Sushi Posted October 20, 2007 Share Posted October 20, 2007 Is it possible to change the 3.7 gears in the front diff of an FT4WD tranny with the 3.9 from a PT4WD? Or, is the center diff unit able to attach/install in a PT4WD case (not likely, but just had to ask)? Also, are the rear axles the same for a PT and FT 4WD setup or is there a different spline count as on the front? Link to comment Share on other sites More sharing options...
Numbchux Posted October 20, 2007 Share Posted October 20, 2007 the driven shaft and pinion shaft are one piece on a PT4WD trans, and 2 pieces (one inside the other) on a FT4WD one. so no, not interchangeable. XT6s, however, got a 3.9:1 FT4WD trannies. you could use the pinion gear out of one of them (or the whole trans...). rear axles are identical either way. so an EA82 3.7:1 rear diff is a direct swap with a 3.9:1 one. Link to comment Share on other sites More sharing options...
Sushi Posted October 20, 2007 Author Share Posted October 20, 2007 Interesting... Does this xt6 tranny use the same front driveshafts as a 3.7 ft4wd or a 3.9 pt4wd? Did they come with center diff lock? Just to confirm, this will mate up with a ea-82 4cyl? Link to comment Share on other sites More sharing options...
idosubaru Posted October 20, 2007 Share Posted October 20, 2007 XT6 trans will bolt right up to an EA82 - completely interchangeable, same transmission really just minor differences - like the final drive. as far as driveshafts you won't have any issues if you're installing it in a turbo vehicle, non turbo's have a different spline count. if it's a non turbo, just get a set of turbo axles for it and mix and match. someone calculated once before that going between 3.7 and 3.9 final drive is a relatively minor change, if you're really wanting to change the gearing you're better off going even higher to make the effort worth while...that's just regurgitating from someone else though, i'm sure others will comment more specifically. the front differentials should be interchangeable. EJ series front diffs may interchange - almost postive they do for the automatics, i'd imagine the manuals may as well. if this is the case then you can go with 4.11 or 4.44 gearing as well. Link to comment Share on other sites More sharing options...
Numbchux Posted October 20, 2007 Share Posted October 20, 2007 XT6 trans will bolt right up to an EA82 - completely interchangeable, same transmission really just minor differences - like the final drive. as far as driveshafts you won't have any issues if you're installing it in a turbo vehicle, non turbo's have a different spline count. if it's a non turbo, just get a set of turbo axles for it and mix and match. yep, the XT6 trans uses the same spline count as the FT4WD 4-cyl trannies someone calculated once before that going between 3.7 and 3.9 final drive is a relatively minor change, if you're really wanting to change the gearing you're better off going even higher to make the effort worth while...that's just regurgitating from someone else though, i'm sure others will comment more specifically. it is a pretty minor change. no way would I put lower gears in a turbo EA82 trans. the 1-5 gears are already rediculously low. but the XT6 version got the same taller 1-5 gears and shorter axle ratio as a PT4WD EA82 trans, but with a FT4WD center the front differentials should be interchangeable. EJ series front diffs may interchange - almost postive they do for the automatics, i'd imagine the manuals may as well. if this is the case then you can go with 4.11 or 4.44 gearing as well. oh man. more misleading info. 4.111 and 4.444 axle ratios are not possible unless using an EJ AWD center diff. front diff and ring gear are interchangeable. but the pinion is not. Link to comment Share on other sites More sharing options...
Sushi Posted October 20, 2007 Author Share Posted October 20, 2007 Beautiful. That is the perfect transmission for what I want, do they have diff lock too? I may have found one in a northern state too. Has anyone dealt with Atlas Auto parts in St. Paul, Minnesota? Link to comment Share on other sites More sharing options...
idosubaru Posted October 20, 2007 Share Posted October 20, 2007 yes, the XT6 trans has a center diff lock button. Link to comment Share on other sites More sharing options...
idosubaru Posted October 20, 2007 Share Posted October 20, 2007 more misleading info. hey, if someone is misled by "maybe" i appologize! i know someone installing 4.44 front diff guts in an XT6 auto trans, but i realize the manuals are another story. . Link to comment Share on other sites More sharing options...
Numbchux Posted October 20, 2007 Share Posted October 20, 2007 hey, if someone is misled by "maybe" i appologize! i know someone installing 4.44 front diff guts in an XT6 auto trans, but i realize the manuals are another story. . not a big deal. but the question comes up in the offroad forum every couple months "I heard you could use 4.111 axle gears in a D/R tranny!". so I just wanted to clear it up ASAP. Sushi...I've never even heard of Atlas. I'll ask a couple of the local guys. maybe Morgan's dealt with them. Link to comment Share on other sites More sharing options...
idosubaru Posted October 20, 2007 Share Posted October 20, 2007 the question comes up in the offroad forum every couple months.gothca, makes sense. is there an easy way to explain why it's possible for the auto but not the manual? if there's not, i can start another post or search. Link to comment Share on other sites More sharing options...
Phizinza Posted October 21, 2007 Share Posted October 21, 2007 I'm guessing because the Auto has a completely different inside that the pinionshaft isn't so special because it doesn't have to fit a particular centre diff that all the 3.9 4.11 4.44 ratio pinions bolt into all the weird gearboxes.. But really.... I have no idea cos I still don't pay attention to autos. Link to comment Share on other sites More sharing options...
Sushi Posted October 21, 2007 Author Share Posted October 21, 2007 Well, since the topic has gone towards autos suddenly, are the front axles from a turbo auto able to fit in a manual xt6 ft4wd? Link to comment Share on other sites More sharing options...
idosubaru Posted October 21, 2007 Share Posted October 21, 2007 are the front axles from a turbo auto able to fit in a manual xt6 ft4wd?yes. Link to comment Share on other sites More sharing options...
Sushi Posted October 22, 2007 Author Share Posted October 22, 2007 Ok. So I will take a 5spd FT4WD tranny from an '88 XT6 and put it in my '94 Loyale non-turbo which has a 5spd PT4WD tranny. Both have 3.90 diffs. And I will use the front axles from a 5spd xt turbo, or auto xt turbo. Sounds ok? Just making sure here.... :cool: As a side note, I am very impressed with the interchangeability (new word!) of these cars. Link to comment Share on other sites More sharing options...
idosubaru Posted October 22, 2007 Share Posted October 22, 2007 that looks right to me, the XT6 trans will definitely fit. Link to comment Share on other sites More sharing options...
mikeshoup Posted October 22, 2007 Share Posted October 22, 2007 Well, since the topic has gone towards autos suddenly, are the front axles from a turbo auto able to fit in a manual xt6 ft4wd? ONLY if its from a 4EAT. The 3AT Turbos are not compatible. I will use the front axles from a 5spd xt turbo, or auto xt turbo. Sounds ok? Just use axles from a 5spd turbo or 4EAT turbo. XT, GL, or Loyale all work. Link to comment Share on other sites More sharing options...
Phizinza Posted October 22, 2007 Share Posted October 22, 2007 Just use axles from a 5spd turbo or 4EAT turbo. XT, GL, or Loyale all work.Just to clarify, has to be turbo. Where it says "XT, GL, or Loyale" I think they will only work from these if they are Turbo models. I know it says that, but I just wanted to clarify it. Link to comment Share on other sites More sharing options...
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