cloud 9



Posts : 563
Join date : 2009-10-03
Age : 48
Location : Dover, NH

PostSubject: Re: Under no circumstances put synthetic gear lube in the rear diff!   Mon Jul 07, 2014 12:37 pm

Cadet57 wrote:
You still need the posi additive.

PS, your signature takes about 4 hours to load on a phone.  Wink 

I just added three quarters of a bottle .  Arrow  working fine.
And you may need a new phone  Rolling Eyes 
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Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Re: Under no circumstances put synthetic gear lube in the rear diff!   Mon Jul 07, 2014 3:06 pm

Cadet57 wrote:
You still need the posi additive.

PS, your signature takes about 4 hours to load on a phone.  Wink 

4 hrs? You must have a really good phone!
It takes about half a day to load on mine. And then the other half of the day to look at it  Razz 
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No Moa



Posts : 3880
Join date : 2009-02-21
Age : 44
Location : Midcoast Maine

PostSubject: Re: Under no circumstances put synthetic gear lube in the rear diff!   Mon Jul 07, 2014 8:05 pm

That synthetic shit is to slippery, I had the same issue also.
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Under no circumstances put synthetic gear lube in the rear diff!
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