Thread: Another lesson!

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Well, I believe there are three different classes of C6 bolt patterns and you obviously have one of the other 2. It could be the FE's or the 289, 302, 351C/W blocks. You need the bolt pattern for the 351M, 400, 429, 460 engines. It is the bolt pattern that is wrong (on the tranny itself), and not the crank pilot size on your torque converter, correct? The crank pilot size on your torque converter is probably wrong as well, maybe not. With the 460 you'll need a 1.375" crank pilot on the converter.

If it were me, I wouldn't bother with the adapter plates, but rather just find the correct tranny for your block's bolt pattern.

Also, why so much stall (4500 rpm) on your torque converter? That is really high IMO, and I can't see how it would be streetable unless this is just a racing machine.

Best thing to do is to call a good tranny shop in your area and tell them your problem and see what they would recommend, that's what I would do. I've been down other "problem" roads in the past and in the end it is just so much quicker to talk to someone who has/can deal with these types of things.

Good luck!