what gear do i have?
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Member
Joined: Jun 2006
Posts: 391
Likes: 1
From: NC johnston co
Car: 1988 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 2.77 posi stock
what gear do i have?
ok i have an 88 iroc 350, the rear end is a 9bolt posi but i dont know what gear it is,the tag on the rearend is gone..
so anybody have any info??
so anybody have any info??
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: what gear do i have?
You have two choices, either a 3.27 or a 2.77 ratio. The 2.77 is more common. What RPM are you at while driving down the freeway in 4th gear?
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Joined: Aug 2007
Posts: 48
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Re: what gear do i have?
i am going to tell you what i did to figure out my rear ratio. i too could not find any tags on my rear, so listen closely
1- mark the end of the driveshaft that goes to the rear, and mark a spot on the rear with chalk and make sure they line up.
2- mark the tire with chalk.
3- with the car in the air, spin the tire one full revolution. take note to how many times the driveshaft spins one full revolution. once my tire spun 360 degrees, my driveshaft had spun 3 turns, and about a quarter more, so i know that i have 3.23s, or 3.27s.
if it spins a little over 3, youve got 3.08s. 3 and a half, 3.42s, 3 and three quarters, 3.73s, a little over 4, 4.10/4.11s.
simple right?
1- mark the end of the driveshaft that goes to the rear, and mark a spot on the rear with chalk and make sure they line up.
2- mark the tire with chalk.
3- with the car in the air, spin the tire one full revolution. take note to how many times the driveshaft spins one full revolution. once my tire spun 360 degrees, my driveshaft had spun 3 turns, and about a quarter more, so i know that i have 3.23s, or 3.27s.
if it spins a little over 3, youve got 3.08s. 3 and a half, 3.42s, 3 and three quarters, 3.73s, a little over 4, 4.10/4.11s.
simple right?
Thread Starter
Member
Joined: Jun 2006
Posts: 391
Likes: 1
From: NC johnston co
Car: 1988 IROC-Z
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 2.77 posi stock
Re: what gear do i have?
...----------
i am going to tell you what i did to figure out my rear ratio. i too could not find any tags on my rear, so listen closely
1- mark the end of the driveshaft that goes to the rear, and mark a spot on the rear with chalk and make sure they line up.
2- mark the tire with chalk.
3- with the car in the air, spin the tire one full revolution. take note to how many times the driveshaft spins one full revolution. once my tire spun 360 degrees, my driveshaft had spun 3 turns, and about a quarter more, so i know that i have 3.23s, or 3.27s.
if it spins a little over 3, youve got 3.08s. 3 and a half, 3.42s, 3 and three quarters, 3.73s, a little over 4, 4.10/4.11s.
simple right?
1- mark the end of the driveshaft that goes to the rear, and mark a spot on the rear with chalk and make sure they line up.
2- mark the tire with chalk.
3- with the car in the air, spin the tire one full revolution. take note to how many times the driveshaft spins one full revolution. once my tire spun 360 degrees, my driveshaft had spun 3 turns, and about a quarter more, so i know that i have 3.23s, or 3.27s.
if it spins a little over 3, youve got 3.08s. 3 and a half, 3.42s, 3 and three quarters, 3.73s, a little over 4, 4.10/4.11s.
simple right?
i give this a try
Last edited by alpine247; Jan 15, 2008 at 09:50 AM. Reason: Automerged Doublepost
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