Apparently a few were left over from '88 however. My early '89 Z51 has fast ratio. 2 turns lock to lock.
Rack & pinion ratios....
Thread Starter
Burning Brakes
Joined: Apr 2006
Posts: 787
Likes: 2
From: Ontario
Rack & pinion ratios....
Hi.....what is the stock ratio for a 95 Cpe? Is there a quicker ratio box that can be used from previous years? Is ther any modifications that need to be done to use the quicker ratio box?
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
There were only two steering options.
Std and a faster ratio rack that came with the Z51 package.
Top of my head;
3 1/2 turns lock to lock on the std and 2 3/4 on the Z51.
Believe racks are straight swap if from year series
pre /post '88
Std and a faster ratio rack that came with the Z51 package.
Top of my head;
3 1/2 turns lock to lock on the std and 2 3/4 on the Z51.
Believe racks are straight swap if from year series
pre /post '88
Pro
Joined: Mar 2006
Posts: 663
Likes: 1
I read that the quick rack was only found on the Z51 cars, but I looked up steering rates in a Corvette book I have from the late 80's and it listed some of the Z52 suspension cars with quick steering ratios.
The rack I just bought is 2 turns lock to lock, and it came from a 17 inch wheel convertible with Z52 suspension. So if you want one, they can be found, and not just on Z51 cars. (And I'm putting mine in a 91 ZR1 so if you wanted it you could do it too)
The slow rack is 2 1/3 turns.
fast = 13.0:1 ratio
slow = 15.x:1 ratio
I also read the quick rack was phased out after 89 because cars were getting faster and made to be softer suspension-wise with slower steering as the standard to remove twitchiness at high speeds.
The rack I just bought is 2 turns lock to lock, and it came from a 17 inch wheel convertible with Z52 suspension. So if you want one, they can be found, and not just on Z51 cars. (And I'm putting mine in a 91 ZR1 so if you wanted it you could do it too)
The slow rack is 2 1/3 turns.
fast = 13.0:1 ratio
slow = 15.x:1 ratio
I also read the quick rack was phased out after 89 because cars were getting faster and made to be softer suspension-wise with slower steering as the standard to remove twitchiness at high speeds.
Last edited by Barbara_S; Jan 14, 2007 at 01:14 PM.
Safety Car
Joined: May 1999
Posts: 3,651
Likes: 5
From: Atlantis
Cruise-In I Veteran
More Info Please Need More Input Need More Input
Hey guys,
I've been meaning to start a thread about this for a long time.
Hope you don't mind LT1Vette.... if I borrow yours.
I have a '91 with the 'slow' box. I have an '84 with the 'fast' box.
84= Much Better Feel
What is the part number for the FASTER RATIO Rack that will fit my '91 with no modifications?
Is it the ZR1 rack????
Where's the best = cheapest place to get one?
I think this would be an excellent mod for my '91.
I've been meaning to start a thread about this for a long time.
Hope you don't mind LT1Vette.... if I borrow yours.
I have a '91 with the 'slow' box. I have an '84 with the 'fast' box.
84= Much Better Feel
What is the part number for the FASTER RATIO Rack that will fit my '91 with no modifications?
Is it the ZR1 rack????
Where's the best = cheapest place to get one?
I think this would be an excellent mod for my '91.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Pro
Joined: Apr 2005
Posts: 590
Likes: 0
From: Boynton Beach, FL
The fast steering rack that will fit post 88 cars was only available from 88 through mid 89 on Z-51 cars. The rack is 2 turns lock to lock and has code "NS" on the pinion cover. The standard rack is 2.5 turns. The part number for the NS rack is 26044836, service part number 26011480 and was discontinued on Z-51's half way through 89. Pre 88 racks will not fit on post 88 cars. I just put a fast rack on my 93. It was a rebuilt unit from TRW and it was NOT easy to find. 
Larry
Larry
Pro
Joined: Mar 2006
Posts: 663
Likes: 1
Hey guys,
I've been meaning to start a thread about this for a long time.
Hope you don't mind LT1Vette.... if I borrow yours.
I have a '91 with the 'slow' box. I have an '84 with the 'fast' box.
84= Much Better Feel
What is the part number for the FASTER RATIO Rack that will fit my '91 with no modifications?
Is it the ZR1 rack????
Where's the best = cheapest place to get one?
I think this would be an excellent mod for my '91.
I've been meaning to start a thread about this for a long time.
Hope you don't mind LT1Vette.... if I borrow yours.
I have a '91 with the 'slow' box. I have an '84 with the 'fast' box.
84= Much Better Feel
What is the part number for the FASTER RATIO Rack that will fit my '91 with no modifications?
Is it the ZR1 rack????
Where's the best = cheapest place to get one?
I think this would be an excellent mod for my '91.
My opinion is different - I think 88's with 17 inch wheels came with either Z51 or Z52 suspension options -and I found a convertible with 17" wheels on car-part.com at a yard. Since yards don't know RPO codes, to tell me anything else about the car, I had the yard turn it for me before buying it, and came up with just under 2 turns lock to lock - that sort of said to me, the Z52 has the quick steering also. There were enough 88's listed that had 17 inch wheels to be able to get one from a car with under 60000 miles too.
Hate to beat a dead horse but here's a neat write up from caranddriver on the 3 different suspensions and it mentions that Z52 also had the quick steering.
http://www.caranddriver.com/roadtest...ariations.html
From this page it says:
The next step up is the new Z52 suspension. For an additional $470, you get a solid and thicker front anti-roll bar, Delco/Bilstein gas-charged shocks, a 13.0:1 steering gear........
Last edited by Barbara_S; Jan 15, 2007 at 10:16 AM.
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