[critter]

Who's flexplate? ATI? TCI?

Was that a deep pan with the filter extension to get it back in the sump? I hear launching can uncover the stock pickup and cause cavitation. End result on that is premature death.

[HWYSTR455]

Almost certain a TCI, but honestly, would have to check. It's been since like November since I did it...

Yup, with extention (sort of), and did so because I heard the same thing, uncovering, and it also adds more fluid. As I recall, the pan I got uses 700 filters, so the exention is actually on the filter, no worry of loosing it or whatever. There were ribs on the floor of the pan that held the filter in place.

[Steve C.]

Flexplate brand ? Bolt pattern ? Bolt hole diameter ?

[HWYSTR455]

The brand is I'm pretty sure TCI, and it has dual or multi bolt patterns, 2.75 register bore. I can check, but, I know for a fact that the converter bolts fit without an issue. Soooo, I'm guessing, since the bolts are metric, that the holes are slightly enlarged. The data listed on the TCI site says 3/8", easily drilled to 7/16". If you doing a trans and you plan on replacing the flexplate, mock it up prior to assembly and drill it out if need be.

[Steve C.]

I just looked at at the 2004R swap thay did in HPP years ago. They used a early factory flexplate and enlarged the bolt holes for the slightly thicker metric bolts.

I'll use a SFI unit instead.

[critter]

I'll be going SFI as well.

What are you folks doing for the lockup?

[Overkillphil]

Steve, I have used several stock flexplates (dual bolt pattern for both 350 & 400 convertors) with the 200-4R conversions and no problems with the size of the holes and the metric bolts. So what you saw in HPP may not be typical.