How hard to swap a 4 for a 6?

Dec 29, 2005 10 Replies

Hi again,



I am looking at some really clean YJ's whose only shortcomings are their 4 cyl powerplants. Are there any differences in the rest of the powertrain from a 4 to a 6 cyl. Jeep? Any suspension differences? I guess basically what I am asking is, if I buy the beautiful little Jeep with the 4 banger, can I drop in a new 6 cyl motor later without having to change tranny's, springs, etc.?



Thanks, Dan Hoskin


t-case, too. # of input splines are different.

Carl

Just buy one with a 6 banger you will be money a head, happier going up hills, going off road. It is sort of buying laundry soap with out having a washing machine.

Coasty

Just buy one with a 6 banger you will be money a head, happier going up hills, going off road. It is sort of buying laundry soap with out having a washing machine.

Coasty

Why not put a V6 in there and keep a shorter transmission?

Bret Ludwig did pass the time by typing:

I'd suspect the tranny won't hold up well. Probably won't bolt up either without some interesting adapter work. That and the ratios are designed around the 4.

I have read that the AMC I-4 sports the same bell housing pattern as the GM V-6 2.8 litre family. Starter location may be a problem, but you should be able to bolt up a V-6, if you are clever enough. The larger 4.3 litre V-6 will not fit, as it shares the same pattern as the GM V-8s and the old inline 6.

The 4 cylindre transmission should be able to handle a small V-6 engine, but when you count up the work needed and the anticipated performance gain, it may not be worth it. On the other hand, if you needed a replacement I-4, it might be hard to find and/or expensive. If you had an appropriate V-6 and all the accessories at hand, then this might be a worthwhile swap. It is amazing what people will do, to make use of marginally appropriate spare parts.

Earle

A six it is then..... Thanks, Dan Hoskin

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