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Old 07-30-2006, 03:59 AM   #1
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Sleepless in Seattle

My son has a 1990 Wrangler YJ, and I have a 74 IH Scout II. No scout bashing now... My son is in college and took an intern job in the Midwest. I wanted to surprise him and get the annoying lifter clack outta his motor, but was told by the mechanic it was a bearing going bad. So I am on the trail to get the motor replaced. I am moving overseas, and do not want him left with a car that may or may not last thru the winter. Here are the questions I have for the experienced jeepers.

How do you tell if the motor is a 4.0/4.2 and can u put either in there if I find one?

What year motors will fit into this thing, and is there a year that is better then others?

Also noticed that the YJ/TJ crossed over on years, how do I tell what we got here. My son is the expert, but I haven't decided if I am going to let him in on his baby falling apart yet? ( I know bad Dad ). Although I may just take this one and part it out and get another one... newer stronger faster...

What is the best year Wrangler to get? Between the AX15 tranny (Peugeot, as an ex-sailor I hate the French), and the 4.0 /4.2 / 4cyl (what’s up with that) fiascos, and the newer ones without leaf springs, I am not sure which ones are better than others. I am sure you all are not short on opinions, but plz leave the Scout alone...

Thank you
Kevin

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Old 07-30-2006, 11:21 AM   #2
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You can usually tell from the VIN. Find a Chilton's or a Hayne's manual and the introduction section will tell you how to interpret the number.

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Old 07-30-2006, 01:36 PM   #3
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Quote:
Originally Posted by kwick
My son has a 1990 Wrangler YJ, and I have a 74 IH Scout II. No scout bashing now... My son is in college and took an intern job in the Midwest. I wanted to surprise him and get the annoying lifter clack outta his motor, but was told by the mechanic it was a bearing going bad. So I am on the trail to get the motor replaced. I am moving overseas, and do not want him left with a car that may or may not last thru the winter. Here are the questions I have for the experienced jeepers.

How do you tell if the motor is a 4.0/4.2 and can u put either in there if I find one?

1) The 4.2 has a carb the 4.0 has EFI

What year motors will fit into this thing, and is there a year that is better then others?

2) All 4.0 and 4.2 have the same blocks soall the bolt holes are the same. I have an 89 and replaced the engine with a 98 4.0 by myself in a week it is not that hard to do. I did change the 98 to 96 sensors and a 96 computer as the 98 is OB2 and the 96 set up is OB1 and much easier it figure out all the wiring.
Also noticed that the YJ/TJ crossed over on years, how do I tell what we got here. My son is the expert, but I haven't decided if I am going to let him in on his baby falling apart yet? ( I know bad Dad ). Although I may just take this one and part it out and get another one... newer stronger faster...

3) 95 was the last year of the YJ.

What is the best year Wrangler to get? Between the AX15 tranny (Peugeot, as an ex-sailor I hate the French), and the 4.0 /4.2 / 4cyl (what’s up with that) fiascos, and the newer ones without leaf springs, I am not sure which ones are better than others. I am sure you all are not short on opinions, but plz leave the Scout alone...

4) Best year YJ is a 95 as they changed to front axle shafts to the same size u-joint as the D44. Stay away from the Peugeot it is junk. As far as the Scout I couldn't care less as long as you wheel
Thank you
Kevin
HTH and good luck
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89 YJ Nearly Stock Dual D30's front and rear
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Old 07-30-2006, 06:46 PM   #4
coilovers are damn flexy
 
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Very well put, Hackle.............very nice job of answering all his questions.
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Old 07-31-2006, 10:45 PM   #5
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Thanx for the help Hackle.. going to put another motor in it..

Is the normally asperated, or the fuel injection better for the bigger tires? It has 35" mudders on it now, with a 5 inch lift.

Once again thanx, Kevin
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Old 08-01-2006, 06:40 AM   #6
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Fuel injection is the way to go. It runs better in just about every situation. Especially in an off road vehicle. A carb can starve for fuel when the jeep is on extreme angles.
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Old 08-01-2006, 05:29 PM   #7
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Quote:
Originally Posted by kwick
Thanx for the help Hackle.. going to put another motor in it..

Is the normally asperated, or the fuel injection better for the bigger tires? It has 35" mudders on it now, with a 5 inch lift.

Once again thanx, Kevin
The bigger question is which is better for Off highway travel.
I rock crawl and the carb sucks at angles or altitude. The best most enjoyable mod I have done is the engine swap to a fuel injected engine. BTW I only run 40" tires

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