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The flywheel ring gear choices for the 4 cylinder Willys jeeps are…
97 tooth ring gear
124 tooth ring gear
129 tooth ring gear
97 tooth goes with MB and 2A and uses the MZ4113 or MZ4124 starter which have 10 tooth pinion. This starter mounts with two 3/8" bolts. The bell for this setup is the early bell with the bushing in the back face for the starter shaft.
124 tooth is for the early CJ3A and early M38. It uses the MZ4137 or MZ4162 both kick pedal starters, or the MZ4163 from the Hudson which will allow key start. All are 6 volt & 9 tooth pinion. The M38 uses a 24 volt starter. This uses the same bell and adapter plate as above.
129 tooth goes with the late 3A, late M38, 3B & CJ5/6. All those starters are the large flange starters ( 9 tooth pinion) ( 6, 12 & 24 volters available) that mount with two 1/2" bolts so the bell and adapter plate are different. This bell also has 3 more bolt holes each side for 5/16" bolts that go through the reinforced rear flanges of the these late blocks and does not have the bushing for the starter shaft since these starters are the closed nose type with built in bushing support for their shafts.
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