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Hi,
I’m new to these gearboxes and looking for a 8/35 crownwheel and pinion for a swingaxle gearbox I’m rebuilding.
I have so far found there are (at least) 2 different style of pinion shafts, ones with splined 4th gear with a clip on the end of the shaft and ones with a keyed 4th gear and a nut on the end of the shaft.
I’m looking for the former style of pinion shaft and was wondering if its possible to identify which style (and ratio) is in the gearbox by looking at the gearbox code and the casing numbers?

AB gearbox code should confirm the ratio (4.375)

But would anyone be able to confirm if the part number on the gearcase 001.301.173 would indicate the pinion shaft will be one with a splined 4th gear and a clip on the end of the shaft instead of a nut?

Or am I missing something?

I think the switch from keyed with nut to splined with clip happened around 1968-69, so any gearbox after then will have the one you want. If you post the gearbox serial number, many on here will be able to date it.

This gear carrier, 001.301.173 is from an autostick. The autostick pinion shafts are a lot shorter than the ones for 4 speeds, so that's no good to you.

The change in the pinion you describe did not require the gear carrier casting to change, so reading its part number won't help.