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#77376 05/10/2007 3:17 AM | Joined: Mar 2000 Posts: 137 'Bolter | | 'Bolter Joined: Mar 2000 Posts: 137 | i have a 12 bolt posi from a 71 chevy 1/2 ton truck in a 66 carryall, the problem with it is a chatter when i turn left ,after it has been driven several miles {say 150 miles or good and warmed up?}right turns seem to be ok? can new clutch plates be bought at gm or? and should that cure the problem ? i have not torn it apart yet to inspect the plates ?what should i look for on used plates ? thanks mike | | |
#77377 05/10/2007 3:50 AM | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | I'm not an expert on these rears, but my first thought is that you need to make sure it has the right gear lube and additive in it.
Are you sure its the right stuff? If not that's the first thing I would look at.
Second thought is that those clutch plates are a wear item and the amount of trouble rebuilding a rear represents, I'd think it would make more sense to look hard for new parts first.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble... | | |
#77378 05/10/2007 2:02 PM | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | First thing we always did at the shop was drain & refill the diff w/proper lube using the GM additive, then find a parking lot & drive in figure 8's for a while to work the lube into the clutches. I'd say at least 50% time it worked. If no difference at all, tear into it. | | |
#77379 05/10/2007 8:49 PM | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | The type of rear end with the tapered cone clutches MUST have the additive in it. The clutch-pack types will work with regular gear lube. It won't hurt to add the stuff the dealer sells to either type of rear end, but without it, you'll have nothing but grief from cone clutches. Try a drain & refill with GM limited slip additive before doing anything else.
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
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#77380 05/11/2007 12:17 AM | Joined: Mar 2000 Posts: 137 'Bolter | | 'Bolter Joined: Mar 2000 Posts: 137 | thanks for the replys ,i guess i should of said in the first post that i have already done the gm oil,and additive plus the figure 8S all with no help it still had a chatter after about 60-80 miles on a left turn!plus we tried an extra bottle of additive per an old gm mechanic ! so i believe i had better tear it apart ,any ideas on tearing it apart? i think all needed is to remove crosspin and gears and pull clutches ? been a long time ?thanks mike | | |
#77381 05/11/2007 8:44 PM | Joined: Sep 2006 Posts: 1,276 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 1,276 | My Chevelle had the clutch type and was very lube finicky. Had to add the additive the lubes that said they work for limited slip diffs didn't. | | |
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