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| fergo | issue with 77 rear end | ||
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Guru Newb
 
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hi, i have a 77 corvette and having some issues with my rear end. I had the diff rebuilt, rear trailing arms rebuilt, wheelbearings rebuilt with tolerances. new shocks, new universals. The issue i am having is when moving slowly and turning the wheel i have a banging noise in the rear end. not just a noise but its like the whole car gets bumped a bit, like its shunted sideways. Now i live in Australia so no mechanics have ever seen this stuff and have no idea, so i am pretty much forced to do it myself with some friends mechanic shop. any thoughts?
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Posted on: 2011/4/10 23:48
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| Matatk | Re: issue with 77 rear end | ||
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Webmaster
 
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When you put in the new fluid did you add friction modifier?
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Posted on: 2011/4/11 11:18
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| BillH | Re: issue with 77 rear end | ||
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The Stig Moderator
 
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Yea, that could be it especially if everything's good above a slow speed. |
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Posted on: 2011/4/11 14:04
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| Trae1976 | Re: issue with 77 rear end | ||
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2012 Memorial Day Car Show Winner!
 
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Matatk wrote:  That would be the place to start. Mine did the same thing when we first got it back on the road. New fluid and a couple of bottles of Posi Additive smoothed it right out.   |
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Posted on: 2011/4/11 14:20
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| captmike13 | Re: issue with 77 rear end | ||
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Elite Guru
 
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Welcome aboard.
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Posted on: 2011/4/11 15:46
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Mike| bogus | Re: issue with 77 rear end | ||
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Grand Imperial Pooh-Bah
 
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Welcome!
 Friction modifier would help a LOT! Hm... Where in Oz are you? There are some pretty good Corvette shops in the Brisbane area. |
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Posted on: 2011/4/11 16:06
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| Durango_Boy | Re: issue with 77 rear end | ||
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Elite Guru
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I would also take a second look at the U-joints and the angles of the half shaft in relation to the horizon line.
What you're describing can also be the kick from a U-joint that is binding. Even one needle can cause a whole world of hurt. |
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Posted on: 2011/4/11 18:42
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| fergo | Re: issue with 77 rear end | ||
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Guru Newb
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hi guys,
yes i have added the GM lube to the diff, thanks for the replies. I will check out the half shafts as this might be the only thing i have not checked. Yes i am in brisbane and am yet to find a good corvette shops, found a few that think they are good, but once you dig below the surface you get the blank deer headlight stare that i love so much. |
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Posted on: 2011/5/3 22:54
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| Frad | Re: issue with 77 rear end | ||
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Guru Newb
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The issue i am having is when moving slowly and turning the wheel i have a banging noise in the rear end. not just a noise but its like the whole car gets bumped sideways a bit, like its shunted sideways.
How are the mounts for the differential to the frame ????? How is the transmission mount ????? |
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Posted on: 2012/3/26 5:04
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| bogus | Re: issue with 77 rear end | ||
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Grand Imperial Pooh-Bah
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Frad - Is your Vette a 1977? When turning the wheel, are you saying when the wheel is rotating, or when turning the steering wheel, and the differential is actually being asked to work?
One favour, no spamming, please. |
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Posted on: 2012/3/26 6:59
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| BillH | Re: issue with 77 rear end | ||
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The Stig Moderator
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Yea, really. However, if the car is lurching sideways, check for missing trailing arm alignment shims. |
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Posted on: 2012/3/26 14:02
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