Camaro Research Group Discussion > Originality
Speedometer Gear Reduction Units
67 kemie ss:
I was looking up the threads on speedo gear reduction units and I had trouble interpreting what I found. I have a 69Z with its original M21 and original 3.73 posi axle. My question is, 'Do I need the reducer shown on UPC G80 sheet A2? I'm thinking that I don't, but the guy putting my car back together says it's missing. There was a question in an earlier thread as to whether hi-performance care with 15" wheels got the reducer. I didn't see an answer to that.
Thanks for any help.
JohnZ:
--- Quote from: 67 kemie ss on November 03, 2015, 08:30:28 AM ---I was looking up the threads on speedo gear reduction units and I had trouble interpreting what I found. I have a 69Z with its original M21 and original 3.73 posi axle. My question is, 'Do I need the reducer shown on UPC G80 sheet A2? I'm thinking that I don't, but the guy putting my car back together says it's missing. There was a question in an earlier thread as to whether hi-performance care with 15" wheels got the reducer. I didn't see an answer to that.
Thanks for any help.
--- End quote ---
As I recall, only the 4.56 and 4.88 axles needed the ratio adapter; other axles through 4.10 did NOT.
67 kemie ss:
Thanks John!
L78 steve:
Not 100% sure on this but like John stated 15" wheel cars no reducer up to and including 4:10s
14" wheel cars reducer used with 4:10 and up.
Would love to know for sure on this if anyone can comment. My 67 Camaro with 4:10s came without the reducer but was a racer and could have been pitched.
KurtS:
There's two different trans versions with different speedo drive gears. One is for normal gears, one for deep gears.
IIRC, 4.10 is the crossover. It could use either trans, but one trans required the adapter when used with 4.10's. So it all depended on inventory and which trans version they used.
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