High or Low?

6495 Views 47 Replies 20 Participants Last post by crittersf1, Aug 9, 2010

playsinmud

Discussion Starter · Jul 26, 2010

I'm sure this has been talked about at length before.... But..
What do you guys run "normally"....

Last Thursday I ran my truck in it's first bogg..

Engine is .060 w/ flat tops voo doo cam 1ooo to 55oo, dove heads, weiland 8012, 770 carb, MSD.

Mud was deeper than I exptected it was also a clay like mud.. Deep, dry, and real sticky. I changed out the 38.5's and put my 32's on. Ran 4 high first pass and it just didnt spool up high enough. I've got a c6 w/ 4.10 gears.

I expected that motor to spin the 32's like crazy? No such luck....

I figured the bogg would get faster as we dug deeper to solid ground. So I ran high range for pass 2 and 3. I never got 5,000rpm in first...

I know nothing about C6 transmissions. do they Shift by themselfs even if you hold it in low?

So newbe to you salty dogs.. What do I do next time? 4-Low and 38.5's? Is my motor missing something? Should it have more power? BTW.. new to this Ford stuff.. you all have converted a Chevy guy with your ground thumping torque of a 460!!!!

1 - 20 of 48 Posts

jerad188

· #2 · Jul 26, 2010

glad to hear you've hopped the fence and joined us ford folk!
i would have thought 1st gear would be plenty enough to spin 38's in 4 high, then again i dont no what type of 1st gear a c6 has, i dont know if i could ever bog my granny geared 4 speed down in 1st.
but especially with 32's and 4.10's!!!!!

wvmudder

· #3 · Jul 26, 2010 (Edited)

This is one of those things you'll have to experiment with. I know I was surprised at just how heavy thick clay mud can be, it doesn't like to come out of the tire voids. You could also be losing a lot in the tranny if its not healthy. I have seen a lot of well built engines look like turds because of worn out trannies.

Also, I wouldn't even think about the 38s until you can spin the 32s at will, even in high range.

Dave S.

BTW, what transfer case are you using?

crittersf1

· #4 · Jul 26, 2010

I run lo-range and nothing else.

McQ

· #5 · Jul 26, 2010 (Edited)

I run lo-range and nothing else.

X2

crittersf1

· #6 · Jul 26, 2010

Hi-range is a transmission's worst enemy.

playsinmud

Discussion Starter · #7 · Jul 26, 2010

I'm running what ever transfer case comes in a 87 F250? I have no idea the gears in the xfer case or the C6? you guys know?

THANK YOU ALL SOOOO MUCH!!!

hdandford

· #8 · Jul 26, 2010

X's 3 on the low range

sandy metcalf

· #9 · Jul 27, 2010

low 2.46 second 1.46 in transmisson, would need to know which transfer case.

crittersf1

· #10 · Jul 27, 2010

If it's a 208, 2.61 If it's a 1356, 2.71

78bronco460

· #11 · Jul 27, 2010

I used high range with 38's, shifted the C6 manually, and won a lot of races. I haven't raced it since I swapped to the 5 speed and doubler.

575ciBronco

· #12 · Jul 27, 2010

I run high range with 557/C6 3:55s and 38s. Always run SXS though no bogs for me! I have a built C6 and a huge cooler with a 17" electric fan as well.

Derrick

EWmudracing

· #13 · Jul 27, 2010

ive never run mine in hi range bog or drag and with it being an f250 im betting it as the 2.71 borg warner

77mud

· #14 · Jul 27, 2010

Low range most defintally

kjett

· #15 · Jul 28, 2010

The biggest thing depends on gear ratio.

Critters, I hate to say, but you are wrong on saying high range is a transmissions worst enemy. If you think about it cars don't have transfer cases which is basically like running your truck in high range. There are plenty of big tired slick wearing cars running the drag strip with c6's and having no problems. The key is making sure your motor/tranny/gear combo is all matched for what you are doing. I know of quite a few trucks running high range but have 5.14 and lower gearsets to make up the difference. Me, I am only running a 4.10 gearset so I'll keep my t-case is low range for now until I get time to regear it. I just smoked my tranny in low range, so what's really harder, the high range or low range?

EWmudracing

· #16 · Jul 28, 2010

ive always been told high range eats up tranny's just think about it what is the gear reduction in high range compared to low range

kjett

· #17 · Jul 28, 2010

EWmudracing said:
ive always been told high range eats up tranny's just think about it what is the gear reduction in high range compared to low range

Being told something and doing the research are 2 different things. Like I said before, I guess all them drag car guys are smoking transmissions like nobody's business. If you really think about it, 4 low makes your motor rev higher to get the desired wheel speed. While the motor is spinning higher, the converter is spining faster, causing the pump to spin faster creating more heat making parts wear faster. I'll say it again, it all depends on gearing. Higher gears need the low range to create the same wheel speed as lower gears and high range.

phatjack81

· #18 · Jul 28, 2010

kjett said:
Being told something and doing the research are 2 different things. Like I said before, I guess all them drag car guys are smoking transmissions like nobody's business. If you really think about it, 4 low makes your motor rev higher to get the desired wheel speed. While the motor is spinning higher, the converter is spining faster, causing the pump to spin faster creating more heat making parts wear faster. I'll say it again, it all depends on gearing. Higher gears need the low range to create the same wheel speed as lower gears and high range.

There's a big difference between a drag car and a mud truck. All a drag car has to over come is a little bit of rolling resistance, the weight of the car and air. A mud truck has all that and 3ft of mud. It mostly depends on your horsepower. Low horsepower low gears high horsepower higher gears. Also depends on if you drive on the street. If you set up right to run in high range in the mud it would spin the motor to fast on the road, who would want to cruise down the road @ 60 mph and spinning the motor 4000 rpm. I'd set it up with the right gears for low range in the mud then you still have high range for the drags.

kjett

· #19 · Jul 28, 2010

By reading the OP's original post, it sounds like a dedicated mud truck and not a street truck playing in the bogs. While I agree that 3' of red clay and mud is difficult to move in, the drag car with a set of 33" slicks has tons of stress on that driveline. creating a similar rolling resistance as mud. Gearing there, just like gearing in our sport is key. Too low gearing won't help when the guys you are running against are using high range and coming up with 159mph wheel speeds. Different schools of thought is all I'm saying

jerad188

· #20 · Jul 28, 2010

wouldnt high range better for the t case? isnt high range a straighter shot through the t case then havin to use the low range?? kinda hard to explain what im tryin to say, but in a gear driven t case i mean.??? i coudl be wrong

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