145 MPH Speedo in IROCS only?
02-09-2016, 08:11 PM
#1
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Car: 89 IROC-Z
Engine: 5.7 liter
Transmission: 700r4
Axle/Gears: Stock
145 MPH Speedo in IROCS only?
was the 145 MPH speedometer in IROCS only? I am selling one I bought a while back and a potential buyer asked me this question- is it a true IROC speedo?
02-09-2016, 09:57 PM
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Car: 1989 IROC G92 LB9 MK6
Engine: LB9
Transmission: MK6
Axle/Gears: 3.45
Re: 145 MPH Speedo in IROCS only?
IROC's had 145 speedo IF they had Z rated tires, so yes an IROC speedo but only if the IROC had the 16 wheel (QLC) tires.
02-11-2016, 03:38 PM
#5
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Re: 145 MPH Speedo in IROCS only?
2nd half production in 86 iroc or z28 as long as it was the tpi engine had 145 speedo. 87 iroc's all had 145 speedo except the base carb motor. 88-90 305 irocs had 115 speedo unless it was a G92 5 speed car. 88-90 350 irocs got 145 speedo only.
02-12-2016, 07:58 AM
#6
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Re: 145 MPH Speedo in IROCS only?
Sorry 1989 Formula, I have an 88 IROC Convertible 305 Auto and it has the 145 Speedo and I am the third owner. All original numbers matching. The 145 Speedo was part of a 'package' with upgraded rear end 16" wheel package. I believe a car that was ordered with the G80 (limited slip rear) and G92 (performance ratio axle) received the 145 Speedo.
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