Bought an 88 Comanche on Sunday. Supposedly it has the 4.2 inline 6. But... I am not entirely sure how to confirm this.

Also. It needs a transmission. It has the 5 speed. Not sure if it's the B10 or AX15. What transmissions would be a direct replacement? It is 2 wheel drive. I have a donor 4x4 2001 XJ to do the drivetrain and interior swap. But I would like to go ahead and get the Comanche drivable for now.

Here is the vin if that helps.

1JTMW64P9JT254914

Thanks guys!

 

comanches never had the 4.2. its a 4.0, unless someone swapped in a 4.2 for some reason

 

https://jeep.custhelp.com/app/jeep/e...WGxOMmc2T2w%3D

Go to that site and it will tell you what it came with when you enter the vin. Your may be too old for it to pull but its worth a try.

 

Thanks for the replies!

Is there anyway that I can tell by some numbering on the block or anything like that?

 

There should be a casting number on the block and head.
Is there still an emissions sticker underhood driver side firewall?
Being an 88 you will have the BA10/5.
4.2L of that era were still carb'd IIRC.
PCM is under dash driver side of trans tunnel, there should be some kind of code/markings on that as well.
Take a pic of your engine and post it up.

 

This^^.

 

Here is the transmission and the motor!

Can someone please educate me on the transmission? What would be a direct bolt in replacement?

I haven't looked for any numbers on the block yet. Will do that tomorrow when it's dry and day light!

 

That's a 4L.
Trans I have no idea.

 

BA-10 trans

 

How do you know it's the 4.0 and not the 4.2?

 

Because it's fuel injected and 4.2s never were.

 

If you really want to continue bashing your head against a wall:

4.0 Engine date codes

The date code is on the passenger side of the engine, on the block, just forward and up from the distributor on a machined flat surface.

The digits of the code identify:
 1st Digit-The year (8 = 1998).
 2nd & 3rd Digits-The month (01 - 12).
 4th & 5th Digits-The engine type/fuel system/compression ratio (MX = A 4.0 Liter (242 CID) 8.7:1 compression ratio engine with a multi-point fuel injection system).
 6th & 7th Digits-The day of engine build (01 - 31).
1. FOR EXAMPLE: Code * 801MX12 * identifies a 4.0 Liter (242 CID) engine with a multi-point fuel injection system, 8.7:1 compression ratio and built on January 12, 1998.

 

Valve cover and its fuel injected.

 

Here is my code!

 

So it looks like unless my engine was rebuilt and bored to a 4.2 it is a 4.0!