The 8 1/4 thread

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Posi is a curse here track lok or sure grip is what it is called in a mopar. If the doner rear has disk you can actually use them on a 8 1/4 with a little modification.
 
2.45 is the cut off you should be great. If it has a tone ring take it off before installing it.
 
I did not remove the tone ring on mine. Some people had to because it hit but mine did not hit so I left it.
 
1970-dart said:
I did not remove the tone ring on mine. Some people had to because it hit but mine did not hit so I left it.
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ok, I took my donor rear apart it has a 3.55 ring and pinion but the carrier looks like an open with spider gears, but both wheels turn same direction so is this considered a trak loc,and if i understand this 3.55 carrier should bolt right in.
 
Look at the side spider gears and you should see clutches there. If not it is open. Did the doner have any use additive tags on it?
 
Here

traclok18_both_1024.jpg
 
Help please.
I have a 1972, 8 1/4 rear with 2.76 gears. It is an open rear and I would like to change it to a posi. What do I look for, I have the 3.55 gears for it in the garage. Thanks for the 8 1/4 thread I am sure lots of A-body owners can't afford an 8 3/4.
 
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Dana 35 trak lock, usually can find them in Cherokees. Look for the use friction modifier tags on them usually they are open unless it is true 4wd. If it has rear disks you can score them also.
 

  • Dana 35 Specs
  • Ring Gear measures 7.5 inches (191 mm)
  • OEM Inner axle shaft spline count: 27
  • Pinion shaft splines: 26
  • Rear axle ratios range from 2.73:1 to 4.88:1
    • TTB axle ratios range from 3.27:1 to 4.88:1
    • IFS axle ratios range from 3.08:1 to 4.88:1
  • Carrier break: 2.72:1 - 3.31:1 and 3.55 - 4.88:1
  • Axle Shaft diameter
    • Rear 1.09 inches (28 mm) (30 Spline)

  • Compatible with Models
    Front Axle

    • Dodge
    • 1997-2000 Dakota
    • 1997-2000 Durango

    • Ford
    • 1990-1997 Explorer
    • 1990-1997 Ranger
    Rear Axle

    • Jeep
    • 1984-1997 Jeep Wagoneer
    • 1984-2001 Jeep Cherokee
    • 1993-2004 Jeep Grand

    • Cherokee
    • 1986-1992 Jeep Comanche
    • 1987-Present Jeep Wrangler
    • 2001-2007 Jeep Liberty
 
Jeep 8.25 will work if they are 1995 and older and most jeep rears are 3.07 ratio if out of a 6 cylinder (4.0) manual transmission or 3.55 ratio 6 cylinder with auto transmission. The 4cylinder jeeps had 4.10 with manual transmission and autos have 4.56 (very rare)
And some came with 3.73 with a economy package. This info is for Cherokee jeeps only. 8.25 didn't come in grand cherokees

Also Docotor Diff sells the larger axles shafts with 29 splines instead of the 27 splines in A body length so you can use the later jeep Trac Loc's. The axles he sells are better material and much larger shaft than stock ones.
 
Thanks great info. I really need to condense the info here for sure.
 
Also I don't know if this is exactly relevant, but grand cherokees up to 1998 had a Dana 35 rear with disk brakes the disk brakes swap is common/simple swap for regular Cherokee's with 8.25 and abodies as well. Regular Cherokee's are drum only. Jeep liberty's also came with 8.25 rears but they are really different but you can use the disk brakes off them as well. They are (5x4.5) bolt pattern

Grand Cherokee's from 1999-2004 disk brakes will not work and are of a different bolt pattern (5x5)

Also 8.25 abody Canadian rear ends seem to have came with 11" drums. These larger drums can be found on larger cars in the USA with 8.25 rears
 
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Cool thread. I did this conversion years ago after I sent the spider gears flying in my old 7 1/4.

I did not know there was a difference in the housing types. I guess I had some dumb luck when ordering parts as the set of 3.55 gears and sure grip fit just fine in my 8 1/4. I was not sure what car it came out of as some guy gave it to me. It has 11 x 2in drums on it and it was impossible to find replacement parts. Couldn't keep tires on the car afterward....

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Thanks to Halifax for the direction to come look at this thread. I have read the first page and then some. I just want to make sure I understand my rear axle. Here are the pics. I was told it came out of a 74. I did not count teeth but the pinion made 2.75 or so rotations for every one rotation of the ring.

Is this the offset rear end? That will help me get going.

8.25.jpg


8.25 side.jpg
 
It does look like it in the pic could be the angle though. take the cover off and look in at the pinion see if it is in the center.
 
Go to post one there are pictures of both styles. I would love to get all the part numbers together of both housings.
 
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