t-case options??

[jeepdreamer]

Anybody know what t-cases will bolt in to replace a quadratrac case??

[mattmopar440]

a Dana 20 but you have to do some work there is no direct replacement for a Q-trac

you have to get new drive shafts and swap tailshaft out of the trans

[mdill]

I beleive that the output shaft in the Th-400 has to change before any othere T-case can be "bolted" on.
If you are going to do that then there are stock GM and Jeep parts to bolt on a Dana 20, NP208C, NP205, NP241C ... ???
I think the 208C would be the cheapest, the 205 the toughest, the 241 better than the 208 but not many around for PS drop, the dana 20 is OK also

Mike D.

[4x4fEvEr]

What about bolting a D300 to a jeep th400?

[tgreese]

You can if you buy an adapter.

http://www.novak-adapt.com/catalog/kit_134.htm

[sappy76]

What's a better setup, a th400/Quadratrac or a th400/D20? Is there any real advantage of one over the other for strength? I'm considering D44/D60 and I might have a couple of options. I guess I found my answer here

http://www.ifsja.org/forums/vb/archive/index.php/t-14413.html

[Bobbo]

guess I am going with the NP205 case. Then will get a doubler or klune in the future.
But I am interested in hearing anything about the D20 cause I have a older rig with a D20 I think in it and was wondering if that is a easy swap?
It's a older wagoneer and it has the buick 350 in it. I have no idea what tranmission it has though. Anyone who knows might chime in and let us know if the D20 is a cheaper swap cause this np205 swap will kill my whole savings just to collect the parts.

[Bobbo]

And no there is no other t-case that will bolt up behind the th400 that had a quadra trac behind it.
Would it be possible that my older 60s wagonner would have the th400 with a dana 20 behind it? If so would the tailshaft from that old trans swap with the one I have with QT?
Not trying to highjack, but this could clear up some stuff for someone looking to swap out a QT

[mdill]

If you are willing to open the Th-400 and swap the output shaft and buy custom adapters any T-case can be swaped on.
The back end of a Jeep Th-400 case is the same as a GM Th-400 case, so swap to a GM output shaft and use any T-case GM offered behind the Th-400,
or if you want swap a Jeep Th-400 output shaft from a D-20 Jeep truck (pre 73 ?) into you Th-400 and run the D-20. Keep in mind that the early Jeep Th-400 (Based on the Nail head Th-400, with adapter ring) is I beleive a different total lenght than the Th-400 with the AMC pattern, so the T-case shifter might not line exactly up with the stock hole in the floor.

Good luck

Mike d.

[jeepdreamer]

Boy, did i open a can o'worms!! LOL
So im kinda leaning towards dumping the 400/Qtrac. I believe it is an ok system that was ahead of its time. Unfortunatly it is maint. intensive and not very "bomb-proof"! When its maintained its great... point and shoot! But the mile marker part time kit is really a must (more $$) and even then the chains have a very finite lifespan. God help you if you run out of the "Special" fluid.. BOOM!! SNAP!!! BANG!!! just like an old Batman comicbook!! Aluminum scrap anyone?? Kinda sucks since the T400 is one of the BEST auto trannies ever made!! Also, to swap the output shaft the tranny must be completely dis-assembled so you'd be foolish not to rebuild it (MOREmore$$) plus the cost of the novak kit. I had forgot about the funky quadratrac mounting pattern. I think im going to either A: source a junkyard tranny/t-case combo or B: part out my 200 dollar investment and use what i need and sell the rest.?. Can someone remind me if the Q-trac is dvr or passenger side diff up front??

[Bobbo]

Qt is a pass side drop. I am with you on the QT. I have been through 3 cases in 20,000 miles. I would just love to be able to mash the gas and unleash my 401 again. I love the case for a DD but they have not held up well to my 35 inch tires and 401.
So as I was reading if I have a 60s wagoneer (which I do-not sure of year)
I might have a th400 and I could swap out the tailshaft and housing and my D20 and have a real 4x4 ? The shifter is of no concern cause my jeep did not come with low range so I have no holes in the floor yet. And yes I will rebuild my trans-really cheap to do while I am there. I am also figuring on getting new driveshafts as well.
I cant wait to go get the old jeep this weekend and see if I have this stuff!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[mdill]

Your truck has the hole in the floor, but the hole will have a plate bolted over it, not sure how much the shifter will miss-align with the hole, might be a minor issue. I am not 100% up on the real early Jeeps but I believe you have a 68+ donor (Buick engine) which would have a Th-400, so swap the guts, bolt on the stock D-20 adapter, add some drivelines to match and you should be good to go.

Qt is a pass side drop. I am with you on the QT. I have been through 3 cases in 20,000 miles. I would just love to be able to mash the gas and unleash my 401 again. I love the case for a DD but they have not held up well to my 35 inch tires and 401.
So as I was reading if I have a 60s wagoneer (which I do-not sure of year)
I might have a th400 and I could swap out the tailshaft and housing and my D20 and have a real 4x4 ? The shifter is of no concern cause my jeep did not come with low range so I have no holes in the floor yet. And yes I will rebuild my trans-really cheap to do while I am there. I am also figuring on getting new driveshafts as well.
I cant wait to go get the old jeep this weekend and see if I have this stuff!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[jeepdreamer]

Ok,
Since the QTs passenger side drop my t-case of choice would be hands down the dana 300! I know they are not as available and cheap as they used to be but they CAN be found! I tripped over (honest..no crap!!) mine in a junkyard in eplaso... offered 100 bucks and got it for 125!!! I think this is the finest example of what jeep should have ( and still should!!) offered. Iron case is very stout!! low range is very good too. I dont do the Extreme stuff like chili challenge but my rock trails are pretty tuff! I would put the 300 up against any other case out there and i think dollars to dollars, the 300 wins! Its upgradeable if you feel you MUST?? it doesnt wiegh 50 tons (203-205) and i can be adapted to almost anything! Center in-center out, all gear drive.... Me LIKEY!!
Granted, it is based on the model 20 but it was vastly improved IMHO.

[Bobbo]

YAAAAAAAAAHHHHOOOOOOOOOOOOOOOOOOOOOO!!!!
Good grief am I gonna get lucky for once and not have to sink a ton of money into a project. Wait, I better not get to excited yet. I still need to dig that thing out of the snow and make sure its the 400 trans. This would be a great thing to happen to me.

[Bobbo]

Jeepdreamer I would agree the 300 is one of the better cases, I was gonna go with a np205, cause I got one for free. Turns out it was a th350 version and you have to machine the case to make it work for a th400.
I will go with my D20 cause its free (praying that its what I need)
Meanwhile I will save for the 205/203 doubler with a lowmax kit. I want all the options I can and when my 401 dies it will get a big boost in power and one ton axles are in the wish list as well.
I cant seem to ever run into a d300 case for sale around here ever. I also would have no idea how to mate it to the th400. (a great trannie)
Guess I never researched it either.