by MMiller » Wed Jun 06, 2007 8:12 pm
*IF* you know you are aiming for 400 hp, *AND* want to hook it hard, *AND* run with newer trucks, then you should spend the money on a good clutch now, instead of spending money twice. I will warn you that your dana 70 will be begging for mercy, as will your getrag. I'd bet on the dana 70 giving up before the getrag, especially if you can pull 3rd gear.
If you are just pulling for fun, then the single disk will do just fine. Just plan on using 2nd gear and low side, and baby it out of the whole. Just know now, that you will not run down the track with any new duramaxes, or cummins trucks. I've tried 3rd gear, and seen a bunch of guys try 3rd with a stock or near stock single disk(like the one you mentioned) and just drive right through the clutch.
Hooking to a sled is very addictive. You might consided just getting a truck to pull, and one to drive to work. Thats what I did.
As far as twin disc clutches, I've never seen a SB DD clutch offered for the smaller input shaft. They automatically want you to have a big shaft(read NV4500). Enterprise engine used to have small shaft dual disk clutches. Maybe call Peter at SBC and see if they will make you a twin disc for the getrag.
Its been a few years, but I did hook once at Amboy, and had hopping troubles. Haven't been back as I moved away from the Quad Cities deeper into Iowa.
Michael
1993 W250, 3.55, NV5600 , Con O, bosch 185's, 4" exhaust, Super 40, pump tweaks, ground pin, Smokehouse air intake, Hamilton Cam,
1985 D350, Crew Cab, 92 cummins and a 518. 47rh to be built and installed along with 3.55 LS Dana 80