Has anyone ever seen a 37 tooth ring gear. It is not recessed like a Ruckstell Gear. It has a slightly smaller diameter than a 40 tooth. I assume it would be used with an 11 or 10 tooth pinion. Any help? Glen
I forgot to mention that the ring gear bolt holes do not go all the way through and you have to use shortened bolts.
I can't believe no one has commented. A 37 tooth ring gears is pretty uncommon! Glen
Here you go Glen. Most likely no-one else has seen one. Used with a standard 11 tooth pinion gear it would give a 3.35 ratio, quite handy as a usable overdrive.
Allan from down under.
While working on a friends early axle using studs (rather than bolts) I realised that a 13 tooth pinion cannot be installed in a stud axle as the gear diameter is greater than the hole between the two axle halves. So maybe this 37 tooth ring gear was a way to get a higher ratio with a studded axle.
Just a thought.
3.36 would be a happy medium between stock gears and 3 to 1. A 10 tooth pinion would give you 3.7 which would be a little higher than 4 to 1. Sounds like a very good ratio. Have never seen one before. Glen
I have known a couple people that had recessed 36 tooth ring gears for use with 13 tooth pinion gears. That gives a nice high top gear for a speedster with a Ruckstell for stepping up with.
I also saw (on this forum a few years ago) photos of a 37 tooth gear for a model T. There was a bit of discussion about it, and I personally counted the teeth in the photos a few times to be certain of the count. However, I cannot say with certainty whether it was recessed for a 13 tooth pinion or not (but I think it was).
I have (years ago) seen several original ads for special gears for model T Fords, a few from the mid '10s. I suspect Tony B may have it right. A few people needed such things that early. Think about the ice racing on the Great Lakes.
A 40 tooth ring gear with a 12 tooth pinion is 3.33. Sounds awful close to me. Thats what Iam putting in my 27 Coupe. I also have a Ruckstell. Scott