Stock Indy tire size was 215/60R14. Is the speedo right? Has someone changed the speedo gear?
VSS speedo gears by tires sizes from the Fiero P22 parts manual. Pages 1-5 4.337 Group.
I combined all the data from all the years into this.
Looks like there are 2 VSS gears for manuals, and 2 for automatics. The drive gears are different, 10 tooth and 35 tooth, so I don't think the VSS gears are interchangeable between automatics and manuals. ie: using a RED gear in an automatic won't work.
MD9 TH125C Automatics will have the large GREEN 10 tooth drive gear.
The smaller VSS speedo gear will be:
BLUE 30 tooth - tire sizes P185/80R13, P185/75R14, P195/70R14, P215/60R15
WHITE 31 tooth - tire size P215/60R14 MG2 Muncie/Getrag 5-speed transmissions will have a NATURAL (tan) 35 tooth drive gear.
The smaller VSS speedo gear will be:
RED 29 tooth - tires sizes P185/80R13, P185/75R14, P195/70R14, P215/60R15
PURPLE 30 tooth - tires sizes P215/60R14
M17 Muncie
4-speed transmissions will have a NATURAL (tan) 35 tooth drive gear.
The smaller VSS speedo gear will be:
RED 29 tooth - tires sizes P185/80R13, P185/75R14, P195/70R14, P215/60R15
PURPLE 30 tooth - tires sizes P215/60R14MT2 Isuzu (?) 5-speed transmissions will have a 35 tooth drive gear (color unknown).
The smaller VSS speedo gear will be:
RED 29 tooth - tires sizes P185/80R13, P185/75R14, P195/70R14, P215/60R15
PURPLE 30 tooth - tires sizes P215/60R14
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3.4L Supercharged 87 GT and Super Duty 4 Indy #163[This message has been edited by fierosound (edited 09-27-2012).]
