Pontiac GTO Forum banner

1 - 5 of 5 Posts

·
Registered
Joined
·
120 Posts
Discussion Starter #1
Bought a 66 LeMans 4 door parts car suprised to find a 10 bold posi under it but still can't find the letter codes without tearing it apart how can I tell the gear ratio ? 9783393 c166 only thing I can find.
 

·
Registered
Joined
·
659 Posts
You could spin the pinion one rev and count how many revs the left wheel makes. 3 1/2 times is roughly 3:55. Or you could take the pumpkin cover off and find the ratio stamped on the ring gear. In the pic 39 divided by 11 is 3:55 gear. Sorry site too slow for the pic to load, the stamp will be the first 4 numbers 39-11 GM 6 70 1
 

·
Registered
Joined
·
120 Posts
Discussion Starter #3
found ring gear stamp 14114 gm2 66e is it a 411 ? the math does not work out ?know its eaton 66 .thanx for the help.
 
1 - 5 of 5 Posts
Top