Re: 4.0L basic Intro

["Jim Blair" <carnuck@xxxxxxxxxxx>]

A: Acording to Chrysler news, the 4.0L will be going away in '07. My '87 
with 5 speed has the big plug and so have the other '87/88s I've had/looked 
at. I've hauled a few 1500lb plus loads (some in the truck and some on a 
trailer) with my 2wd BA 10/5, but it was rebuilt by Jeep about 10 years ago 
(cost the guy @$1500 too!)


From: farna@xxxxxxx
Subject: Re: 4.0L basic Intro
To: mail@xxxxxxxxxxxx
Message-ID: <ADVANCES62LTiImUnRE00001b78@xxxxxxxxxxxxxxxxxxxxxxx>

Just a couple comments on Jim's (very good!) XJ/4.0L post:

1. The 4.0L is still in production for the Wrangler. It's just not used in 
the Liberty or Grand Cherokee.

2. 87-88 stick shift models don't have the big connector in the wiring 
harness. At least the 87 I pulled my first 4.0L from didn't (five speed 
model, trans was already gone).

3. 87-95 AW-4 models have a separate tranny controller under the glove box. 
It's mounted on the plastic "knee panel". 96+ models use a PCM (Powertrain 
Control Module) instead of an ECM (Engine Control Module). The PCM has 
tranny and cruise controller combined with the ECM into one unit. Some 
gauges get their input from the PCM instead of separate sending units. Just 
leave the gauges disconnected and use separate senders for a swap.

4. Renix units get all speed, timing, and crankshaft position information 
from the CPS, later units just get timing and position info from it. The 
difference is the flywheel/flexplate. Renix has notches all around, later 
has a set of 3-4 notches every 120 degrees. Flywheels/flexplates and sensors 
can't be interchanged. Renix uses an induction coil pickup, later a Hall 
Effect switch (magnetic switch). If you change to a balancer CPS you have to 
have the right one for your system. AFAIK HESCO is the only source for Renix 
balancer CPS kits.

5. As Jim stated, the early five speed (Peugeot BA 10/5) used with the 4.0L 
is a bit on the weak side for trail work. But it's fine for a street vehicle 
that sees only light trail work, mainly rough roads, and no heavy loads. In 
other words, it's fine for yuppies! If you find one in good condition the 
vehicle hasn't been worked hard, so should carry on fine. If you or your 
daughter plan on using it for a tow vehicle or to do some real off roading, 
look for the AX 15.

On July 4, 2005 Jim B wrote:

> All the years of XJ/MJ/TJ/ZJ and late YJ with 4.0L have their good/bad
> points '87 to the end of 4.0L production (good points to know for for 
> engine

> swaps too).