3.55's with 35's
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You didn't mention transmissions. I know people with Manuals that get along fine, but want bigger gears.
With 35s, the minimum gear with an AT is 3.92 and that's pushing it. No torque, and definitely harder on the transmission than it should be.
If you have 3.55s and try to run 35s with an Automatic, then if you don't pay for gears, you're likely to end up paying for a transmission rebuild, and another a few years later....
Running that large of a tire, with that small of gears puts a HUGE amount of stress on the tranny. It will get hot, and when it gets hot, it will die.
If you're worried about reliability, stick with the 3" lift and 33s... At least until you can get bigger gears under it.
Now if you have the manual, then go ahead. You won't be able to tow, but you'll do ok in every gear up to 4th. 5th will be for dead-flat roads and downhills....
With 35s, the minimum gear with an AT is 3.92 and that's pushing it. No torque, and definitely harder on the transmission than it should be.
If you have 3.55s and try to run 35s with an Automatic, then if you don't pay for gears, you're likely to end up paying for a transmission rebuild, and another a few years later....
Running that large of a tire, with that small of gears puts a HUGE amount of stress on the tranny. It will get hot, and when it gets hot, it will die.
If you're worried about reliability, stick with the 3" lift and 33s... At least until you can get bigger gears under it.
Now if you have the manual, then go ahead. You won't be able to tow, but you'll do ok in every gear up to 4th. 5th will be for dead-flat roads and downhills....
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i have a friend running 35X14.50 inch groundhawgs and he gets 16 mpg on the highway. thats with an exhaust, intake, and throttle body spacer. he had the trans built up and a shift kit installed just before the lift and tires and with about 40k on it since then he hasnt had any problems. thats with an auto too.
hey i am getting a 3 inch lift and am going to run 33x12.50's i have the 360 and auto tranny. will i be alright with the stock gears? i would think i would be ok since i mean it came with 265's (31.7) so what does another 2 inches hurt? i am going to be running bfg at's anyway
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807 Posts
sorry, forgot to mention that he is still running the factory 3.55's.
roughrider,
With the manual, you'll be fine, just will lose some power, may find yourself downshifting sooner on hills.
Canyonero,
I think you're friend is smoking something, or I need to start running Hawgs... 16?!?! He has a deisel, right?
: I haven't seen that kind of hwy mileage ever. But then, if he only goes 55-60mph... I'm always up around 72-75mph on the highway...
With the manual, you'll be fine, just will lose some power, may find yourself downshifting sooner on hills.
Canyonero,
I think you're friend is smoking something, or I need to start running Hawgs... 16?!?! He has a deisel, right?
: I haven't seen that kind of hwy mileage ever. But then, if he only goes 55-60mph... I'm always up around 72-75mph on the highway...
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969 Posts
When I ran 36's with 3.55's my gas mileage went down to 9mpg and the power was definitely not there. Thats with an auto tranny.
33s shouldn't be too hard on it, especially if you have the 3.92 gears (towing package includes those, I think). Even with 3.55, it's not horrible. Just bee good at changing your fluid, and remember that you're on the "HD service" and not the light-duty service schedule.
Also, for anyone that's worried about it, if you put in a tranny temp gauge, especially one with an alarm, you can find out if you'll be ok or not. If it's getting too hot, you'll be able to catch it and slow-down or down-shift.
May also want to make sure your bands get adjsuted every so often. Most quick-lube places won't. Don't know if the dealer will or not. Didn't feel like finding out for $100 they wanted for a tranmission service...
Also, for anyone that's worried about it, if you put in a tranny temp gauge, especially one with an alarm, you can find out if you'll be ok or not. If it's getting too hot, you'll be able to catch it and slow-down or down-shift.
May also want to make sure your bands get adjsuted every so often. Most quick-lube places won't. Don't know if the dealer will or not. Didn't feel like finding out for $100 they wanted for a tranmission service...
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3,036 Posts
On 2002-02-22 13:03, woody wrote:
roughrider,
With the manual, you'll be fine, just will lose some power, may find yourself downshifting sooner on hills.
Canyonero,
I think you're friend is smoking something, or I need to start running Hawgs... 16?!?! He has a deisel, right?
yeah i 16 mpg really hard to believe. with the tall tires and the high gears i was only getting like 6 mpg with 36"s swampers. hell i never even got 16 mpg the whole time i owned the truck.
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besides the window sticker, doesnt it say it inside the glove box?(i dont remember and im to lazy to go out and look!) or is it just what axles are underneath?
Sportram,
That math doesn't add up. 2500 rpm in which gear? by my math:
3.55s, 33s, and 75mph:
OD - 1900rpm
3rd - 2700rpm
3.92s, 33s, and 75mph:
OD - 2100rom
3rd - 3000rpm
I got this by:
5280/(33xpi/12)=revs per mile
rpmile*75 = revs per hour
rhp/60 = rpm of tire
rpmt * 3.55 = driveline rpm
3rd gear is 1:1, so driveline-rpm = engine rpm
OD is 0.69:1, so driveline-rpm is faster than engine rpm.
That math doesn't add up. 2500 rpm in which gear? by my math:
3.55s, 33s, and 75mph:
OD - 1900rpm
3rd - 2700rpm
3.92s, 33s, and 75mph:
OD - 2100rom
3rd - 3000rpm
I got this by:
5280/(33xpi/12)=revs per mile
rpmile*75 = revs per hour
rhp/60 = rpm of tire
rpmt * 3.55 = driveline rpm
3rd gear is 1:1, so driveline-rpm = engine rpm
OD is 0.69:1, so driveline-rpm is faster than engine rpm.
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807 Posts
with 4:10's and 33's its not uncommon for my truck to get 17-18 mpg on the highway going 55-60. however when the outside temp drops, so does the mpg.
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