Steering Rack - ZR-1 Net Registry Forums

onethumb · 01-10-2022

Is the 80s Z51 (2 turns lock to lock) rack a direct drop in for our ZR-1? I've been doing quite a bit of research but I can't seem to nail down anyone actually confirming that a quick rack will fit into a 90s car.

My "other" car has a similar steering ratio--so it's a personal preference, that the cars feel alike on track days. I'm fully aware of the trade offs.

secondchance · 01-10-2022

I had a 84 Z51 for 7 years. I believe 84 Z rack was faster compared to 90s ZR-1s. Whether mounting points are the same or not, I do not know.

Young1 · 01-11-2022

According to Mirrock corvette online interchange tables of steering racks.
84-85 first design
86-87 second design
88-92 third design
93-96 fourth design

Vette Guy · 01-12-2022

I think you could retrofit an 88-90 quick ratio.

The K-member is the same from 85-91 on the L98, and the same for both the 90-95 LT5 / 92-96 LT1s. I would presume any difference that would need to be addressed with regard to interchanging them would be in the high/low pressure hose connections. The last year I'm familiar with the quick ratio 13:1 vs. standard 15.5:1 steering rack was with the Z51 suspension in 1990. I don't believe it was offered with the Z07 suspension in 1991. If the 1988 L98 and 1992 LT1/5 steering racks are compatible per Mirrock's and other parts supplier's websites, I'd think you'd be able to retrofit a 88-90 Z51 rack.

Mark at Mirrock would be best to answer this question as he deals with them on a regular basis.

01-10-2022	#1
onethumb Join Date: Jun 2018 Location: Scottsdale, AZ Posts: 36	Steering Rack Is the 80s Z51 (2 turns lock to lock) rack a direct drop in for our ZR-1? I've been doing quite a bit of research but I can't seem to nail down anyone actually confirming that a quick rack will fit into a 90s car. My "other" car has a similar steering ratio--so it's a personal preference, that the cars feel alike on track days. I'm fully aware of the trade offs. __________________ Stacy Faught - 1978 Alfa Romeo Alfetta, 1983 Alfa Romeo GTV6 (3.5L), 1991 Corvette ZR1, 2018 Alfa Romeo Giulia Quadrifoglio

01-10-2022	#2
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,723	Re: Steering Rack I had a 84 Z51 for 7 years. I believe 84 Z rack was faster compared to 90s ZR-1s. Whether mounting points are the same or not, I do not know.

01-11-2022	#3
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 898	Re: Steering Rack According to Mirrock corvette online interchange tables of steering racks. 84-85 first design 86-87 second design 88-92 third design 93-96 fourth design __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.

01-12-2022	#4
Vette Guy Join Date: Jul 2005 Location: San Antonio, TX Posts: 651	Re: Steering Rack I think you could retrofit an 88-90 quick ratio. The K-member is the same from 85-91 on the L98, and the same for both the 90-95 LT5 / 92-96 LT1s. I would presume any difference that would need to be addressed with regard to interchanging them would be in the high/low pressure hose connections. The last year I'm familiar with the quick ratio 13:1 vs. standard 15.5:1 steering rack was with the Z51 suspension in 1990. I don't believe it was offered with the Z07 suspension in 1991. If the 1988 L98 and 1992 LT1/5 steering racks are compatible per Mirrock's and other parts supplier's websites, I'd think you'd be able to retrofit a 88-90 Z51 rack. Mark at Mirrock would be best to answer this question as he deals with them on a regular basis. __________________ Mark Horner President, ZR-1 Net Registry 91 ZR-1 #2016 95 ZR-1 #21 DRM-600, LPE 385