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Old 06-12-2011, 05:29 PM
64Joker's Avatar
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Oil Leak - Rearend - 1964 Impala

I noticed a small oil drip leak coming out of the rearend (see attached pics).
Leak appears to be near the universal area (yellow arrow in pic).
I also noticed oil being shot upwards towards the bottom of the body/frame.
I've never worked on a rearend problem, I just need some direction and or resources. Thanks...

Make: Chevrolet
Model: Impala SS
Year: 1964
Rear Axle: Stock (10 bolt)
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Old 06-12-2011, 05:39 PM
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Looks to me like you need to install a new pinion seal, but you will also need to check and see just how much slop you have in that area also while you are there JMO you might get lucky and just a new seal will fix it.
But that's what is leaking is the pinion seal but if you have to much wear it will eventually start leaking again. IMHO. But if everything is good just the seal should do it. Back lash is the slop i am reffering to.



Cole

Last edited by eloc431962; 06-12-2011 at 05:48 PM.
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Old 06-12-2011, 08:15 PM
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Backlash has no bearing[no pun intended] on whether or not a pinion seal leaks. A bad pinion bearing or bearings will cause a leak, that being said, I'd put a seal in it & give it a go!!

dave
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Old 06-12-2011, 08:23 PM
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The bearing going out will cause the pinion shaft to wobble there for taking out the seal, And i alway's thought that if you had alot of back lash / slop when you drop it in gear that it could and would eventually also take out the seal.IMHO



Cole
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Old 06-13-2011, 08:10 AM
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G'day 64joker,

I too have a 64 Impala. Those 8.2" 10 bolts leak......eventually. These rear ends always seem to start leaking from about 50k miles onwards. Road grime and surface rust seem to finf there way in behind the flange and start chewing things up. Coupled with blocked vents in the housing, the diff builds up pressure inside and starts pushing the oil out at the weakest link.

The pinion drive flange also known as a companion flange and pinion seal can be changed relarively easily if you know what you are doing. However like most things, until it's removed you won't know what lurks beneath, i.e. grooves etc. in the pinion flange running surface. Like a harmonic balancer with grooves in the running surface, a new seal won't fix it.

So in my humble opinion, if it's a high mileage diff, (100k plus) then I would have the centre pulled and checked out by your friendly "diff doctor", readjusted and new seal installed along with a new pinion drive flange, or suitably repaired used flange.

This work can be done yourself if you want to learn about rearends. You will need a repair manual and fabricate some special tools, plus access to a torque wrench up to 350 ft lbs.....yes you read right. That pinion bolt is seriously tight and you need some Long-long extension bars to get the job done.

The other alternative is checkout the swap meets and buy good used diff centres when they turn up. You just might find a unit already repaired and ready to go !.
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Old 06-13-2011, 08:23 AM
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Leaking seals

The rear end pinion seal and the seal on the drive shaft yoke in the transmission have a nasty habit of leaking around the ouside of the seal where it seats in the housing. Before you install either one of those seals, clean the groove in the housing where the seal seats and apply a liberal coating of Permatex High-Tack sealer before you install the seal.
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