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Click on image for the lowdown. 
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| | | Forums66 Topics128,082 Posts1,055,961 Members48,430 | | Most Online14,466 Apr 26th, 2026 | | AD Chevy Trucks Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: Feb 2004 Posts: 29,782 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,782 | The chatter is caused by the cone clutches grabbing as the rear end differentiates axle speed in a low-speed turn. Regardless of where you get the posi additive, Ford, Chrysler, or GM, it's all the same stuff. Mix it according to the directions on the bottle, and it should cure your problem. At heavy throttle the axles will lock if any slippage is present, so the additive is just to prevent chatter at low speeds with little if any power applied. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
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