i'm doing a 370/A3 swap into my '01 Z..... here's the problem i ran into, yesterday i was doing a test fit with the tranny/converter, while bolting the trans to the motor i found that the converter hit the flex plate, this happened about 3/16" before the bellhousing was tight against the motor, and yes the converter was all the way back in the tranny. the flex plate is a stock LS1 plate, the motor has a crank from a '99 6.0L 2500HD, which i believe is the problem, since the crank hub is much thicker than a LS1........ i know that others have had this problem and i need input from anybody that has run into it before. i would prefer not to send the converter back to get it changed...... so i'm thinking the best way to get around it would be a flexplate that is stepped back to let the crank go up in it, i'm sure somebody makes this, but i havent found it, yet, or would a 6.0 flex plate help? any help will be very appreciated

 

I think the flat 6.0 /4L80 flexplate will work for you.

I have some if you need one.

 

how much would you need for 1 of those........ i'm also wondering if the length of the pilot on the end of the converter that goes in the crank will also cause a problem

 

I've been selling the flexplates with spacer and bolts but I think you would only need the flexplate.
$45 plus shipping for a new GM piece sound fair?

 

that is a good price, and i may get it anyway..... but what kind of power will they hold up to?? i will probably need an aftermarket sfi plate..... ive found plenty for the LS1s but havent found none for the 2500hd, im sure somebody makes it, i just havent done the right search yet

 

I've used stock flexplates at well over 800 HP.

Thick flexplates can also contribute to thrust bearing issues.

 

you sure it wasnt going completely together?? maybe your mullet was in your eyes and you couldnt see very good...how much MadDog 20-20 did you drink that night??