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Old 10-06-2008, 07:54 AM
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TJ rear axle options

This is a common topic so I thought I'd post some facts I've found out about the 3 main options.
Super 35, Rubicon 44 and Ford 8.8
Please correct as necessary.

Super 35
semi float c-clip shafts
Superior c-clip eliminator kit
This converts the Super35 to a 44jr.
That's right it removes the c-clips and bolts in the shafts. This is the same assembly design as the 44. With a 7.5" ring gear it's 1" small than a 44. Hence the name 44jr.
gear ratio options = 3.07, 3.55, 3.73, 4.10, 4.56, 4.88
Carrier break = 3.31 / 3.55
Locker choices
Detroit, OX, ARB, Auburn ECTED
Ring gear diameter = 7.5625"
Ring gear bolts = (8) 3/8 x 24 RH - NOTE: 7/16" used on later model TJs
Low pinion
Pinion shaft diameter = 1.406"
Pinion shaft spline count = 26
Axle shaft diameter = 1.30"
Axle shaft spline count = 30
Axle tube 2.50" x .250 wall
WMS-WMS = approximately 60.5"
5 on 4.5" bolt pattern
kits run from 700-1300
labor $250 - $500
Build time <6 hrs
bolt in upgrade

Rubicon/Sahara/Unlimited 44
(XJ44 is similar but leaf sprung)
semi float non c-clip style shafts
Standard rear axle used on all Rubicon model TJs
Gear ratio options, 3.08, 3.31, 3.54, 3.73, 4.10, 4.56, 4.88, 5.13, 5.38, 5.89
I'm not sure all ratios are available for the R44.
Detroit, ARB, OX, Spool, all lunchbox lockers, factory Tru-lok
Ring gear diameter = 8.5"
Ring gear bolts = (10) 7/16" x ??
Low pinion
Pinion shaft diameter = 1.376"
Pinion shaft spline count = 26
Axle shaft diameter = 1.30"
Axle shaft spline count = 30
Axle tube 2.50" x .250 wall
WMS-WMS = approximately 60.5"
5 on 4.5" bolt pattern
standard disk brakes on R44, drums on others
used axle run 700-1300
build time, <6hrs
bolt in swap

Ford Explorer 8.8
semi float c-clip style axle, leaf sprung
C-clip eliminators and Super88 kits available
gear ratios available
2.73, 3.08. 3.27, 3.31, 3.55, 3.73, 3.90, 4.10, 4.56, 4.88, 5.13, 5.71, 6.14
No carrier break
Lockers available,
Detroit, Spool, mini-spool, OX, ARB, Auburn ECTED, Eaton E-locker, All lunchbox lockers
O.D. of tubes: 3.250".
Tube thickness: .188, there is rumor of .250
(the larger tube gives 5/8" of lift and 5/8" lower clearance under tubes.)
Ring gear diameter: 8.800".
Ring gear bolts: 7/16" dia. (qty. 10).
Pinion diameter: 1.625
Pinion spline count 30
Axle shaft: 1.31
Axle spline count 31
Overall width 59.625" (the F8.8 is .950" narrower then a TJ Dana 35).
I've been told the c-clip eliminator kit increases the track 1"

complete axles can be had for $100 with a LSD and disk brakes.
This conversion will require welding and fabrication. Plus many additional parts.
Estimated build cost >$1000-$1200
build time >8 hrs

Ground clearance;
Measured on 35" tires on a concrete shop floor
axle - under tube - under diff
35 - 14 7/8 - 11 1/4
44 - 14 7/8 - 10 7/8
8.8 - 14 1/2 - 10 1/8

There are postings of axle shaft failure torque rating. I won't repost them here because it doesn't represent what were discussing accurately.
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Old 10-06-2008, 08:21 AM   #2
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good info, thanks

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Old 11-13-2014, 02:07 PM   #3
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Such an awesome post
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