'79 QuadraTrac Lift Question - JeepForum.com
 
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post #1 of 10 Old 10-06-2009, 10:29 AM Thread Starter
Rough85CJ7
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'79 QuadraTrac Lift Question

I have recently purchased a '79 CJ7 with the 400 & QT tfr case. I want to lift it, but after looking at the rear driveshaft (stubby doesn't even cover it) - I'm worried about the angles for a lifted set up. I already have some 4" lift CJ7 springs that i could use, but don't want to ruin anything. I know guys are doing it successfully - any insight?

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post #2 of 10 Old 10-06-2009, 02:10 PM
jfwireless
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I am using the Skyjackker J20RS 2.5 inch lift springs in the rear on my 1976 CJ7 304/TH400/QuadraTrac with no issues. I do not believe another 1.5 inches will make any differnce at all.

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post #3 of 10 Old 10-06-2009, 06:58 PM
garbageman
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I'm running 4" BDS on a 76 with Th400/QT and yes it's steep, but the diff and rear output is in phase. No vibration and still plenty of slip in the drive shaft.

1979 CJ7 - Propane powered 258/TH400/Q-trac- 2015 Project
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1974 CJ5, 1980 Wagoner, 1976 CJ7
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post #4 of 10 Old 10-07-2009, 11:21 AM
tankcj
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I had a slight vibration after installing the lift and went with a Tom Woods CV shaft and new pinion angle shims and now I have no vibration.

'76 CJ7, 401, TH400, QT part time, 33" Baja Claws, 4" Procomp, USA Alloy front and Yukon one piece rear axles, 4.56 gears, Aussie Lockers front and rear, front disc conversion.

2011 2dr Rubicon Auto, AEV 3.5" Premium, PSC Brawler Lite front bumper and skid, Evap skid, Raceline Monster beadlocks, 35" KM2s, 5.13 gears, Trailgater, Expedition One rear Bumper and Tire Carrier, ACE Rock Sliders, Warn Powerplant, ORW trans cooler
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post #5 of 10 Old 10-07-2009, 11:42 AM
Totallymetal
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1" TC drop fixed my vibration from the lift, but I want to put a double cardan joint in there to get the ground clearance back. I am not sure if there is enough room to do it. Front was no issue.


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 #6 of 10 Old 10-07-2009, 11:45 AM
tankcj
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You should have no problem. We have the same setup. I think my over all length of the CV shaft was 17.5".

'76 CJ7, 401, TH400, QT part time, 33" Baja Claws, 4" Procomp, USA Alloy front and Yukon one piece rear axles, 4.56 gears, Aussie Lockers front and rear, front disc conversion.

2011 2dr Rubicon Auto, AEV 3.5" Premium, PSC Brawler Lite front bumper and skid, Evap skid, Raceline Monster beadlocks, 35" KM2s, 5.13 gears, Trailgater, Expedition One rear Bumper and Tire Carrier, ACE Rock Sliders, Warn Powerplant, ORW trans cooler
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post #7 of 10 Old 10-07-2009, 12:52 PM
CSP
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Even with 4" of lift you're not in the same ballpark as a CJ5 with a T18/D20 with 3.5" of lift. I had that setup and when my wheelbase was stock the rear shaft was 13.5" long.
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post #8 of 10 Old 10-07-2009, 01:32 PM
danheit
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Could always do what I did. I stretched the rear 8" and kept it spring under. Made for a much better ride for stability and control. Pretty easy to do as well.

I NEED A SINGLE 15X8 MICKEY THOMPSON OR SIMILAR ALUMINUM BULLET HOLE WHEEL!!!!

Build Thread: 1979 CJ7 Blue Jeep
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post #9 of 10 Old 10-14-2009, 10:19 AM Thread Starter
Rough85CJ7
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I'll keep pushing on then - thanks for the insight!
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post #10 of 10 Old 10-23-2009, 08:47 AM Thread Starter
Rough85CJ7
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I got most of it put back together! With the degree shims installed and TC drop the difference in angle is almost negligible - thanks to all for your input.

Now just to finish the body........
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