Engine/Transmission (1998.5 - 2002) What Size Clutch should I be looking at HP-torque level?

[jmos4]

Hi,



I've got a 99 with 150,000 on it has 175hp injectors and a Hot Rod VP pump and a Glacier Diesel mechanical lift pump and running a 4" exhaust with a Smarty running at #5 and unsure on how much HP and Torque I am producing, when I bought the truck the guy said 450hp and 700ft/lbs, but not sure how he arrived with it and that was before the Smarty or the mechanical lift pump.



The truck currently has a Centerforce Dual Friction clutch with about 30,000 miles on it and its slipping at anything over 3/8 throttle so looking like I need a clutch and wonder is anyone running a similar combo and what clutch would you suggest?



I use the truck as a daily driver which occasionally tows a car trailer, I also like going thru the gears so would like to get a clutch that can deal with my driving style and usage, also my wife needs to be able to drive it in traffic as well, so I don’t want a much stiffer pedal than I have currently, was looking at South Bend but unsure on sizing it and is a dual disk better for daily driving or is a single?



Regards,

 

[Joseph Donnelly]

The best approach would be to tell South Bend the above and get their own recommendation. It is difficult to make a clutch as smooth as stock to hold double the HP and torque, and also be "cheap. " They can discuss compromises with you. The con-O-HD would be smooth and stout but might not hold max torque, depensing on what that really is with your mods. SBC can definitely give you a clutch to hold the power.

 

[gtwitch]

Ditto!!! on the southbend, I put a NAPA kit (made in China), in my 99 and have been sorry ever since as it chatters on engagement, but no slip issues. Wish I had spent more and got the Southbend!!



gtwitch in wyoming

 

[Sticks]

South bend, definitely.

Your torque should be closer to 900 if the HP is accurate. It's a Cummins thing. Double the HP = torque (close estimate, usually higher)

 

[jgillott]

South bend, definitely.

Your torque should be closer to 900 if the HP is accurate. It's a Cummins thing. Double the HP = torque (close estimate, usually higher)

My former '01 did exactly 450. 4 hp and 967. 8 lb/ft tq on Dunbar's dyno back in the day. I agree that the torque on the OP's truck will likely be in that range.

With that said, I ran a South Bend Con FE single disk on that truck and it performed very well in most cases. The only issue I had with it was how touchy it was trying to back up a trailer. And, even though it was great on the street, I could walk right through it on the race track if I launched it a little too hard.