4-Low vs. 4-High
 

Ok, anybody got comments on what works best, I have heard about the same for both, is it better to pull a sled in 4-low or 4-high???

Ive always been told to pull in 4 low, the reason behind it is that they claim it puts too much stress on the drivetrain in 4 high, and 4 low will get ya more bottom end pull too.

it depends on what kind of truck you got.......if its a stock truck......low side/low gear......if you got a dedicated truck or a powerful truck you can run the high side or low side and depending on what gear in the tranny you use.......it will speed up or slow down your tires.......some guys run high side 2nd or low side 3rd depending on tracks.....i know some guys running low side 4th if they are on the right track and the truck can make the power.......

Great advice, I have a few upgrades to do yet before I even attempt it with my 03 GMC, like Tie rod sleeves, are there any better than Cognito, or would they be the best to go with?

not real sure ive heard of other guys runnin them but definately do that before ya pull ive seen way to many people with their tires facin the wrong way.

yeah I thought so, there was a video posted not loang ago showing a D-max pull a Dodge, by hookin chains and even though the Max did ok, he broke up front...
Thanks

take your torsion bar bolts completely out if you got small enough tires........on the tie rods....no matter what company you go with.....make sure you get extra adjuster nuts......cause you will break or bend the aftermarket tie rod at the exposed threads.......it happens everytime.......build you a set of traction bars and bumpstops too....

if you love your tranny stay on the low side unless the track is extremely muddy or loose sand type. i run 4th-low on 90% of tracks with good clay, when its loose soil or muddy and i know im just gonna blow the tires off, go with 2nd high range for a tad more wheel speed and you know the traction is not there to bust the drivetrain.

when you run in low range (dodge has a 2.72:1 reduction ratio in the tcase) so that puts 2.72 times less tq on the tranny. i dunno how the ZF-6 is strength wise but i know there are more dodges that have grenaded nv5600's and G56's running 2nd gear high range vs. 4th gear low range due to this simple principle of tq reduction.

Dead nuts on!!!

Oh and you are lucky to have a 2.72:1... Us 1st gen pullers have to fight a 1.9:1 TC. :argh:

actually its 1.96:1 to be exact........but whos counting.....:5:

Great, thanks guys! Good Info to have BEFORE I get started!:U:

Cognito is the only place to get pitman/idler arm braces. For the tierods you can get sleeve or HD tierods. There are several places that you can get either. Don't drop the tbars all the way you want to drop them so the CVs are flat. Do this with your truck weighted down if your running extra weight. Before you back out the adjustment bolts get the front of the truck off the ground lifting it by the frame to unload the tbars a little more. Several guys just clamp the springs works kind of like a poor mans traction bar. Get some 3" ubolts that are flat not rounded and a piece of flat stock with 2 hole drilled in it for the bolts. Or 2 pices of flat stock with holes and 2 bolts. The idea it to make a clamp and use it to compress the springs down to the overloads in front and behind of the axle, so you need 4 clamps total.

are you running the 6 speed
i am trying to find the right gear for pulling but my truck is kinda odd

i have 2003 cr with the nv4500
i try running 3rd low hit the rev limiter
then i moved to 2nd high hard on clutch

i am tring to ge the 4000 tune from bob but i have heard back from him yet

is there a formula that i can get to figure out what tire size i need to run 3rd low???

I am running 6spd Man w SB DD, I am just u8nsure of my overall gear ratios...:w2:

looks like you hiding something

any ways what size of tires do you run and rpm i sure your way above me in the rpm cause i cant get the 4000rpm tune yet but i am just trying to compare

thanks bidgaddy:rocking:

I can get to 3500, I am running 285/75-16 BFG at-KO's, I have not done very much to really tune this thing for pulling, I have just been told by many around here that with how it runs I should try it and there happens to be a big pull in Rural Retreat Va this weekend. I am also unsure of what RPM to run when taking off, etc. this will be my first time in front of the sled... I was thinking 4-low in 3rd gear and dumping the clutch @ 2800-3000rpm to get it going...

DONT "dump" the clutch you will break stuff fast that way, you want to let it out easy which means you'll be slipping it a little but just dont slip it to the 100 ft mark or something like that, but yeah 3rd gear 4 low should work good...if it feels like its boggin to much try to stop before the 100' mark or 75' depends on what the rules are and you will get to go one more time then try 2nd gear you may run out of gear but its your first pull so its experiment time to see what works best with your truck:pca1:

Dont forget the Video of your pull:c:

OH yeah, I am hauling mine and a buddies trucks on my trailer and we plan to take turns shooting the pulls, and thanks for the advice! I was kind of wondering about dumping the clutch too... for that very reason, I really do not think I will slip it that much, even though I have some upgrades power wise, I have a SB DD clutch and I do not really think I am pushing enough torques to slip it too bad, but we will see!!!:yeah::pca1:

Not once it engages it shouldnt slip, but when your first leaving the line and your letting the clutch out you'll slip it a little but once the clamps good skinny pedal down til the flag flies at the end :choochoo:

Or until I pull it home...:5::choochoo:

You will not slip your SBC DD at your power level unless its damaged (once its engaged that is)

with 33" tires and a 6spd use 4th gear, 4 low. you said you can hit about 3500rpms so that should be right about where you wanna be. point your drivers side mirrow down so you can see your rear tire, once you tighten the chain and get the green flag, take it up to 3500 or a lil higher if it will free rev that high and once you hit that magic number start to ease the clutch out. you will feel and hear it load the motor and when the truck squats and slowly starts to turn the tires watch your mirror, when you can see about a half rotation of the rear tires you should just about be off the clutch and the tires will break loose and you can go to town, keep the hammer down and dont let out unless it starts hopping.

do not drop your rear tire pressure, keep about 60psi in them they will have plenty of traction with the sled pulling them down into the dirt, drops the fronts to 25-30 depending on track conditions. not enough rear air pressure leads to the bunny hops and broken parts.

here is a video of what i am talking about with letting the tires turn about half a rotation before you are all the way off the clutch, just watch the dirt start slinging. ive done it this way on 27 hooks now and the clutch still holds....gotta love them SBC DD's

I am disappointed, I don't think I am going to be able to get it done in time, things fell through on using the shop, But I am also trying to fab some custom stuff, I just got started too late to go this Saturday...

I pull in 4-low and 4th or 5th