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09-29-2019, 08:31 PM
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#1 |
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Registered User
Join Date: May 2013
Location: Utopia
Posts: 215
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HD Muncie 3 speed (RPO MC1)
My 77 2wd C10 with the 350 engine was ordered with RPO code MC1, which is labeled on the service parts i.d. sticker as a heavy duty 3 speed Muncie. It's my understanding that this was an upgrade to the standard light duty 3 speed tranny.
I'm trying to order an output seal (where the driveshaft yoke slips in) and no mention is made of this transmission for this specific part. Anyone have any info? The Timken 9613s seal is listed as fitting the "3 speed manual Tremec, the 4 speed Muncie 27 spline, and the M15 3 speed." Is this the correct part #? |
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10-07-2019, 10:00 PM
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#2 |
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Registered User
Join Date: May 2013
Location: Utopia
Posts: 215
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Re: HD Muncie 3 speed (RPO MC1)
Anyone?
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10-08-2019, 08:47 AM
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#3 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,512
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Re: HD Muncie 3 speed (RPO MC1)
I don’t if your part number is right but these guys might help.
http://www.garagemotorsports.com/muncie.htm |
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10-09-2019, 11:49 AM
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#4 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,912
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Re: HD Muncie 3 speed (RPO MC1)
GM used three 3-speed transmissions in the trucks. The parts books illustrations should allow you to ID which one you have...
According to the parts books MC1 is a Tremac 3 speed manual transmission. Tremac is the way it's spelled in the parts books. Not to be confused with the FORD Tremec... This is the MC1 Tremac 3 speed... It looks like the MC1 should be hours or even days of entertainment to service if it comes to that. On par with the HM290 or 5LM60. Note the shift rails and the lack of a side plate to service the shift forks. This is the Saginaw 3 speed illustration. This is the Muncie 3 speed illustration. Note the additional lug on the shift fork plate.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. Last edited by hatzie; 10-09-2019 at 12:04 PM. |
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10-09-2019, 01:49 PM
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#5 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,145
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Re: HD Muncie 3 speed (RPO MC1)
So is that Tremac a "toploader"?
It would have been the base three speed in Pontiac GTOs as well (if that's the case). K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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10-09-2019, 02:07 PM
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#6 | |
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Moderator
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,912
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Re: HD Muncie 3 speed (RPO MC1)
Quote:
I thought that meant the shifter and forks went through an access plate on the top of the transmission. If it means the gears are loaded through the top when it's being assembled then it's a toploader... with a side mounted shifter.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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