Topic: In laymen's terms please

[Islander]

What TB/Intake upgrades can be done to a pre 91' 2.5L YJ.  What years and parts swap to a  pre 91' - if any.  I've read about 6 dozen 4.0L TB swaps threads and how-to's, and none of them are clear (enough for my thick head anyway) about specific years needed or compatiblity.

So - how can I get more fuel/air into my 2.5L.  Anything from junkyard tricks to off the shelf speed parts - P/N's are always best.

[Jeffy]

Those are MPFI 4.0L TB's.  There are no injectors in the TB, that's the dead give away that it will not work.  Not to mention the bolt pattern for a pre-'91 is a 3 bolt pattern and not the more common 4 bolt pattern.

I've heard of some people using a TB from a 4.0L Renix TB but I'm not certain if it will work.  I've also heard of some people using TB's from older TBI Chevy V6's.  But with a TBI swap, you'll probably increasing the injector size also.

Anything can be done with some tinkering though you might need to have a drill press. :wink:

[Islander]

So no aftermarket or commonly known junkyard bolt in swaps for pre-91 2.5L YJ's is what you're saying.

[Jeffy]

Well, the easiest way to match a TB is with the gasket.  That's how we figured the 4.0L TBS fit the 2.5L. (year before the whole 4.0L craze.)

[Islander]

So that's a no?  Yeah it fits the 2.5L, but not pre-91 - In perfectly simple terms - the answer is no, correct?