Flexplate for th350 & 4l80e - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chappys4life · 06-29-2025, 12:26 AM

Replacing the motor in my 70 c1500. Built a 383 that is internally balanced. Looking for a Flexplate for a 2 piece seal motor that will work with the th350 that’s in it now but also would prefer it will work with a 4l80e I plan on installing down the road so I don’t have to buy a different Flexplate later.

Any suggestions?

**kwmech** · 06-29-2025, 11:13 AM

I've done a couple of 4l80 swaps and not had a problem using the 14'' flex plate that was on the engine.

chappys4life · 06-29-2025, 10:19 PM

Quote:

Originally Posted by kwmech

I've done a couple of 4l80 swaps and not had a problem using the 14'' flex plate that was on the engine.

Oh good to know. For some reason I assumed I had to change to a 6 bolt Flexplate over the 3 now

**kwmech** · 07-01-2025, 11:48 AM

You do not have to use all 6 bolts if they do not line up.

06-29-2025, 12:26 AM	#1
chappys4life Registered User Join Date: Oct 2008 Location: Austin, TX Posts: 160	Flexplate for th350 & 4l80e Replacing the motor in my 70 c1500. Built a 383 that is internally balanced. Looking for a Flexplate for a 2 piece seal motor that will work with the th350 that’s in it now but also would prefer it will work with a 4l80e I plan on installing down the road so I don’t have to buy a different Flexplate later. Any suggestions?

06-29-2025, 11:13 AM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,944	Re: Flexplate for th350 & 4l80e I've done a couple of 4l80 swaps and not had a problem using the 14'' flex plate that was on the engine.

07-01-2025, 11:48 AM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,944	Re: Flexplate for th350 & 4l80e You do not have to use all 6 bolts if they do not line up.



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