HD Muncie 3 speed (RPO MC1) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

eric8 · 09-29-2019, 08:31 PM

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 #?

09-29-2019, 08:31 PM	#1
eric8 Registered User Join Date: May 2013 Location: Utopia Posts: 216	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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