YJ Motor replacement

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Mrkevvie - 03 Nov 2007 00:05 GMT

Has anyone replaced the chrysler motor in their YJ with a ford 300
straight 6? If so what did you have to replace, adapt or just reword
entirely?
I have a 95 YJ with a 4 cyl which is on its last legs, I have always
been very impressed with the torque on the 300 and was seriously
considering replacing the 2.5l with the 300. Any input would be
greatly appreciated.

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Jeff DeWitt - 03 Nov 2007 02:29 GMT

> Has anyone replaced the chrysler motor in their YJ with a ford 300
> straight 6? If so what did you have to replace, adapt or just reword
[quoted text clipped - 3 lines]
> considering replacing the 2.5l with the 300. Any input would be
> greatly appreciated.

Do yourself a BIG favor and give this project a serious rethink.

If you want to vonvert to a straight 6 (a noble goal) you would be FAR
better off putting in a Jeep 4.0, not only is it an excellent engine but
the factory already enginered everthing, you don't have to reinvent the
wheel. If you get yourself a parts Jeep with a 4.0 it should have just
about evething you need, if you insist on the Ford engine you are going
to have to come up with brackets, adapters, a custom exaust, and about a
thousand other things.

Lets see...

Motor mounts
Transmission mount
exaust pipes
clutch linkage (if it's a stick)
shift linkage
throttle linkage
radiator hoses (radiator?)

Then you are going to have to connect the engines electronics to the
Jeeps electrical system. Plus what are you going to have to do to the
frame (holes, welding?) to attach the engine mount brackets.

Nothing againts the Ford motor, it's an excellent engine, second best
car I ever owned had one of those engines.

If were to do an engine swap with something other than a Jeep engine you
would be a lot better off even putting in a SBC, that has been done
and all the parts are redeally available. (And I NEVER suggest putting
in a SBC!)

Jeff DeWitt

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Earle Horton - 03 Nov 2007 04:02 GMT

> > Has anyone replaced the chrysler motor in their YJ with a ford 300
> > straight 6? If so what did you have to replace, adapt or just
[quoted text clipped - 40 lines]
> and all the parts are redeally available. (And I NEVER suggest
> putting in a SBC!)

In place of the SBC you can put a GM 4.3l V6 or a Chevy truck inline
six. Check the Advance Adapter catalog for details. The inline 6
performance will be close to what you expect from the 300 cid Ford, with
the advantage of not having to fabricate every part. Transmission: you
need a bigger transmission, even for the six cylinder engine. In the
early Wrangler days Jeep put the AX-5 transmission and similar boxes
behind the AMC sixes, with disappointing results. The V6 has the
advantage of lightness. Another innovative solution that has been
bantered about for some time is a GM small V6, 2.8, 3.1, 3.4 or maybe
even 3.8 liter which should bolt up to your Jeep bell housing, but then
you have to make or find the motor mounts, exhaust, throttle linkage and
all of that anyway. Or you can get the S-10 or Camaro bell housing
which might bolt up to your existing transfer case. Not guaranteeing
anything here, you understand.

The more time you spend engineering at the drawing board, the less you
will spend in the garage trying to make stuff fit and wondering how you
ever talked yourself into it. The first Jeep engine swap I was involved
in took about three years to be completed.

Cheers,

Earle

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Will Honea - 03 Nov 2007 02:58 GMT

You're in for more changes than just the engine. Even if it bolts right up
(which I seriously doubt) the AX5 manual transmission is too light. The
engine is just the start of the mods you'll wind up making to get it back
on the road.

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Will Honea

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