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I have a 68 dart that has an 8 3/4 rear, 3.91 posi and it whines. It started as a B body limited slip rear that I had narrowed and I bought a 3.91 posi, had it rebuilt locally and it's always made noise. The car has a 400 ci engine and a 727 with a 3000 stall converter and it. Homemade slide a link bars I fabbed from some guy's pics I found on here and it hooks up great. Any suggestions would be helpfull, Thanks
 

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If the guy who rebuilt it didnt set the crush collar right, It's going to make noise. I'm pretty sure it will also be noisy if the pinion depth is off in relation to the ring gear. I would also have to guess since the rear was narrowed, one of the bearing retainers could be off and causing a noisy axle bearing. Did you use a straight bar as a guide running through the housing while it was being welded?
 

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Here's some help if you want:

Dwanye in Seattle, he's got a shop and it's his job to troubleshoot 8 3/4's 206.524.1078

John (Mopar Madness, Ault, CO.) this guy has been doing everything involving Mopar since the 50's, 970.834.1828

Good luck Dude! o----o<>
 
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