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Can anyone tell me what this part is? I have a 63 Muncie 4 speed M20 transmission....in my 65.
Thanks,
58n65
Yes, that is definitely a broken 70’s era TCS switch. The pic below is typical of what they looked like unbroken. You either have a later year side cover or transmission.
Mike is no doubt correct - I've never seen that and it didn't exist on a '63 Muncie (I have one) so I'm betting its a replacement side cover...
I bet it's a replacement cover. The number stamped on the side is 3831704 and the little tag number is 3831703. Unless I'm wrong, that's a 63 Muncie correct?
I'm going to have a mechanic friend help me put seals in it so I want to buy the correct parts.
This car never ceases to amaze me. Not knowing anything about these cars when I bought it, I expected it to be nearly original. Glad I got a good price for it!!!
Your side cover is at least a '69/later part. Witness bolts holding the shft arms on instead of nuts and the pivot pin with the head on it for the shifter forks. That's along with the TCS switch. What is the casting number on your side cover?
Your side cover is at least a '69/later part. Witness bolts holding the shft arms on instead of nuts and the pivot pin with the head on it for the shifter forks. That's along with the TCS switch. What is the casting number on your side cover?
Thanks MikeM. The casting number is 3119751. I plan on using this tranny unless there's a reason not to. It's not a numbers matching car....just bought a crate 350 for it.
Everyone above is correct, it's a TCS switch (Transmission Control Solenoid switch). The solenoid which it controlled was located (USUALLY) on the intake manifold (USUALLY on the right side) next to the carburetor. The solenoid was activated when the transmission was shifted into 4th gear (or top gear of whatever transmission was in the car). The solenoid had vacuum lines connected to it for the purpose of providing vacuum to the distributor (one of the early forms of emission controls). The TCS switch was actually a grounding switch. That is, it provided a ground to the solenoid to energize it when the electrical circuit was complete. Back in the day, I, as well as many other people removed and threw away all that crap. We then just recurved the distributor and timing and ran manifold vacuum to the distributor just like was done with earlier models.
Thanks MikeM. The casting number is 3119751. I plan on using this tranny unless there's a reason not to. It's not a numbers matching car....just bought a crate 350 for it.
Thanks,
58n65
2 thoughts:
the general consensus is that the 63 Muncie is an overall 'weaker' transmission; but it certainly will be serviceable if driven sensibly..
2nd... considering it is in a later car, do you have the correct small hole bellhousing. if not, a spacer ring should be used around the front bearing retainer
Everyone above is correct, it's a TCS switch (Transmission Control Solenoid switch). The solenoid which it controlled was located (USUALLY) on the intake manifold (USUALLY on the right side) next to the carburetor. The solenoid was activated when the transmission was shifted into 4th gear (or top gear of whatever transmission was in the car). The solenoid had vacuum lines connected to it for the purpose of providing vacuum to the distributor (one of the early forms of emission controls). The TCS switch was actually a grounding switch. That is, it provided a ground to the solenoid to energize it when the electrical circuit was complete. Back in the day, I, as well as many other people removed and threw away all that crap. We then just recurved the distributor and timing and ran manifold vacuum to the distributor just like was done with earlier models.
Thanks for that explanation....well done. I guess for my engine this will not be connected either. I truly wish I knew more about engines/transmissions but it's fun learning.
the general consensus is that the 63 Muncie is an overall 'weaker' transmission; but it certainly will be serviceable if driven sensibly..
2nd... considering it is in a later car, do you have the correct small hole bellhousing. if not, a spacer ring should be used around the front bearing retainer
Makes me wonder why the guy before me picked this tranny. From what I understand he was planning on racing the car. Not me....strictly bought it to enjoy.
Not really sure what a small hole bellhousing is. I'll have to leave that up to the guy helping me install the engine.
Makes me wonder why the guy before me picked this tranny. From what I understand he was planning on racing the car. Not me....strictly bought it to enjoy.
Not really sure what a small hole bellhousing is. I'll have to leave that up to the guy helping me install the engine.
Thanks,
58n65
Its the part of trans that slips into the bell housing...
Thanks MikeM. The casting number is 3119751. I plan on using this tranny unless there's a reason not to. It's not a numbers matching car....just bought a crate 350 for it.
Thanks,
58n65
I can't find a reference for that casting number.
The main strength difference between a '63 Muncie and the later ones is the '63's used a smaller front input shaft bearing. That meant a unique bearing retainer and bearing retainer hole in the bellhousing.
The main strength difference between a '63 Muncie and the later ones is the '63's used a smaller front input shaft bearing. That meant a unique bearing retainer and bearing retainer hole in the bellhousing.
READ THE FOLLOWING CAREFULLY AND PAY ATTENTION!!!
If a person has a 63 T-10 or Muncie (with the small front bearing retainer), but has a 64-later bell housing (ala 403 or 621 for example) with the larger hole, THE IDEAL FIX is to round up a 55-62 3sp front bearing retainer (there were millions of them, many are junk today). The 55-62 bell housings and 64-later bell housings had the SAME SIZE hole in the bell housing for the tranny front bearing retainer. The small hole in the 63 ONLY bell housing was ONE YEAR ONLY! Sorta. THE 1963 4sp 409 CARS (do you guys know your 409 stuff) CARRIED OVER THE OPEN BOTTOM ALUMINUM BELL HOUSING FROM THE 60-62 HI-PERF 348 CARS AND 60-62 VETTES (with the larger hole). Thus, the 1963 B-W T10 and Muncies which were installed in 63 Full Size 409 Chevys had the SAME front bearing retainer as the earlier 3sp trannys. Most people who know this little known fact are no longer with us.
THE 1963 4sp 409 CARS (do you guys know your 409 stuff) CARRIED OVER THE OPEN BOTTOM ALUMINUM BELL HOUSING FROM THE 60-62 HI-PERF 348 CARS AND 60-62 VETTES (with the larger hole).[/B] Thus, the 1963 B-W T10 and Muncies which were installed in 63 Full Size 409 Chevys had the SAME front bearing retainer as the earlier 3sp trannys. Most people who know this little known fact are no longer with us.
I know the 409 was a pushrod bending boat anchor....
Thanks everyone for the help. It's greatly appreciated. It looks like I have a 63 Muncie 4 speed (going by casting numbers) with a 70s side cover (going by the TCS switch).
Now to buy the seals and get this thing back in the car. Will probably replaced the transmission later on. Right now I'm under the gun to get it ready for March so my daughter can take her senior pictures with it.
You could just buy one of the improved side covers with needle bearings in the shifter rod holes and seals already installed, new rooster combs and without the ugly external protrusion... Nice piece but they ain't cheap...
10-23-2016, 10:46 AM
Transmission Part Help
