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Old 03-15-2014, 08:39 PM   #1
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Yj 2.5 to4.0

Hey guys I have been doing a lot of reading. Lots of mixed reviews. I have a 95 yj with a 2.5. And a 4 inch lift on 33s. I bought a doner 91 yj with a 4.0 can I swap computers and have my Gauges still work? I know about the motor mounts. Also will my drive shafts from the 2.5 work will the 4.0 trans/transfer case? Any advice would be appreciated thanks guys

Dallas

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Old 03-16-2014, 05:24 PM   #2
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The only problems I can see will be the tach (4cyl and 6cyl not compatible) and because of that the speedo as well.

In the 95 the tach/speedo are an all in 1 housing. Meaning the wires get plugged into the tach side and they power both gauges. The 91 are separate I think (not sure). The rest of the gauges are the same in both years and both motors.

The drive shafts should be the same. There is only a slight difference in length between an AX5(4cyl) and an AX15(6cyl) and the t-case is the same externally. So the drive shafts should work.

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Old 03-16-2014, 06:04 PM   #3
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Thanks! I got the 4.0 engine, trans, wires and transferase out today. Going to cut the moter mounts out Tommrow and scrap the old jeep. So in theory the computer and wires should plug right into my 95 jeep and only my speed otometer won't work?
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Old 03-17-2014, 07:41 AM   #4
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You will want to use the the driveshafts from the donor vehicle. The AX15 is longer than the AX5. This causes your existing front driveshaft to be too short. Your rear DS will be too long. It's only an 1" or so, but that's enough. Hold them side to side after you pull all the driveshafts, and you will see that they were a different length from the factory.
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Old 03-17-2014, 05:20 PM   #5
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Ok thanks !
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Old 03-17-2014, 09:00 PM   #6
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Pull you're speedo and tach from the donor , If OIIIOForlife is right,, He is ,, The donor jeep tach and speedo will fit you're 95 and read the Donor computer and sensors making the speedo and tach work , Also , I wouldn't scrap the Jeep.. There's not a part on it that won't sell , and they don't weigh enough to make any money @ 10 cents per 100 lbs anyway.. I'll give you more for what you don't use than they will..."If you're anywhere close to S.C...
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Old 03-17-2014, 09:58 PM   #7
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Thanks mad mudder I took the old gauges and plan on putting them in I took everything of value off the jeep and scrapped the frame and tub because they were so rotten I wouldn't even sell it to anyone. And I'm in jersey probably not worth the ride for the parts haha
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Old 03-20-2014, 09:02 PM   #8
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You get a lot of salt on the roads where you are don't you ? That's probably why so much rust ? I don't blame you I would have done the same thing ...

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