Hi, I have a 2001 diesel super duty extended cab long box with a 6 speed. I have a 400hp rated valair clutch, ported compressor housing, ts 6 position chip with 120hp race tune at the top, deleted ebpv, 4 inch downpipe and 5 inch stacks. I have 265-75-16 bfg all terrain tires on the truck. My main question is what would be a good gear to pull in with these mods? I was thinking 1st high or 2nd low? Wondering what you guys think? Will I have to worry about wheel hop or axle wrap? I have rear air bags and would pump them up, deflate rear tires to about 50 pounds, assuming track conditions would be ideal. I have pulled a few times before but not with this truck. Any help would be great. Thanks!

 

nothing to offer. Good luck..Makes me sad to think about it.

 

I don't think you have to worry about axle-wrap on a non-lifted truck with stock sticks... but a 120 race tune will smoke and make things hot. The stock injectors aren't capable of much more than about a 60-80 HP bump... with that tall number being available only at very high RPMs. Your best tune would be the one with the greatest torque (not HP), but this is so very hard on your truck. I've bent a driveline empty (albeit with big sticks).

 

I didn't figure axle wrap would be a problem since I have stock size tires and pretty good drive line angles. I have pulled similar trucks before with no issues. I just want to see if anyone has pulled with a 6 speed with similar mods and what the best gear would be for a mix of tire speed and some power to keep her going? Assuming the track would be right.

 

I agree......I love going and watching them but would never think about doing it with my own truck...

 

I used to pull my 85 6.9 4x4. it had 35's and 410 front and rear.

ALWAYS use 2nd low side. You don't develop enough torque in high side.

also, if the sled is WAY OVER LOADED (as it was one night for me) you can always grab 1st and go down the track....

That night they loaded it to I think 115,000 lbs. in a class of 11 trucks only 4 of us got it out of the hole. 5 trucks broke in front of me.

 

Another thing, the airbags may not hold up the load.

I built suspension limiters. When I used to do it, they allowed them and had to have 1" travel. I built stoppers that hooked to the bump stop mounts with muffler clamps. The stoppers contacted the bump stops and when they loaded the sled, the bump stops would give me the 1" of travel.

 

I would think a better tire than a/t for a sled pull would be needed if its in the dirt. I know with tractors that they have the special ladder tread for sled pulls. Love to watch the tractors especially the antiques.

 

Wow they put that much on for a street diesel class? Who the hell was operating the sled? And yes I have always pulled in 2nd low just wanted to clarify.