If it's an automatic it's probably the 700R4
Chevy never made a 1986 IROC-Z convertible, not till '87 - so the answer is no.
No
Depends on engine...
Depends on engine and transmission...
Depends on engine and transmission...
yes
Too much... for what?
It was just an incorporation of the "Z" in Z-28. IROC stood for International Race Of Champions.....from the Nascar IROC races.
Yes, they did iroc and Z28's are a little different, but i have just a regular Z28 most iroc's a tombport as regular Z28's do not.
Yes
no, all IROC-Z's were V8s.
the last production year for the iroc z was 1990, there is no such thing as a 1991 iroc z