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Guest Message by DevFuse
 

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Is it possible to swap the transfer case on a MT?

transmission dual range push button 4wd transfer case

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7 replies to this topic

#1 pgerbz

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Posted 13 September 2017 - 04:36 PM

I have a 88(I think) dual range transmission with a blown ring and pinion. Instead of buying a new ring and pinion from subaru for $500 I picked up a gently used 93 manual push button transmission($100) with the intention of taking the ring and pinion out of that. The transmission is perfectly fine except that I would be better off with the dual range on my rig. So my question is, would it be possible to just swap the transfer case on the end of the transmission? They seem to be the same size, and it would make the project much easier.

 

 

Thanks for the help.

And just for kicks I have an 88 Gl-10 4" lift ej22 swap



#2 DaveT

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Posted 13 September 2017 - 05:44 PM

1st thing to do is look up the final drive gear ratios of both.

#3 WoodsWagon

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Posted 13 September 2017 - 07:53 PM

The gear reduction in a dual range transmission happens in the input shaft between the clutch and the 5spd gears. It's in the front of the case right above the front differential. The single range trans just has a solid input shaft all the way through, and the case is not machined for the dual range reduction gears. The rear transfer case section is the same between the two of them.

 

So you have to put the ring and pinion from the single range into the dual range case to be able to keep the low gears. 



#4 pgerbz

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Posted 13 September 2017 - 11:41 PM

Okay I understand. Thanks a bunch!



#5 wagonist

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Posted 01 October 2017 - 07:43 AM

Actually, the rear case isn't the same between the 2. The single range box doesn't have the hole drilled for the low range shaft to come out the front (and it's a bastard to do as I've looked into converted a single range with centre diff lock into dual range).

But like WoodsWagon said, so long as the front diff ratios are the same between the 2 boxes, you'll be able to put the single range diff plus pinion & shaft into the dual range box (assuming it's a part time 4wd box & not the full-time 4wd with locking mech)

 

Bascially, keep as much of your dual range as possible & just swap the broken bits only


Edited by wagonist, 01 October 2017 - 07:44 AM.


#6 Crazyeights

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Posted 01 October 2017 - 05:30 PM

I installed an XT6 5MT (3.9 ratio) ring and pinion into a full time 5MT (3.7 ratio) dual range and it works.  I think that your ring and pinion swap should fit. It's a fair amount of work though.



#7 wagonist

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Posted 01 October 2017 - 06:21 PM

so your 5Mt (3.7) ratio must've been a full-time 4wd also, because that won't fit into a part time 4wd box. It's too long



#8 Crazyeights

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Posted 01 October 2017 - 07:52 PM

You're right it is.







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