Join Date: Nov 2000
Location: Boerne/San Antonio, TX, USA, N.A.
I'm a novice at looking things up in the Ford Master Parts Catalog, but here's what I find: A C2AW-4210-A (should be stamped on the outer face of the ring) is shown to be mated with one of three pinions: C2AW-4610-A, C2AW-M and C2AW-J. I thought those numbers were stamped into the pinion along it's shaft, but it's been a while since I fondled one of the things. Those three combinations make up set part numbers: C2AZ-4209-A , B7AZ-F and B7AZ-K translating to 4.11s ,37 ring/9 pinion teeth. Rings and pinions are matched, mated assembly and you shouldn'r mix one from one set with one from another. I've not experienced what can happen when you do, so I don't know it that could be a cause of your troubles. With ten teeth on the pinion, I'd wager it could very well be a "sticking" point.
P.S. The source for that information is the 65-72 catalog, and it doesn't list 3.70s used in 9 inches during that period of time, but Ford did earlier than that. Someone with the earlier catalog coverage could maybe see if that ring was somehow mated with a 10 spline pinion to make up a 3.70 R&P. In my Hollander, the 37/10 R&P that make up the 3.70 ration is shown with part number B7AZ-M, But it doesn't give the individual R&P part numbers.
Tom (Johnson) Kubler, a.k.a. 289fan, HiPo289fan, TJinSA, Fy A. Thyrio, & various other unmentionable names.
The A.B.C.s of the '66 GT350- Accelerometer, Beatermeter, Clock