quick ratio steering box
07-10-2003, 07:15 PM
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quick ratio steering box
all right guys another suspension upgrade question for my '89RS305TBI. i was wondering if i could pop in a quick-ratio steering box from an '87IROC somewhat easily??? any help again is greatly appreciated
07-11-2003, 06:56 AM
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Car: 1987 transam
Engine: 383 /w superram
Transmission: 700r4 /w 2800rpm stall
this may sound like a dumb question but whats the difreance between quick ratio and a regular gear box?
would an 87 ta have one?
would an 87 ta have one?
07-11-2003, 10:53 AM
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quick ratio steering = a lower turning radius. IROC boxes are usuallu 2.5 turns lock to lock, whereas RS boxes are 3.5 lock to lock. and if you to see if that T/A has one, check the RPO codes in the center console.
07-11-2003, 11:42 AM
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Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
When you're in the junkyards and find an IROC, check the box's casting number. It'll be 26000525, and will have a "Z" next to the number. That's the box for 16" wheels.
There was a quick ratio box for 15" wheels. Casting number will be 7826692.
Normal boxes are 2.5 turns lock-to-lock, quick-ratio boxes are 2.25 turns lock-to-lock. Never heard of a 3.5 turn box...?
The 16" wheel box supposedly has different internal stops to prevent the tires from rubbing the inner fenders on tight turns. This would only affect parking lots and K-turns and U-turns; you might have to do some extra maneuvering.
The data I saved from the f-body.org mailing list -years- ago said that the 16" wheel box locks at 2 turns instead of the 15 inch's 2.2 turns, but the actual steering ratio is the same. Can anyone verify this info?
There was a quick ratio box for 15" wheels. Casting number will be 7826692.
Normal boxes are 2.5 turns lock-to-lock, quick-ratio boxes are 2.25 turns lock-to-lock. Never heard of a 3.5 turn box...?
The 16" wheel box supposedly has different internal stops to prevent the tires from rubbing the inner fenders on tight turns. This would only affect parking lots and K-turns and U-turns; you might have to do some extra maneuvering.
The data I saved from the f-body.org mailing list -years- ago said that the 16" wheel box locks at 2 turns instead of the 15 inch's 2.2 turns, but the actual steering ratio is the same. Can anyone verify this info?
Last edited by TomP; 07-11-2003 at 11:44 AM.
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