Speedo reducer what's it for

[copo69]

Did the Copo's and Z/28's with 15 inch tires use a reducer with 4:10 gears?

[Kurt S]

Originally Posted by copo69

Did the Copo's and Z/28's with 15 inch tires use a reducer with 4:10 gears?

Not on Z's. Never seen a 69 Z with one (though they may be out there). Only on first gen Z's with 4.56 and 4.88 axle.

Most I've seen were in BB cars and most were 14" tires. It depended on which trans version they received - there were different speedo drive gears (shown in that chart).
I've seen 2 different adaptors used in 69 - auto vs manual - but there probably were others for the special order 4.56 and 4.88 axles.

[luv2sixty9]

Originally Posted by copo69

Did the Copo's and Z/28's with 15 inch tires use a reducer with 4:10 gears?

I'd say no for my 68 Z with factory 4:10 ratio doesn't have the reducer because of the 15" tires.