Axle ratio
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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
The RPO code inside the center console.
An axle code stamped on the front of the passenger side axle tube.
Pull the rear cover and count the ring and pinion teeth. The ring gear should also have the number of teeth stamped on the side of it.
83 Z28 has a couple of options.
LG4 engine with a manual transmission has 3.23 gears with 3.73 as an option. With an automatic it has 3.23.
LU5 engine is only available with an automatic tranny. It has 2.93 gears and 3.23 were an option
L69 engine is only available with a manual tranny and has 3.73 gears.
From those choices I'd take a good guess and say you have 3.23 gears.
------------------
Follow my racing progress on Stephen's racing page
and check out the race car
87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block
Best ET on a time slip: 11.242 altitude corrected to 10.89
Best MPH on a time slip: 121.52 altitude corrected to 125.89
Altitude corrected rear wheel HP: 497.9
Best 60 foot: 1.546
Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association
87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley
An axle code stamped on the front of the passenger side axle tube.
Pull the rear cover and count the ring and pinion teeth. The ring gear should also have the number of teeth stamped on the side of it.
83 Z28 has a couple of options.
LG4 engine with a manual transmission has 3.23 gears with 3.73 as an option. With an automatic it has 3.23.
LU5 engine is only available with an automatic tranny. It has 2.93 gears and 3.23 were an option
L69 engine is only available with a manual tranny and has 3.73 gears.
From those choices I'd take a good guess and say you have 3.23 gears.
------------------
Follow my racing progress on Stephen's racing page
and check out the race car
87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block
Best ET on a time slip: 11.242 altitude corrected to 10.89
Best MPH on a time slip: 121.52 altitude corrected to 125.89
Altitude corrected rear wheel HP: 497.9
Best 60 foot: 1.546
Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association
87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley
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