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post #1 of (permalink) Old 12-09-2002, 07:37 PM
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How long will it last?

1984 CJ7
How much mileage should I expect out of a stock 4.2?
It sat for about 3 years before I got it. The drive line has 110,000 miles on it. The last 4,000 were put on by me and I thought it felt weak, but I am use to a 5.9 as a daily driver. The body is off for painting, so I thought now is a good time to think about a rebuilt. I do want to stick with the 258, any thoughts?
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post #2 of (permalink) Old 12-10-2002, 05:57 AM
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Re: How long will it last?

Before you rebuild, you should really make sure the motor needs it. Do a compression test on the motor. Or better yet a leak down test.
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post #3 of (permalink) Old 12-10-2002, 04:26 PM
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Re: How long will it last?

I wouldn't feel bad freshening up the 258 a little with 110K on the ticker. As stated above, check it out and see what it might need. The 258 is a great little motor and should last you many years if you take care of it.
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post #4 of (permalink) Old 12-10-2002, 06:09 PM
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Re: How long will it last?

I have an 84CJ7 my rebuilt 258 blew a piston I decided to put a 304 in, it's the easiest and cheapest swap going. Then after doing more and more research I found that most ppl who upgraded to a 304 would end up upgrading to a 350 later so I bought a 350 before I even put the 304 in. Ill probablly put the 304 in till I get all my pieces parts together I will eventually end up dumping the 304 for a 350 loose the T176 trans and put in a T18 out of a Ford truck , keep the Dana 300Im puting Dana 44 front and rear although Im probablly going to up the rear to a Dana 60. I have 2-258 motors for sale in my local TradinTimes for 100.00 each and got 2 calls on them no one showed up yet I am constantlly hearing about blown 258's all the time if there such good motors why are there so many bad one's ?
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