When/where was speedometer driven gear installed?

[Mike E.]

[Joe L.]

Re: When/where was speedometer driven gear installed?

I am having a discussion with a long-time NCRS friend. We have ascertained that the transmission metal tag on 71 LS6 cars with M22 transmissions was 3978766 WO on cars with 3.36, 3.70, and 4.11 differentials. We’ve also seen trannies with the WO stamped in black ink.
My question is this: how did the assembly line know which colored plastic driven gear to insert, and where/when was that done? I can’t imagine St. Louis having adequate separate storage areas for M22’s for each different rear end ratio.
Also, was the 90 degree adapter for the 4.11, for example, done at the same spot on the line? (GM used the adapter so they could use the same drive gear in all M22’s.)
Thanks for your input.

Mike------

The driven gear was installed at St. Louis. At what, exact point on the line I couldn't tell you and I really don't see why it matters, anyway.

The gear to be installed for any, particular car was determined by a "chart". Just how that chart determined the correct gear, I do not know. Most likely, it simply related the proper gear part number or color to be installed with each available rear gear ratio. As you point out, in some cases a speedometer adapter was required to be installed and I'm sure the chart specified that.

Starting in 1971, the same speedometer DRIVE gear was installed in all Muncie variants. So, St. Louis really only had to have 3 types of manual transmissions in their stock---M-20, M-21, and M-22.

[Ralph S.]

Re: When/where was speedometer driven gear installed?

Look below your post at similar threads the answer is there

[Terry M.]

Re: When/where was speedometer driven gear installed?

Look below your post at similar threads the answer is there

Thank you Ralph. The top thread answers the question.

[Mark F.]

^rd station on the engine dress (ED) line as shown below:

ED-0	Engine Dress Line (ED) - also includes transmission work:
ED-1	Schedule correct engine out of shipping rack and hang on engine dress line conveyor, tape broadcast copy to front of engine hook.
ED-2	Lube and install throwout bearing, install manual transmission to bellhousing. For Powerglide, remove converter shipping strap, install transmission case to block, apply air-powered dummy starter tool to rotate flexplate and drive converter bolts, and install inspection cover. Match gang-stamp holder dies to VIN on broadcast and stamp engine and transmission VIN derivatives.
ED-3	Install correct speedo gear and adapter sleeve, attach transmission rear mount and side engine mounts (including ground strap on LH mount).
ED-4	Fill manual transmission lube, on Powerglides install fill tube and fill with ATF, install dipstick (Powerglide final top-off after car-start on the Final Line when the converter has filled).

etc.....

[Mike E.]

Re: When/where was speedometer driven gear installed?

Help appreciated!