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Registered User
Join Date: Mar 2005
Location: In my own world
Posts: 6,789
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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
**NOW AVAILABLE**
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 = 3.55, 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
Cost
kits run from 700-1300
labor $250 - $500
Build time <6 hrs
bolt in upgrade
Rubicon/Sahara/Unlimited 44
(XJ/MJ 44 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.
Lockers,
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
Cost,
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.)
(Wheelin98TJ hates the math error here. The interweb has 5/8” as the accepted value of lift. Even when it’s only 3/8”)
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"
Cost,
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.
Add on;
Toyota Tacoma 2WD, non Pre-Runner 1995-2001
I'm still gathering details.
8" ring gear
Third member design
ARB, Detroit, Toyota E-Locker, Spool
Lot's of gear ratios
5x4.5 bolt pattern
no crommo shafts available I can find.
Several aftermarket housings available.
A Grand Cherokee or ZJ Dana 44a is not an option for installation in a TJ
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Dana 44 or 8.8?
