Stepdown axle nut sizes

bob ward

I'm working on a 54 Dana Spicer back axle at the moment. I've noticed that it has a 3/4" thread on the LH axle and a 5/8" thread on the RH axle. Is the 5/8" threaded axle one from an earlier stepdown or has someone made it a smaller thread because the original thread was burgered?

[Deleted User]

Bingo! The axles( both Hudson made and Dana Spicer) were for 3/4 " Watch your thread size. They are a bastard size of 20 tpi. Tough to find.

Park_W

And the "severe usage" axles have a finer thread than the standard ones.

bob ward

Thanks guys, good tip on the threads. Are the Dana and Hudson axle shafts interchangeable? I have a spare Hudson rear end to hand but no Dana.

ESSX28-1

Bingo! The axles( both Hudson made and Dana Spicer) were for 3/4 " Watch your thread size. They are a bastard size of 20 tpi. Tough to find.
I found 3/4" 20 tpi castellated nuts at Rock Auto. Was listed as spindle nut for 56 Olds!!
(Dorman 615065)

[Deleted User]

Bob, The axles for Hudson built and Dana/ Spicer will NOT interchange. The Hudson is a tapered axle and has a few coarse splines while the Dana axle is straight and has fine splines Axle nuts , brake hardware and drums will interchange but not backing plates.

[Deleted User]

If I'm not mistaken, I think MoPar used that same nut to hold their steering wheels on around the 1950 period.

bob ward

Thanks for all that good advice Hudzilla. I'll hunt down another Dana axle shaft.