Putting in a "real" t-case

[2MANY4X'S2FIX]

Is there a t-case with low range that will bolt in place of my quadratrac? Something that will plug and play, ie. not require a act of Congress to function properly. I'm willing to cut holes in the floor and make new driveshafts but I really don't want to turn this into a epic saga.

[robselina]

Altas :D

Jokes aside, D20s are supposed to fit. Hopefully Riverbeast and some other people will chime in.

[tomd]

Just get a low range unit for the QT...it bolts right up, just need to mount up the paddle and whatnot. Probably the cheapest and easiest, but maybe not the best solution.

[paddyp]

The only thing that will plug and play will be the low range unit for the QT, anything else will involve swapping the output shaft in the TH400 at the very least.

[2MANY4X'S2FIX]

I have a TH350, it's a 3 speed. My repair manuals say it will be a TH350 and from looking at it I would say it's too short to be a TH400. I'm a little bit burned out right now. I've had a lot of modded 4X4's and while I enjoy the hobby I would like to do something that will improve the performance of my Jeep without going nuts trying to get it to all work together. Whats the deal with the bolt on low range? Why would it not be the best solution? I had a 78 3/4 ton Suburban with a 454, muncie 4 speed and Dana 20 T-case and GM 14 bolt rear and Dana 44 front. I put a Marlin Crawler in the thing and it was not overly complex. I've been toying with the idea of sticking one of those in front of the Quadratrac t-case and callin it good enough. It was a helluva lot easier than getting the ARB air locker to work in the front axle of the Sub. No matter how long I made the front hose it seemed that it would get hung up and rip when I approached full flex. Anybody else ever have that problem? I finally used a copious amount of zip ties to route it and some flex sleeving (the kind used on wiring harnesses) and got it to stay.

[J20 project]

Not sure how you ended up w/ a QT bolted to a th350 as nothing I'm aware of ever came stock this way, unless it's the international. If it is the th350 then you have a setup which has already been adapted in some way so all bets are off as for help. Back to what someone else suggested, put a low range unit on the QT. If you are looking for bullet proof, you'll never have it w/ the QT. Opinions vary on the last statement(disclaimer). to put a D20 against a th400 which had QT, you must get the proper adapter and tailshaft for the th400, driveshafts don't change much on this conversion.
J20

[2MANY4X'S2FIX]

Crawled under it with a flashlight, yes it has a TH350 and a Quadratrac. Looks factory as the switch is in the glove box. Guess I managed to find yet another oddball. My Haynes and Chiltons manuals both say that 74 model Jeep J10's were available with GM TH350 auto tranny's and Quadratrac full time 4x4. What do you think? Special order?

[Crazy_Jeepman]

Something is not right. My Haynes manual make no mention of a TH350, FSM same thing. I have parted out a good many FSJ,s and have never seen anything but a GM TH400 in front of Q-Tracs. Bolt patern for the GM 350 would not be correct, nor would the Trans to T-Case work. I would LOVE to see a Picture of that TH350. Where is the Modulator on your Trans, and do you have a Wire going to the plug on the Drivers side of the trans?

[Desert Beast]

real transfer cases are gear driven. :D .

just get a 205 and never worry about it again.

[2MANY4X'S2FIX]

AWWW HELL! Did I inherit somebody elses screwed up project? It's got a 3 speed column and the Q-Trac control is in the right place. Doesn't look like it was added after the fact. It's definetely a TH350 and I'm pretty sure it's a Quadratrac of some sort. It's full time 4x4 and I don't have a t-case shift lever but all 4 wheels do spin. What the heck do I have? The reciepts for the engine and tranny rebuild say AMC 360 and TH350. Decided to pull em out of the glovebox. So is this a factory set up or????? If I remember right aren't TH400's 4 speeds? This truck only shifts 3 times. What was the factory 3 speed auto tranny option? Haynes says TH350 in the transmission section.

[Desert Beast]

th400 is a 3 speed. 700R4 is or 4L80E are the 4 speed autos.

[paddyp]

If I remember right aren't TH400's 4 speeds? TH400s are 3 speeds. Look at the pan, a TH350 will have a rectangular pan w/ a corner notched out, the TH400 will have an irregular shaped pan. The only transmission that came w/ the QT attached is the TH400.

[2MANY4X'S2FIX]

OK, I'll check again in the daylight. I have a reciept saying the TH350 in the truck was rebuilt, if it turns out it's a TH400 I guess that means I got hosed on that deal. Time to bust out the jack, jackstands, Maglite, and Miller Highlife. I'll get to the bottom of this mystery yet.

[2MANY4X'S2FIX]

Ok, heres what I have. It has both cooler lines on the passenger side. Theres a wire coming out of the top of the tailshaft. It has a 14 bolt oil pan and says Turbo Hydramatic on the side. TH350 or TH400? The rebuild reciept says TH350. If it's a 400 I guess I can assume the rebuild receipt is for another vehicle and I got screwed. I don't know all that much about transmissions. My thing is engines and tranny's are a mystery to me. I know enough to pull em out, sling em in the back of a truck and haul em to a tranny shop. Then I can reinstall them. Thanks for all the help so far guys.

[paddyp]

Originally posted by paddyp:
</font><blockquote>quote:</font><hr />If I remember right aren't TH400's 4 speeds? TH400s are 3 speeds. Look at the pan, a TH350 will have a rectangular pan w/ a corner notched out, the TH400 will have an irregular shaped pan. The only transmission that came w/ the QT attached is the TH400.</font>[/QUOTE]Just look at the shape of the pan. That is how most auto trannys are ID'd. A TH350 pan looks completely different from a TH400 pan. Quick and easy.

[2MANY4X'S2FIX]

The pan is not square. It's more like Deleware.

[LRRH]

Miller HighlifeAhh...the champaigne of beers......LOL =)

Anyhow, I've always thought the TH400s looked like a TEXAS shaped pan......but who knows, heck, I don't even know what shape Delaware is! If it's a funky shape it's probably a TH400.

Also, not that it's a "perfect" way to tell or even misleading but the dipstick on my tranny says "TH400" by the "add fluid" line.

[LRRH]

http://www.50states.com/maps/delaware.gif

man that's one messed up tranny :cool:

more like this?

http://www.50states.com/maps/texas.gif

http://www.novak-adapt.com/images/graphics/th400_specs.gif

[2MANY4X'S2FIX]

The bottom pic. Hey I'm on vacation til the 16th. I'm sipping some sort of alcoholic beverage 24/7. :D :D So I guess the reciept for a tranny rebuild is bogus? Prolly the seller trying to jack up the price. **** the luck. Oh well it's my first Jeep so what do I know. Will a Dana 20 hook up to it?

[paddyp]

Need the right adapter for the Dana 20, and I think you need to swap the output shaft on the TH400.

[trickc]

I don't get the overwhelming urge to ditch the q-trac. I run one in my wheelin rig with 36's and have had no problem, where I have seen a dana20 bust on the same trail I was on. Bolting up a low range on a q trac is a no brainer and would be alot cheaper/easier than swapping trannys just to run a t-case with a lesser lo range to it.

Just my .02- flame away ya'll.

[blt2krl]

Trickc, I agree with you. My Q-t worked flawlessly with 37's and 5.38 gears. It only sarted to act up when I threw 39.5 inch tires at it. I think they are fine up to a 36 inch tire.

[War Wagon]

Just add the low range unit, 5 bolts, snap ring, add shifter, add special fluid and your are done. I will say again special fluid.

Low range 2.57:1, better than most.

Q trac, you either love them or hate them. I came from the hate side to the love side after running The War Wagon some and learning how to take care of it.

Q Trac Info Link (http://www.jpmagazine.com/techarticles/23658/)

Jim

[ November 12, 2004, 06:02 PM: Message edited by: War Wagon ]

[2MANY4X'S2FIX]

War Wagon, that link causes my Windows Explorer to shut down. Is the bolt on low range a aftermarket piece or can I get one at a salvage yard?

[tomd]

The bolt on low range came on a large number of QTs, should be able to find one in a yard or in the FS section here....

[gladiator]

For a chain drive case, I thought the Q-trac was pretty good. My experience was to make sure that the chain did not get excessively stretched. I seem to recall that there is a plug in the case, you can pull and put a probe against the chain to check the amount of stretch. Above all, use the right lube!
Oh ya, 79 and prior used the mechanical differential clutch, and later used a viscous clutch. I think the older ones are the better item.

[paddyp]

Oh ya, 79 and prior used the mechanical differential clutch, and later used a viscous clutch. I think the older ones are the better item. The later models are a completely different case, the NP 229. The Quadra Trac that most people refer to is the BW 1305 or 1339.

[scotty]

the QT was ahead of its time as far as full time transfer cases go. compare it to the np203,wich was a simple open center diff.easy to get 1 wheel spinning in the snow ;)

there are a couple of things that i dont liek about the QT:
-chain drives both front and rear outputs. this causes the cahin to wear out in as few as 50,000-60,000 miles. way quicker if you use a poor quality cahin.
-spline engagement in "E drive" locking the front and rear shafts together is minimal.
-the magic fluid needed for the clutch cones.

not that im knocknig the QT. lots of people here have used it in trail rigs,tow rigs and daily drivers.like anything else you get back out what you put in. keep a good chain and the correct fluid in it and iwill likely not fail you under normal use or moderate abuse ;)

like theu guys said,the low range unit is a minor PITA,but it bolts right on. or just swap the whole case out for one with low range. if you are a foot to the floor,make it or break it with big tires kind of feller,ya might want to swap in a 205 in the first place and be done with it.

where are ya located? im in dayton,oh,and ive got a QT under the back porch with a low range id let ya have cheap if you come pick it up :D

[War Wagon]

Try this link,

http://www.frontier.net/~mystkblu/quadratrac/

[2MANY4X'S2FIX]

I'm in Texas. Too bad.

[Gawdzilla.]

I have a low range in good shape. 70 shipped. (50 for the unit, 20 shipping unless you can find a better ship rate).

[2MANY4X'S2FIX]

Gawdzilla, I'll take it. Might not be until middle of next month though. I just scored some Travvy parts! Email me at neqaxt8720@sbcglobal.net

[Gawdzilla.]

u got it. I hear ya on the dry counties...hated having to drive to murphy(?) for a beer when I lived in Wylie.

[2MANY4X'S2FIX]

Yeah, sucks living in the buckle of the Bible belt. Jacksboro went on this huge kick earlier this year. Beer and Wine sales were coming up for vote again. Baptists were screaming about how it will destroy the morality of the town. Evangelists were going on and on and on about the children, etc. I just followed the high school kids to the liquor store on Friday after I moved here. It's just 12 miles up the road. :D

[Gawdzilla.]

if it weren't for them, I'd have never figured out where to go either! then I'd get lost going home since nothing goes true NS/EW.