Transmission Identification

[Chuck D.]

Looking for more help. I have a 1962 340hp car and wanting to replace the gaskets and seals in the transmission. I don't believe this transmission is original to this car. Before I purchase another gasket/seal set which does not fit (Paragon kit for 63 thru 74 Muncie, I told them it was a Muncie) would someone with the information check these numbers for me please?? Shifter cover = 3952648, top front lip main housing and tail shaft housing = 7L122057, right side main housing = P7501, right side above fill plug = 3885018, GM Patent No. = 3088336 and lastly, right side tail shaft housing below speedometer drive = 3857584GM. I appreciate your input.
Novice Restorer Chuck (58064)

[Edward J.]

Re: Transmission Identification

Chuck, 62 should be a Borg Warner T-10 Transmission. I believe the main case has a t-10 1C cased into pass. side of housing. Muncie came about in 63 mid year of production.

[Edward B.]

Re: Transmission Identification

Chuck, the side cover is 1970-197x Muncie, the main case is 1966-1967 Muncie (should be 3885010, not 3885018, so double check that number), and the extension housing is 1966-1969 Muncie.

The main case came out of a 1967 Camaro assembled at the Van Nuys, CA plant, but check the date again. It should be P7, and then a letter, and then 01. I'm going to assume by the VIN that the letter is probably an S (November, 1966) and not a 5 since the car was assembled the second week of November, 1966.

By the way, 7L122056 and 7L122058 are both in the database, but not yours! As Don Adams would say, "Missed it by THAT much!"

Ed

[Joe L.]

Re: Transmission Identification

Looking for more help. I have a 1962 340hp car and wanting to replace the gaskets and seals in the transmission. I don't believe this transmission is original to this car. Before I purchase another gasket/seal set which does not fit (Paragon kit for 63 thru 74 Muncie, I told them it was a Muncie) would someone with the information check these numbers for me please?? Shifter cover = 3952648, top front lip main housing and tail shaft housing = 7L122057, right side main housing = P7501, right side above fill plug = 3885018, GM Patent No. = 3088336 and lastly, right side tail shaft housing below speedometer drive = 3857584GM. I appreciate your input.
Novice Restorer Chuck (58064)

Chuck-------


The transmission is a Muncie. The main case is from a 1966-67. The extension housing is a 1965-70. The side cover is from a 1970-74. So, it's likely that it's a 66-67 Muncie with a 1970-74 side cover (which will SERVICE any 63-74 Muncie).

[Chuck D.]

Re: Transmission Identification

You guys are great. Not necessarily tickled with the answer but not suprised either. Again, shame on me. Thanks!!

[Paul D.]

Re: Transmission Identification

So if the trans is actually a Muncie, and you ordered a kit for a Muncie, why didn't it work? What was different in the kit? Chip.

[Joe L.]

Re: Transmission Identification

So if the trans is actually a Muncie, and you ordered a kit for a Muncie, why didn't it work? What was different in the kit? Chip.

Paul-------


If the kit was for a 1963-65 Muncie, there are parts differences with later Muncies. Among other differences, the brass synchro rings and cluster gear shaft, both components of many rebuild kits, are different.

[Chuck D.]

Re: Transmission Identification

Chip,
The kit comes with a couple of different size gaskets for each gasket application. The gaskets for both the front bearing cover and the side cover neither will fit. I have not removed the tail shaft from the main body so not sure about those gaskets. I hope, as the tail shaft is from a corvette within the years the kit is intended for that they will work. The rear seal appears to be correct. I hope the bushings that go behind the center section cover / shifting linkage shafts are correct - don't know yet. I found a gasket set specifically for a 67 - 69 camaro muncie That covers the M20 ,21 and I believe it said 22 ($11 bucks) and hope that will do the job. Good question though, I thought a muncie was a muncie.
Novice Restorer - Chuck (58064)

[Chuck D.]

Re: Transmission Identification

Joe, the kit is suppose to be for a 63-74 (I'm assumming Corvette) transmission and was for gaskets and seals only. Do you know if the shaft seals would be different (Camaro vs. Vette) Good Grief!!!

[Joe L.]

Re: Transmission Identification

Chuck-----

The side shaft seals were the same for ALL Muncie transmissions

[Joe L.]

Re: Transmission Identification

Chip,
The kit comes with a couple of different size gaskets for each gasket application. The gaskets for both the front bearing cover and the side cover neither will fit. I have not removed the tail shaft from the main body so not sure about those gaskets. I hope, as the tail shaft is from a corvette within the years the kit is intended for that they will work. The rear seal appears to be correct. I hope the bushings that go behind the center section cover / shifting linkage shafts are correct - don't know yet. I found a gasket set specifically for a 67 - 69 camaro muncie That covers the M20 ,21 and I believe it said 22 ($11 bucks) and hope that will do the job. Good question though, I thought a muncie was a muncie.
Novice Restorer - Chuck (58064)

Chuck-------


I do not understand why you are having a problem with the side cover or rear bearing support plate gaskets. The side cover gaskets are the same for ALL 1963-74 Muncie transmissions. The rear bearing support plate gaskets are also the same for all 1963-74 Muncie transmissions. However, note that the front and rear gaskets are different and specific to each position.

As far as the front bearing retainer gasket, the 1963 and 64-65 gaskets were different than later. So, you require the 66-74 gasket. Also note that the holes in the front bearing retainer and gasket are not equidistant from each other so there is only one correct way for the retainer and gasket to be installed. The easiest way to do it is to align the "cutout" in the gasket with the oil drain hole in the front of the main case. The "trough" in the retainer must align with the "cutout" in the gasket.

By the way, in the vast majority of cases, Muncies used for any given model year are the same for all Chevrolet (and most other GM) car models of that model year. So, for instance, a 1967 Muncie used in a Camaro would be the same as one used in a 1967 Corvette. There are exceptions to this rule but they're fairly rare and of no consequence to you in this case.

Of course, there are the three Muncie variants for 1966-74 Muncies------M-20, M-21, and M-22. However, for any given model year in that range, the differences between these variants are primarily internal and do not affect interchangeability of the transmissions or, certainly, any of the gaskets you are involved with.

1966-70 Muncie transmissions of all variants use a 10 spline input shaft and 27 spline output shaft (with the exception of some 1970 Chevelles). 1971-74 Muncies use a 26 spline input shaft and 32 spline output shaft.

[Chuck D.]

Re: Transmission Identification

Thanks Joe. I'll give Paragon a call tomorrow and see what they have to say.

[Joe L.]

Re: Transmission Identification

Thanks Joe. I'll give Paragon a call tomorrow and see what they have to say.

Chuck------


Is the bottom of the side cover gasket straight or curved? If it's curved you have a Borg Warner T-10 gasket.

[Chuck D.]

Re: Transmission Identification

Joe,

It is straight and the gasket was correct - I had not taken the cover off and it appeared by laying the gasket over the cover that it wasn't going to fit. The shaft bushings are in and the other gaskets for the tail shaft housing are correct. I got two gaskets for the front bearing cover and one is to large and the other to small. The only leak I had was in the area of the side cover and/or bushings. Worse case I can reuse the front gasket with some gear oil type sealer/gasket maker. Now if I can figure out how to get the shifting forks pins lined up in their respective position, get the cover to sit back down I'll be ready to start hanging the front suspension back on the frame. As with other issues you've been a great help along with several others. Thanks again.
Novice Restorer - Chuck (58064)

[Joe L.]

Re: Transmission Identification

Joe,

It is straight and the gasket was correct - I had not taken the cover off and it appeared by laying the gasket over the cover that it wasn't going to fit. The shaft bushings are in and the other gaskets for the tail shaft housing are correct. I got two gaskets for the front bearing cover and one is to large and the other to small. The only leak I had was in the area of the side cover and/or bushings. Worse case I can reuse the front gasket with some gear oil type sealer/gasket maker. Now if I can figure out how to get the shifting forks pins lined up in their respective position, get the cover to sit back down I'll be ready to start hanging the front suspension back on the frame. As with other issues you've been a great help along with several others. Thanks again.
Novice Restorer - Chuck (58064)

Chuck------


If you use any sealer on the bearing retainer gasket, you must be absolutely certain that none of it clogs the "trough" in the bearing retainer or the drain hole in the case. If this occurs you will have a leak, for sure (out of the snout of the bearing retainer and onto your clutch disc). You must have been supplied a 1963-65 Muncie gasket kit. This kit would include the 1963-only and 64-65 front bearing retainer gasket. Neither of these will work on your 1967 Muncie.

Put the transmission into second gear and place the shifter forks in the second gear position before you re-install the side cover.