gears
#11
01-30-2012, 08:57 PM
Diesel Bomber
if it were me i would for sure go to 4.10's if not 4.56's you need to do the math and see what your final drive ratio is with your 38in tires compared to stock tires and adjust acordingly to where you want your best performance. so many people think they get better fuel milage with bigger tires, THIS IS WRONG because they dont factor in the ratio change to the ground and there instrement cluster making things read all stupid. diesels can get away with a higher final drive most of the time but for the best performance do your math.
Nothing like crusing down the interstate at 70mph turning 2700RPM with 4.56 gears... DOH.
#12
01-30-2012, 09:07 PM
it wont be though with 40's he has to just do the math then figure out where his engine creates the most usable torque and gear to that. every truck is different. theres a right way and a not so right way with everything, all im saying is it would probably be in your best interest powerstrokefan92 to do a little figuring on the drive ratios on your truck and see what will work best. guessing sucks and cost way more than most of us car to spend over and over again.
Last edited by turbo2332; 01-30-2012 at 09:13 PM.
#13
01-31-2012, 07:47 AM
#14
01-31-2012, 08:34 AM
Diesel Bomber
#15
01-31-2012, 09:56 AM
i can almost see your gas gauge moving...
...
like csi said the best thing to do is to mod the truck and make up for the tires with the engine. if i remember right our best operating range is 1700-2k (like 62% sure on that) and hes right above that
...like csi said the best thing to do is to mod the truck and make up for the tires with the engine. if i remember right our best operating range is 1700-2k (like 62% sure on that) and hes right above that
#16
05-14-2013, 08:21 PM
Diesel Fan
Join Date: May 2013
Location: San Diego
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#17
05-15-2013, 12:23 PM
Diesel Fan
Don't waste your time. 5k ain't enough to shake a stick at behind these trucks. If it was 15k every day of the week then it would be justifiable.
#18
05-15-2013, 07:07 PM
Diesel Fan
if it were me i would for sure go to 4.10's if not 4.56's you need to do the math and see what your final drive ratio is with your 38in tires compared to stock tires and adjust acordingly to where you want your best performance. so many people think they get better fuel milage with bigger tires, THIS IS WRONG because they dont factor in the ratio change to the ground and there instrement cluster making things read all stupid. diesels can get away with a higher final drive most of the time but for the best performance do your math.
Think this way... Factory runs 265 metric tire. This equals close to 28" tires. The numbers are not exact, but good for the sample. With 265 mm tall tire. 3.73 gears will turn the engine around 2500 at 70 mph. This is the average thought process for NORMAL use.
If you want a taller tire for off road. GO lower gear. The lower gear and taller tire will keep the powerframe within NORMAL tolerances. Off road this gains you low end torque/power from the line. This also gains you the power/torque to pull bigger tires.
to pull trailers up a long hill with all power/torque. use a higher gear and factor tire.
figure what you want to then go from there.
#19
05-27-2013, 12:17 AM
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#20
05-28-2013, 08:54 PM
Diesel Fan
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