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M-11/M-11B/M-12 Rear Seal? |
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RovDyr71
AMC Apprentice Joined: Jun/23/2012 Location: Denmark Status: Offline Points: 71 |
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Posted: May/10/2015 at 2:00pm |
Hey guys
Just cleaned up my transmission and decided to fix a pan leak and a rear seal leak while it was out of the car... I got the old rear seal out and was ready to put a new one in... But eh, the new seal has a too large ID, it's 1-1/2" and the rear shaft is 1-1/4"?!?... The seal was from one of those M-11/11B/12 combo rubber/seal/cork kits, pretty sure I got it 10 years ago or so from AmericanPerformance in Florida, not 100% sure though... Regardless since different shafts with different OD's exist then it cannot be a real 'combo kit' with only 1 rear seal in it... Then I read some old threads here and after reading one of them I realized that I have no sure way to know what transmission I actually have... Which ofcourse makes research worse... Anyway, this is what I know... - The case has the 12-1 number on it... - It has 2 bolts on the servo (so I guess it's not a M-11, could still be a M-11B though) - The car is born with a P-code 360 and it's an export model (kmh on the speedo vs. mph) built in Nov 70, came to Denmark in early 1971 and therefore could indeed be born with an M-12. Any ideas on what this model transmission is? - The 1-1/2" seal I have has "15.620" written on it (I guess it must be the CR-15.620 seal, if the writing is correct) and... What seal do you guys use on a 1-1/4" rear shaft? Thanks |
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AMC Javelin SST '71
360-4V-M-11B |
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madmax
AMC Nut Joined: Sep/18/2008 Location: grain valley,mo Status: Offline Points: 397 |
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does the output shaft have 16 or 28 splines?
if 28 it uses the same seal as the t 10 8160s i think is the part number. i will double check when i am at my shop and repost if it is wrong. i reposted correct number 8160s is correct seal for 28 spline Edited by madmax - May/11/2015 at 4:50pm |
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American Heavy Metal
restoration parts and mechanical restoration services 70 amx black 1968 kaplan amx ss/racecar 1969 amx racecar 1970 trans am javelin 1969 amx white/platinum 1972 gremlin |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5787 |
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M12 has a larger seal and that is the one you will find in the kits, the 11 and 11B have a smaller seal.
11B is pretty much a 12 with a small output shaft from what I can figure out and pretty sure the 11B is what you will find behind a 360. |
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RovDyr71
AMC Apprentice Joined: Jun/23/2012 Location: Denmark Status: Offline Points: 71 |
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Thanks both
First of all, apparently I'm an idiot... Lol, some brain-malfunction had me measuring the output OD from the trans instead of the yoke OD. So it's not 1-1/4" (well the trans-side is) it's 1-5/8" instead. I assume a 1-1/2" seal fits the 1-5/8" OD yoke or am I totally way out here? Madmax, It has 28 splines, but is this the 'large' output then? WesternRed, Same question I guess, is this the small or large output shaft? |
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AMC Javelin SST '71
360-4V-M-11B |
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5368 |
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28 spline is the M-11 (small output shaft)....so even though the case says M-12 it is either a M-11 or M-11B...both (m-11's) use the same seal. M-12 is much larger and has less splines..
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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RovDyr71
AMC Apprentice Joined: Jun/23/2012 Location: Denmark Status: Offline Points: 71 |
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Got the CR-15.620 seal (1-1/2") installed and it does the trick.
401MATCOUPE, Roger that... Thanks I'll conclude that it must be a M-11B, since it's the original transmission behind the original late '70 P-code 360 engine... and it has the 2 bolts on the servo, 12-1 casing, BUT with the small output shaft. Thanks all |
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AMC Javelin SST '71
360-4V-M-11B |
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madmax
AMC Nut Joined: Sep/18/2008 Location: grain valley,mo Status: Offline Points: 397 |
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seal number is 8160s
rick |
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American Heavy Metal
restoration parts and mechanical restoration services 70 amx black 1968 kaplan amx ss/racecar 1969 amx racecar 1970 trans am javelin 1969 amx white/platinum 1972 gremlin |
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RovDyr71
AMC Apprentice Joined: Jun/23/2012 Location: Denmark Status: Offline Points: 71 |
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Thanks Madmax, it's always nice with some options.
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AMC Javelin SST '71
360-4V-M-11B |
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