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jeepermatt 06-24-2013 12:46 PM

88 6cyl into 92yj?
I have a opportunity to buy a straight 6,trans,and transfer out of a 88 cj.what do i need to know about putting this into my 92 yj? I am guessing i can eliminate the ecm if i do this,but will my guages and fuel sending unit work?

Mbclark 06-24-2013 12:54 PM

I'm assuming you meant 88 YJ not CJ. It'll be a big project and a computer from a 87-90 will most likely be needed. Why would you consider going backwards in technology instead of a 4.0?

jeepermatt 06-24-2013 12:58 PM

Sorry...yes its a yj...i wanted a carburetor instead of fuel injection...wanted to eliminate most sensors

89Saharagreen 06-24-2013 01:03 PM

It's his Zombie Apocalypse vehicle!

Go for it!

Mbclark 06-24-2013 01:05 PM

I know in CA we can't go backwards in years for smog reasons, not sure how FL is with that. I know I would stick with Fuel injection if possible. If you can go with the older 6 your going to have to go bare bones like a old CJ.

0III0forlife 06-24-2013 01:13 PM

The 87-91 YJ's came with an ECM. Its mounted on the back side of the driver's inner fender, down below the coolant tank.

If you switch to this drivetrain, you can do a nutter bypass, but you need the PCM from the donor vehicle. The one from yours isn't compatible. And as you thought, you will lose the use of your gauges.

Seems to me like a lot of work to go back in technology. Fuel injection is much better than a carburetor any day of the week, and although the older YJ has a 4.2L motor, it doesn't compare with the horsepower and torque of the newer smaller 4.0L.

jeepermatt 06-24-2013 01:43 PM

So ya think i should go with everything outta a cherokee?

Mbclark 06-24-2013 01:58 PM

What are you currently running?

Cashcrazy 06-24-2013 02:26 PM

You might be better off cost wise selling your jeep and getting one with the 4.2.

jeepermatt 06-24-2013 02:29 PM

And i apologize, its a 85

jeepermatt 06-24-2013 02:41 PM

Currently is the 2.5 four banger in a 92 yj 5 speed

Mbclark 06-24-2013 04:07 PM

Put a throttle body spacer and drop the gearing in the diffs to 4.88, I've known a few people who swapped a 4 for a 6 and said the time/money wasn't worth the power gains.

I had a 94 with a 2.5 and loved it. Decent power after I re-geared and good mileage. I could do the whole Rubicon on one tank of gas while my buddies with 6 cyl's had to carry extra gas.

jeepermatt 06-26-2013 04:20 PM

Cool...just ordered the 4.88's today .throttle body spacer should be by friday

StanF 06-27-2013 08:09 AM


Originally Posted by jeepermatt (Post 3902183)
Cool...just ordered the 4.88's today .throttle body spacer should be by friday

What size tires do you have?

Hint: Fill out your profile, so we know what tires, etc you have

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