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8.75 Rebuild
#952674
03/17/11 04:35 PM
03/17/11 04:35 PM
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Joined: Sep 2004
Posts: 833
Marietta, GA
Joatha
OP
super stock
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OP
super stock
Joined: Sep 2004
Posts: 833
Marietta, GA
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I'm not well-versed in the (at this point is) mystical art of rebuilding an 8.75 pumpkin (a 742 would be preferable). At one point I was just going to go ahead and buy a 742 already done. I may still do that. But, budget realities are starting to hit home and I'm trying to figure out if I can do it myself and save some $$$$. I haven't found a lot of info on exactly how to rebuild a 742 on the net.
Disassembly and assembly don't look very difficult to me and I suspect that the hard part is getting everything set correctly with the shims. True?
What out of the ordinary tools would I need? And, how much can I save by doing it myself vs buying one already done? Seems like if I take my time and shop smart, I may be able to get it done a little cheaper.
1966 Barracuda
1968 Barracuda convertible
1930 Ford Model A (soon to be hemi equipped)
2006 Dodge 3500 4X4 CTD Quad Cab
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Re: 8.75 Rebuild
[Re: Joatha]
#952675
03/17/11 04:53 PM
03/17/11 04:53 PM
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Joined: Sep 2004
Posts: 833
Marietta, GA
Joatha
OP
super stock
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OP
super stock
Joined: Sep 2004
Posts: 833
Marietta, GA
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Just to add more info...
I was thinking of buying a 742 case with open gears and then adding a locker (brand TBD) to make it a sure-grip and 3.55 or 3.73 gears. Naturally, I'd get new pinion gears and shims (etc).
1966 Barracuda
1968 Barracuda convertible
1930 Ford Model A (soon to be hemi equipped)
2006 Dodge 3500 4X4 CTD Quad Cab
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Re: 8.75 Rebuild
[Re: Joatha]
#952676
03/17/11 07:17 PM
03/17/11 07:17 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I was wondering this myself maybe w the video from Randy's
live every 24 hour block of time like it's your last day on earth
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Re: 8.75 Rebuild
[Re: Joatha]
#952679
03/17/11 11:01 PM
03/17/11 11:01 PM
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Joined: Sep 2004
Posts: 833
Marietta, GA
Joatha
OP
super stock
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OP
super stock
Joined: Sep 2004
Posts: 833
Marietta, GA
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If I found a 742 case with the bearing adjusters and end caps, all I should need to buy is a locker, locker bearings, ring and pinion, pinion bearings, and the yoke (plus shims as required). Plus assorted nuts, bolts, and washers.
Correct?
1966 Barracuda
1968 Barracuda convertible
1930 Ford Model A (soon to be hemi equipped)
2006 Dodge 3500 4X4 CTD Quad Cab
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Re: 8.75 Rebuild
[Re: Joatha]
#952681
03/18/11 12:24 AM
03/18/11 12:24 AM
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Joined: Nov 2004
Posts: 892
USA
krw71ragtop
super stock
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super stock
Joined: Nov 2004
Posts: 892
USA
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Quote:
I'm not well-versed in the (at this point is) mystical art of rebuilding an 8.75 pumpkin (a 742 would be preferable). At one point I was just going to go ahead and buy a 742 already done. I may still do that. But, budget realities are starting to hit home and I'm trying to figure out if I can do it myself and save some $$$$. I haven't found a lot of info on exactly how to rebuild a 742 on the net.
Disassembly and assembly don't look very difficult to me and I suspect that the hard part is getting everything set correctly with the shims. True?
What out of the ordinary tools would I need? And, how much can I save by doing it myself vs buying one already done? Seems like if I take my time and shop smart, I may be able to get it done a little cheaper.
Look in the "trans differential" for sale section. Might be able to find a core. Then contact doctordiff for any parts you need to rebuild it.  He's a member here. Even if you find one already rebuilt I would take it apart and check everything out. I purchased a 489 case with 4.10 gears 2 years ago for $500 plus a core, at the Chrysler Winter Classic in Ohio, that was supposed too be all new. Long story short it didn't last 10 miles. 
Had a friend help me rebuild a 742 case. The clutch pack was good so saved some money there. You might get lucky and have good bearings too. Ordered the ring and pinion and shims from doctordiff. You need the tool to take the bearing off the pinion gear and a press to put it together. You might have to take it apart more than once or twice.  We used the permatex anti seize #765-1674 to check the pattern. Just make sure your lash and pinion depth is correct and everything is torqued.
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