well I raced an '01 6 spd dually yesterday, I won on top end, but take off sucks, my truck sits there and spins the tires all the way through 5th gear, any suggestions for more traction? all help is appreciated, thanks

 

are you spinning both wheels or just one? a good LSD or locker may help a ton. other than that what tires are you running?

 

Wider, stickier, tires. Detroit locker, 4 link suspension, ninty/ten up lock front shocks. More wieght at the rear. MO MONEY

 

That about covers it!

Beleve it or not,More wieght,.....in the right place(rear of axle or ferther back!) will make it FASTER!
box the bed near or after the rear axle,throw 500. pound's of sand bags...or what ever, and you'll see the differance!!!!

 

it is not posi-trac, so just one tire spins mostly, I am running cooper wild country tires

 

what size tires?

 

One should be careful, to much grip on a non LSD will cause wheel hop, trust me you dont want that. best thing you can do is install LSD or a locker, and a traction device such as ladder bars or 4 link or 4 bar suspension. A bit of weight may help a bit but it doesnt correct the problem, as you add power you'll have add more wieght.

 

Allso i thing that our cummins or set to far forward!

I haven't actualy measured to tell but i thing that thats why our 1st gen's are so bad in winter season in 2wd, then compaired to our younger bothers(2nt&3d gen's)

But a well desined 4 wink would multiple 10 fold, the tracton over moving the eng back!

lowering tire pressure would help a little but(like lowering the air pressure on a 80 psi tire down to 35-40.......this is what i do so i don't have to have my hubs lock in all winter!
it dus help.

With a posi traction, of some sorte, will give you more the 50% more traction!!!!!...........
think about it, the tire that starts to slip,is the one with the least traction!!!!!!!
when i first when form a open diff to a posi unit in my car, i was disapointed .....I couldn't spin my tires any more and had to put some more power into the motor

Traction bars work well, but tend to bend the leaf springs in the long run.

 

My 89 has the limited slip from the factory, It seems to work well, I know that if i didnt have it i would be spinning the rear all the time, as it is now, i can break them loose alittle too easially! Try and fing a factory D70, I would think that most had lsd already, Mabey you could add dually tires to help!
Peter.

 

They all have D70's.

Mine has a limited slip rear. I have no traction problems on dry pavement, but I won't get on it hard until 3rd gear. It will spin the duals in any gear in the rain.

 

There's just not enough weight on the rear axle for good traction in these trucks under any circumstances. I'd be careful about the 90/10 drag shocks, too. It'd ride like a pogo stick with 60# valve springs. As for the bars 'n stuff, I have still not figured out why the (er, um, "us") truck guys don't do the Caltrac thing like the car (uh, er, "them") guys do, instead of these big honkin' 10-foot long fifty pounds of dead weigh things they (uh, er "we") call traction bars:

http://66.17.171.114/PhotoAlbum/Cars/Pics/duster_24.jpg
http://66.17.171.114/PhotoAlbum/Cars/Pics/duster_23.jpg

 

I thing why (and i'm just flapping my juw) thay don't use the short bar idea is becuse our truck are so heavy and will not be light enought to work...........we need more leverage so the frames don't try to fold up with some of the supper high HP/TORQ trucks out there.

I shore wish that i would have went with the cal track bar instead of the supper stock spring on my car

 

I dunno. A leaf spring is a leaf spring is a... Those Caltracs on my Duster in the pics above use 3/16 plate for the brackets welded to C-bod shock plates with inch and a half black pipe and 3/4 inch threaded rod for the tubes. They are 10 times stronger than the ones you can buy for $300 and only cost me $50 + my time to make them. You could use even heavier stock for the truck. If stopping axle wrap is the only goal, I think this would be the way to go. Only reason I haven't done up a truck version is I'm afraid someone will come out and explain why it don't do what the trucks need and I'll look stupid (again!)

 

I was told by caltracs that the stiff front seg of the supper stock spring wouldn't work and well as a stock or HD stock spring would(when i bought my supper stock spring there was no such word a caltracs.)

the further up you put a bar the more leverage you will have in lifting that heavy diesel eng when the rear axle try to rotate up.

 

I suppose if you were putting enough power to the ground. Maybe that torque level would put too much stress on the spring hagars and potentially bend or break the frame mounts with that much leverage against a big heavy Cummins that far out in front of the center of gravity? Hard to imagine, but..

Anyone have any stories about big power trucks tearing the rear undercarraige out from underneath themselves at sled pulls? Seems like the driveline would have to break way before that could possibly ever happen.