I could give you all the figures, but as they say "teach a man to fish", use this calculator:Gear Ratio Calculator
The drop down menu's will have tranny's, transfer cases listed. Once everything calculates it even shows you what each gear ratio is and will give you crawl ratio's, rpm/speed and the ability to compare two setup's side by side.
I do love that calculator. There are a lot of them that are simplier, but none that are near as versatile and complete that I have found. I've used it a number of times designing a driveline.
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66 Bronco Half Cab, 203ci I6, CI aluminum head and intake, Isky 256/256 cam, Keith Black pistons, Clifford header, Holley 390cfm 4v, 9.7:1 comp, DSII ignition
hi i think i am trying to do the exzact same swap . a np435 with a dana 21 bolted to it would like to go to the bronk dana 20 so far it looks like i will b buying an adapter . if u figur some thing out b for next weekend please post or let my know . i would really apreciate it .
Hi When I put my NP 435 in it had the NP 205 on it I did have to make my rear drive shaft 1 inch shorter an my front shaft 1 inch longer an I also have to make a new cross member I will put some pic on my you would like to see how I did it . Rick
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