Editing Bellhousings (section)
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==Manual transmission bellhousings== ===Bellhousing to transmission bore size=== There are four main bore diameters used in the Chevy/GMC bellhousings: *4-1/4": Nova inline 6. *4-3/16": rare *4-11/16": common Muncie/Saginaw car and SM420 truck applications *5-1/8": common SM465 truck applications *5.6": less common NV4500 truck applications The 5-1/8" truck bellhousing bores can be reduced down to the commonly used 4-11/16" bore size by using a machined ring available from the aftermarket. In the case of Chevy bellhousings, there are several that are often preferred for use in modern vehicles. One is the casting number 3899621 bellhousing that fits the 11" clutch. Truck bellhousings have to be selected carefully if used in a passenger car application. Some will have a larger bearing housing hole for the transmission input shaft. There are adaptor rings made to allow them to be used. Later bellhousings used in the GM F-body cars with the Borg Warner T5 have the transmission tipped over, and there are bellhousings that have provisions for mounting a hydraulic clutch slave cylinder. A page showing this and other bellhousings and associated info is from [http://www.garage-scene.com/t5-into-ag-body/t5_install_bellhousing.htm#14060627 Garage-Scene.com] The bellhousing has to be aligned correctly to the crankshaft centerline. This will allow less wear and a smoother drivetrain. Offset dowels are available to correct this alignment if it’s found to be off. More on this page by [http://www.hurst-drivelines.com/wp-contehud/uploads/GM-Dial-Indicating-RobbMC-instructions-Revised-6-15-09A.pdf Hurst]. ===Casting numbers of some common Chevy bellhousings=== '''3704922''' 1955-'56 Cast Iron 10.5" clutch 168 tooth flywheel (1st. SBC cast iron bell housing) '''3733365''' Late 1956-'59 Cast Iron 10.5" clutch 168 tooth flywheel (2nd. and last cast iron SBC bell housing, identical to 3704922) '''3764591''' 1960 Aluminum 10.5" clutch 168 tooth flywheel (1st. SBC aluminum bell housing. Same size clutch fork boot as 37333365) '''3779553''' 1961-'62 Aluminum 10.5" clutch 168 tooth flywheel (Identical to 3764591 except with larger clutch fork opening) '''3779553''' 1961-'62 Aluminum 10.5" clutch 168 tooth flywheel (Identical to 3764591 except with larger clutch fork opening) '''3788421''' 1963 Aluminum 10.5" clutch 153 tooth flywheel (Identical to 3858403 except with smaller trans bearing hole) '''3872444''' Early 1965-'66 BBC Aluminum 11" clutch 168 tooth flywheel (Identical to 3788421 except with a larger trans bearing hole) '''3858403''' 1964-'72 SBC Aluminum 10.5" clutch 153 tooth flywheel (Basically the same as c/n 3840383. Identical to 3899621. Identical to 3788421 except with a larger trans bearing hole) '''3899621''' 1966-'74 BBC 1973-82 SBC Aluminum 11" clutch 168 tooth flywheel (Identical to 3872444) [[Category:Transmission]]
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