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Knox Trailers · Drivetrain
UNT RS4043903941
In stock · ships from Knoxville
This is a remanufactured Dana Spicer RS404 complete rear differential assembly for Class 8 heavy-duty trucks.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
We don't publish fitment for this part yet. Rather than guess, get it confirmed against your truck in under a minute.
It is designed for the rear‑rear position in tandem drive axles, with a 3.90:1 ratio and a hypoid ring gear. The unit is rebuilt to OEM specifications with proper gear contact, backlash, and bearing preload, making it a direct replacement for worn or failed differentials in line‑haul, dump, and heavy‑haul applications.
Part Number: UNT RS4043903941
Differential, Rear REMAN DANA DIFF ASSY
Dealer: Knox Trailers
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