Transmission codes on Framingham Build Sheets for 69 Chevelle

[sixt9rsx33]

I have seen a few different codes in box 28 of Framingham Build Sheets. Unfortunately pieces of the build sheets are not present so I can't reconcile the code with the nomemclature of the transmission that came in the car. I have seen XD, XF, and XI. I am assuming one code is for a M-20, M-21 and M-22? I have looked on the web and can't find anything. Any one know?

Thanks

[Viz]

I can only tell you what my 69 Chevelle build sheet shows, I don't know if it would match up to Camaro build sheets.

I bought it new, small block 350, so I know it all matches the build sheet. Box 28 on the tank build sheet is XG, and the transmission option list on the sheet shows M20 4 Speed Trans. I assume it is the wide ratio.

Viz

[sixt9rsx33]

Thanks Viz...My 69 Chevelle L78 has the XD code, but the original tranny is long gone. So assuming it was a M-21. I saw a build sheet on another 69 L78 Chevelle with a M-22 and it was coded XI. Both Framingham cars. Viz is your car a Framingham built car?
Would like to know what all the codes stand for on the build sheet similar to what you can find for Mopar. I only have a partial build sheet for my car. The left side of the sheet that shows up to box 96.

[L78M22Rag]

My Framingham built 69 L89 Chevelle has XD in box 28 corresponding with the M21

[Spike]

My Framingham built 69 L78 Chevelle build sheet is coded XF in box 28 and also calls out the M21 Trans on the options.

[sixt9rsx33]

Well I guess my theory does not hold water then? I guess XD and XF were M-21. Hopefully someone will chime in with a M-22 and has a Framingham build sheet.

[ZLP955]

Perhaps the rear end ratio also influenced the build sheet code?

[Spike]

Could be?
box 29 on my build sheet is KF
Option callout is G80 3.55 Posi Axle

[SS69chevelle]

These are the codes I have for that box from different build sheets in my records. I will check some of the Framingham ones and see if they have anything different.

XC- M20
XG- M20
XD- M21
XF- M21
X1 or XI - M22


take care Andy

[SS69chevelle]

Checked several of the build sheets and portions and they seem to only use the codes below for the four speeds. the other codes may be used but I do not have any examples of them.

XC- M20 L48, L35
XG- M20 L35
XF- M21 L78
XI - M22 L78

take care, Andy