stock to 35s
Thread Starter
Joined: Feb 2006
Posts: 29
Likes: 0
RE: stock to 35s
Thanks yall.
From what i've found, its 4.11 to bring it back to stock range (35s) and 4.56 to get some more off the line and around town, while sacrificing a few hindred rpms on the highway.
Looks like I'll see what I can get the 4.56s for.
Anyone done gears in our diffs b4- I'd like to do the work myself, but don't want to mess it up.
From what i've found, its 4.11 to bring it back to stock range (35s) and 4.56 to get some more off the line and around town, while sacrificing a few hindred rpms on the highway.
Looks like I'll see what I can get the 4.56s for.
Anyone done gears in our diffs b4- I'd like to do the work myself, but don't want to mess it up.
All Star
Joined: Feb 2006
Posts: 928
Likes: 0
From: Va.
RE: stock to 35s
I janked this off a previous post I threw 2 cents at. This is with an auto trans. I dont know what the final drive ratio is for a 5 speed. Stock was using 265/75/16 that came on the sport in 97.
As far as all the questions about what gear everyone should change to. That depends on your driving speeds and towing. Personally I want my RPM's closer to 2000 than the norm of 1500-1800. Too low and no umph. Too high and wear out the motor and eat gas. Just keep in mind that to low of an RPM and it takes a lot of energy to get the mass moving(like having a 4 cyl.) and OD is virtually worthless like mine. Do the calculation and decide what RPM range you want to run in. Our trans ratio is .690
Stock 70 X 3.55 X .69 X 336 /31.5 = 1828 60 X 3.55 X .69 X 336 / 31.5 = 1567 = In and out of OD
70 X 4.10 X .69 X 336 /35 =1901
70 X 4.56 X .69 X 336 /35 = 2114
How can I determine what ratio to use for my application?
A. mph x gear ratio x trans ratio x 336 ÷ Tire Diameter = RPM
Tire Diameter
Example:
70 mph x 3.73 (gear ratio) x .67 (trans ratio) x 336 ÷ 27(tire diameter) = 2176RPM
70 mph with a 3.73 ring and pinion over drive transmission in 4th gear with a 27" tire will perform at 2176 RPM
As far as all the questions about what gear everyone should change to. That depends on your driving speeds and towing. Personally I want my RPM's closer to 2000 than the norm of 1500-1800. Too low and no umph. Too high and wear out the motor and eat gas. Just keep in mind that to low of an RPM and it takes a lot of energy to get the mass moving(like having a 4 cyl.) and OD is virtually worthless like mine. Do the calculation and decide what RPM range you want to run in. Our trans ratio is .690
Stock 70 X 3.55 X .69 X 336 /31.5 = 1828 60 X 3.55 X .69 X 336 / 31.5 = 1567 = In and out of OD
70 X 4.10 X .69 X 336 /35 =1901
70 X 4.56 X .69 X 336 /35 = 2114
How can I determine what ratio to use for my application?
A. mph x gear ratio x trans ratio x 336 ÷ Tire Diameter = RPM
Tire Diameter
Example:
70 mph x 3.73 (gear ratio) x .67 (trans ratio) x 336 ÷ 27(tire diameter) = 2176RPM
70 mph with a 3.73 ring and pinion over drive transmission in 4th gear with a 27" tire will perform at 2176 RPM
