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Did a 4.0 head swap onto a 4.2 engine. Installed a new 4.0 head gasket. I also installed an aftermarket comp cam with a higher lift and duration. Do not have any compression now. Two questions. 1. Are the pushrods on a 4.0 and 4.2 different lengths? Do they need to be replaced? 2. Are...

I have a 88 4.2 with three burnt valves. After pricing out everything I am looking at upgrading to a 4.0 head. I know there are modifications to make (water jacket and brakets) but what I haven't been able to determine is will any 4.0 head fit or only specific casting #'s or years. i...

I have an 88 yj with the stock 4.2. I had a Holley 500 on it but it was just too big. So I got the wild idea to switch it out with a Rochester monjet. The only problem that I have is trying to figure out how to hook all the vacum lines. Anyone have any ideas.

I have an 88 YJ with a 4.2. Currently working on a rebuild. Since I live in an area that doesn't have a vehicle inspection and my jeep will be primarily offroad I decided to remove the ecu/elctronics and go old school. I have ran into a problem with a thin blck/brown wire that comes off the...

I just swapped out my peugeot with an ax 15 and np231. Having problems with the shift on the t/c. My jeep is an 88 and the pattern was alway forward was 2H, down for 4H, down for nuetral then right and down for 4L. I just read on the forum that the shift could be as simple as that every...

Hi everyone. I have an 88 yj with a 4.2. Just did an upgrade to a rebuilt ax15 and np231. After installing the transmission shifts fine but the t/c is stuck in 2 wheel hi. I cannot get it to move. I have looked at pics on the web and all show the linkage straight up at the t/c for two wheel...

Can anyone tell me what the size and thread count is for a pitman nut on an 88 yj. Or who carries them. i had to cut mine off to replace the pitman arm.