Best overall gear ratio

[jmh78]

I have searched and have not had much luck. I have a 3.8 atlas and 44" TSL's and I am not racing across the desert but I would like to scare myself on the occasional gravel road. I will be running a 6.0 Liter with a cam upgrade. So what does every one find to be the compriable R&P ratio for southern wheeling / excitement with a decent V-8?

 

[gomer pyle]

4.10 or 3.73???
i am going to try 3.0 and 4.10

 

[Cole]

I have a 6.0 th400, 3.8 atlas and 4.88 gears in 3rd gear low range my top speed is 36mph.

 

[B Gillespie]

350 Vortech, TH350, 3.8, 4.10 works great in low, but a dog in high. Nice top speed in low range for crawling, but not a good race setup. Eventually plan to swap in 6.0L, 3.0 atlas, & 5.13's when I'm not tuition poor.

Turnkey shortstar, 904, 3.0, 6.50 great in low, scary fast in high.

 

[blacksheep10]

with 44's, better go 5.13.
This is with me having 4.10's, 4.56's, racing in rigs with 4.88's, 5.13's and 6.17's. My honest opinion is the lower the better within reason. Get high side where it's actually usable. It will feel like a fast drag car with low gears. It will feel like a dog ass turd with anything in the mid to low 4.xx's and down. Running in low all the time is gay

 

[COPPERHEAD42]

with 44's, better go 5.13.
This is with me having 4.10's, 4.56's, racing in rigs with 4.88's, 5.13's and 6.17's. My honest opinion is the lower the better within reason. Get high side where it's actually usable. It will feel like a fast drag car with low gears. It will feel like a dog ass turd with anything in the mid to low 4.xx's and down. Running in low all the time is gay

Not when you can run 80 in low

 

[blacksheep10]

theoretically on the rev limiter, yes. Lots of rigs do that on the calculator. Nobody drives around at 4500 rpm cruising and bursts up to 7 from time to time with their fully built OD trans.
What do I know, cole can go all of 36 mph with a 3.8 case. IMO 3.8 is too low if you can afford some axle gears.

 

[bigsilly]

LS1, TH400, 3.0 Atlas, 5.38's

 

[whiskeymakin]

on the potential wheelspeed calc. do you add or multiply your axle ratio and t-case ratio? the calculators i have found just give a trans, diff, rpm, and tire size. no box to add the t-case ratio

 

[doctordick]

engine RPM divided by trans gear ratio divided by t-case ratio divided by axle ratio.
Example: 5000 rpm / 2.34 = 2137 2137 / 2 = 1068 1068 / 4.1 = 260 rpm. to convert to MPH, multiply tire diameter times pi roughly 3.14 equals inches travelled per revolution, so 42 x 3.14 = 131.88 x 260 rpm = 34288.88 inches per minute x 60 minutes per hour = 2,057,332.8 inches per hour divided by 12 inches per foot = 171444.4 feet per hour divided by 5280 feet per mile = 32.47 miles per hour WHEW Where trans gear ratio is 2.34 to one, t-case ratio is 2 to one and axle ratio is 4.10 to one. Now if there's an engineer out there, if you calculate final torque to the rear axle, in a locked axle, is the torque divided between the two wheels or is the full amount applied to each wheel? 200 lb/ft engine torque x 2.34 trans ratio = 468 lb/ft x 2.0 t-case ratio = 936 lb/ft x4.10 axle ratio = 3837.6 lb/ft. My question is this, is 3837 lb/ft applied to both wheels or is 1918.5 applied to each wheel?

 

[matlock]

engine RPM divided by trans gear ratio divided by t-case ratio divided by axle ratio.
Example: 5000 rpm / 2.34 = 2137 2137 / 2 = 1068 1068 / 4.1 = 260 rpm. to convert to MPH, multiply tire diameter times pi roughly 3.14 equals inches travelled per revolution, so 42 x 3.14 = 131.88 x 260 rpm = 34288.88 inches per minute x 60 minutes per hour = 2,057,332.8 inches per hour divided by 12 inches per foot = 171444.4 feet per hour divided by 5280 feet per mile = 32.47 miles per hour WHEW Where trans gear ratio is 2.34 to one, t-case ratio is 2 to one and axle ratio is 4.10 to one. Now if there's an engineer out there, if you calculate final torque to the rear axle, in a locked axle, is the torque divided between the two wheels or is the full amount applied to each wheel? 200 lb/ft engine torque x 2.34 trans ratio = 468 lb/ft x 2.0 t-case ratio = 936 lb/ft x4.10 axle ratio = 3837.6 lb/ft. My question is this, is 3837 lb/ft applied to both wheels or is 1918.5 applied to each wheel?

and then what's up if the tire is on dig? what's the factor of hook dirt

 

[payne97]

starting a all over and I'm going 2 run a 6.0 (cam L92 heads LS3 intake) with a 400 with a 2.75 first gear 205 with 1.96 and 4.88 what do ull think
i think ill need a 5.13 or a 5.38 gear

 

[doctordick]

and then what's up if the tire is on dig? what's the factor of hook dirt 9

It's just liike the one eyed duck that didn't dare walk in the rain. Always remember Grasshopper, an orange is like a vest because it has no sleeves. laughing1

 

[KyTrash]

I have a couple sets of gears laying around. So,when I get mine together if I'm not happy. I will change them again. But,I'm going to start with 4.56 and my atlas is 3.8. The guys at www.planet4x4.net have a great gear calculator. I ran my junk on it and starting thinking that my 5.13s was to low. Just have to wait and see. With my weak ass motor,I will probability need the 5.13s.

 

[B Gillespie]

Roy's calculator is titties: http://www.grimmjeeper.com/gears.html

 

[4byfan]

I have a 3.8 atlas with 3.73 gears 44 tsl/boggers. Turbo 400, never run 1st gear always run 2nd when climbin ocasionally 3rd. Put a motor n it and let her eat,also run a 3800 converter.

 

[lay]

So what about a ls1 with a cam and good tune th350 atlas 3.0 and 4:10s and 40" treps

 

[blacksheep10]

So what about a ls1 with a cam and good tune th350 atlas 3.0 and 4:10s and 40" treps

You will be fine in low with 40's as long as you have power. Not the best crawling gears at 30:1 first, but perfect for lighting the tires and climbing. I love anything between 30:1 and 40:1 for spinning 40's hard if you have power.

 

[doctordick]

Never mind

 

[blacksheep10]

Never mind

I should mention after my post that 30:1 sucks balls bad when in the rocks and your tranny will get hot if you go to clayton and play. If you live in the creeks and like to climb like me, or like to shoot hills and get it the F on, mid 30's:1 kicks ass.
Now, crawling is another ballgame. 40:1 in low 1st to have fun. JabNasty's is 2.5x3.0x6.17= 46.275 in 1st low and it is low as **** in teh rocks with 40's.