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Old 03-27-2002, 12:21 PM
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Post Differential blues (need some suggestions)

Need some imput on possible cause. A friend overhauled a 12 bolt to put in 71 monte carlo , told me he put new bearing kit as well as new ring & pinion.RICHMOND 4.11 gears.Every thing is in specs.pinion was 15" lbs,brg caps 65ft, gear rng 100ft, backlash .007, pattern,right on, yoke true.All parts & specs right on.
PROBLEMS ENCOUNTERED DIFF high pitch wine on coast decel only,pinion seal slings oil out only when driving. he told me he put 75-90 lube in it, I told him the oil wt sounded wrong for the gears, he cked papers with gear set and it said to use 75-140 lube. I could only come up with a few ideas, besides the gear lube wrong wt, and poss. vent in housing could be plugged. NEED SOME HELP!!! has anyone else ever seen this happen and could it have poss overheated gears ruining pin seal & his new gears,brgs etc? he said he took it for a drive around the block and saw it leaking when he got back , est he lost 1/2 of fluid.Said he cked pion seal ok not damaged


NOVA JEFF

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Old 03-27-2002, 01:13 PM
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Does your unit use a crush washer on the pinion?
if you go to much and reset you must replace crush washer, how about axle bearings(outside) Is your unit posi, limited slip?Sounds like pinion is moving back and forth, doesn't take much.What gear ratio was inside your unit before going to
4:11's,Also what did you torque the pinion nut to
ft.lbs.did you use persion blue to check your mesh pattern
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Old 03-27-2002, 04:56 PM
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Pontiac man
I cked with my friend, he said the housing was from a chevelle,he replaced the orig carrier with a GM fact 1970 Posi 4 series c-clip style so he could use the RMD 4.11 gears,& c/axles He did have new crush sleve, said he colapsed sleve till he had 25 inch lbs drag on pinion,after unit was all together used torque wrench on pinion nut took 50 ft lbs of torque to turn the unit over complete assy. He said he used some of his white lead compound to ck tooth pattern. He cked the pattern with E-brake half applied, loaded. We are trying to figureout if the problems encountered in orig post gear noise coast,decell and pinion seal slinging fluid only when accellerating is because 75-90/w posi add. is problem when RMD gear recommend 75-140 gear oil for these gears,if diff vent not open press build up, if gears not machined correct coast side # on pin & ring set match. Any ideas or input suggestions appreciated.



NOVA JEFF
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Old 03-27-2002, 05:39 PM
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Sounds like the bearing cups were not correctly seated and the torque of driving has loosened the pinion. Try retorquing the pinion nut on the car and see if it is still in spec. I would take it apart again if it was loose as the pinion will have to be reset depending on which cup was not seated.
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Old 03-29-2002, 06:08 AM
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4 JAWCHUCK
Thanks for suggestion will re-ck and see if it did loosen some ,Do think that their was any poss. that because he put 75-90 lube in instead of the 75-140 listed with gear instuctions could caused any of the probems, poss over heating the new bearings & gears, when he test ran it?


NOVA JEFF
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Old 03-29-2002, 08:08 AM
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I don't think so Nova.
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Old 03-31-2002, 03:45 AM
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Thanks for the input guys will re-ck & go from there.


NOVA JEFF
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Old 04-11-2002, 12:10 AM
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Did you figure out your diff problems? Gear oil would not be it. Have seen oil come out through splines of yoke, not common. 50in.lbs is too much for ring and pinion, maybe ok if axles installed. Tricks I have learned from doing lots of 12 bolts. 1- no matter what gearset you use, the pinion shim from the housing you use will be very close. If you had to change the shim dimension more than .005" from what was original then you have a problem. Could be a poor quality gear set. 2- check tooth contact on drive and coast, they should both be in the same area of the tooth, ie both heel heavy, toe heavy, or centered. Sounds like your pinion bearings are too tight causing excessive heat and your pattern is a little off.
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