The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Do all SM465 have the exact same trans-to-bellhousing bolt pattern?

**MJN** · 04-03-2023, 08:58 AM

One thing to keep in mind is the bottom two bolts that hold the bellhousing to the main case. Starting in '73 when they went to the cast aluminum bellhousing all four bolts thread into the bellhousing, prior to that the bottom two bolts went from the inside of the bellhousing and threaded into the main case.

04-03-2023, 08:58 AM	#16
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 2,972	Re: Do all SM465 have the exact same trans-to-bellhousing bolt pattern? One thing to keep in mind is the bottom two bolts that hold the bellhousing to the main case. Starting in '73 when they went to the cast aluminum bellhousing all four bolts thread into the bellhousing, prior to that the bottom two bolts went from the inside of the bellhousing and threaded into the main case. __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com