72 Bronco..... going from NP435 /205 to C4 / D20

[Aso544]

Ok... Finally to the point I'm gonna get everything needed to get my manual swapped to an auto. I'm gonna list all I think I need but if you see something I missing, however small, please advise. I want to get everything in hand before the project starts.

4wd C4
D20 w/adapter
Drive shafts x2(properly sized)
Torque converter (suggested size for 302, 3.50 gears, 33" tires?)
Tranny cooler
Auto Steering Column ( stock or FR)
Auto Brake Pedal


I did some research and it appears a C4 won't work with my 205... Or so I was told so that's why I'm going with the D20. Also... I contemplated going with an AOD but was concerned with my gears/tire size that it might not be all that effective on the interstate.

Any help and guidance will be greatly appreciated on this project.

 

[Viperwolf1]

No need for auto brake pedal. It just has a wider pad, everything else is the same.

You will want a stock converter with those gears and tires. It will be a little doggy on takeoff but good on the highway. Consider 4.10 gearing.

4x4 C4 is not specific enough. Bronco IIs used a 4x4 C5 that is often confused with a C4. Big difference is the spline count on the output shaft. You need a Bronco C4, 28 spline short output.

D20 needs C4 adapter, bearing retainer, and auto spud shaft.

Need an auto trans block plate and flexplate. There are several sizes. A pan-fill C4 (Bronco) uses a big bellhousing (164 tooth flexplate) and the big blockplate. Flexplate bolts are shorter than flywheel bolts.

Need a vacuum line for the modulator.

Need a kickdown rod or cable. The rod requires the carb linkage so it may be easier to use a cable.

 

[rwill]

Just did this. (3speed) Seriously doubt cooler will do the job. It would not here in Arkansas summer heat. Al;so need automatic starter.
Roger

 

[rwill]

Neutral safety switch