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I blew my 4.0 in my 1991 wrangler. Driving wise (I don't drive it anymore just when it started) it performed fine but just had a loud knocking sound. I assume I am bending one of my pushrods or something along those lines. I was either going to rebuild it or look for another one to swap. What is the compatibility with the 1991 4.0 and the 5 speed manual transmission? What years 4.0's will drop right in? Also what transmissions can I do this with? My '91 does not have the external slave cylinder, and newer ones do which is what I would look for. What years will bolt right up to the 4.0's that fit my 91? Thanks.
 

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Pretty much any 4.0 will bolt up and any tranny offered with it. There are small differences and changes but anything can be adapted to work
 

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I think I would try to find out what is wrong with your engine first, if it is a push rod that's nothing to fix, if you mean a rod knock then that's a bigger deal. How many miles on it? Did it run well before the knock? I guess I'd want to know why you want to change the engine for just a knock if it's just a push rod. Just trying to help.
 
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