78 cherokee chief 360 4bb th400 WHAT GEARS???

[JAMESMOST]

Just purchased, will arrive Ina week,,,,
Posted more pics and info in general section
Quadratrac BW,,, 81k original miles.

So why gears are in my Diffs ?
Any way to get factory build sheet ?
Will the owners manual have all info?

Thanks James

[FSJunkie]

Tag on the differential says what it is.

[tgreese]

Probably 3.54s.

My '77 book says 3.54 std, 4.09 opt for a Model 17. '78 is probably the same.

Check the axle tag, front or rear.

Owner's manual does not have much beyond how to use the dashboard knobs. You want the factory service manual http://www.bjsoffroad.com/prod-673.htm - this is your single best source for info about your Jeep.

Chrysler has some mechanism for getting a "build sheet" but those here that have gone through it got back laughable results. It was a mix of new and old features, some of which were not available till years later.

[JAMESMOST]

Probably 3.54s.

My '77 book says 3.54 std, 4.09 opt for a Model 17. '78 is probably the same.

Check the axle tag, front or rear.

Owner's manual does not have much beyond how to use the dashboard knobs. You want the factory service manual http://www.bjsoffroad.com/prod-673.htm - this is your single best source for info about your Jeep.

Chrysler has some mechanism for getting a "build sheet" but those here that have gone through it got back laughable results. It was a mix of new and old features, some of which were not available till years later.

Cool,, thanx,,, gonna wait till fsj is delivered PO said he put all receipts and books he had in vehicle,,,,may come with,,,,,
I know nothing about the systems,, high low Quadratrac ,,,, lockers , always locked etc,,,
So any quick info appreciated,,,,,

I have an xj that I use for work,,,bty

[tgreese]

Probably 3.54s.

My '77 book says 3.54 std, 4.09 opt for a Model 17. '78 is probably the same.

Check the axle tag, front or rear.

Owner's manual does not have much beyond how to use the dashboard knobs. You want the factory service manual http://www.bjsoffroad.com/prod-673.htm - this is your single best source for info about your Jeep.

Chrysler has some mechanism for getting a "build sheet" but those here that have gone through it got back laughable results. It was a mix of new and old features, some of which were not available till years later.

Cool,, thanx,,, gonna wait till fsj is delivered PO said he put all receipts and books he had in vehicle,,,,may come with,,,,,
I know nothing about the systems,, high low Quadratrac ,,,, lockers , always locked etc,,,
So any quick info appreciated,,,,,

I have an xj that I use for work,,,bty

The Jubilee Jeeps page on the Quadratrac is a good start. http://www.jubileejeeps.org/quadratrac/

There is a '76 FSM here http://oljeep.com/edge_76_tsm.html that will be pretty much the same as '78. There will be changes - I'd expect model info, electricals and emissions to have evolved from '76 to '78, but the major systems are basically the same.

[ghcoe]

The quadratrac has a "emergency drive" use only in emergency. I had a long time Jeep tech tell me that if I want to save on the cone clutch gear ware to go ahead and switch to "emergency drive" anytime I am on loose stuff. Just a tip to pass on.

[JAMESMOST]

The quadratrac has a "emergency drive" use only in emergency. I had a long time Jeep tech tell me that if I want to save on the cone clutch gear ware to go ahead and switch to "emergency drive" anytime I am on loose stuff. Just a tip to pass on.

What does engaging "ED" do????

What are the QT settings ?
High , Low , ED?
Are hubs locked all time ?

[JAMESMOST]

The quadratrac has a "emergency drive" use only in emergency. I had a long time Jeep tech tell me that if I want to save on the cone clutch gear ware to go ahead and switch to "emergency drive" anytime I am on loose stuff. Just a tip to pass on.

What does engaging "ED" do????

What are the QT settings ?
High , Low , ED?
Are hubs locked all time ?

Got it,,, just read the quadratrac pages,,,,,,

Hope I have the low low range unit

[tgreese]

The quadratrac has a "emergency drive" use only in emergency. I had a long time Jeep tech tell me that if I want to save on the cone clutch gear ware to go ahead and switch to "emergency drive" anytime I am on loose stuff. Just a tip to pass on.

What does engaging "ED" do????

What are the QT settings ?
High , Low , ED?
Are hubs locked all time ?

Got it,,, just read the quadratrac pages,,,,,,

Hope I have the low low range unit

Easy upgrade if you don't have one.

[JAMESMOST]

Where does one get a low range unit ?..

[tgreese]

Where does one get a low range unit ?..

Parts ads here or on IFSJA. Advertise. WTB board here or on IFSJA. Look for Quadratrac-equipped Jeeps in local junkyards. http://www.car-part.com Generally be resourceful.

[JAMESMOST]

Just found out from PO that my fsj has
Both high and low gearing, 2" factory hitch,,,
And
Her name: BUFORD

[fulsizjeep]

Hi James, on the QuadraTrac, the low range is a bolt option. Many more came with it than without. There is a small flag shifter on the drivers side of the tranny hump right at the front of the seat. It shifts like this: All the way down, High range - All the way up, Low range - In the middle puts the tcase in Neutral. Just in case: For those familiar with CJ7 with QT, they are opposite on the shift locations.

The Edrive is a different animal and shifted by a vacuum switch in the glove box. Edrive locks the QT limited slip differential. Normal mode sends power through the limited slip.

All of the wide track Cherokees I have ever looked at closely had 3.54:1 axle gears.

There is a link to good QT info in my Signature for more QT fun. There is a 1977 QT TSM available for download there also.

flag shifter:


Edrive shifter:


Low Range unit on the bench:


Low Range mounted on QT:


QT with PTO plate on it instead of Low Range unit:

[JAMESMOST]

Awesome info .....I've done some reading in jubilee ...I'll have to look for the tsm....

What is the desired lubricant for the QT? Do u add a friction modifier? ??

Thanks - James

[fulsizjeep]

Welcome! You can't get Borg Warner QuadraTrac spec fluid from Jeep anymore so I use Crown TCL1 fluid. Some folks have been brave to mix their own batch with 30W non-detergent motor oil and a friction modifier.

[carnuck]

Most of the ones I've seen around here were 3.08 gears.

[haminawag]

I'm no FSJ expert, but I have found several build sheets inside of cars: My Fury had its build sheet under the rear seat springs. I found one for a '71 F-250 taped to the top of the glove box. Another one was found stuffed up inside the drivers seat backrest under the seat cover vinyl, that was on an '81 Tercel. A friends '78 Malibu had its sheet under the rear carpeting.

There doesn't seem to be any rhyme or reason, so keep your eyes peeled and you might get lucky. I always scrutinize every little scrap I find in a keeper vehicle, that's how I found my Furys "Plymouth Dealer Certi-card", it doesn't mean much, just kind of a neat link to the past.

[JAMESMOST]

Probably 3.54s.

My '77 book says 3.54 std, 4.09 opt for a Model 17. '78 is probably the same.

Check the axle tag, front or rear.

Owner's manual does not have much beyond how to use the dashboard knobs. You want the factory service manual http://www.bjsoffroad.com/prod-673.htm - this is your single best source for info about your Jeep.

Chrysler has some mechanism for getting a "build sheet" but those here that have gone through it got back laughable results. It was a mix of new and old features, some of which were not available till years later.

I have a 17 vin.

[nc wagoneer]

Most seem to have come with 3.54's I've never seen a qt with 4.09's

Sent from my Motorola Moto X

[JAMESMOST]

Most seem to have come with 3.54's I've never seen a qt with 4.09's

Sent from my Motorola Moto X

3.54 is a tall first gear,,,,