rear gear numbers

[Gearhead]

could someone supply me with the numbers on the rear gear that eguals what gear ratios

 

[Bugeye58]

Which numbers are you referring to? There are numbers stamped on a pad on the housing, directly above the brake fitting, that translate into the gear ratio. For instance, the number 9 stamped over 41 indicates a 4.55.
However, this is only true for the gearset that was initially in the housing. My 4.88 is in a housing that originally had a 4.22 in it. The easiest way is to count the teeth on the ring gear, and divide it by the number of teeth on the pinion.
Jeff

 

[jlaird]

Sigh, and when you get em sorted out do as we do with the track car and use a yellow paint marker and write on them what is what and what goes to what track.

 

[Gearhead]

thanks could not remember where they were stamped the gear was from an early Spridget gears all look good bearings run smooth which years/cars had what gears do you know?

 

[Bugeye58]

The stock rear gear until December, 1968 was a 4.22. This changed to a 3.9 until the rubber bumper cars, when it was replaced by a 3.7.
The higher ratios, 4.55, 4.88, and 5.37 were found in other BMC vehicles, such as the Morris Minor, the Austin A35, or the Morris Postal van, to name a few.
Jeff

 

[GB1]

It is better to go with the stamped numbers or counting cogs, because you never now if a po has changed it.

Pat

 

[Bugeye58]

On the side of the ring gear you'll find the stamped numbers as well. On the 4.55 I have in my hand is stamped:

ATA 7109 MOWOG 9 41. The 9 41 being the key numbers

For the more common ratios, the numbers would be:

9 38 = 4.22
10 39 = 3.90
11 41 = 3.73

Jeff