Re: [AMC-List] My "new" J-10 truck!

["Jim Blair" <carnuck@xxxxxxxxxxx>]

A: I have a '93 ZJ 4.0L and AW4 (it was an early model) in my '84 J10. The 
ZJ front pipe (probably the same as HO XJ) will fit with some tweaking, but 
the Renix manifold and front pipe works much nicer. I had an '87 4.0L in 
there before with the pipe attached and it fit like it was made for it. (I 
pulled the motor back out because my current daily driver needed a swap out. 
I figured it wouldn't run so well in the J10 with 200,000 miles on it 
anyways, but it's been fine in the MJ except blowby)
   I have a high flow cat (Random Technologies) to go on with regular Jtruck 
exhaust the rest of the way (6 and 8 share the rear pipes) I very nearly 
hooked up an XJ clutch master (I was within 20 minutes from having it 
mounted on the firewall. You could still see the outline in pencil I did to 
align it with the FSJ pedal assembly) but UPS lost my high steer linkage and 
RH steering knuckle just before my trip to Ouray in '02, so I had to convert 
my '86 Comanche to 4x4 and lift it 3" for the trip instead. (I have the 
truck back again and the PO wants to sell it for $600, but the 5 speed 4x4 
trans died and we swapped back a 2wd trans. It's somewhere around 300,000 
miles on the clock and no rust yet!)
   Your tire size will be the deciding factor as to what gearing you'll want 
to run. I ran 235/75R15 with my '83 Cherokee (Mexican 4.5L engine) and 2.72 
gears with 999 lockup automatic and I towed a 5 ton (empty) trailer with it 
that I made out of an IH bus and tandem wheel mobile home frame.


From: "Swygert, Francis G MSgt 436 CES/CECM"
	<Francis.Swygert3@xxxxxxxxxxxx>
Subject: Re: [AMC-List] My "new" J-10 truck!
To: <mail@xxxxxxxxxxxx>
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<092D8CF6635129428E9B66DC582C3B3D01A387AD@xxxxxxxxxxxxxxxxxxxxxxxx>
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Date: Sunday, October 29, 2006 09:44 PM
From: Ken Ames <ameskg@xxxxxxxxx>

My J10 has the same trans and gears with a 258. Runs 1900 rpm at
60 in
4th.
Normal city driving uses 3rd a lot. 3rd in my trans is getting
noisey.
I've also used 4lo without locking the front hubs for low speed
maneuvering.
Shifting from lo to hi on the move gets a nasty crunch from the
transfer
case. I wouldn't recommend it as normal procedure. I have a set
of 3.31
diffs from a Cherokee that would help things if I ever get
around to
putting them in. :)
------------------------------

3.31 gears would bring rpm @ 60 up to ~2300, or drop you to 50
mph @
1900 rpm. Not bad, and I know you'd like the better pulling
power. I was
thinking a 3.08 would be sufficient -- ~2100 rpm @ 60. These
things
really don't like to cruise over 2500 rpm stock (65 mph w/3.31
gears),
but of course will. A better cam would help that, but I'm not
planning
on opening the engine anytime soon.  A small 4V would be nice,
and I'll
keep on the lookout for a used one. If I rebuild in 3-4 years,
provided
rust hasn't started becoming an issue, I'll build a 4.0L, maybe
even
another stroker. Might go ahead with a 4.0L exhaust manifold for
now...
need an exhaust system! Couldn't find a vendor with pre-bent
pipe for
sale though. Wanted to put it on myself and skip the cat.

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