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#1
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Got a noise in my rear end.
I recently had a 273 gear and posi installed in my 65 catalina rear end. Since then when I turn left even at a slow speed I get a clumping noise in the left side of the rear end. It doesn't do it turning right or going straight down the road at all. It sounds fine really no noise at all only when turning left at like a corner when taking off from a dead stop. Any suggestions or ideas what might be wrong? Ujoints are good.
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#2
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axel bearing
or wrong oil Limited Slip Axle Lubricant Additive - 4 oz. Genuine GM Fluid 88900330
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Donate Life 6-7-04 Liver Transplant Recipitant http://www.donatelife.net/ U S A for Organ Donation Thank You |
#3
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Using the wrong oil or not using the correct additive will result in the exact symptoms you described. If you change the fluid make sure to get all the old stuff out. Have seen cases where fluid had to be changed, then driven and then changed again before problem would go away.
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#4
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I put in 85/140 Walmart oil and got the gm posi lube don't know if it was that exact number you have posted above.
When I get back in town I will be sure to get the right stuff and change it out. You guys are good I thought I had something real bad happening. Thanks for your help How long after the change can I expect it to be quiet again? |
#5
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i had that on my lincoln. i pulled the axels, and all the posi plates, cleaned with lacquer thinner, then reversed all plates & installed. put in new oil and additive. no more problems
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DBANDGB |
#6
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Vote here or the GM posi lube.
Jim
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65 Catalina sedan. Allen Thomas Performance 495. KRE Heads at 310cfm ported by SD Performance, ProSystems Dominator carb on ported Victor intake, P-Dude custom grind hydraulic roller, MSD ignition, 3.50 Moser/Ford rear. F-Glass front bumper by son Rob, rear by the old man and joint effort for trunk lid. 3950# w/driver. Best of 9.5761/139 on 175 shot, 6.01 /114 in 1/8. |
#7
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“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
#8
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When you get the fluid changed and additive in, try to find an open parking lot and drive in a figure 8 pattern about a dozen or more times. That will scrape the clutch discs off some and hopefully force the proper lube in the clutch packs. It may take some time before all the noise goes away.
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#9
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Go with both the GM additive and the GM non-synthetic gear oil.
I had the same thing happen last time I did a rear. Forgot to provide my guy with the stuff. Was able to get away with just draining & replacing. Pontiac rears in particular seem to only tolerate this combination.
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"If you do everything you'll win" -LBJ 13 Smiles per Gallon: 66 Bonneville wagon 66 Bonneville 2d HT - In perpetual progress |
#10
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Quote:
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#11
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Before you go to all the work of changing new oil do like MGARBLIK wrote. Even with the best fluid you can buy it is necessary to do several figure 8's in both direction to get the fluid in between the clutch plates. This may fix your problem without replacing the fluid. Before I retired and was working as a mechanic this was a common fix. This may also happen after a long highway trip. You would notice it as you came off the exit ramp. Just do the fig. 8's to get rid of it.
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#12
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I had done the figure 8s quite a bit probably 100 times or more. I probably have less than 300 miles on this rear end since the install. I went from a 241 gear ratio to a 273 which feels a whole lot better. After I get this changed out I will report back. Does anyone know the correct weight gear oil? If the dealer does not have the right posi lube is there someplace else to buy this?
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#13
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There was a seller on E-bay who was a GM dealer selling the oil. I will have to check in the garage later to see which I bought from him. It was substantially less than they wanted at my local dealer.
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"If you do everything you'll win" -LBJ 13 Smiles per Gallon: 66 Bonneville wagon 66 Bonneville 2d HT - In perpetual progress |
#14
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Quote:
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The difference between inlaws and outlaws? Outlaws are wanted |
#15
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Alternative Lube
I've been using the CRC on the last few with no issues
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When I die, I want to go peacefully like my grandfather did, in his sleep. Not screaming like the passengers in his car. Last edited by Jeff Hamlin; 12-04-2016 at 07:48 AM. |
#16
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Yesterday I changed out the oil and sprayed some brake clean on everything but not a lot. I got the gm additive from the chevy dealer and was going to buy the gear oil as well but he said all they carried was synthetic. So went to buy the gear oil and I found some valvoline 85 /90 that said limited slip on the bottle. I didn't know they made different gear oil like that but I grabbed them.
Got everything installed and inspected and took it for a drive. It used to make a lilltle noise while backing up but I heard nothing. Took off to the corner and turned a sharp left and nothing. Went to the park and did my figure 8s about 15 of them and left before someone called the police. Went driving thru neighborhoods turning left or right at every corner I came to and no noise at any time. Wow I cant believe a gear oil change could make this much difference that quickly. I had this posi installed by someone else a few months ago. I did give him the gm additive and Walmart gear oil to install. I am willing to bet that he did not put the posi lube in causing the problem. Thanks everyone for your advise. Gotta run I am going to wash it put the top down and do about 50 miles on it. |
#17
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That's good news Bob.
Jim
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65 Catalina sedan. Allen Thomas Performance 495. KRE Heads at 310cfm ported by SD Performance, ProSystems Dominator carb on ported Victor intake, P-Dude custom grind hydraulic roller, MSD ignition, 3.50 Moser/Ford rear. F-Glass front bumper by son Rob, rear by the old man and joint effort for trunk lid. 3950# w/driver. Best of 9.5761/139 on 175 shot, 6.01 /114 in 1/8. |
#18
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Gotta say - Best subject line in a long time.
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#19
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Recently my 65 GP posi rearend started chunking on turns..even though it has a mere 5000 miles on a new 3:55 gear, installed with 80/90 gear oil and GM posi additive. Drained it out, added new oil and another bottle of posi additive, now $14 at local GM dealer. Seems to have cleared up again. Just thought it was odd it occurred after so few miles.
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Red\black 65 Grand Prix 467 E-head stroker, Viper T-56 6-speed, 4.10 spool |
#20
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Moisture is a big enemy. I know you put a ton of work into it, so I doubt that is your issue, but might be. Could be that more sitting & less driving condensation builds up inside.
__________________
"If you do everything you'll win" -LBJ 13 Smiles per Gallon: 66 Bonneville wagon 66 Bonneville 2d HT - In perpetual progress |
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