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Originally Posted by turbo2332
(Post 851101)
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.
:argh: Nothing like crusing down the interstate at 70mph turning 2700RPM with 4.56 gears... DOH. |
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.
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Originally Posted by CSIPSD
(Post 850642)
I prefer the 3.73's to the 4.30's I have now. Add hp, not gears.
im spinning 37s on 3.73s and with an intake exhaust tuning turbo and water meth i run about around 1800-1900 at 70 |
Originally Posted by riddick01
(Post 851551)
see above...
im spinning 37s on 3.73s and with an intake exhaust tuning turbo and water meth i run about around 1800-1900 at 70 Such a nice quiet ride that way... Now with 4.30's and 37's.... http://inlinethumb16.webshots.com/45...600x600Q85.jpg |
Originally Posted by CSIPSD
(Post 851573)
Such a nice quiet ride that way...
Now with 4.30's and 37's.... http://inlinethumb16.webshots.com/45...600x600Q85.jpg 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 |
I tow a 5,000 pound trailer to the desert and i was wondering since i have a six inch lift plus 35inch tires if i should go to 3:90s or 4:10s? I have an sct 3015 so I could tune it to towing mode but I want to know if the gear swap is really worth it.
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Originally Posted by HJOHNSON61697
(Post 1007615)
I tow a 5,000 pound trailer to the desert and i was wondering since i have a six inch lift plus 35inch tires if i should go to 3:90s or 4:10s? I have an sct 3015 so I could tune it to towing mode but I want to know if the gear swap is really worth it.
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Originally Posted by turbo2332
(Post 851101)
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. |
great info mark thanks:c:
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Thanks.Glad to offer some help.
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