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  • Step-by-Step 4R70W Automatic Transmission Installation

    ****ATTENTION potential 4R70W installer**** If you intend to reference this thread in accomplishing your installation, I STRONGLY urge you to carefully read through the ENTIRE writeup. Modifications were made along the way so everything is not necessarily is perfect operational order.

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    This article will guide you, step by step, through the installation of a 4R70W automatic transmission into a Early Bronco with a C4 automatic, D20 J-shift transfer case, and 302 engine.

    I used info in the following threads to gain general information regarding different aspects of the swap.

    http://www.classicbroncos.com/forums...light=4R70W+ZF

    http://classicbroncos.com/forums/sho...d.php?t=184809

    http://classicbroncos.com/forums/sho...=182915&page=3

    http://classicbroncos.com/forums/sho...&postcount=194

    http://classicbroncos.com/forums/sho...84&postcount=1

    The C4 has served me well but with the 35" tires, 4.56 gears and my personal requirement to make this rig drive to events, I was forced to install something with overdrive. With the C4, my RPM sat around 3,000 @ 60MPH which was unacceptable to me. I have no desire to travel faster than 60 because this huge rolling brick becomes a massive drag device and MPG go even further down the toilet. I prefer to see my RPM cruise around 2300 RPM and with the 0.7 gear ratio of the 4R70W, I was able to achieve that goal.

    Below is my list of parts which I have added as of the conclusion of the project which totaled $1,980.00

    4R70W-junkyard-'99 AWD V8 Mountaineer -$320 + $30 core
    starter-junkyard-'99 AWD V8 Mountaineer-$ Included w/ transmission
    converter-junkyard-'99 AWD V8 Mountaineer-$ Included w/ transmission
    flexplate-junkyard-'99 AWD V8 Mountaineer-$ Included w/ transmission
    ZF crossmember-BC Broncos-ZF-$125.99
    ZF adapter-BC Broncos-50-4303-$441
    controller-Baumann-OS1-$565
    harness-Baumann-HPF2 or HPF2A-$ Included w/ controller
    shift cable-Lokar-ACA-1808-$52
    Lokar Dipstick -$$105.90
    JB Fab Twin Sticks-$149.03
    Aux cooler lines-$23.99
    Adapter seal 471950-$18.36
    Misc fitting, bolts, and other crap-$59.61
    14 quarts of trans fluid and trans filter:$90.00

    Got the 4R70W from a 1999 Mountaineer AWD (also referred to a 4WD or 4x4) 5.0 with 100K miles from a local salvage yard.







    Click here to continue to the rest of the installation...
    This article was originally published in forum thread: Step-by-Step 4R70W Automatic Transmission Installation started by chuzie View original post