Re-drilling a flex plate?

[jbgroby]

I have the parts needd to make the swap to the 700R4, but am being told that the flex plate holes won't line up with torque converters. Can these be drilled without major issues?

Thanks
Jake

[Chevy Fleetside]

This is for a Chevy SB? If so where is the rest of it? You can get a dual pattern flex plate.

[jbgroby]

No, this is the adaptor flex plate for mating a new 700R4 trans to a 305 V-6

[nsb29]

Why not take it to a machine shop

[jbgroby]

I can, I was just making sure it was something that had been done before but others. This is the first time I've gotten into this. Drilling a hole should be easy, I have press. I have to get a torque converter anyway.

[nsb29]

Originally Posted by nsb29

Why not take it to a machine shop

I read your post again I thought you were going to drill it for the motor but you want to drill it for the torque converter that’s going to be more difficult alignment is very important can you use a v8 flex plate and drill it ?

[SkinnyG]

Does the kit use the flywheel so you can have a ring gear, then use the Y adapter to mount the torque converter?

+1 on taking it to a machine shop.

[Brad54]

Balance is going to be your primary concern here. Things will have to be drilled EXACTLY evenly, or you're going to get shake/vibration. On reciprocating components--be it crankshaft, flywheel, driveshaft, etc., just an ounce or two will make all the difference in the world.
Don't believe me? Go duct-tape a washer to your driveshaft and drive down the highway.

[SkinnyG]

Rotating. Reciprocating is pistons and half the connecting rod.

But yeah, you don't want to wing it with a cordless Makita and expect to be happy. Machine shop, Milling machine, rotary table, win!

[nsb29]

Skinny Brought something up about the flywheel. I am not familiar with the engine you are using, so apparently the original set up used a fly wheel then the flexplate to the Torque converter. If that is the case the flex plate will have to be drilled and it will have to be dead on

[jbgroby]

I have the 305 V-6, with a solid (HEAVY) flywheel; must weigh about 40lbs. another member sent me this picture of how the flex plate bolts onto the Flywheel, then the torque converter. I’m doing my best to try and find a Torque Conv. to will line up and of course fit the shaft from the trans, but it that does not work I’m stuck with drilling. I’m trying to put in a 700R4.

The area that is circled is where the flex plate bolts to the TC. I agree that BALANCE is going to be a the thing.

[nsb29]

Yeah didn’t pay enough attention to the picture And that was a fly wheel and not a flexplate laying there. I would think this has been done before. do you have the original TC I am wondering about the thickness or size of it compared to the 700 R You need to find a torque converter and then go from there

[Brad54]

Racers have torque converters manufactured allllllll the time.
Call a torque converter company and tell them you need one for "X" transmission with mounting blocks in "Y" position.

[jbgroby]

Thank You Brad.

[jbgroby]

Brad, I'm hitting some walls on the 'net, would you have any leads for converter makers?

[lolife99]

Did you look here?
https://transmissionadapters.com/col...-to-chevy-auto

[lolife99]

Or this one,...
https://transmissionadapters.com/col...custom-vee-six

[The Rocknrod]

Originally Posted by jbgroby

Brad, I'm hitting some walls on the 'net, would you have any leads for converter makers?

Right in Bossier City, LA - https://transmissioncenter.net/produ...rque-converter
"PATC performance torque converters are manufactured in-house..."

[jbgroby]

Got her done.