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Discussion Starter #1
i have 4.33 gears with 37" tires and it seems to runs the rpms a little high for freeway driving approx. 2500 @70mph . what gears do some of you have with 37" tires how do you like them and how does your truck pull with them .

i have the original set of 3.73 gears that came with the truck in a box when i bought it .

thanks for input :thanks:
chris
 

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I have 4.10 gears with 215-85-16's (stock size) and my rpm is verry similar to yours, within 100 rpm.

Its hard on fuel economy just driving empty, but with a trailer hooked on I wouldn't change a thing. I am normally towing with my truck and 70 mph is typically all the faster I can go. Without getting tickets anyway LOL

If you are dead set on changing gears I would probably go with 4.10

3.73 might lug a little bit for driving 55 to 60 mph with 37's
 

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I have 4:10 gears with 35" tires, which brought my speedo back to within 1mph of being accurate(according to my gps). At 65 mph, I'm turning 2200 rpm's. As far as pulling, the 4:10 gears are way better. Stock gears in my 96 F-350 were 3:55. Hope this helps.

Rodney
 

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I LOVE MY 37's AND 3.73's... Wouldnt change a thing... Nothing like cruising at 70mph and 1800rpm's. If I set the cruise at 70, I am going about 80 and at 2200rpms... works great for me but I have about 20 speeding tickets...LOL :sofa:
 

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coreystroke02
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I also have 37's with the stock 3.73 gears and I like them alot. As mentioned before, cruising down the interstate at only 1800 rpm is great. The truck is still very strong on the bottom end also. I'm getting 17 mpg on the interstate with my set-up, but only 13 mpg in town. Hey CSIPSD, how are yuo clearing 37's with only 4" of lift? I have 6" of lift and my 37's rub very bad.
 

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The Oracle
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im running stock 3.55s with 38s......i think they're great!!! 70mph at right around 1550rpm.....

fine around town(i dont go around racing so i dont need it to launch)

still get round 17-19 mpg too
 

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coreystroke02 said:
I also have 37's with the stock 3.73 gears and I like them alot. As mentioned before, cruising down the interstate at only 1800 rpm is great. The truck is still very strong on the bottom end also. I'm getting 17 mpg on the interstate with my set-up, but only 13 mpg in town. Hey CSIPSD, how are yuo clearing 37's with only 4" of lift? I have 6" of lift and my 37's rub very bad.
Wheel Offset... Its all about wheel offset!!:Thumbup: LOL
 

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The Oracle
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CSIPSD said:
Wheel Offset... Its all about wheel offset!!:Thumbup: LOL
agreed!! and superduty vs obs.....lot less lift needed on the new trucks

im running a 16x10 with 4.5 offset and have no rubbing with 6inches
 

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Discussion Starter #10
thank you all for input sounds like i would be best with 3.73 back in truck for freeway cruising and since i don't pull with it much i don't need the extra bottom end grunt .
chris
 

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I agree, I love my 3.73's. At 55 I am just under 1200 rpms....just barley idileing down the highway. I hardly tow so it makes sense to me. I think I am just under 1800 on the highway at 70. Still get 16-17 consitently....got 17.5 recently!!! Most guys don't believe me though....
Good luck,
Steven
 
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