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I'm looking for an older pickup to use as tow rig/occasional driver. I was looking at some 1970's F250's, but then figured maybe i'd check out a Jeep. Don't know much at all about Jeep trucks. Any clues as to which years/models would be best to look at. I couldn't tell ya a J10 from a J20 from a Doobie Woobie. Thanks.
 

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I have a Jeep truck as a tow rig. Cummins powered 1968 M-715. If you want something easier to find look for a J-20 with a 360 or a 401. A J-3000 (Essentially a HD 3/4 ton) would be a really great score, but they are kind of rare and hard to find.
 

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J20s say J20 on the side, J10s say J10 on the side. J10 is 1/2 ton, J20 is 3/4 ton. J20 has a FF 30 sp d60 while the j10 has either a 1 piece AMC20 or d44 depending on what year you get.

usual drivetrain is a 360 with a 727, th400, or t18a. some of them had 401s 74-78. transfer cases range from quadratrac (with the th400 70s) to np208 (727 and t18a in the 80s) to d20 (t18a - 70s). if you get a 401, the only manual tranny option is a 3 speed t15a. you'd have to swap in a t18a or th400.

J10 WB is either 119" or 131", J20 is 131" only.

any more questions?

good luck
 

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Discussion Starter #4
utahjeepr said:
I have a Jeep truck as a tow rig. Cummins powered 1968 M-715. If you want something easier to find look for a J-20 with a 360 or a 401. A J-3000 (Essentially a HD 3/4 ton) would be a really great score, but they are kind of rare and hard to find.
I'd love find a M715 with an updated driveline, but I don't see too many of those around, which is why i was looking towards a J truck.

thanks for all the info willypete
 

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Honkylips said:


I'd love find a M715 with an updated driveline, but I don't see too many of those around, which is why i was looking towards a J truck.
Usually you have to find the 715 first then update the drivetrain yourself.;) You can always get the J truck them convert IT to a Cummins later.:D
 

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I have a 1978 Jeep technical manual and it only lists the T-18 with the 258 and 360. I think the 401 was only available with the TH400/QT combo. I don't remember ever seeing a stock FSJ with a 401 and a T-18.

As far as using an M715 as a tow rig, unless you REALLY want a M715, I would say that a J20 would be a far more user friendly option. Congratulations on choosing a FSJ!:D :D
 

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Just checked my 75 TSM, and it lists the 401 with t-18 as standard in the 131" wheelbase J-20. The auto/quadratrac was an option. Everything else that could get the 401 that year had the auto as standard equipment.
 

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I use a 77 J10 as a tow rig. I've got the base 131" WB model with the 258 I6/T15. It works flat towing my CJ5, but is fairly slow. I've got a set of J20 axles lined up (44/60 w/4.10) and I am in the process of getting a 360 to swap.

If you can find one without too much rust, they work just fine for towing.
 

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I am in the process of doing the same thing.. I just recently picked up a J-20 with 35k original miles. It is in great shape just needs a paint job. I am in the process of adding a few minor improvements to improve its towing power.

TFI upgrade
Headers
Flowmaster or super turbo muffler. Already has new Meineke exhaust. Im just gonna swap cans and add a new high flow or gutted cat.

Eliminate Emisions crap. Mine is a 1981 it has a ton of emissions crap that robs horespower.

My truck was used in a firestation. It has little rust and it is in good shape.

I dig the old J-trucks and FSJs. It should make a decent tow rig and good Home Depot rig.

Check out Ifsja.org for a ton of good info.

good luck

RK
 

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