Transmissions and Drivetrain Need help with your trans? Problems with your axle?

Need help with gear ratio selection

Thread Tools
 
Search this Thread
 
Old Jun 2, 2006 | 02:52 PM
  #1  
Tuttlet's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2005
Posts: 38
Likes: 0
From: Grand Junction, CO
Car: 1987 Iroc Z
Engine: 350 ci.
Transmission: 700R4
Need help with gear ratio selection

I have a 9bolt rear with 3.27 gears in it. I am wonder what is best gear choice for gear's and where is least expensive place to get them. I drag race this car and only going thourgh the lites at like 4600 rpm. I also drive it on the streets. any help would be great.
Reply
Old Jun 2, 2006 | 03:01 PM
  #2  
TraviZ's Avatar
Supreme Member
iTrader: (2)
 
Joined: Sep 2003
Posts: 10,494
Likes: 3
From: Woodland, CA
Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
what is your trap speed and tire size?
Reply
Old Jun 2, 2006 | 03:08 PM
  #3  
Tuttlet's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2005
Posts: 38
Likes: 0
From: Grand Junction, CO
Car: 1987 Iroc Z
Engine: 350 ci.
Transmission: 700R4
My trapp speed is 101 mph and My tire size is about 25.5". I am night quite sure on the tire size. I am using a 15" rally with like a 245 50 15 tire. I will be getting some good drag tires and rims soon. Some pro stars maybee. I will proabally ask about that to when I am ready.
Reply
Old Jun 2, 2006 | 03:09 PM
  #4  
TraviZ's Avatar
Supreme Member
iTrader: (2)
 
Joined: Sep 2003
Posts: 10,494
Likes: 3
From: Woodland, CA
Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
with 3.73 gears and u should hit around 5.1 - 5.2k rpms. should be good for a tpi setup. if u run taller tires such as with drag radials or slicks, u can get more gearing out of it.

Last edited by TraviZ; Jun 2, 2006 at 03:13 PM. Reason: Automerged Doublepost
Reply
Old Jun 2, 2006 | 03:15 PM
  #5  
Tuttlet's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2005
Posts: 38
Likes: 0
From: Grand Junction, CO
Car: 1987 Iroc Z
Engine: 350 ci.
Transmission: 700R4
So 3.73 is good choice and is still drivable? What is best place to get them? This for the 9bolt.
Reply
Old Jun 2, 2006 | 03:17 PM
  #6  
TraviZ's Avatar
Supreme Member
iTrader: (2)
 
Joined: Sep 2003
Posts: 10,494
Likes: 3
From: Woodland, CA
Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
now thats the tricky part, finding parts for a 9 bolt. can't help u there. but from where u stand now and in the future, 3.73 gears would be perfect for you.
Reply
Old Jun 2, 2006 | 03:19 PM
  #7  
Tuttlet's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2005
Posts: 38
Likes: 0
From: Grand Junction, CO
Car: 1987 Iroc Z
Engine: 350 ci.
Transmission: 700R4
Thanks! Any one know where to gears.
Reply
Old Jun 2, 2006 | 05:11 PM
  #8  
Shagwell's Avatar
Supreme Member
 
Joined: Apr 2002
Posts: 4,627
Likes: 3
From: Southwest Florida
Car: projects.......
...for a 9-bolt the available ratio would be 3.70. - try reider racing or randy's ring and pinion. I heard Yukon now makes a 3.70 for the 9-bolts.
Reply
Old Jun 2, 2006 | 08:20 PM
  #9  
AlkyIROC's Avatar
Moderator
25 Year Member
 
Joined: Jul 1999
Posts: 17,263
Likes: 168
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Not sure if he's still in business but try www.diffsolutions.com 9 bolt parts are hard to find. If you order from Australia, you can get lots of stuff since that's where they're made.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Hotrodboba400
Firebirds for Sale
3
Dec 10, 2019 07:07 PM
88rscamar0
Transmissions and Drivetrain
5
Sep 23, 2015 09:08 PM
dbrochard
Engine/Drivetrain/Suspension Parts for Sale
6
Sep 19, 2015 08:13 PM
83 Crossfire TA
Suspension and Chassis
0
Sep 8, 2015 12:06 PM
UltRoadWarrior9
Transmissions and Drivetrain
3
Sep 2, 2015 08:24 PM




All times are GMT -5. The time now is 09:04 AM.