Crush sleeve 1976 Caddy Fleetwood 8.78

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Old School
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Crush sleeve 1976 Caddy Fleetwood 8.78

Post by Old School » Wed Feb 28, 2018 10:56 am

Does anybody know a source to get a new crush sleeve? My son needs one and the local parts houses say they are not available. They have them for the smaller differential but not for the 8.78. I hope I have the differential size correct (8.78) just going on what he told me. I am not experienced in Caddys. Thanks for any help.

Billy

tresi
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Re: Crush sleeve 1976 Caddy Fleetwood 8.78

Post by tresi » Wed Feb 28, 2018 1:49 pm

Try ringpinion.com they might have it

Keith Morganstein
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Re: Crush sleeve 1976 Caddy Fleetwood 8.78

Post by Keith Morganstein » Wed Feb 28, 2018 6:33 pm

Old School wrote:
Wed Feb 28, 2018 10:56 am
Does anybody know a source to get a new crush sleeve? My son needs one and the local parts houses say they are not available. They have them for the smaller differential but not for the 8.78. I hope I have the differential size correct (8.78) just going on what he told me. I am not experienced in Caddys. Thanks for any help.

Billy
If you can't find one, there's options. If the current sleeve makes too much preload, add a shim(s). If there is not enough preload and the old sleeve won't crush more, it can be trimmed and shimmed.

You can also cut a non crush sleeve from tube. Then shim that.
Automotive Machining, cylinder head rebuilding, engine building. Can't seem to quit #-o

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Re: Crush sleeve 1976 Caddy Fleetwood 8.78

Post by peejay » Wed Feb 28, 2018 8:23 pm

I have, in a pinch, hammered a used sleeve over a beefy dowel to spread it open again so it can be re-crushed. I have a chunk of strut shaft that I clamp in a vise. (Strut shafts make GREAT punches and chisels, too! High quality steel and basically free)

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Re: Crush sleeve 1976 Caddy Fleetwood 8.78

Post by Old School » Wed Feb 28, 2018 11:45 pm

Thanks for the suggestions but the problem is the sleeve is split open. I have put old sleeves over a round bar and hammered them longer but this one is not in the best condition for that.

If I knew what the correct length was I thought I might mill a 12 bolt sleeve to size if it would fit over the pinion. However, my son is young (35) and doesn't have time to wait to get the correct part or machine one to fit. He also lives about 3 hours from me. He has informed me he welded the old one and hammered it longer. Said it tightened with resistance and will be fine. Oh well, youth and enthusiasm wins over age and experience every time.

If anyone knows where I can get a new one I will still buy it. Age and experience tells me that half way fixes might not last for long.

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Re: Crush sleeve 1976 Caddy Fleetwood 8.78

Post by Baprace » Thu Mar 01, 2018 1:30 am

peejay wrote:
Wed Feb 28, 2018 8:23 pm
I have, in a pinch, hammered a used sleeve over a beefy dowel to spread it open again so it can be re-crushed. I have a chunk of strut shaft that I clamp in a vise. (Strut shafts make GREAT punches and chisels, too! High quality steel and basically free)

I have done the hammer on a shaft to make the sleeve longer many times with great results. I also use locktite on the pinion threads when the sleeve is just barely long enough.

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