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  #1  
Old 08-09-2017, 07:11 PM
Sunbeam Fanatic Sunbeam Fanatic is offline
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QuadraTrac and rear LSD

Hi All,

I was planning on fitting an LSD in the D44 rear axle of my 1980 Cherokee Chief 2 door. The theory being that the QuadraTrac controls power sent to front and rear axles and the LSD would then control power sent to each wheel on the rear axle.

However, I've seen a couple of comments on one of the FaceBook Jeep pages where it has been said that the QuadraTrac doesn't work well with an LSD installed in the axle.

Is this correct, will there be any conflict in the operation of the QuadraTrac with an LSD installed?

Many thanks.
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  #2  
Old 08-09-2017, 07:49 PM
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J20 project J20 project is offline
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Weird that your 80 has a 44..mine had a amc 20....anyway..
Put the LSD in and get going.....


J20
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  #3  
Old 08-10-2017, 09:36 AM
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tgreese tgreese is offline
 
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An '80 should have the faux Quadratrac (NP219) and a AMC Corporate axle, unless it's really a '79...
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk
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  #4  
Old 08-11-2017, 07:34 AM
yossarian19 yossarian19 is offline
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I've heard of issues with a front LSD in an AWD transfer case. Because the front is always powered in a Q-trac and the outside tire has to turn faster than the inside when you are steering, you run into issues - the LSD will make it steer hard at lower speed / higher angles and you can chirp the tires, etc. No firsthand experience but it makes sense. I don't see why you'd have any problem in the rear.
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  #5  
Old 08-12-2017, 11:49 AM
Sunbeam Fanatic Sunbeam Fanatic is offline
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Quote:
Originally Posted by tgreese
An '80 should have the faux Quadratrac (NP219) and a AMC Corporate axle, unless it's really a '79...

It's a UK RHD model built in 1979 but registered in 1980 with a 360/TH400/QT/Dana 44.
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  #6  
Old 08-12-2017, 11:51 AM
Sunbeam Fanatic Sunbeam Fanatic is offline
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Quote:
Originally Posted by J20 project
Weird that your 80 has a 44..mine had a amc 20....anyway..
Put the LSD in and get going.....


J20

1979 built but registered in 1980 :-)
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  #7  
Old 08-12-2017, 11:52 AM
Sunbeam Fanatic Sunbeam Fanatic is offline
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Quote:
Originally Posted by yossarian19
I've heard of issues with a front LSD in an AWD transfer case. Because the front is always powered in a Q-trac and the outside tire has to turn faster than the inside when you are steering, you run into issues - the LSD will make it steer hard at lower speed / higher angles and you can chirp the tires, etc. No firsthand experience but it makes sense. I don't see why you'd have any problem in the rear.

Yeah, I'd heard the same about the front steering when using and LSD. I was wondering if I could use and electric locker at the front only for use in case of emergency!
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  #8  
Old 08-12-2017, 12:56 PM
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Don S Don S is offline
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Quote:
Originally Posted by Sunbeam Fanatic
It's a UK RHD model built in 1979 but registered in 1980 with a 360/TH400/QT/Dana 44.
..

I had the Detroit (mechanical) LSD (not a locker) in my 1976 with a 401/TH400/QT/Dana 44.
It worked great!

Do it.. Don S..
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  #9  
Old 08-13-2017, 04:37 PM
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PlasticBoob PlasticBoob is offline
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Don't know about limited slip compatibility, but I've been running an Aussie Locker in the rear for years with no issues. Seems like a limited slip differential wouldn't be an issue at all.
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  #10  
Old 08-15-2017, 01:47 AM
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Brynjminjones Brynjminjones is offline
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I don't really know if it's any help, but our 1997 ZJ has an NP249 (AWD) with a rear LSD and we have zero problems (apart from the failing viscous coupling).
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  #11  
Old 08-15-2017, 10:29 AM
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tgreese tgreese is offline
 
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Quote:
Originally Posted by Sunbeam Fanatic
It's a UK RHD model built in 1979 but registered in 1980 with a 360/TH400/QT/Dana 44.

Huh. In the USA, the year of registration does not affect the "year of production" or "model year." Production of the 1979 model would have started mid-summer 1978, to build enough inventory to provide all the dealerships with their requested inventory of the new models in September. The new models were "released" at a strategically-chosen date in September typically. In most cases, dealerships typically would clear out the previous model year to make way for the new models, so it would be unlikely that a new 1979 would remain in the dealership inventory until 1980.

What really matters is whether the VIN starts with "J9" or "J0" - a 1979 model or 1980 model respectively. Hard to say how that impacts the features of export models. I suspect this Jeep is a "1979" and registration in 1980 is just an artifact of the export lag.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk
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  #12  
Old 08-22-2017, 02:04 PM
Sunbeam Fanatic Sunbeam Fanatic is offline
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VIN is J9A17NN135444 so definitely 1979, do you know what the rest of the numbers & letters mean?


Quote:
Originally Posted by tgreese
Huh. In the USA, the year of registration does not affect the "year of production" or "model year." Production of the 1979 model would have started mid-summer 1978, to build enough inventory to provide all the dealerships with their requested inventory of the new models in September. The new models were "released" at a strategically-chosen date in September typically. In most cases, dealerships typically would clear out the previous model year to make way for the new models, so it would be unlikely that a new 1979 would remain in the dealership inventory until 1980.

What really matters is whether the VIN starts with "J9" or "J0" - a 1979 model or 1980 model respectively. Hard to say how that impacts the features of export models. I suspect this Jeep is a "1979" and registration in 1980 is just an artifact of the export lag.
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1979 Cherokee Chief 2 door
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AMC401 - GM4L60E (uprated)
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  #13  
Old 08-22-2017, 03:01 PM
tgreese's Avatar
tgreese tgreese is offline
 
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Quote:
Originally Posted by Sunbeam Fanatic
VIN is J9A17NN135444 so definitely 1979, do you know what the rest of the numbers & letters mean?

Sure. Check out the 1979 TSM here - http://oljeep.com/edge_parts_man.html - all will be revealed.

Off the top of my head,
J Jeep
9 1979
A automatic transmission
17 model 17 wide track Cherokee
N sure it's not an M? M is 6250 GVWR
N 360 2v
135444 sequential serial number of all production in the 1979 model year
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Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk
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