292 l6 to a 5 speed? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Captainfab** · 12-25-2014, 10:04 PM

Shaky is right. There are 2 different truck bellhousings. The typical '67 and earlier with the 4-11/16" bore for the trans input shaft retainer and the '68-'72 with the 5-1/8" bore. If your truck currently has the SM420, the bellhousing will be 4-11/16". You need to find out what the TKO500 or 600 trans requires for a center bore. If you do need a bellhousing with the 5-1/8" bore, I believe I have a couple. You could also eliminate the bellhousing crossmember and change the bellhousing to a standard GM bellhousing and just add a trans crossmember under the rear of the trans.

66Submarine · 12-25-2014, 10:15 PM

Quote:

Originally Posted by Captainfab

Shaky is right. There are 2 different truck bellhousings. The typical '67 and earlier with the 4-11/16" bore for the trans input shaft retainer and the '68-'72 with the 5-1/8" bore. If your truck currently has the SM420, the bellhousing will be 4-11/16". You need to find out what the TKO500 or 600 trans requires for a center bore. If you do need a bellhousing with the 5-1/8" bore, I believe I have a couple. You could also eliminate the bellhousing crossmember and change the bellhousing to a standard GM bellhousing and just add a trans crossmember under the rear of the trans.

The 5-1/8" bore is only a 1968 and later truck thing (at least AFAIK). The TKO's have a 4-11/16" bore like all the other old car transmissions.

12-25-2014, 10:04 PM	#1
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,254	Re: 292 l6 to a 5 speed? Shaky is right. There are 2 different truck bellhousings. The typical '67 and earlier with the 4-11/16" bore for the trans input shaft retainer and the '68-'72 with the 5-1/8" bore. If your truck currently has the SM420, the bellhousing will be 4-11/16". You need to find out what the TKO500 or 600 trans requires for a center bore. If you do need a bellhousing with the 5-1/8" bore, I believe I have a couple. You could also eliminate the bellhousing crossmember and change the bellhousing to a standard GM bellhousing and just add a trans crossmember under the rear of the trans. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE



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