Differential models

P stands for pump. Apparently not necessary, as i switched mine from DSP402 to DS402

 

The P in DSP stands for planetary double reduction.

I believe its DSH and the H is for High performance or high horsepower applications.

Google "Dana Service manual" and it calls out all the meanings for the model numbers.

 

I'm not sure that a DSP40 is "double planetary", but I do know that I was talking about a completely different rear-end than the op was asking about. DS402p is an Eaton, and the p stands for pump in that one.

To quote Rosanna Rosanna Danna, "nevermind!"

 

DSH has a 3/4” larger diameter ring gear. It’s an oddball.

 

I would not consider a dsp40 a “super 40” however, back in the day, a ds405 was considered a super 40 because they had heavier axle housings....even though they had the same basic differential as a ds380, ds402, ds404 and dsp40. Are you confused now?
The only reason to spec a dsh40 is to satisfy hp/torque requirements for the truck manufacturer if you insist on 600/2050 in a standard road truck application.

 

Huh! It looks like everything has changed after 35+ years of doing everything the same! Lol
http://global.dana.com/~/media/dana...hicle/cv-literature/specguideupdatev01r03.pdf

 

DS405 is an Eaton. DSP40 and DSH40 are Dana.

 

I’ve installed ds404 in dsp40 housings as a direct swap