84-85 Trucks & 4Runners 2nd gen pickups and 1st gen 4Runners with solid front axles

Swapping forward shift for top shift

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Old 09-06-2013 | 07:24 AM
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Swapping forward shift for top shift

Ok so other than the holes in the floor for the shifter not quite lining up correctly and the shifter being moved back a bit, is there anything more to swapping a forward shift tcase for a topshift? I found an awesome deal on a 4:1 topshift tcase with twin sticks. I would rather run that for wheeling than the factory 2:1 case. My truck is a forward shift though and just want to make sure Im not overlooking anything other than bolting it up to my stock tranny and cutting a new hole in the floor. I already searched and I couldnt find a definitive answer.
Old 09-06-2013 | 07:33 PM
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From: The Dirty South
As long as you have a complete top shift(shifter included), it should bolt right in. Don't forget you will have to seal the forward shift portion on the transmission top. I would guess you could just remove the shift rails and leave the shifter if you had to. Might look pretty ghetto, but hey.....
Old 09-08-2013 | 01:42 PM
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Well picked up the Tcase yesterday, just too good of a deal to pass up. Already came up with a game plan, I was going to build a custom center console with a lockbox to hide my valuables when driving with half doors. So the shifter ordeal wasnt a huge thing. Next weekend I plan on removing my factory Tcase and blocking the shifter hole on the transmission. Then bolt up the new tcase, cut a hole in the floor for the shifters and be done for a bit.
Old 09-09-2013 | 08:42 PM
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Just swapped in a new trans and transfer case that was a top shift. Just had to cut the hole a little larger in the floor. Everything bolted right in.
Old 09-12-2013 | 11:27 PM
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Originally Posted by sam24th
swapping a forward shift tcase for a topshift? I found an awesome deal on a 4:1 topshift tcase with twin sticks. I would rather run that for wheeling than the factory 2:1 case.
hopefully you kept the forward shift tcase? because you can use it for a dual transfer case setup.

of course it's expensive :-( but getting that second case is a step in the right direction.

the way it works is that the rear transfer case has to be top shift, but the front transfer case can be forward shift.

so when you say 4:1, you mean 4.70 gears? that's a pretty sweet deal! count the teeth, it'll probably have to be 21 tooth to fit into your trans.

4.70 gears with 23 teeth are strongly preferred for the rear case in a dual case setup.

Last edited by osv; 09-12-2013 at 11:30 PM.
Old 09-13-2013 | 03:12 AM
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From: The Dirty South
Originally Posted by osv
hopefully you kept the forward shift tcase? because you can use it for a dual transfer case setup.

of course it's expensive :-( but getting that second case is a step in the right direction.

the way it works is that the rear transfer case has to be top shift, but the front transfer case can be forward shift.

so when you say 4:1, you mean 4.70 gears? that's a pretty sweet deal! count the teeth, it'll probably have to be 21 tooth to fit into your trans.

4.70 gears with 23 teeth are strongly preferred for the rear case in a dual case setup.

I am thinking you mean splines, not teeth?
Old 09-13-2013 | 07:37 AM
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From: Tucson
You can swap your forward shift linkage into the new t-case and keep your shifters where they are if you want. The parts are all interchangeable.

Its not that hard to do. Easier than relocating your shifters and cutting your floor.
Old 09-13-2013 | 08:32 AM
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splines is correct, I had just finished a 12-hour shift installing my w56 dual case deal, new marlin trans and dual stick on the rear case, all I could think of was teeth, lol
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