Stewart Warner Speedo adapters

[bcmiller]

I have a question on the correct application for these SW speedometer adapters.  Also were there at least two suppliers and two types - SW and AC?

.7333 dated N4 - 1969 April - possibly for COPOs with 14 inch tires and L78 with 4.10 gears?

.8241 dated N11 - 1969 November - possibly for 1970 Z28 with 4.10 and LS6 Chevelles?

I asked my dad about these and where they might have come from, but he is pretty old and could not remember exactly.

I think those are the two most valuable. I have 2 others with different ratios and dates shown in the pics, dated R - 1972 and V - 1976. 

[bcmiller]

Well here are the part numbers and ratios from the 1972 parts catalog. Now I guess need to cross reference the part numbers.

[bcmiller]

Looks like the .7333 might be correct for 69 Chevelle with 4.10 including COPO but not Camaro?

The images below are for 1969.

[GMAD_Van Nuys]

https://www.yenko.net/forum/showthread.php?t=152702&page=2

[bcmiller]

https://www.yenko.net/forum/showthread.php?t=152702&page=2

I have seen that. Nothing there directly answers my question.

The ones that have a part number starting with 6 are AC, part numbers starting with 3 are SW.

.7333 - the SW version is part number is 3932220

.8000 - the SW version part number is 3905497

.8241 - the SW version is part number 3950352

.8319 - the SW version part number is 3890575

.9743 - the SW version part number is 3950354

1.2020 - the SW version part number is 3950348

1.3000 - the SW version part number is 3950350

So those are the part numbers for future reference if anyone wants to look up the application.

[bcmiller]

Date codes are here via my buddy Jose.

https://www.yenko.net/forum/showthread.php?t=160435

[bcmiller]

I will see about adding the AC adapter information.

Maybe this can end up being in a report, or at least some of it folded into the transmission page.

[bcmiller]

Here are the ratios and part numbers for the AC adapters.

.777 - part number 6476736

.824 - part number 6476735

.8974 - part number 6273218

You can go here to see what the AC adapters look like.
https://www.yenko.net/forum/showpost.php?p=860798&postcount=6

[bcmiller]

Will go ahead and add the speedo gear chart since that may also come up in the future if this topic is searched.

[70z28lt1]

70Z with 3.73 got the .8241 3950352
4.10 got the .7333 3932220
http://www.gmpartswiki.com/getpage?pageid=12662

[bcmiller]

Yes I believe that is correct for 1970.

I believe some 3.31 cars with TH400 also received the 3950352 in 1970 with TH400.

http://www.gmpartswiki.com/getpage?pageid=11446

[bcmiller]

1969 and possibly other years with 2.56 gears and 8.25 x 14 tires received adapter 3925673 with 1.1111 ratio.  I will try to post a pic of one when I have a chance.

[bcmiller]

Here are the ratios and part numbers for the AC adapters.

.777 - part number 6476736

.824 - part number 6476735

.8974 - part number 6273218

You can go here to see what the AC adapters look like.
https://www.yenko.net/forum/showpost.php?p=860798&postcount=6

Pic of one of the 0.824 AC adapters.