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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...

Thanks for the schematic Saddle Tramp but I got rid of all the computer stuff. Went to a HEI distibutor. Back to old school. I will try your suggestion Super J Thanks

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 put a holley 500 on mine and it runs great.

Found my problem. It was the vacum module. Took it out and it shifts fine. I have it up on jack stand so I adjusted the linkage and it works great. Since I converted my front end to a TJ axle and got rid of the vacum crap I replaced the module with a 3/8 pipe plug.

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...

Thanks for the replies. What sucks is that I just bought the whole setup as a rebuild. i will try and get a hold of them on Monday and find out if they will honor their warranty. Especially since it hasn't been on the road yet. If they won't I will definitely be posting not to buy from them.

I converted the front axle to full time and got rid of the vacume set up. Would that module directly above the shift linkage have anything to do with it?

No it won't move at all. i unhooked the linkage and put a wrench on it try and shift it. I have also tried to rock it in 1st and reverse and it still won't move. I purchased the set up fro Manstrans but have not been able to get in touch with the right person.

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.