4 replies to this topic

[fvee27]

I have two engine/tranny units that I purchased with my 1963 997 Cooper.The 997 has a 22G68 case and the 1275 has a 22G846 case. I would like to determine the gears and final drive in each unit without dis-assembling them. Is there a method to do this, and if so, how? I tried the FAQ section, but didn't find anything. Any help would be appreciated. Greg D.

[danie garry]

go to guessworks site and u can type in the engine no and it'l give u the final drive ratio among other bits of info

[Asphalt]

I have two engine/tranny units that I purchased with my 1963 997 Cooper.The 997 has a 22G68 case and the 1275 has a 22G846 case. I would like to determine the gears and final drive in each unit without dis-assembling them. Is there a method to do this, and if so, how? I tried the FAQ section, but didn't find anything. Any help would be appreciated. Greg D.

Both should be equiped with a 3.76:1. The 22G68 is an early 3 synchro 'box, the 22G846 is a 4 sync. Both are remote-type boxes w/ rubber joints.

However; it's not impossible that someone changed the diff ratio.
You can remove the speedo drive housing on the side of the gearbox to count the teeth on both crown wheel & pinion. This would cost you two gaskets, but you'd know for sure

[GraemeC]

Assuming a 'standard' 1:1 drop gear ratio you need to put the gearbox into 4th gear and turn the engine over by hand. Count how many times the output shaft rotates for one engine revolution. It could be quite inaccurate though.

However you would not need to strip the gearbox too far to physically check the gears - remove the speedo drive housing and peer into the box. Count the teeth on the pinion and on the crown wheel (you'd need to mark the crownwheel then rotate it to count the teeth)

[fvee27]

Thank you to all who helped me with this topic. I appreciate the assistance. Greg D.