The engine code is F0519CA. CA (according to the CD) means 230 with 3-speed overdrive. The overdrive is the part I don't get. Does my car have overdrive? I can't figure what the 3 gear ratios are for my transmission. Here's more.
I wish you'd written me for the answers to some of your questions instead of posting it here, but I'll try to help.
The CA suffix code is shown for a 230 6-cyl w/3 speed overdrive. Whether your Chevelle still has the overdrive seems to be the question. Look at the top photos on the Transmission page and see if yours does indeed look like the top transmission or the second one.
The trans code is S7E31. S is not listed on the CD as a possible option. The CD lists "D" as the code for Saginaw.
Are you talking about the code on the POP vs a stamping on the transmission? The 1966 Saginaw 3-speed with overdrive does indeed have the letter "S" for a Saginaw 3-speed w/OD for Chevelles; the 1967 version uses the letter "D" for Chevelles and "S" is shown for a Saginaw 3-speed in passenger cars and light trucks EXCEPT overdrive. Since the CD is about Chevelles, full size car/Camaro/Corvette/Nova information isn't listed. The dating format appears to be a 1967 format where the month is a letter and different from the 1966 dating format where the month is a number. It's entirely possible that my resource materials are incorrect with the trans ID code of "D" or "S" but it's also possible (1) the transmission was changed at some point or (2) the incorrect transmission was installed. The CA and CB coded engines are identical but the CA (w/OD) would have extra linkages installed.
The overdrive is actuated by a manually operated lockout switch located under the instrument panel to the right of the steering column. Does you car have such a switch? I have a photo of one on a 1966 Chevelle that is on that CD but don't ahve a photo of one on a 1967 Chevelle.
Let me know if the "S" is on your POP or on the transmission itself. Could you send me a scan or clear photo if it is and I'll certainly make the revision if it's on there. If it's not on the POP, what is on the POP?
The "Power Teams" section of the CD lists 3.36 as the standard axle for a 230 3 Speed. It lists 3.70 as the only axle for an overdrive. My axle code is CB0525B. CB corresponds to 3.36.
So this is correct, correct?
The Trans Type (Block 1) of the body broadcast sheet lists "3C." The C means "column" and I assume the "3" means 3 speed, but again this is not listed on the CD (which has "M" for manual, "P" for powerglide, or "T" for turbo).
I assume you mean your body broadcast sheet lists 3C? I have no examples or resource to go by for a 3-speed equipped Chevelle so I hesitated to list it that way. However, being a manual shift transmission car and a column shift, a 3-speed would be the only choice. Again, if you have a copy of your BODY BROADCAST SHEET, I'd like to see it (and use it) for future updates.
The transmission section of the CD lists 2.85/1.68/1.00 for the "GM Standard 3 speed manual" for the L6 and 2.86/1.72/1.00 for the Heavy Duty version. The only overdrive gear I see in that chart is listed for the TH400 (2.48/1.48/1.00/.78) which I thought was a three speed.
You are quite right here, the TH 400 has NO 4th gear or overdrive. My typo and that column should read n/a
. I was thinking of the 4L80E (an OD version of the TH400) and that was much later. That will be fixed.
The 3-speed O.D. was different from other, modern O.D. transmisisons in as much as it didn't just work with the 1:1 top gear. It could be engaged in any gear to reduce that gear. The normal 1st gear went from 2.85 to 1.995, 2nd gear went from 1.68 to 1.176 and 3rd gear went from 1.00 to 0.70 - each gear could experience a 30% reduction individually.
So I believe I have a 3 speed Saginaw with a 3.36 axle, but I can't figure what the gears are. Does this really have an overdrive?
* According to all sources, the CA engine code was suppose to have an overdrive.
* The S7E31 should be a full size car overdrive code but mistakes are possible.
* You'd have to physcally check the transmission to see if it still has the overdrive.
* And it'd be nice to know what's on the POP in the transmission section.