Can anyone tell me what the original driven gear in the transmission was for a 1969 442 4 speed with 3:23 rear gears. I fully understand that tire size will increase/decrease speed o reading. I currently have 225/R70-14 tires on stock rims.
I have purchased a 6 piece set of driven gears(17 thru 22) and would like to install the correct gear the 1st time to get the most accurate speed o reading.
Thanks in advance for all comments

 

 

In the 1970 Chassis Service Manual on page 4B-23, they list the 19-tooth natural for H-78 series tires, 20-tooth blue for F-78, 17-tooth purple with a .866 adapter for G-78, 20-tooth blue with no adapter for G-70. Maybe with a little digging you can come up with the circumference of each of the different series tires and match the closest to your 225/70's.

 

 

The 225-70's are a good match to the G70-14's.

 

From the 1970 chart, but it should be correct for 69. Just make sure you have the correct drive gear in the transmission, or all of this is out the window.