727 Disassembly and Advice
Leave your 64 trans under the bench. The rear drum should be replaced but u could have someone with a lathe skim the rust off. I’ve never seen a spacer like that under the acc. I usually use a blocker rod. The front servo is the older style from about 66 to 70. Newer tranny’s use the tri star washer on the output shaft. Likely u have a lock up tranny. Does the input shaft have splines all the way to the end or is the last 3/4 inch necked down and smooth. The front drum with 5 clutches and steels may be the thinner ones. Usually the drum has 4 clutches and steels. Does the rear servo have a spacer in it and a heavier thicker spring? U may be able to sand/soda blast the rust off the other parts or soak them in evaporust. Kim
I do not have a lockup transmission, it has splines all the way to the end of the shaft. Good to know about the washer though. I'll have to measure the clutches and steels to see what the size is before I order new ones, if I even have to. I'll be taking those apart today to check the life on them. Here is a picture below of my Rear Servo.
I've seen some people do some odd things to transmissions over the last three decades or so. I cannot say I've ever seen what looks to be a GM speedometer drive gear put on the accumulator like that. At any rate, you can just discard that and leave the accumulator with no springs or find a spring that goes on top of the accumulator towards the valve body. The spring will slightly cushion the shift, no spring will firm up the shift.
As for the rust I wouldn't be worried about any of that at all. It will blast off in a blast cabinet with glass bead media. Or, as was mentioned you can spin them in a lathe with a scrotchbrite pad.
As for the early '70-back 2nd gear servo, well someone just installed it in favor of the late 5/8" rod single spring servo--for whatever reason, perhaps the original one was worn or damaged. Some folks think the early small rod, two spring servo works better. If you keep the early servo, find an outer spring for it. The old school thinking of removing springs from apply servos is wrong. The whole idea is to get the band off quicker to avoid 2-3 bind or overlap.
I'd not mess with the push button transmission as not much will interchange. That could be a valuable core to someone, and is even more valuable left assembled.
My application is just going to be a cruiser, nothing crazy, so would you recommend I get a spring for the accumulator or leave it without the spring? I do not have access to a blast cabinet, my work does have a lathe but it hasn't been used in forever, and another member here mentioned just wire wheel, and I do have access to bench grinders with finer wire wheels and scotchbrite wheels. Would those work, or should I stick to a blast cabinet or lathe?
I intend to keep the early servo since I have it right here, no reason to get a whole new part. I'll look online for a spring and see what I can find.
I'll also avoid getting into my 64 push button then. I still have to take it out of my 65 Dart which it was put into at some point, but I'll probably leave it as is.
The gear on the servo is a VERY old school trick to use as a blocker for the servo. It firms up shifts some. That is a speedometer drive gear from a transmission output shaft.
Interesting bit of information there, this trans was supposedly left sitting for 30 years so it could be that someone did that much longer ago and just left it.
What is it that you are calling a "clutch ring"?
I've been inside a few of those tranny's (admittedly not as many as some people have) but enough to know I've never heard of a "clutch ring"
I believe that's a mistake on my end, this is my first transmission teardown so I'm not great with all the names, I just meant the clutch plates.
Get the rust and grit out of the trans, use a wore wheel on a bench grinder. do not be haphacpzzard about cleanliness.
Forget the 64 trans, too much different and will just confuse you.
I'll look into that as an option. I may have the option to use a lathe, but if not I do have access to bench grinders with wire wheel and scotchbrite wheels so I'll look into it.