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1976 Coupe Deville rear end


hankk17

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Hi All. I've got a recently acquired 76 coupe deville that is in fantastic shape except for a few small issues here and there. It's only got 64k on it and very little rust.

My question is this - I've been hearing a low but perceptible grinding coming from the rear end. Feaering the worst, I took it to a local shop and had them check the differential oil and sure enough it was black sludge with metal filings mixed in. The mechanic didn't seem overly concerned about the filings so for now I had them clean out the gunk and put new oil in the differential. I have yet to pick it up so I'm not sure if the grinding is gone or not...but it got me to wondering if it was indeed a major problem, how would I even go about rebuilding or replacing it? Do any of you know a good supplier for rear end parts of this nature?

I've already done some searching on my own but can't find any OEM suppliers that will supply the gears themselves - only the bearings. I've found other places that will sell kits but I need to know gear ratios and other measurements I'm not sure I know accurately enough to justify dropping $1-2K on parts with.

thx!

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As far as the rear end is concerned, you need to determine if the issue is the wheel bearings or in the differential itself. I can't remember if those differentials had the welded housing or if there was a removable cover. If the cover is removable, you could check the condition of the gears for abnormal wear patterns.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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If you need parts, I did a search at www.rockauto.com and they have parts for your differential

Mike

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A grinding noise coming from the rear axle in a low-mileage older car is most often wheel bearings.

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Back in the day...you would never rebuild a rear end. Repair a axle bearing...sure. But get into a gear problem? No. Cheaper and faster to replace the rear end.

Of course, thats back in the day when rear ends were a dime a dozen used.

Could be posi noises, wrong fluid. Or- could simply be normal rear end sounds. People forget how noisy rear ends were before front wheel drive.

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If you need parts, I did a search at www.rockauto.com and they have parts for your differential

Mike

Thanks Mike - I already checked them out and they and most of the other parts sites I've seen only stock bearings and races and a few seals. If I need to replace the actual gears inside, I don't know where to look... that's really the crux of my question I suppose.

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Back in the day...you would never rebuild a rear end. Repair a axle bearing...sure. But get into a gear problem? No. Cheaper and faster to replace the rear end.

Of course, thats back in the day when rear ends were a dime a dozen used.

Could be posi noises, wrong fluid. Or- could simply be normal rear end sounds. People forget how noisy rear ends were before front wheel drive.

Hey Logan! you and I have traded messages in the past on another caddy forum about a 99 eldo I had. I've since gotten rid of that and now this is my baby lol.

but yeah, I remember those days.. rebuilding a rear end was definitely unheard of. Guess I'll check around some of my local boneyards :-)

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