flexplate to converter clearance problem

[87berger]

Has anyone had this issue, i have a stroker crank and a cat sfi flexplate and a 10 inch ptc converter and there is zero clearance for the converter to float? any solutions would help thanks

 

[Dusty Bradford]

Yes it's been an issue with a lot of these aftermarket parts. Crank pilots not sized correctly, mounting flanges off spec. You have a couple options. Try a stock flexplate to see if it's any different or send the converter back to have the mounting pads cut down. But they will need to know how much to cut off the pads.

The converter is fully seated in the trans correct?

 

[87berger]

i need about 1/8th cut off for clearance the tranny shop said i will only have about 3 or 4 threads left to bolt into? and are worried that i wont be able to keep them tight. if the welds werent so close to the ears i would do that and just install longer bolts and a nut ? do u have any input on the j w flexplates instead of the cat? thanks

 

[87berger]

yes the converter is in all the way.

 

[Dusty Bradford]

i need about 1/8th cut off for clearance the tranny shop said i will only have about 3 or 4 threads left to bolt into? and are worried that i wont be able to keep them tight. if the welds werent so close to the ears i would do that and just install longer bolts and a nut ? do u have any input on the j w flexplates instead of the cat? thanks

An 1/8th is a lot to remove. I would try another flexplate before modifying the converter. Try the stock one 1st to see how it fits. If the stock one has enough clearance, you know the issue is the CAT. The JW stuff is usually good but I don't like "the wheel" or whatever the solid flexplate is. A flexplate needs to flex for a reason. The solid JW wheel doesn't have enough flex IMO.

 

[87berger]

ok thanks, ill start doing some checking tonight

 

[ericttype]

i have a cat flywheel and a steel crank the difference i measured was about 0.90 thousands the flange on the crank was 0.35 thicker then the turbo crank flange the rest was the cat sfi flywheel .055 thicker then stock, i made a .100 metal spacer to go in between the block and the trans, my precision converter was tight on the stock setup, good luck

 

[Dusty Bradford]

i have a cat flywheel and a steel crank the difference i measured was about 0.90 thousands the flange on the crank was 0.35 thicker then the turbo crank flange the rest was the cat sfi flywheel .055 thicker then stock, i made a .100 metal spacer to go in between the block and the trans, my precision converter was tight on the stock setup, good luck

Yes. A mid plate will also work by moving the trans back away from the engine.

 

[WS6]

So, what should the minimum clearance between the convertor pad(s) and flexplate be .125 or can it be smaller like .060?

Thanks.

 

[ericttype]

So, what should the minimum clearance between the convertor pad(s) and flexplate be .125 or can it be smaller like .060?

Thanks.

my precision says 0.60 min to .187 max

 

[WS6]

Interesting, .187 is like 3/16", that's bigger than I was expecting. You think that is typical? or specific to your convertor.

Thanks for the reply....

 

[ericttype]

Interesting, .187 is like 3/16", that's bigger than I was expecting. You think that is typical? or specific to your convertor.

Thanks for the reply....

for my precision they are the specs im sure dusty will chime in

 

[SSedan64]

TCI's Specs>> TCI - TECHNICAL INFORMATION: Frequently Asked Questions 1/8" to 3/16", .125" to .1875" and Trans not installed Bellhousing to TC Pads = 1-1/8".

 

[Dusty Bradford]

1/8" to 3/16" is the usual standard.