Early/Late 8.25 carrier interchange?
#685694
05/01/10 06:14 PM
05/01/10 06:14 PM
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Joined: Jan 2003
Posts: 26,561
Santa Rosa, NOR*CAL.
Just Cameron
OP
Too Many Posts
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OP
Too Many Posts
Joined: Jan 2003
Posts: 26,561
Santa Rosa, NOR*CAL.
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Hey all. Posting from Pick & Pull...Gotta love the laptop and wi-fi.  I was looking for Dakota manual bellhousings, but I found a 6 lug '94 Dakota with sure grip 8.25 rear. I know '97 and later units had some differences. The 8.25 in my Duster is an earlier ('75) open diff A-body unit. 1) Will the carriers interchange from my '75 to a '94. 2)Is the factory unit rebuildable? Thanks.
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Re: Early/Late 8.25 carrier interchange?
[Re: Just Cameron]
#685695
05/01/10 06:28 PM
05/01/10 06:28 PM
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Joined: Apr 2007
Posts: 2,327
Glendale, AZ
69L78Nova
Banned. Forever.
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Banned. Forever.
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
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As far as I know, the axle spline count changed in 97. Should work in your Duster
1969 Nova
454/M21/3.31
Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD
5.0/4R70W/3.55
(Daily driver)
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Re: Early/Late 8.25 carrier interchange?
[Re: 69L78Nova]
#685696
05/02/10 01:03 AM
05/02/10 01:03 AM
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Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan
I Live Here
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I Live Here
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Oakdale CT
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Quote:
As far as I know, the axle spline count changed in 97. Should work in your Duster
1) The later ones from Ma Mopar are junk! We changed them like mad at the dealership.
2) Yes the center will interchange up to the point the splines change. I have an Auburn diff from a Jeep Liberty in my 74 Duster =) $78 off Ebay.
The only thing you need to be aware of is to use the diff bearings correct for your housing. Mopar changed the outer diameter of the diff bearings around '76
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Re: Early/Late 8.25 carrier interchange?
[Re: Just Cameron]
#685697
05/02/10 01:20 AM
05/02/10 01:20 AM
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Joined: Jan 2004
Posts: 5,476
340dart4spd
Parts Problem
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Parts Problem
Joined: Jan 2004
Posts: 5,476
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Quote:
Hey all. Posting from Pick & Pull...Gotta love the laptop and wi-fi.
I was looking for Dakota manual bellhousings, but I found a 6 lug '94 Dakota with sure grip 8.25 rear. I know '97 and later units had some differences.
The 8.25 in my Duster is an earlier ('75) open diff A-body unit.
1) Will the carriers interchange from my '75 to a '94.
2)Is the factory unit rebuildable?
Thanks.
what gear ratio is your current unit?
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Re: Early/Late 8.25 carrier interchange?
[Re: Kern Dog]
#685699
05/02/10 01:48 AM
05/02/10 01:48 AM
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Joined: Jan 2004
Posts: 5,476
340dart4spd
Parts Problem
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Parts Problem
Joined: Jan 2004
Posts: 5,476
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Quote:
I have done this install twice... Cool mod, huh? Saves cash. First time I found an Auburn Diff. Second time I lucked out and came across a Power lock style with clutches and springs. I had it rebuilt and installed in a 8 1/4 axle from a 74 Duster. I have it in my 67 Dart. 3.55 gears and sure grip for about $225. Can I get a HELL YEAH!?
bet you used a spacer and longer bolts
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Re: Early/Late 8.25 carrier interchange?
[Re: Kern Dog]
#685701
05/02/10 02:23 AM
05/02/10 02:23 AM
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Joined: Jan 2004
Posts: 5,476
340dart4spd
Parts Problem
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Parts Problem
Joined: Jan 2004
Posts: 5,476
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Quote:
I don't understand what you wrote.
I recall having trouble trying to get a set of later 3:55 gears to work with early 8 1/4 suregrip... there were major clearance issues...In order for it to work I had to buy much newer suregrip carrier..
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Re: Early/Late 8.25 carrier interchange?
[Re: 340dart4spd ]
#685702
05/02/10 03:52 AM
05/02/10 03:52 AM
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Joined: Feb 2010
Posts: 18,493
Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Oh....I thought you were making a joke, as if I tried to put 2 differentials in the same rear end at the same time... LONGER bolts! heh heh heh, I get it NOW ! Wait, that wasn't a joke? I guess I look like an idiot now. The Sure Grip diffs I pulled came from the square body Dakota trucks, whatever year those were. Like I wrote, the first unit was cone type and non rebuildable. I got lucky on the second one. They both had 3.55 gears, the same as what I had. I had a local axle guy do the work, and the diff cover was bolted on with silicone RTV in place of a gasket, so I never looked to see if there was a spacer in there. I doubt it, since the ratios were the same. 
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Re: Early/Late 8.25 carrier interchange?
[Re: Kern Dog]
#685703
05/02/10 06:46 AM
05/02/10 06:46 AM
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Joined: Jan 2004
Posts: 5,476
340dart4spd
Parts Problem
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Parts Problem
Joined: Jan 2004
Posts: 5,476
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Quote:
Oh....I thought you were making a joke, as if I tried to put 2 differentials in the same rear end at the same time... LONGER bolts! heh heh heh, I get it NOW ! Wait, that wasn't a joke? I guess I look like an idiot now.
The Sure Grip diffs I pulled came from the square body Dakota trucks, whatever year those were. Like I wrote, the first unit was cone type and non rebuildable. I got lucky on the second one. They both had 3.55 gears, the same as what I had. I had a local axle guy do the work, and the diff cover was bolted on with silicone RTV in place of a gasket, so I never looked to see if there was a spacer in there. I doubt it, since the ratios were the same.
you can rebuild a cone sorta..you can machine it to get a little more life out of it..but ...
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Re: Early/Late 8.25 carrier interchange?
[Re: 340dart4spd ]
#685704
05/02/10 07:23 AM
05/02/10 07:23 AM
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Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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Quote:
I recall having trouble trying to get a set of later 3:55 gears to work with early 8 1/4 suregrip... there were major clearance issues...In order for it to work I had to buy much newer suregrip carrier..
I can't help you there- The Auburn diff I have is aftermarket of course, and the 3.55's were from a Jeep Cherokee also off Ebay ($32 shipped)
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Re: Early/Late 8.25 carrier interchange?
[Re: Kern Dog]
#685705
05/02/10 07:27 AM
05/02/10 07:27 AM
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Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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Quote:
I had a local axle guy do the work, and the diff cover was bolted on with silicone RTV in place of a gasket, so I never looked to see if there was a spacer in there. I doubt it, since the ratios were the same.
I had a spacer when running 4.56's with my Dana, never heard of one for a 8.25. Far as I knew only the 2.45 and maybe 2.76 had the oddball carrier.
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Re: Early/Late 8.25 carrier interchange?
[Re: gdonovan]
#685706
05/02/10 07:44 AM
05/02/10 07:44 AM
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Joined: Jan 2004
Posts: 5,476
340dart4spd
Parts Problem
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Parts Problem
Joined: Jan 2004
Posts: 5,476
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Quote:
Quote:
I had a local axle guy do the work, and the diff cover was bolted on with silicone RTV in place of a gasket, so I never looked to see if there was a spacer in there. I doubt it, since the ratios were the same.
I had a spacer when running 4.56's with my Dana, never heard of one for a 8.25. Far as I knew only the 2.45 and maybe 2.76 had the oddball carrier.
yea...
I don't think you can even find a spacer..but here talk about it could work.. would be easy enough to do..but heck what waste your time on a 8 1/4
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Re: Early/Late 8.25 carrier interchange?
[Re: 340dart4spd ]
#685707
05/02/10 08:23 AM
05/02/10 08:23 AM
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Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan
I Live Here
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I Live Here
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Posts: 10,847
Oakdale CT
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Quote:
I don't think you can even find a spacer..but here talk about it could work.. would be easy enough to do..but heck what waste your time on a 8 1/4
Well it all depends on what you are going to do with it...
In my case the car will have nothing stronger than a stout 318 so the investment of $240 (ring and pinion, bearings & "posi") is well spent considering what you would drop for an upgrade to a big bolt pattern 8.75 with 3.55 shure grip.
I'm fairly sure I saved at least $500-$750 not moving over to a 8.75.
More funds that can be spent on that 5.2 Magnum motor upgrade ;-)
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Re: Early/Late 8.25 carrier interchange?
[Re: Just Cameron]
#685710
05/04/10 05:18 AM
05/04/10 05:18 AM
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Joined: Jun 2008
Posts: 10,847
Oakdale CT
gdonovan
I Live Here
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I Live Here
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Posts: 10,847
Oakdale CT
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Quote:
Oh, one other thing, the new rear has a sensor on it.
How does that sensor work? Does it know the rear brakes are locked when the diff abruptly tries to quit turning?
Something like that.
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