I Might Just Know What I'm Talking About
Join Date: Jul 2001
Location: Sisters, Oregon
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Re: Dana 20 low range conversion
You'll need a D20 case and a large front bearing adapter. You will need to grind the D20 case a little to clear the larger gears out of the 18. You'll also need a bronco rear upper sliding gear, 18-8-58 for the rear drive. Make sure the intermediate shaft from your 18 matches in diameter with the 20. You could always bolt on the 20 case as long as you got the right input gear, but the 20 low is only 2.03 compared to the 18's 2.46. Be careful not to mix gears, there are two different gear pitches between the cases. Check out the info base at Novak adapters, it'll get you all the info on the 18 and 20 that you'll need.