I have an 87 Iroc with the 145 speedo. How common is it for the 305 automatics to have this? My 86 didn't have the 145 speedo. Was it an option or performance grouped with items like Posi?
Thanks Brian

 

my car was originally a 305 TPI auto and I have the 145 speedo as well. not sure what upgrade you had to get from 85 to 145,but I like it!