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-   -   Diagnosing a Drivetrain Problem? (http://www.jeepgarage.org/f78/diagnosing-a-drivetrain-problem-10288.html)

jbefumo 06-13-2010 08:18 PM

Diagnosing a Drivetrain Problem?
 
A friend recently gave me a '97 Grand Cherokee with 130k on it.
Overall, it's in pretty decent shape (see
http://www.rootwerx.com/Jeep). It had been sitting for two years, and
his recollection was that before he laid it up, a Jeep dealer had told
him it needed work in the front and rear axles (front worse), for a
total of about $1100.00. My thought is that if a dealer (and one in
Southampton at that) was quoting that price, I'd probably be looking
at maybe two or three hundred in parts.

Drove it a very limited distance (< 1/4 mile) to a local mechanic. One thing we noticed is that when you put it in reverse (Full time mode), the engine revs momentarily, then it seems to engage with a bang, before it moves. It
doesn;'t do this in forward. My friend things it's probably the transmission, but I would think it would do it both forward and reverse if that were the case, or would it, necessarily?

In any case, we're going to put it on the lift, drop the trans pan,
and see what might or might not be floating around in there.

So, since neither of us are really savvy when it comes to
transmissions, transfer boxes, or differentials, what would really be
helpful is any advice as to how to go about diagnosing what's going on
with it. i.e,: if it does x, y, and z when in 2-wheel mode, and only
z when in Full-time 4wd, and x when in part-time mode, then it's
probably _____.

Ultimately, I will definitely bring it to someone who knows what
they're doing before I start replacing parts, however, I want to first
determine if I can drive it the 50 miles or so to the nearest expert
without risking additional damage, or if I' should bite the bullet and
trailer it there.

Thanks in advance,

Joe

Chaoul1 06-13-2010 08:20 PM

Re: Diagnosing a Drivetrain Problem?
 
I had that before on my ZJ. I forgot what it was.....Maybe someone will chip in!

jbefumo 06-14-2010 03:55 PM

Re: Diagnosing a Drivetrain Problem?
 
Quote:

Originally Posted by Chaoul1 (Post 221650)
I had that before on my ZJ. I forgot what it was.....Maybe someone will chip in!

Happen to recall if it was a three-figure fix or a four-figure fix? :confused:

jbefumo 06-21-2010 03:29 PM

Re: Diagnosing a Drivetrain Problem?
 
Well, dropped the transmission pan on Saturday, and it was full of pieces of the bands and other metallic debris, so I suppose it's broke ;^)

However, in a particularly fortuitous piece of timing, I just got home with a transmission, transfer case, and an extra engine, for $200. 80k miles, out of a running vehicle with a damaged frame.

Got my first good look at the underside of the vehicle, and it's absolutely rust free - I'm delighted (and amazed). I'd far rather swap a transmission then contend with rotted floors any day!

95_V8_ZJ 07-15-2010 10:24 PM

Re: Diagnosing a Drivetrain Problem?
 
be careful what you wish for.. in a full shop it took me alone (with monster, BK, an very limited detail haynes manual..) 11 hours from lifting it up with bad tranny, to dropping all four tires back on the ground with good tranny..... an then a day later had to do it all again..
CHECK THE AUXILIARY TRANSMISSION COOLER in front of the rad..

by the way 242 I6 or 318 V8??

jbefumo 07-15-2010 11:59 PM

Re: Diagnosing a Drivetrain Problem?
 
Thanks for the tip - will definitely check that. Haven't yet gotten to the Jeep - 2 other OLD pos vehicles have been pre-empting my lift time, but hope to be getting to it in the next week or so.

Engine is the 4.0, which I THINK is different from the 242, though the heads might be interchangeable.

Joe


Quote:

Originally Posted by 95_V8_ZJ (Post 236231)
be careful what you wish for.. in a full shop it took me alone (with monster, BK, an very limited detail haynes manual..) 11 hours from lifting it up with bad tranny, to dropping all four tires back on the ground with good tranny..... an then a day later had to do it all again..
CHECK THE AUXILIARY TRANSMISSION COOLER in front of the rad..

by the way 242 I6 or 318 V8??


95_V8_ZJ 07-19-2010 04:50 AM

Re: Diagnosing a Drivetrain Problem?
 
only 3 motors ever came in a 1st gen grand..
242 cubic inch (4.0 Liter) inline 6

318 cubic inch (5.2 liter) V8

an rare 1 year only (1998) 360 CI (5.9 Liter) V8.. only made like 10K or so..

jbefumo 07-19-2010 07:28 AM

Re: Diagnosing a Drivetrain Problem?
 
Oh, right - what was that other inline 6? The one with the longer stroke that came in the AMC Eagle?

NHWK05 07-19-2010 11:56 AM

Re: Diagnosing a Drivetrain Problem?
 
Your thinking of the old CJ/YJ Wrangler 4.2 I6 which is a 258. They stopped making that in 1989 i think and they were all carb'ed.

jbefumo 07-19-2010 12:16 PM

Re: Diagnosing a Drivetrain Problem?
 
Yup - 258 sounds right.

LipschitzWrath 09-16-2010 11:39 AM

Re: Diagnosing a Drivetrain Problem?
 
What you are thinking of is that the 4.0 (242) cylinder head can be modified to be swapped onto the earlier 258 L6 for an increase in power. As far as inline sixes go, the 4.0 is pretty much legendary. And the cylinder head is a good part of that. The HO version (somewhere around '91 or '92) is the cream of the crop in terms of airflow. You'd have to go to some other inline six like the Ford 4.9L (300) to get better airflow.


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