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TH400 question
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<blockquote data-quote="junkyard jim" data-source="post: 852746" data-attributes="member: 16140"><p>A flush is what is really needed to clean it out. Are you sure it's a QT? (NP219 since it's behind a 727. Used factory '80 till early '82) The shifter has high, high lock (aka Edrive on some), neutral and low lock. NP208 (avail option on low buck models '80 to '89 and all std trans FSJs '80 up) has 2hi, 4 hi lock, neutral and 4 low lock. With locking hubs you can also get 2 low with the hubs undone.</p><p> If it's Selectrac, and pre '86 then it probably has the stupid vacuum front axle and either NP229 (available '82 to '91 except '86) or NP228 ('86ish) tcase which are the same except the NP229 has a viscous coupler (like a posi front and back in 4 hi) and the NP228 doesn't (it's like an open diff in 4 high) The NP219, 228, 229, 119, 128, 129 are all the same length (latter 3 were used in AMC Eagles with no low range) but the NP208 is shorter on the back (because it's a solid drive unit so the extra space wasn't needed to be wasted)</p><p></p><p></p><p>If you can find a LH drop Dodge NP205 with 23 spline (check the input depth. There is deep and shallow) then you don't need to change the trans but you will have to do some body/floor and driveshaft mods to make it fit. May require gastank mods for clearance too.</p><p></p><p>Depending on the tcase, a TH400 swap could require gas tank swapping for driveshaft/tcase clearance.</p><p> I suggest better trans mount when you work on it (I switched all my mounts to Energy Suspension since they make one for the 6 cyl as well)</p><p></p><p>I honestly don't think the NP231 (actually, NV231 since it would have to be '91 up for 23 spline unless you find one on a 4 cyl XJ with 3 speed auto) will stand up to the loads an FSJ will put on it. I used to have a link to New Venture's website with all the tcase's strengths and ratings posted (my friend was an engineer on the NV241 4:1 tcase for the Rubicon and he posted those up)</p></blockquote><p></p>
[QUOTE="junkyard jim, post: 852746, member: 16140"] A flush is what is really needed to clean it out. Are you sure it's a QT? (NP219 since it's behind a 727. Used factory '80 till early '82) The shifter has high, high lock (aka Edrive on some), neutral and low lock. NP208 (avail option on low buck models '80 to '89 and all std trans FSJs '80 up) has 2hi, 4 hi lock, neutral and 4 low lock. With locking hubs you can also get 2 low with the hubs undone. If it's Selectrac, and pre '86 then it probably has the stupid vacuum front axle and either NP229 (available '82 to '91 except '86) or NP228 ('86ish) tcase which are the same except the NP229 has a viscous coupler (like a posi front and back in 4 hi) and the NP228 doesn't (it's like an open diff in 4 high) The NP219, 228, 229, 119, 128, 129 are all the same length (latter 3 were used in AMC Eagles with no low range) but the NP208 is shorter on the back (because it's a solid drive unit so the extra space wasn't needed to be wasted) If you can find a LH drop Dodge NP205 with 23 spline (check the input depth. There is deep and shallow) then you don't need to change the trans but you will have to do some body/floor and driveshaft mods to make it fit. May require gastank mods for clearance too. Depending on the tcase, a TH400 swap could require gas tank swapping for driveshaft/tcase clearance. I suggest better trans mount when you work on it (I switched all my mounts to Energy Suspension since they make one for the 6 cyl as well) I honestly don't think the NP231 (actually, NV231 since it would have to be '91 up for 23 spline unless you find one on a 4 cyl XJ with 3 speed auto) will stand up to the loads an FSJ will put on it. I used to have a link to New Venture's website with all the tcase's strengths and ratings posted (my friend was an engineer on the NV241 4:1 tcase for the Rubicon and he posted those up) [/QUOTE]
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