Replace Saganaw with Muncie 3+granny - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**'68OrangeSunshine** · 10-16-2015, 05:06 PM

Hi . Welcome to the Board.
Quick answers:
1] Bellhousing for Muncie SM 465 requires a wider opening than the Saginaw 3-OTT bellhousing. 465 uses GM # 3925505 w/ 5-1/8" opening. Sag and Muncie SM 420 [4 speed] require GM #3815891 w/4-9/16" opening. A good machinist can open up the bellhousing, usually.
2] Don't know. Have to check my '68 C/10 stepside, w/292-SM465.
3] Yes. Both 420 and 465 require High Hump.
4] Don't know offhand. Data like that is in the Chassis Service and Overhaul Manuals.

10-16-2015, 05:06 PM	#2
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,635	Re: Replace Saganaw with Muncie 3+granny Hi . Welcome to the Board. Quick answers: 1] Bellhousing for Muncie SM 465 requires a wider opening than the Saginaw 3-OTT bellhousing. 465 uses GM # 3925505 w/ 5-1/8" opening. Sag and Muncie SM 420 [4 speed] require GM #3815891 w/4-9/16" opening. A good machinist can open up the bellhousing, usually. 2] Don't know. Have to check my '68 C/10 stepside, w/292-SM465. 3] Yes. Both 420 and 465 require High Hump. 4] Don't know offhand. Data like that is in the Chassis Service and Overhaul Manuals. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

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