Quadra Trac with hubs????

[scj]

Here is the deal I just finished putting together a 77 J-20 with a 401 Th400 QT. I bought
the truck with a blown up motor and a bad transfer case (motor has thrown a rod and T-case only had low range). I found a 77 J-10 for parts( bad body good engine etc.)
After swaping motors and transfer cases and getting it runing everything works.
Except my the J-20 has hubs on the front and it will not move unless the hubs are locked. Put it in gear and the front drive shaft and axels just spin.
Lock the hubs and it goes like normal (e-drive, low and high range etc.) This has me confused the J-10 didn't have hubs but the transfer case worked in it.
My question is, is there something wrong with the Transfer case? or does it need resistance in the front to work? And why the hubs in front?

I would be very gratfull for some help. I am really looking forward to drive this truck. but it has me confused.
Thanks
SCJ

[River Beast]

QT equipped FSJ's had autohubs...meaning they were ALWAYS engaged (solid chrome cap on the hub). The QT is a unique T-case that requires all wheels to be engaged due to the design of the center differential. It has a limited slip capablity that allows for traction on all wheels.... even on pavement. Keep you rhubs locked... or you will damage the QT center diff and there are no NEW replacment parts for the center diff of the QT... you can only find them boneyards or here ;) .

You can drive a QT quipped rig without a front shaft, but must be in E-drive to do so or you will tear up the QT unit.

The QT slips automatically when turning or when you spin a wheel... the downfall is that it sends power to the wheel(s) with the least amount of traction... in your case there was no resistance to the front end, therefore sent all the power to the free spinning front shaft.. leaving you in a no mobile state.

I hope I didn't confuse you any more... I can start ramblin' a bit:D

[JEEPGUZZZI]

One of two things was going on with the J20. Either you did not have a Quadra trac, or, more likely, someone had installed a part-time conversion kit. That is where the hubs came from. If the truck you took the transfer case out of did not have manually locking hubs, then the quadra trac is original, most likely. In that case, run with the hubs locked, like RB said, or convert back to standard hubs.
From what you have described, I'd say that your busted t/case had a warn part time conversion kit, and your donor truck still had the factory set up.
You may have drained tranny fluid from the old t/case. If it had the conversion installed and you drain something like gear oil, then we know why the case failed. :rolleyes: Be sure to use ONLY Quadra Trac fluid in that new ;) transfer case!!!

[scj]

Thanks for the info. I bought the J-20 from a dealer that took it on a trade in and it allready had the blown engine ( a hole in the oil pan the size of a soft ball where it threw a rod) I assumed that everything else worked. When I put the other engine in it everything worked other than I only had low range. So I swapped transfer cases. (Which are Quadra trac's) Filling the doner with fresh Quadra Trac fluid. And that is where I am now. I don't have a problem running it with the hubs in.
If that is what it needs.

Thanks again for the info.
SCJ

[JEEPGUZZZI]

Why don't you come over to the Ouray invasion so we can double check your rig in person? :D :cool:

[ColeTrickle]

I may be to late...get that part time conversion set up on your newer Quadra-Trac. You won't be sorry.

[Pete1111]

I have a quick question for everyone that reads this... I see a lot of posts including this one that says you must use Quadratrac fluid only in the QT transfer case. I even remember someone writing a few weeks ago to use 30w oil combined with another product. Thing is, my owners manual for my '82 Wagoneer says to use Auto Trans Dextron III fluid ONLY in the Quadratrac case. What is the correct fluid to use??? :confused:

[River Beast]

Your Quadratrac is a newer version of the BW1339... your's is DEXTRON III... the BW1339 QT MUST run the QT fluid or the hybrid mix of 30W and LS addative.

[ColeTrickle]

RiverBeast, what's the years for the older QT system, I'm guessing pre-80 era. Am I right?

[Pete1111]

OHHHHH!!! Thanks a lot Riverbeast! I was really confused why everyone was saying one thing but my original owners manual that came with my Jeep says use Auto trans fluid. Thanks for clarifying!

[JEEPGUZZZI]

Hey,Cole!! That pic looks just like my J10! :D
Borg Warner 1339 Quadra Trac was in Jeeps through the 1979 model year.

[River Beast]

Originally posted by ColeTrickle:
RiverBeast, what's the years for the older QT system, I'm guessing pre-80 era. Am I right?74-79 in the FSJ and I think the SWB Jeeps started the BW1339 a bit earlier, but ended in 79 as well

[ColeTrickle]

Hey thanks guys.

RiverBeast you through me off when you said that there was a newer style BW 1339. Didn't know that. I had thought there was only one version. So if there are two types what was the newer model installed in and how can you tell the difference if your looking at the two. Sorry for the ?'s RB, just want to be certain in case of me runnin' across a spare.

JeepGuzzzi, your gonna have to get some pics up so I can check it out. Is it black with the yellow and orange stripes? And you going to Ouray...right? :cool:

[andy d]

i think i see where the confusion lies. uptil 79 or 80 fsjs used the th-400 and the b/w xfer and called it quadratrac. in 81 -82 they went to 727 trans and the np 219 fulltime t-case and also called it quadra trac.Pete, your 82 tcase is a np 219 and does indeed use dextron. hth

[JEEPGUZZZI]

My J10 is actually dark blue. It was repainted by the previous owner. Yes, I will be in Ouray, but I will be driving my 1979 Cherokee Chief. It is green, very green.

[River Beast]

Originally posted by andy d:
i think i see where the confusion lies. uptil 79 or 80 fsjs used the th-400 and the b/w xfer and called it quadratrac. in 81 -82 they went to 727 trans and the np 219 fulltime t-case and also called it quadra trac.Pete, your 82 tcase is a np 219 and does indeed use dextron. hthBINGO!!!! I couldn't remember the number of the case... it's the NP219

thanks for clearing that up!!! ;)

[Lindel]

BW 1339/1305 (no low range), was used in the FSJ from 73 - 79, and in the little jeeps from 76 - 79. At least that's the documentation I saw, doesn't necessarily make it right.

As far as the truck having the QT, and hubs, and not moving with the hubs disengaged, I'd say the PO had a part time rig, and swapped in the QT later, much like I'm going to do. I'll just leave the hubs in place, but locked all the time.