carnuck

adjust a 1/4" more toe-in

"91/'92 ZJs are only found with the '96 TJs. :popcorn: Spline count changes are '87 to '90 21 spline and '91 up 23 spline (they swirled the splines in the late '90s) I put an AW4 and NP242 in mine (and it'll be finished hopefully end of this week while I have access to a garage!)

Try a 3.73 diff temporarily

WOT?

I really liked FSJ magazine. Wish they were still around.

Rotor may need resetting in the dist.

Could be the IAC is going bad

Only about 1" lower

Cherokee 4 dr driver's door is the same. I would move the inside lock button a couple times first to be sure it's not just out of synche

I'm doing this swap myself. My question is the firewall pinout differences between an '87 with BA 10/5 and a '90 XJ 4.0L with AW4. I got rid of the C101 connector but didn't think is there was a firewall pinout difference and I'd like to know before I put a battery in the truck in the next couple weeks.

Check the vacuum hose between the MAP sensor and intake. Then get a can of electronic cleaner spray and spray the TPS (if it improves immediately, it's going bad but mine worked better for a year after I did that), Check the CPS connector and use the spray on that too (do all the underhood connectors and try it one at a time till you get the one that makes it better)

I had to clean the throttlebody on mine

In the user control panel there is subscription options. I set mine to subscribe for whatever I post on.

pump it for compression

It's stronger than the factory one.

Width wise, but the front driveshaft is passenger's side until 1980

Try unplugging the iac after you get the RPM down to near normal.

A lot of times NatGas becomes unavailable in those situations. I have a 4D truck battery for backup and LED lights (that run on 12VDC) so I can just fire up the car and attach jumper cables to the shed to recharge (or get a car going if the battery is dead) I have a 5500W genset that is getting converted to LPG once I sell my Chev pickup.

Double check by switching #2 AND #3 at the cap and see if it runs better.

She's making a cozy for it! :clapping: :jump:

21 vs 23 spline with 08/90 being the break point in automatics EXCEPT the 3 speed auto used 84 to 86 was only available with a short 23 spline. AX-15 came on board part way through '89 with 23 spline.

Is the tag missing from the front diff?

If you go '80 and newer FSJ except the truck you'll get the correct width

Mine will just be an extended cab.

My youngest son is over 30!