how to determine rearend gear ratio??
Thread Starter
I ♥ Acer
Joined: Jun 2006
Posts: 526
From:
how to determine rearend gear ratio??
tag says 373 but im told its unlikely, nobody is being very helpfull in the fourbanger section...anyway i get almost 2 full turns on the drive shaft for one complete turn of the wheel. i dont know how to calculate it this way, and im sure some one here does, thanks guys
5th Gear Member
Joined: May 2005
Posts: 3,850
From: Central New York
RE: how to determine rearend gear ratio??
look on your door sticker and if the axle letter is W then you have 3.73, if its M you have 2.73.... it's possible they are 3.73, easy way to check is pull your speedo gear ont he side of the tranny and count how many teeth it has if its more than 19 they are 3.73's most likely it will be a 21 or 23 tooth gear
Thread Starter
I ♥ Acer
Joined: Jun 2006
Posts: 526
From:
RE: how to determine rearend gear ratio??
where is the axle letter on the door tag? down on the bottom where it has trim and stuff it says "ax" and under that it says "6"
ORIGINAL: 7upedition
look on your door sticker and if the axle letter is W then you have 3.73, if its M you have 2.73.... it's possible they are 3.73, easy way to check is pull your speedo gear ont he side of the tranny and count how many teeth it has if its more than 19 they are 3.73's most likely it will be a 21 or 23 tooth gear
look on your door sticker and if the axle letter is W then you have 3.73, if its M you have 2.73.... it's possible they are 3.73, easy way to check is pull your speedo gear ont he side of the tranny and count how many teeth it has if its more than 19 they are 3.73's most likely it will be a 21 or 23 tooth gear
5th Gear Member
Joined: Jan 2006
Posts: 2,645
From: So-Cal
RE: how to determine rearend gear ratio??
ORIGINAL: 4bang93stang
where is the axle letter on the door tag? down on the bottom where it has trim and stuff it says "ax" and under that it says "6"
where is the axle letter on the door tag? down on the bottom where it has trim and stuff it says "ax" and under that it says "6"
ORIGINAL: 7upedition
look on your door sticker and if the axle letter is W then you have 3.73, if its M you have 2.73.... it's possible they are 3.73, easy way to check is pull your speedo gear ont he side of the tranny and count how many teeth it has if its more than 19 they are 3.73's most likely it will be a 21 or 23 tooth gear
look on your door sticker and if the axle letter is W then you have 3.73, if its M you have 2.73.... it's possible they are 3.73, easy way to check is pull your speedo gear ont he side of the tranny and count how many teeth it has if its more than 19 they are 3.73's most likely it will be a 21 or 23 tooth gear
Thread Starter
I ♥ Acer
Joined: Jun 2006
Posts: 526
From:
RE: how to determine rearend gear ratio??
so whats all this "spin the wheel and count how many times the driveshaft rotates thing?? they are telling me in the 4 section that it should spin 3 , almost 4 times if its a 3.73 so is that wrong? and the other guy (7upedition) said i should have more than 19 teeth on the speedo gear, so im not sure whats what...and yeah i plan on getting a tbird 8.8 disc brake rear before i get a 351
ORIGINAL: Twister
you have a non-locking 7.5 rear end with a 3.73:1 rear end...a 5.0 should destroy it. No 5.0 came with a 3.73 stock after 1985
ORIGINAL: 4bang93stang
where is the axle letter on the door tag? down on the bottom where it has trim and stuff it says "ax" and under that it says "6"
where is the axle letter on the door tag? down on the bottom where it has trim and stuff it says "ax" and under that it says "6"
ORIGINAL: 7upedition
look on your door sticker and if the axle letter is W then you have 3.73, if its M you have 2.73.... it's possible they are 3.73, easy way to check is pull your speedo gear ont he side of the tranny and count how many teeth it has if its more than 19 they are 3.73's most likely it will be a 21 or 23 tooth gear
look on your door sticker and if the axle letter is W then you have 3.73, if its M you have 2.73.... it's possible they are 3.73, easy way to check is pull your speedo gear ont he side of the tranny and count how many teeth it has if its more than 19 they are 3.73's most likely it will be a 21 or 23 tooth gear
5th Gear Member
Joined: Jan 2006
Posts: 2,645
From: So-Cal
RE: how to determine rearend gear ratio??
ORIGINAL: 4bang93stang
so whats all this "spin the wheel and count how many times the driveshaft rotates thing?? they are telling me in the 4 section that it should spin 3 , almost 4 times if its a 3.73 so is that wrong? and the other guy (7upedition) said i should have more than 19 teeth on the speedo gear, so im not sure whats what...and yeah i plan on getting a tbird 8.8 disc brake rear before i get a 351
so whats all this "spin the wheel and count how many times the driveshaft rotates thing?? they are telling me in the 4 section that it should spin 3 , almost 4 times if its a 3.73 so is that wrong? and the other guy (7upedition) said i should have more than 19 teeth on the speedo gear, so im not sure whats what...and yeah i plan on getting a tbird 8.8 disc brake rear before i get a 351
ORIGINAL: Twister
you have a non-locking 7.5 rear end with a 3.73:1 rear end...a 5.0 should destroy it. No 5.0 came with a 3.73 stock after 1985
ORIGINAL: 4bang93stang
where is the axle letter on the door tag? down on the bottom where it has trim and stuff it says "ax" and under that it says "6"
where is the axle letter on the door tag? down on the bottom where it has trim and stuff it says "ax" and under that it says "6"
ORIGINAL: 7upedition
look on your door sticker and if the axle letter is W then you have 3.73, if its M you have 2.73.... it's possible they are 3.73, easy way to check is pull your speedo gear ont he side of the tranny and count how many teeth it has if its more than 19 they are 3.73's most likely it will be a 21 or 23 tooth gear
look on your door sticker and if the axle letter is W then you have 3.73, if its M you have 2.73.... it's possible they are 3.73, easy way to check is pull your speedo gear ont he side of the tranny and count how many teeth it has if its more than 19 they are 3.73's most likely it will be a 21 or 23 tooth gear
3rd Gear Member
Joined: Jul 2006
Posts: 845
From:
RE: how to determine rearend gear ratio??
if its a 7.5" rearend from an 85 or older v8 car or any year 4cyl it may have 3.73's. they were common in 4cyls. if it was from a newer 5.0 car (86+) than it did not come with 3.73's factory.
v8's didnt come with 3.73 in the fox era, early v8's with 7.5s got 3.23s at best, 3.73's are very common in 4cyl automatic cars.
look at the door tag and under ax it should have a letter, not a number
v8's didnt come with 3.73 in the fox era, early v8's with 7.5s got 3.23s at best, 3.73's are very common in 4cyl automatic cars.
look at the door tag and under ax it should have a letter, not a number