Dana 18 Tapered Roller Bearing Upgrade.

I changed to a d20 with terra low.... I can drive the freeway at 70 and hear the engine.....works wonders for the tc noise.........

 

Possible to use mismatched gear angles? There are many different gears for these units that might appear to fit together but not mesh properly. Novak has a table of gear numbers that are used with the various Dana transfer cases: The Novak Guide to Dana 18 & 20 Gears Interchange 1941-1979

 

I'm not aware of any different tooth angles on TC internal gears. Yes, there are a bunch of different gears over the years, and the D18 and D20 have their own sets. The only tooth angle differences I know of is in overdrive units depending on manufacurer. I think Husky OD units have a unique tooth angle from other brands.
-Donny

 

Dana 20 used two different angles. 17 something degrees and 20 something degrees. Two different gear sets to accommodate. One set used 18-5-10 intermediate gear and I believe the other intermediate was 18-5-16. The input gears do NOT interchange. I learned this the hard way 25 years ago on a Scout 2. You must have the gearsets that match each other.