Best Swap for a Quadratrac transfer case? - JeepForum.com
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post #1 of 21 Old 07-17-2008, 02:48 PM Thread Starter
k1llerkyle
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Best Swap for a Quadratrac transfer case?

I am having issues with my transfercase in my 76 CJ7. Wondering what you guys think would be the best swap out for it? Should I swap back in another? Is there something better I could put in place of it?

I have a 304 v8 with the th400 auto....

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post #2 of 21 Old 07-17-2008, 03:37 PM
jeepdaddy2000
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Can you explain your issues? Many times simple repairs of the unit will far outweigh the cost of a swap.
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post #3 of 21 Old 07-17-2008, 03:49 PM Thread Starter
k1llerkyle
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I think the chain is just stretched... seems to be slipping under load. I have not took it apart yet, but I am thinking that is what it is.

I was thinking a swap, as I know that the quadratrac doesnt have the best low range......

Thoughts?

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post #4 of 21 Old 07-17-2008, 04:20 PM
243
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What do you use the Jeep for?

There was no way I could mistake the chain jump on my Waggie's QT...bang, bang bang during acceleration right under my butt. Splitting the case is an easy job, many will counter with the cost of the the QT fluid but it doesn't take much to fill it up.

The low range is 2.57:1 compared to the D300 2.62:1, virtually the same.

1978 Cherokee, TBI 360/T400/QT...6.0/6L80/NP241C in the works...
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post #5 of 21 Old 07-17-2008, 04:31 PM
bigjoe
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I'm with jeepdaddy on this. If you believe the chain is jumping (most times it's do to lack of service, changing fuilds, checking chain slack) your best bet maybe to just do a part-time kit for the tcase. Mile-marker makes one with 16% overdrive. You could do part-time kit and add a low-range unit and be done. If you decided to swap out the Quadratrac I think only a Dana 18 case will work with the offset rear diff. You will also need adapter and new tail shaft for the 400. FYI the adapter verse the conversion kit is around the same price of $500 and change. Don't forget you'll need to make changes to the drive shaft lenghts as well. Hope this helps a little.
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post #6 of 21 Old 07-17-2008, 04:32 PM Thread Starter
k1llerkyle
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Quote:
Originally Posted by 243 View Post
What do you use the Jeep for?

There was no way I could mistake the chain jump on my Waggie's QT...bang, bang bang during acceleration right under my butt. Splitting the case is an easy job, many will counter with the cost of the the QT fluid but it doesn't take much to fill it up.

The low range is 2.57:1 compared to the D300 2.62:1, virtually the same.
YEP that is it.... i thought it was the rear driveshaft slipping.. but nope....

I use this jeep to beat around on the trails.. at least thats what I bought it for. It has a 4 inch suspension lift, 2 inch body, and 35s....
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post #7 of 21 Old 07-17-2008, 05:13 PM
ndigilio3
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find a 300, buy an adapter for the 400, put it in and call it good
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post #8 of 21 Old 07-17-2008, 05:49 PM
Totallymetal
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I would fix the quadratrac, I love mine with low range and TH400.


2007 JK Rubicon
5.5 Rock Krawler X-factor lift w/37 x 12.5 x 17 BFG KM2s, 5.13 Superior gears
Warn Powerplant HD

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post #9 of 21 Old 07-17-2008, 06:04 PM
jfwireless
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I rebuilt my QT and TH400 and they are running just fine. I have read several articles online about the QT part time kit. It really does not improve gas mileage much at all, so I do not believe it is worth the cost, time effort.

Rebuilding the QT is most likely your best bet. Make sure you get a Borg Warner chain, not a cheep imitation.

Jim
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post #10 of 21 Old 07-17-2008, 08:07 PM
No_Bs
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I'm going to have to agree with tossing it..... If it's an off road only jeep, there is no point in keeping the q-trac. Unless you can just get another, toss it in and call it a day, go with a 300, or swap out the auto for a manual.

1977 Cj5, 258, T-18, 2.46:1 Dana 20, 2.5" BDS lift, OBA, 38.5's. Chevy 60 frt, 14b Rear, Full hydro, 102"wb, full DOM cage.
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post #11 of 21 Old 07-17-2008, 08:07 PM
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The pluses to the part time kit are the ability to unlock the front axle. This can be important if you have a failure anywhere in the front system. You will also get a bit better fuel economy, better steering manners, and a huge drop in wear in the front axle. It also eliminates the need for the expensive Q trac fluid. Either way, changing the chain is a pretty straight forward job. Much less expense and effort than a conversion.
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post #12 of 21 Old 07-17-2008, 08:20 PM
bigjoe
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Someone correct me if I'm wrong. Isn't the Dana 300 tcase rear output in the center? Since the Quadratrac Jeeps are offset to the pass side of Jeep wouldn't the angle be pretty extreme for the rear drive shaft to work with a 300 case?
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post #13 of 21 Old 07-17-2008, 08:24 PM
No_Bs
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Quote:
Originally Posted by bigjoe View Post
Someone correct me if I'm wrong. Isn't the Dana 300 tcase rear output in the center? Since the Quadratrac Jeeps are offset to the pass side of Jeep wouldn't the angle be pretty extreme for the rear drive shaft to work with a 300 case?
Yes and no. It really depends on the length of the rest of the drivetrain. With the auto, no way. With a factory CJ T18/ Dana 20, probably fine. So yeah, I stand corrected. However, this is only a rear issue, if it were me I would ditch the offset rear and get a centered axle, but that's just me.

1977 Cj5, 258, T-18, 2.46:1 Dana 20, 2.5" BDS lift, OBA, 38.5's. Chevy 60 frt, 14b Rear, Full hydro, 102"wb, full DOM cage.
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post #14 of 21 Old 07-17-2008, 10:22 PM
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Quote:
Originally Posted by jeepdaddy2000 View Post
The pluses to the part time kit are the ability to unlock the front axle. This can be important if you have a failure anywhere in the front system. You will also get a bit better fuel economy, better steering manners, and a huge drop in wear in the front axle. It also eliminates the need for the expensive Q trac fluid. Either way, changing the chain is a pretty straight forward job. Much less expense and effort than a conversion.
It's only 8.00 a quart so less than 25.00 from Crown...if cost is really an issue, you can use non-detergent 30W motor oil and a friction modifier.

If it's never on the highway, leave it in e-drive and weld the spiders.

1978 Cherokee, TBI 360/T400/QT...6.0/6L80/NP241C in the works...
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post #15 of 21 Old 07-17-2008, 10:32 PM
243
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Sorry if I sound like a Quadratrac slut but I am...they are cool, innovative (when introduced) and reasonably strong xfer case with a lot of advantages for a dual purpose 4x4. I hammered my QT behind a strong 401 in my Waggie and it never whined. It may not be right for everybody or even the OP but a chain solves the number one problem in about 8 hours.

The NP205 may be a reasonable option behind the T400.

1978 Cherokee, TBI 360/T400/QT...6.0/6L80/NP241C in the works...
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