3.73's

[gotlift?]

quick question. are 3.73's good for 35x12.5's? i've been told yes and no. the truck drives fine, on and off road. no bogging down or anything. by the way, its a 05 std cab, sht bed, 4.3 V-6. any help would be cool.

[Mark_in_Tulsa]

quick question.  are 3.73's good for 35x12.5's?  i've been told yes and no.  the truck drives fine, on and off road.  no bogging down or anything.  by the way, its a 05 std cab, sht bed, 4.3 V-6.  any help would be cool.

 

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Ahh no way. And how are you going to fit them under there?

[snoman]

quick question.  are 3.73's good for 35x12.5's?  i've been told yes and no.  the truck drives fine, on and off road.  no bogging down or anything.  by the way, its a 05 std cab, sht bed, 4.3 V-6.  any help would be cool.

 

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Ahh no way. And how are you going to fit them under there?

 

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I agree, try about a 4.88 because not only are tires bigger in daimeter but they have more drage too. With 4.88's or 5.13's and a 4.3 it will run pretty good and MPG will be as good as it can get too because of extra drag from lift and tires. If it was a V8 I would say try a 4.56.

[gotlift?]

yeah i was wondering what to kinda gears to get because i have 3.73's now. it came with em from chevy. how much mpg are we talking cause it gets 17/19 now? and does anybody now where to get em and roun'about how much?

[snoman]

yeah i was wondering what to kinda gears to get because i have 3.73's now.  it came with em from chevy.  how much mpg are we talking cause it gets 17/19 now?  and does anybody now where to get em and roun'about how much?

 

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Figure on a 3 to 5 MPG loss with that size and lift and likely even more if it is not geared right. Tires can play a big roll in MPG. When I run some nasty 950 x 16.5 10 ply studded snow tires on my K3500 in winter months I take about a 2 MPG hit over stock smooth tires and they are only 31's too.

[03HD]

quick question.  are 3.73's good for 35x12.5's?  i've been told yes and no.  the truck drives fine, on and off road.  no bogging down or anything.  by the way, its a 05 std cab, sht bed, 4.3 V-6.  any help would be cool.

 

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To calculate the appropriate gear ratio to return the driveline to where it was coming out of the factory use this equation:

 

(new tire height/old tire height) x old axle ratio = new axle ratio

 

if your stock tires are say 265/75R16 this equals about 31.6 inches

new tires equal 35 inches

stock axle ration equals 3.73

 

New axle ratio would equal 4.14

 

With that said you would want to go with the closest available which would be 4.10 gears. If you wanted some added grunt to offset additional weight and drag, etc. with the understanding you will trade off with higher highway rpms (less mpg) you could go with 4.56 gears.

 

The gears should run you anywhere from $500 to $700 and probably about the same to get them installed.

[snoman]

quick question.  are 3.73's good for 35x12.5's?  i've been told yes and no.  the truck drives fine, on and off road.  no bogging down or anything.  by the way, its a 05 std cab, sht bed, 4.3 V-6.  any help would be cool.

 

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To calculate the appropriate gear ratio to return the driveline to where it was coming out of the factory use this equation:

 

(new tire height/old tire height) x old axle ratio = new axle ratio

 

if your stock tires are say 265/75R16 this equals about 31.6 inches

new tires equal 35 inches

stock axle ration equals 3.73

 

New axle ratio would equal 4.14

 

With that said you would want to go with the closest available which would be 4.10 gears. If you wanted some added grunt to offset additional weight and drag, etc. with the understanding you will trade off with higher highway rpms (less mpg) you could go with 4.56 gears.

 

The gears should run you anywhere from $500 to $700 and probably about the same to get them installed.

 

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For a easier way to calculate this, click on link below.

Click Here