looking to get more wheel speed?

73chevytruck · January 23, 2014, 12:36:18 AM

Looking to get more wheel speed in my k20 it has 4:10 gears in it now and 38's and about a 400hp sbc and a 350turbo trans and 203 case. Thinking about swapping gears. But what would be the best gear ratio?

betterbeaters · January 23, 2014, 01:08:50 AM

try high range if you want more wheel speed or bigger tires mabye? i run 38s and 4.10s and a 208 if I had 400hp id try a high range lol

Orangecrush · January 23, 2014, 01:19:19 AM

Quote from: betterbeaters on January 23, 2014, 01:08:50 AM
try high range if you want more wheel speed or bigger tires mabye? i run 38s and 4.10s and a 208 if I had 400hp id try a high range lol

x2

4x4xdodgeman · January 23, 2014, 02:02:05 AM

what kind of 38s are you running?

fordrunner · January 23, 2014, 05:11:50 AM

wind it up and

it into 2nd thats what i do. low range peak of the cam hit the next gear that with a 400+/-hp sbf c6 205

73chevytruck · January 23, 2014, 12:40:18 PM

38 gumbo monster mudders.
And I do run high range.

BIG DOG · January 23, 2014, 01:14:10 PM

the cheapest is the t case gear ratio from a 203 go to a 208 you'll drop 50 lbs and get a better low gear and you need to see what the truck is doing will it hold 2nd gear in hi range or is it dropping it and heating up your trans from the load.

MR NASTY · January 23, 2014, 06:01:14 PM

400 hp and high range is barely enough to run 1 st gear with 38s.

RaZiN KaNe · January 23, 2014, 08:49:39 PM

Quote from: MR NASTY on January 23, 2014, 06:01:14 PM
400 hp and high range is barely enough to run 1 st gear with 38s.

its all about rotating mass boys n girls! get rid of the steel rims and go to a light aluminum rim billet aluminum hubs would also make a big diff. 400 hp is no where near enough power to run high lock! 600-700 hp is highlock range and it prob still wouldn't like drive with a 410 gear! everyone has there own ideas but my statements are tested not theories! highlock in the mud is very labor intensive on a transmission! I would say with 400 hp and 38s I would run a 538 gear at a minimum and keep it in low lock should run drive in light mud prob will not like it in the thick heavy slop!

4x4xdodgeman · January 23, 2014, 08:52:18 PM

mr nasty they

there heads!!! hi range that's funny!!! how fast is any truck or car going down the road in second gear, with stock tires?

MR NASTY · January 23, 2014, 09:24:46 PM

Yup that's for sure I run a light ass jeep 38 bloggers with a healthy 383 and 456 gears and it is a dog in high lock! Most people think a cam and intake get ya 400 hp but would be surprised if they actually dynoed there stuff and find out they are actually putting 250 to the wheels! Not saying this is the case here but I've seen it many other times. Definitely the less rotating mass the better

73chevytruck · January 23, 2014, 11:02:57 PM

I have a .60 over 350 with flat top pistons. .510 lift 280 duration cam. 2.02 intake and 1.60 edelbrock aluminum heads high rise dual plane intake.
I'm picking up a 208 soon and getting rid of the 203 and then Probley going to 5:13 gears.

betterbeaters · January 24, 2014, 12:00:32 AM

putting a 208 and 5.13s will slow the tires down.. you said you run hi range. it that 1st gear or 3rd? my 87 ran 1st in hi with a 4 spd stick worked its ass off and I had to dump the clutch at 5000 rpms to help it get going to 5500 rpm if I was lucky. swaped to a 350th with same tcase and gears had to run low and it was 1st and 2nd... my new motor is about 375-400hp and if I have time it will be dynoed like the last one lol but id guess ill use 3rd in low lock.

MR NASTY · January 24, 2014, 12:10:52 AM

Quote from: marshall on January 24, 2014, 12:05:11 AM
Gutting the truck out will get you wheel speed. Remove all the glass, heat, wipers, carpet, sound deadener, lights, cut the doors up, gut the box, remove the exhaust, remove the bumpers...makes a huge difference.

Then put nitrous on it

lmao

Mudbuster · January 24, 2014, 01:13:19 AM

I agree with what others said above you SHOULDN'T be in HI you should be in low.

My jeep is 4000# 500-550hp 4:56's one tons, 4linked with 40" cut boggers and I run low range. By the way from the description you gave of your motor I don't believe it's 400hp but that's just my

just one more · January 24, 2014, 01:25:04 AM

38" boggers 456s 3500 stall,true 400-475hp and I run 2nd gear low range

gojohnnygo · January 24, 2014, 01:38:40 AM

Quote from: marshall on January 24, 2014, 12:05:11 AM
Gutting the truck out will get you wheel speed. Remove all the glass, heat, wipers, carpet, sound deadener, lights, cut the doors up, gut the box, remove the exhaust, remove the bumpers...makes a huge difference.

Hell just sit on the frame and hold the bottle!!

Then put nitrous on it

wildbroncoII · January 24, 2014, 03:26:14 PM

I would spend some time playing around with a gear calculator.

73chevytruck · January 24, 2014, 04:16:53 PM

I also have a 3500 stall torque converter to.

Rohde009 · January 24, 2014, 11:02:14 PM

I have close to same thing in a 76 long box a bit more motor talked to a guy in Indiana about making my 208 into a just high gear case and making it weight 45 pounds I have 39.5 boggers and 4.10 gears he said not to even do it unless I would have a high 5 to a mid 6 gear low range all the way