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Jeep Wrangler YJ
YJ General Discussion
Differential gearing
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<blockquote data-quote="machoheadgames" data-source="post: 434557" data-attributes="member: 18789"><p>As Gilaguy said….weak is a relative term. The stock rear axle is generally safe for medium duty on 33’s with no locker in the axle. People call the axle a piece of shit but in reality, it performs as designed. Jeep designed it for 27” tires and I don’t know anyone that has broken a D35 on 27’s. </p><p></p><p>The rear axle can be beefed up to run 35’s and do tough wheeling. The kit to do that is a Super 35 which replaces the shafts with shafts that are slightly stronger than Dana 44 or Ford 8.8 shafts. It upgrades the splines from 27 spline to 30 spline and uses a 10-15% stronger alloy material. To upgrade the splines an aftermarket locker has to be used. You can choose from Eaton ELocker, Detroit automatic locker, ARB, or OX. </p><p></p><p>The reason people use Ford 8.8’s is they are plentiful and relatively easy to install. By the time you build one up it isn’t cheap unless you get a 4.10 axle and keep the 4.10s in there. Personally I will never end up needing a 4.10 setup so an 8.8 really makes no sense to me. The 8.8 also has a larger diff housing so it hangs lower and has less ground clearance than a D44 or D35.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 434557, member: 18789"] As Gilaguy said….weak is a relative term. The stock rear axle is generally safe for medium duty on 33’s with no locker in the axle. People call the axle a piece of shit but in reality, it performs as designed. Jeep designed it for 27” tires and I don’t know anyone that has broken a D35 on 27’s. The rear axle can be beefed up to run 35’s and do tough wheeling. The kit to do that is a Super 35 which replaces the shafts with shafts that are slightly stronger than Dana 44 or Ford 8.8 shafts. It upgrades the splines from 27 spline to 30 spline and uses a 10-15% stronger alloy material. To upgrade the splines an aftermarket locker has to be used. You can choose from Eaton ELocker, Detroit automatic locker, ARB, or OX. The reason people use Ford 8.8’s is they are plentiful and relatively easy to install. By the time you build one up it isn’t cheap unless you get a 4.10 axle and keep the 4.10s in there. Personally I will never end up needing a 4.10 setup so an 8.8 really makes no sense to me. The 8.8 also has a larger diff housing so it hangs lower and has less ground clearance than a D44 or D35. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Differential gearing
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