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Thread: New gears, or new engine?

  1. #1
    Rub some dirt in it!
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    Default New gears, or new engine?

    alright so i cant decide what to do. as we all know the 2.5L 4cyl engine is not the fastest thing out there... I put a new motor in it recently. anywho, I'm not looking to go racing in this car but something to get me over the hills on the highway without having to move into the slow lane :P i heard new gears should do the trick.. or i can swap it out for a 4.0, but that would be kinda like a last resort.

    im going to iraq for almost 10 months so i have some time to gather information and do some shopping. Im always open for advice!

    thanks!

  2. #2
    The Cow Shall Rise Again theyeti1775's Avatar
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    Regear would be first option.
    What lift and tires are you running now?
    Yeti

    Jeep Cherokee - Stock for now
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  3. #3
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    just stock.i would like to put a lift and mud tires on it as well

  4. #4
    The Cow Shall Rise Again theyeti1775's Avatar
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    The stock 4.10 gears should be fine with it than.
    Once you upgrade to 31's / 33's you will need the regear to have the same 'top end'.
    Yeti

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  5. #5
    Land Squid Jeffb_79's Avatar
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    I'd think you'd be good with 4.88 gears and 33" tires. Maybe slightly better than where you're at now.
    Although, you're going to be deployed for a while... you've got plenty of time to source out a new 4.0 and computer. Heck, you could always just source out a stroked 4.0

  6. #6
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    its so stickin slow though... this thing needs a boost :P

  7. #7
    G.I. Grandpa SGM O's Avatar
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    Living in Chetenne you have a similiar problem to anyone running at higher altitudes, your engine is not going to make the same power as it does at sea level no matter what you do. Regearing provides you some mechanical advantage and would be far less expensive than a new engine. If you think you are going to want to run 33" rubber and plan to stay near the Rocky Mountains I would go to 4.88:1 gearing. If you think you are headed to Florida or other flat lands at sea level 4.56:1 with 33" tires would be fine.

  8. #8
    Runs with Scissors Cjack350's Avatar
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    1980 CJ7 350sbc, T-18, Dana 20

  9. #9
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    someone would have to do that type of swap for me... i consider myself intelligent and could probably figure it out but as far as i know... im also smart enough not to try this on my jeep for the first time..

    and would altitude really have that much affect on the engine? i mean it needs some power... seriously. cant stress that enough :P when i get back im gonna go for the gears first i think... i dont want that much of a lift maybe 2 inches.

  10. #10
    Gold Star Dad JonJeffS's Avatar
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    Yeah... Unless the 2.5 was tired and you were going to get rid of it I would just re-gear it. I went with 4:10's since I have 33's, but I really wish I had gone 4:56 or even 4:88's now. My father-in-law is an instructor at the local community college auto program, so they did it for me pretty cheap...
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