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Getting ready to start my cj7 build

Discussion in 'Jeep CJ Builds' started by Eddie85cj7, Jun 22, 2020.

  1. Jun 22, 2020 at 7:31 PM
    #1
    Eddie85cj7

    Eddie85cj7 [OP] New Member

    Joined:
    Jun 22, 2020
    Member:
    #4791
    Messages:
    4
    Gender:
    Male
    First Name:
    Eddie
    Vehicle:
    1985 CJ7
    Hey guys new to the Jeep game I’m moving on from drag racing. I just purchased a 1985 CJ7 that is mostly stock except for a shackle lift and 35’s.

    This is the list of things I’m thinking of doing chime in if something is not possible.

    I’m wanting to put 40” tires with an appropriate lift ? It’s just going to be a beach cruiser bar hopper on concrete I’m thinking of upgrading the stock axels and changing the gearing for the tire size. Drum to disc for the rear. Motor and trans later I’m digging the 258 right now. So what’s the best lift for these and which is better under or over the axel, and how much lift for 40” tires.
    Sorry for all the questions in advance.
    Thanks Eddie.

    I originally posted this on the cj page I believe it belongs here.
     
  2. Jun 22, 2020 at 8:41 PM
    #2
    aggrex

    aggrex Well-Known Member

    Joined:
    Sep 12, 2016
    Member:
    #203
    Messages:
    3,797
    DE
    Vehicle:
    Backcountry '16
    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    IMO moving up to 40s is going to be your biggest expense as no stock jeep axle will last long rolling them big ones. That 258 is a good low end torquer who will become anemic running them 40s. Enjoy the ride and share a pic or 2 before the transformation.
     
  3. Jun 23, 2020 at 9:13 AM
    #3
    Jim Beam

    Jim Beam Well-Known Member

    Joined:
    Feb 11, 2019
    Member:
    #2891
    Messages:
    487
    Gender:
    Male
    First Name:
    Donald
    Vehicle:
    1986 CJ7
    Fuel Injection, Dana 44s, T18, 4.10s w/lockers
    I have seen too many attempts at installing a huge tire on a CJ as the stock axle just cannot take to load. The brake system and clutch cannot take it either. I would suggest no larger than a 33" tire With aluminum wheels. AMC recommends no larger than a 31" tire. When you install a lift on a CJ you have to consider the effect on the rest of the complete driveline also.
     
    aggrex likes this.
  4. Jun 23, 2020 at 9:34 AM
    #4
    Eddie85cj7

    Eddie85cj7 [OP] New Member

    Joined:
    Jun 22, 2020
    Member:
    #4791
    Messages:
    4
    Gender:
    Male
    First Name:
    Eddie
    Vehicle:
    1985 CJ7
    I plan on upgrading the stock axels and gearing to accommodate the larger tires. Example a stock ford 9” is good for maybe 400 hp. After upgrading the axels and third member it’s good for 1500+ hp. It’s never going to see mud or trail riding and probably never go over 55 mph.
     
    LYFZGOOD likes this.

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