Now that Swink's got me thinking about the Dana 20, how do you run the speedometer? I'm sure it's a cable setup. Would a 231 unit drop in (1.75" hole)? What's the difference between the T and J shifters? Which is better? Also, will the D20 need an adapter ring? What years are the best? Do all the Fords have the same gearing? Anything else I've missed on?
Trying to decide of I should just go with a SS 231 or a D20. Right now, the cost of the D20 makes it appealing. but after it's all said and done which one would really cost less?
The Bronco D20 is a cable driven speedo. I use a adapter kit from Dakota Digital. The cost for both pieces is around $110 IIRC. The electronic box allows you to adjust your speedo by turn up or down some switches. The 231 unit will not drop in. The hole for the D20 is alot smaller.
The biggest difference between the T and the J is the gearing. (I always get them mixed up) The earlier units IIRC 71 or OLDER have the lower gearing 2.46. From what I have been told they are easier to twin stick. There units are the ones you want. The 72 and later ones have 2.34 gears and the shift pattern is not the same. All the internal stuff can be swapped back and forth from what I understand. I just put in a output shaft assy. from a 72 and my D20 is a 71.
I a not sure if a adapter for the D20 to the AX5 is avail. I have not checked into it.
As far as price it would depend on what you spend on a D20,rebuild kit,wether or not you want twin sticks, 32 spline ouput or the 300M output, speedo adapters.
The SS SYE would be a cheaper thing to do. You would need D-shaft work either way.
The biggest reason for me to do the D20 is the length. I wanted a short gear driven case to put behind the Klune. 18.5 inches from where the tranny bolts up to the middle of the rear yoke. I have had the setup for 2 years now and LOVE IT!!!