4.56 gears
Champion
Joined: Jul 2011
Posts: 4,895
Likes: 35
From: Gilbert, Arizona
What size do you recomend?
I would go 3.92 if you're going to a 30" tire, you also should check the weight of the tire that as well as the diameter will kill your mpg.
The 55 to the 92 isn't a great big jump unless your racing and off your peak hp rpm by a few hundred.. Otherwise the difference in mpg vs getting up and go isn't going to be very noticeable, figure at 2000 you'll be at 55 with the 4.10 and 68 at 2500, the 3.92 will be 57 at 2000 and 73 at 2500.
If mpg is your concern be careful with the bigger tire, weight as well as diameter can be hurtful to mileage.
The 55 to the 92 isn't a great big jump unless your racing and off your peak hp rpm by a few hundred.. Otherwise the difference in mpg vs getting up and go isn't going to be very noticeable, figure at 2000 you'll be at 55 with the 4.10 and 68 at 2500, the 3.92 will be 57 at 2000 and 73 at 2500.
If mpg is your concern be careful with the bigger tire, weight as well as diameter can be hurtful to mileage.
Thank you for all and any replies.
Width would be the 235 part of the tire number, if you're only concern is mpg and not handling in corners and the like then you want narrow tires.
If you want to hang in the corners hard and fast you may want to increase that 235 to 265 or 275.
235 and less for more mpg, and watch the weight of the tire... stay away from bridgestone they all tend to run heavy
If you want to hang in the corners hard and fast you may want to increase that 235 to 265 or 275.
235 and less for more mpg, and watch the weight of the tire... stay away from bridgestone they all tend to run heavy
Administrator
Joined: Jul 2007
Posts: 24,686
Likes: 21
From: South Georgia/East Florida
There are MANY factors you have to consider to determine what the right gears are for your application.
The first thing you have to consider is what you are really looking for is the proper "effective gear ratio" which is the gear ratio in relation to tire diameter. A truck running a 3.55 ring/pinion combo with 28" tires will have a significantly different effective ratio than the same truck running 33" meats. Power may feel tremendous with them 28s but could very well suck ***** and the truck won't be able to get out of it's own way with those 33s.
The transmission also plays a HUGE part in what are the "right" gears. One truck with a four speed tranny and 4.56 gears with say 33" tires may tach 2500 RPM at 65 MPH in effect killing highway fuel economy (but hole shot will snap your head back!). The same truck/engine/tire combo with say the 545rfe transmission that in essence has two separate overdrive gears may only be taching 1900 RPM at that same 65 MPH and may actually gain a smidge better gas mileage on the interstate (while realizing significant gains in city driving conditions).
What may be a perfect combo for one guy who posts on here may be all wrong for you. Do your homework, ask guys who have close to the same setup as you do. Also there are a number of "online calculators" that can help you to determine your best gearing based on tire size, transmission ratios, engine, etc...
The first thing you have to consider is what you are really looking for is the proper "effective gear ratio" which is the gear ratio in relation to tire diameter. A truck running a 3.55 ring/pinion combo with 28" tires will have a significantly different effective ratio than the same truck running 33" meats. Power may feel tremendous with them 28s but could very well suck ***** and the truck won't be able to get out of it's own way with those 33s.
The transmission also plays a HUGE part in what are the "right" gears. One truck with a four speed tranny and 4.56 gears with say 33" tires may tach 2500 RPM at 65 MPH in effect killing highway fuel economy (but hole shot will snap your head back!). The same truck/engine/tire combo with say the 545rfe transmission that in essence has two separate overdrive gears may only be taching 1900 RPM at that same 65 MPH and may actually gain a smidge better gas mileage on the interstate (while realizing significant gains in city driving conditions).
What may be a perfect combo for one guy who posts on here may be all wrong for you. Do your homework, ask guys who have close to the same setup as you do. Also there are a number of "online calculators" that can help you to determine your best gearing based on tire size, transmission ratios, engine, etc...