View Full Version : cummings with 37s slow ?

09-28-2006, 09:00 PM
i m getting a brand new 06 dodge 3500 6 speed and its getting lifted 6" just dont knwo wether to go with 35's or 37's price doesnt matter i m just thinking power wise. i plan on exaust and intake chip but that might not be for a bit i m wondering if 37's will rob alot of power ?

Explorer guy418
09-28-2006, 09:05 PM
big enough engine u might notice a bit, warrantys gone after chip u know that right.......

09-28-2006, 09:07 PM
power wise it wont matter but your gearing will. are you getting the 3.7 or 4.1?

09-28-2006, 09:07 PM
I have driven a brand new ford and chevy diesel and they have tons of of power. I dont think you will have any worries specially with the mods ur doing.

My buddy has a newer duramax with 35's and it will roast the tires off with a rolling start.

Thats going to be a sick truck......dually or single?

Explorer guy418
09-28-2006, 09:08 PM
yeah duramax in work today said i think 700hp? i duno, propane injection chip, was sweeet big enough tires

09-28-2006, 09:17 PM
my buddy has an '05 cummins lifted 6'' on 37'' x-terrains with the auto, stock engine that thing pulled hard with the lift, with his MBRP exhaust, banks 6-gun programmer, turbo mods, this that and the other thing, will spin em easily . Not sure on what gearing( im assuming the tow pkg. will have a diff gear ratio) but that thing goes good. Only downside is getting anything into the bed, its at about chest height. Hard to get heavy stuff in.

09-28-2006, 09:37 PM
I have a 94 Dodge with a Cummins and i bought it with 33's on it and the only thing that I notice is between 3rd and 4th is a bi of a stretch it your not at high RPM I was thinking of liftinf mine and running a 40" tire but I think I would have to re gear for the higher gears the lower ones are not a problem at all.

09-28-2006, 09:42 PM
i plan on the chip and stuff but it might not be for a while i m just wondering in the meanwhile will it be a dog.

09-30-2006, 02:48 PM
ive come across dozens of dodges liftes with tires up here in ft st john and no ones said anything too bad about power loss.most of them have chipped it and what not but im sure youll find that itll be fine.good luck

09-30-2006, 05:28 PM
lift it and throw on the tires right away and you won't notice any power loss

09-30-2006, 09:38 PM
go for the 37's
im gonna run a set on my next ride.

10-09-2006, 10:01 PM

10-10-2006, 06:43 AM
they cummins wont be slow. It wont have the same 0-60, but it will still pull really hard off the line. The manual helps a fair bit cause the 1st on a g56 is 6.29 whereas the slushbox is probley somewheres in the high 2's to mid 3's.(assuming). I would wonder a lot about the clutch too, if you're gonna bomb the engine, slap on 37's and go towing, im fairly sure they clutch will demise pretty fast. I have heard nothing but excellent stuff about South Bend CLutches ( [url]http://www.southbendclutch.com/dodge_catalog.html/url] ). If you real worried, call PDR up. I'm sure they will say it'll be slower cause they have 600+ HP rockets, but they will sure point you in the right direction, and am sure have worked on lifted cummins'.

Heres the gears on the g56:
6.29:1 first gear ratio, 3.48:1 second gear ratio, 2.1:1 third gear ratio, 1.38:1 fourth gear ratio, 1:1 fifth gear ratio, 0.79:1 sixth gear ratio and 5.74:1 reverse gear ratio

10-13-2006, 08:38 PM
You wont have to change gearing except to fine tune if at all, once you put all your power mods on.

10-16-2006, 12:02 AM
do you have a pyro and boost yet? probably more important than your clutch life at the moment.

10-16-2006, 06:39 AM
^^^^^ fuel pressure too! Awesome truck, you will not be disapointed.

12-18-2006, 06:50 PM
big enough engine u might notice a bit, warrantys gone after chip u know that right.......

Not true, just take the chip out before you take it in for servicing. Got a buddy that's blown two engines, ford's rebuilt them both times, and he has a chip, methanol, 7 inch lift, 37's....list goes on.

12-18-2006, 08:14 PM
nice truck it would serve a person well, im jealouse

12-18-2006, 10:39 PM
got a friend with an 04 2500 9 inch lift and 37's with the 6 speed and his 4.1 gears he has no power problems, no performance upgrades except exaust. go with the 37's.

02-21-2007, 04:06 PM
my boss has 06 one tonne on 39.5 irocs no gears still goes ok but cooked a tranny alresdy