Is it worth swapping in a 4 low 1339 my J10

[candymancan]

So i have a spare th400 and 1339. And im trying to sell them.. but before i sell the 1339 is it worth swapping iver to my 76 j10 that has the quadra trac without. ? I almost wonder if i should just keep it anyway.. in case one day my quadra trac goes bad. Atm its fine and works

Ill be honest here.. in my 15 years owning Jeeps. Ive not once ever needed or used 4 low.. even driving through 2 feet of snow with mud in my wagoneer. Or 2+ feet of snow in my ZJs.. i never have gotten stuck or need 4 low.

And the 1339 seems diff.. the quadra trac has emergency mode and 4 low.. whats the diff between them ?? Thats one thing that cpnfuses me.

Like on a 249 quadra trac in 4 low it locks the center diff.. and gives you better gearing. But what about the 1339 what does emergency mode vs 4 low do ?

[will e]

Your transmission will be happier if you are running mud in low range.

[tgreese]

The low range is a bolt-on thing. You could keep the other case as a spare; I would.

Also, the transmission output shaft is another wear item. Goes into the low range. You could keep the one with the least wear on the splines, though it's a big job to switch them.

[candymancan]

You mean the splines on the th400 wear out ? how is that possible ? The only thing i did see on the th400 adapter was large ball bearings, which i can see wearing out, do they even get lubricated ?

[tgreese]

You're slacking. Basic knowledge for any BW 13xx owner. https://www.jubileejeeps.org/quadratrac/index.htm

QTOutputShaft.png

[candymancan]

I just got this j10 like what 5 months ago so i know nothing of th400s or the quadratrac really ? II havent had to do any work to its transfercase besides change the fluid in it.

As for slacking, you do remember i rebuilt this trucks entire bed from scratch right ? Ive done a ton to something i knew nothing about in just 5 or so months time, the bed is something i doubt even you or most here have done here., my skills are all over and im still learning. Stop insulting me. Im actually getting really sick of your smart ass comments. I wouldnt let you get away with it in person if it happend as often as it does here.. no one likes a smart ass know it all

So im telling you to stop the suble insults and stop with your smart ass cocky know it all attitude. Im about done with it !! If youre really that bored to insult everyone on a forum because they lack knowledge which i see you do all the time.. then maybe i suggest you go touch some grass and get a life !


Thanks for the info on the 1339 though, thats all you had to do versus.. WELL you lack basic knowledge for a 1339 owner smart ass comment ! I dont have the bang issue so i guess mine is fine

[tgreese]

Glad my post helped you. Lots of good info on the Jubilee Jeeps page.

[candymancan]

The slacking chain reminds me of something i gatta do in my quadratrac 249 in my 98 ZJ.. That chain is stretched badly, if i put it into gear and step on the gas right away itll SLAM or pop loudly under my seat due to the chain skipping a tooth.. Gatta wait for the transmission to pull the slack out before i go..

im waiting for this 249 to explode

[seventynine]

The 10 spline blues…you may get to know it. It will bang particularly going into reverse as it wears.

2.57:1 gear reduction with the low range on QT. That’s a pretty good stock gear reduction. The Dana 20 is only about 2:1. I’ve used the ones I’ve had a lot. Mostly pulling something heavy up a hill slowly. It won’t help you that much in the snow. I’d keep it. As others have said…the low range unit will bolt right on to your other transfer case. You’ll need the flag shifter though.

[tgreese]

There are owners out there that want the low range unit by itself, but I expect it will add more value to the truck installed than selling it by itself. Once it's installed, you may use it more than you expect. The hunt for good transfer case cores has been underway for decades; if I had a good spare core I'd keep it for myself until the truck was gone. Good for parts if not as a complete unit.

[seventynine]

Quadratrack is a full time Four wheel drive system with the transfer case acting as a limited slip differential of sorts between the front and rear axles. When you engage “emergency drive” it locks that center differential (aka the transfer case) so you get more traditional 4 wheel drive….equal power going to front and rear all the time. The low range on a QT just reduces the gear ratio. They are unrelated.

[seventynine]

Make sure you put the right sauce in the T-case.

[tgreese]

The low range is much like the Warn overdrive on a Dana 18, except the Warn is 0.75:1 versus 2.57:1 - a separate planetary transmission. Cool.

[candymancan]

Is it normal to have some wheel hop/bindjng when say full lock turning ? I know for my 5.9 ZJ it happens somrtimes with its full time quadra trac

But im noticing it on this J10 too. Like i csn feel it in the steering wheel if i full wheel lock for a sharp u turn. If i let go of the steering wheel you cab see it wiggle left right.

Also probly un rrlated to the transfercase. But i sometimes feel and hear a pop dirrctly under the drivers seat when i turn and back up fully wheel locked. Only thing i csn think of thats down there is a body mkunt. But it isnt that. Or the leaf spring. Front springs are original but with coil over load assist shocks. The spring are fine other than some drop in ride height but theyre not inverted or anything the coil overs fixed that drop in lift.

Also im noticing poping in the steering wheel itself when i say hit certain bumps. I checked that u joint on the stearing shaft below the brake booster and kt does wiggle/pop. So i guess that needs replaced.

Do they sell replacement joints ?

[seventynine]

You will absolutely feel the binding if you have it in emergency drive. Binding when in regular full time four wheel drive could mean the cones and clutches are wearing out in the Quadratrac. Have you changed the fluid lately with proper QT fluid?

Before I changed the leaf spring bushings in my ‘79 Wagoneer…the springs would slap back and forth in the shackles under turning load. Loud pop. It’s a bitch getting those old steel sleeve bushings out of the spring eyes without a press. Your problem could be something else in your case. Not sure.

[candymancan]

Was thinking that. I also have a bad u joint on the steering wheel thing under the brake booster.. it pops too.

As for leaf aprings ya i thought about that ill look at its bushings. I need to replace the springs anyway. Theyre flat i put coil over shicks on fif now to give me 2 inchs back ti factory. Replaced the rear aprings first as those were broken rusted.. bad mounts etc..

Fronts are fine just flat.


Transfercase is fine now. Yes i did the crown tcl1 fluid. I had to go do multiple full circle turns and it stopped binding. Its fine now