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Engine upgrade

Discussion in 'Wrangler YJ (1986-1995)' started by Acbmn, Apr 29, 2018.

  1. Apr 29, 2018 at 8:10 AM
    #1
    Acbmn

    Acbmn [OP] New Member

    Joined:
    Apr 29, 2018
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    Male
    First Name:
    Anthony
    Vehicle:
    1995 wrangler yj
    Factory drive train,mild lift 31 inch tires
    I want to swap 4 cylinder out and 1980's in line six into, 1st timer at this. I am looking for better performance while driving on the highway. Currently the four struggles in 5th gear st highway speeds.
     
  2. Apr 29, 2018 at 1:21 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Welcome to the site! You might want to consider an engine from a similar year. Looking at your profile, it says you have a 1995 jeep?
     
  3. Apr 30, 2018 at 7:42 AM
    #3
    OFFGRID

    OFFGRID Well-Known Member

    Joined:
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    First Name:
    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    There is more to it than just swapping engines. You will need to find a whole driveline: motor, tranny, and Tcase. The tranny mated to the 4 banger will not hold up to the 6 even in normal daily use and therefore nobody makes adapters for them to fit together. I believe the tranny to the 6cyl will not mate up to the 4 cyl Tcase either. I have seen whole drivelines for as low as $1000. Still need to find motor mounts, tranny mounts etc to make it fit.

    It sounds like you could really benefit from regearing instead. What size tires are you running and what gear ratio to you have now. If you have 33inch tires you should be running at least 4.56 gears and preferably 4.88 gears to maintain decent power at highway speeds in 5th gear. This will also give you more umph off the line (more low end torque)
     
    JKBob 25 and aggrex like this.
  4. Apr 30, 2018 at 9:31 AM
    #4
    aggrex

    aggrex Well-Known Member

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    DE
    Vehicle:
    Backcountry '16
    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Welcome! With some research and information from jeeps.net you may conclude that it's a big job which might explain why some YJs end up traded or modified or upgraded to V8 power as the work involved can be somewhat similar.
     
  5. Apr 30, 2018 at 6:25 PM
    #5
    JKBob 25

    JKBob 25 Well-Known Member

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    Bob
    Jersey Shore, NJ
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    2016 JK Wrangler Sport
    2" Superlift kit. 315/ 70/17.
    Welcome to the forum Acbmn. Another one of those threads I can't contribute to. But subbed. Learnin thread for me.
     
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