well just wondering what year an what exactley makes it a h.o mines an 01 6sp 4x4 so is this concederd one and what is the diff hp rateing on reg 5.9 an 5.9 h.o trucks thanks

 

The HO Cummins have the High Output VP44

I think all standard transmission 24V have it and the HX35 12CM instead for the Automatic Trans Trucks have the HY35 9 CM

 

thanks well do ya have eny idea on fact hp rattings on the h.o an non h.o cummins

 

2001 ISB engine changes (begins Jan 1, 2000)

235hp / 460 ft. lb. ETC engine installed in 5-speed and automatic equipped trucks
ETC continues to use a 10cm2 HY35
245hp / 505 ft. lb. ETH engine became available with the DEE 6-speed.
ETH returns to the 12cm2 HX35W turbocharger.
ETH receives a higher output fuel injection pump.
Compression ratio is increased from 16.3 to 17.0.

 

235 so 245 ho. the 6 spd was supposed to be the ho and the auto and 5 spd were so trucks.

 

thanks fellas for the input the vp pump on the h.o still prone on dyeing i suppose

 

The 5spd ETC used the HX35 as well. The HY35 were used on the autos.

 

yep, its the design of the VP, plus an HO pump will make less potential hp when bombed then an SO pump because the plungers inside are actually smaller and wont flow as much fuel

 

well that sucks on the plungers what is the diffrence right now why the h.o is puttin out more power than the so pump?

 

Look here for the differences:

2001 ISB engine specs