258/300/302/304 - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

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post #1 of (permalink) Old 09-04-2001, 02:26 PM
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258 getting old and tired (88 YJ, MC2150, MSD6A, Peugot tranny). Let's say I cannot afford more than $1,000. If you all had your druthers, what would you do - restore the 258? How about dropping in a 300 I6 (4.9L), a 302 V8 (5.0L)? What about the AMC 304? I've read hundreds of posts comparing some of these (258 vs. 300; 300 vs. 302), but I'd like to hear from all the "masters".

88 YJ Sahara, 258, TR TFI, MSD 6A, stepper motor bypass, Motorcraft 2150
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post #2 of (permalink) Old 09-04-2001, 03:59 PM
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Re: 258/300/302/304

An amc motor would be the easiest swap(It will bolt right to your trans) but the peugot trannies are notoriously weak. For 1k you could get the 258 rebuilt and basicly have a new engine. If your motor runs well but is getting weak due to wear and loss of compression I would just freshen it up. I did the 5.0 swap and love the power but it is really not needed.

5.0s and 4 speed = lots of broken parts!!!
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post #3 of (permalink) Old 09-04-2001, 05:00 PM
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Re: 258/300/302/304

For $1000, you are limited to rebuilding the 258 unless you don't care about the condition of the engine/tranny you install. It always costs more than you'd think to do a conversion. Brendan

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post #4 of (permalink) Old 09-04-2001, 05:38 PM
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Re: 258/300/302/304

I just had my 258 rebuilt a year ago and couldn't be happier. The I6 has enough power and won't break things as easy (provided you're easy on the gas pedal). There was a thread a couple of weeks ago that had many 258 owners harping on how impressed they were with this engine. Having it rebuilt will let you stay within your budget, and essentially have a new engine. Keep in mind that this is the engine your jeep was "supposed" to have. Seems like keeping it always helps other things from going wrong ( ala complete engine conversion).

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