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05-10-2011, 06:11 PM
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#1 |
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Registered User
Join Date: Jul 2007
Location: Rogersville, Missouri
Posts: 89
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Positrac rear end
Have a little concern.
I think my positrac clutches on my rear end are going bad on my '65. It grinds when going around corners especially if I accelerate even a bit, and now it is getting worse. Will or did this do any harm to my 700 r-4 and the drive line while I was driving it for...quite a while until noticing it getting bad today? Thanks guys. '70GMCStep 1970 GMC Stepside  1965 Chevy LWB 
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05-10-2011, 09:12 PM
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#2 |
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1 thing at a time is progress.
Join Date: Jun 2007
Location: Ball Ground GA
Posts: 5,511
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Re: Positrac rear end
When was the last time you changed the fluid and did you put any posi additive in it?
__________________
Alan
Philippians 2:14-16 |
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05-10-2011, 11:06 PM
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#3 |
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Registered User
Join Date: Jul 2007
Location: Rogersville, Missouri
Posts: 89
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Re: Positrac rear end
About two years ago and it was added to the rear end.
'70GMCStep '70 GMC Stepside '65 Chevy C-10
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05-11-2011, 01:32 AM
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#4 |
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60-66 Nut
  Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
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Re: Positrac rear end
If indeed your clutches are going out in your posi, that isn't going to hurt your trans or driveshaft any. Have you checked your U-joints?
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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05-11-2011, 06:01 PM
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#5 |
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Registered User
Join Date: Jul 2010
Location: Tucson Arizona
Posts: 165
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Re: Positrac rear end
Time to get a true-trac.
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05-11-2011, 06:26 PM
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#6 |
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Registered User
Join Date: Aug 2009
Location: Detroit MI
Posts: 1,209
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Re: Positrac rear end
I think all posi's make noise at some time or another , it seems to me that the posi lubes are not all the same , friction modifiers differ from factory lubes to aftermarket lubes ... go to the dealer and get the GM stuff and if one doenst do it get another ......as long as it burns both tires dont care if it makes noise...mine makes noise and I just ignore it ....
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05-11-2011, 06:35 PM
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#7 |
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Account Suspended
Join Date: Sep 2009
Location: High Plains of Colorado
Posts: 2,485
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Re: Positrac rear end
It definately puts some high loading into the rear suspension components and can overstress bushings, I learned this the hard way on my coil over shock suspended Model A that runs a 12 bolt posi.
Before I put the posi-additive in it the rear axle the non-slipping posi ate the bushings out of the shocks where they attached to the rear axle. I put enough additive in it such that it didn't chatter going around corners, installed some new bushings in the shocks and haven't had any problems since. Might be worth looking at your track bar bushings and the trailing arm bushings. Better safe than sorry. Happy trails! John PS: yes it does still leave two nice burnout tracks, so the posi clutches are grabbing during hard launches. Last edited by lakeroadster; 05-11-2011 at 06:39 PM. |
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