CRG Discussion Forum

Camaro Research Group Discussion => Originality => Topic started by: john302 on March 05, 2018, 04:46:29 AM

Title: 1969 muncie 4spd id tag
Post by: john302 on March 05, 2018, 04:46:29 AM

Does anyone know if the transmission id tag is different from one gear ratio to the next?Because with the different gear ratios the speedo gears would be different. Need to find out what the id tag would be for a z/28 m20 with a BV410 rear. Does anyone have a z with this combo that still has there original id tag? Also do I need a speed reducer? thanks John

Title: Re: 1969 muncie 4spd id tag
Post by: 6667ss138 on March 05, 2018, 06:44:40 AM

3946797 is for RPO M20 with Z28
3946798 is for RPO M21 with Z28
3950318 is for RPO m22 with Z28

I don't believe there were different numbered tags based on the rear axle ratio but someone will correct me If I am wrong.

Title: Re: 1969 muncie 4spd id tag
Post by: Stingr69 on March 05, 2018, 01:40:50 PM

The speedo gear was matched to the specific vehicle long after the tranny was assembled so no need for a different part number.

Title: Re: 1969 muncie 4spd id tag
Post by: L78 steve on March 07, 2018, 03:06:56 AM

I believe The above tag numbers go for Z28 and L78.

Title: Re: 1969 muncie 4spd id tag
Post by: 69Z28-RS on March 07, 2018, 04:18:00 AM

Quote from: L78 steve on March 07, 2018, 03:06:56 AM

I believe The above tag numbers go for Z28 and L78.

Why would an SS with a 350 ci engine or even an L72 engine need a different part number for their M20 or M21 ???  Or were you just referencing the M22 trans?

Title: Re: 1969 muncie 4spd id tag
Post by: KevinW on March 07, 2018, 01:19:52 PM

Hmm, looking at the AIM, UPC M20-A1 has the following list:

3950376 - L6 (assume Saginaw)
3950378 - L65 & LF7 (assume Saginaw)
3950356 - L48, L34, L35 & LM1 (assume Muncie)
3946797 - Z28 & L78 (Muncie)
3950316 - M21 w/L34 (Muncie)
3946798 - M21 w/Z28 & L78 (Muncie)
3950318 - M22 w/Z28 & L78 (Muncie)

Title: Re: 1969 muncie 4spd id tag
Post by: 69Z28-RS on March 07, 2018, 01:30:11 PM

I guess my question has been answered, but I still don't understand....??

Title: Re: 1969 muncie 4spd id tag
Post by: Stingr69 on March 07, 2018, 02:04:04 PM

Keep in mind, M-20 does not always mean "Muncie".  On a 6 cylinder, or base V8 you would have a 4-speed "M-20" and get a 4 speed Saginaw tranny.

Title: Re: 1969 muncie 4spd id tag
Post by: 69Z28-RS on March 07, 2018, 02:29:28 PM

Ahhh...   Yes, I forgot that..   Thanks!  :)

Title: Re: 1969 muncie 4spd id tag
Post by: jdv69z on March 07, 2018, 11:12:18 PM

Quote from: Stingr69 on March 05, 2018, 01:40:50 PM

The speedo gear was matched to the specific vehicle long after the tranny was assembled so no need for a different part number.

So when was the speedo gear installed? On the assembly line? So was it called out on the chassis broadcast sheet?

Title: Re: 1969 muncie 4spd id tag
Post by: L78 steve on March 07, 2018, 11:49:46 PM

The reason the tag numbers are different for the solid lifter engines is the deeper rear axles. They required the small speedo DRIVE gear.

Title: Re: 1969 muncie 4spd id tag
Post by: L78 steve on March 08, 2018, 12:16:10 AM

Quote from: john302 on March 05, 2018, 04:46:29 AM

Does anyone know if the transmission id tag is different from one gear ratio to the next?Because with the different gear ratios the speedo gears would be different. Need to find out what the id tag would be for a z/28 m20 with a BV410 rear. Does anyone have a z with this combo that still has there original id tag? Also do I need a speed reducer? thanks John

I had this combo and it would not use the reducer. It would the 797 tag with the natural colored or yellow 24 tooth 3860347 driven gear.