Dana 20 2.46:1 old school gear swap

[CrustyJeep]

Hijack: Aborted
Spun off from http://www.nw-wheelers.com/forum/showthread.php?t=4999

Yup... And steal the gears out of 18 and do the old school 2.46:1 thing, and you won't lose any low range.

Don't think this is correct. You need a Bronco case with the 2.46 gears from a Dana 20. (That's how I did my model 20 in my 79 CJ). Bronco 20 cases are the same as CJ cases, only with the reverse drop and lower gears.

You do need one gear from a Bronco case, a '73 (IIRC) or early J shft case. You just need the rear low range sliding gear, all the others come from the Dana18. Actually I think you can do it the other way around too (using just the bull gear from the Dana18), but I didn't investigate that route.

Edit - Yes you can put the 18 gears into a 20 case, but there are some issues due to the idler shaft is larger (wish I remembered better)....

The two low range gears (the big spur gears) are too big. You have to do a little clearancing with your trusty grinder, I think mostly around the rear drive gear.

 

[jeeptech 1]

Your both are correct I have built this combo many times. Be sure to grind the 20 case for clearance at last 0.100 from the case bottom. or it WILL break the case under HARD USE.