292 l6 to a 5 speed?

[66Submarine]

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.