Torque converter bolt patterns - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Matt Cramer · 10-10-2013, 08:49 PM

So, I'm putting a TH350 behind an 4.8 LSx, using the TH350's torque converter. I've heard some flexplates have to be enlarged slightly, like in this picture:

Mine doesn't need to be enlarged slightly, though - it needs a LOT more! Did I get some other size torque converter, like maybe a 10.75" bolt pattern? If so, is there an off the shelf flexplate for it? This may be a bit too much Demelling for my taste.

Matt Cramer · 10-11-2013, 08:29 AM

Follow up - double checked measurements, torque converter is definitely the 10.75" bolt pattern. Does this build need a different flexplate, or a different torque converter?

Matt Cramer · 10-11-2013, 09:32 AM

Should have checked the Summit catalog before posting; I'd have answered my own question.

http://www.summitracing.com/parts/ad...make/chevrolet

10-10-2013, 08:49 PM	#1
Matt Cramer Registered User Join Date: Apr 2012 Location: Covington, GA Posts: 386	Torque converter bolt patterns So, I'm putting a TH350 behind an 4.8 LSx, using the TH350's torque converter. I've heard some flexplates have to be enlarged slightly, like in this picture: Mine doesn't need to be enlarged slightly, though - it needs a LOT more! Did I get some other size torque converter, like maybe a 10.75" bolt pattern? If so, is there an off the shelf flexplate for it? This may be a bit too much Demelling for my taste. __________________ Matt Cramer 1972 Chevy C10 - 4.8 swap, long bed, and maybe one dent free body panel somewhere - SOLD 4.8 LS build thread

10-11-2013, 08:29 AM	#2
Matt Cramer Registered User Join Date: Apr 2012 Location: Covington, GA Posts: 386	Re: Torque converter bolt patterns Follow up - double checked measurements, torque converter is definitely the 10.75" bolt pattern. Does this build need a different flexplate, or a different torque converter? __________________ Matt Cramer 1972 Chevy C10 - 4.8 swap, long bed, and maybe one dent free body panel somewhere - SOLD 4.8 LS build thread

10-11-2013, 09:32 AM	#3
Matt Cramer Registered User Join Date: Apr 2012 Location: Covington, GA Posts: 386	Re: Torque converter bolt patterns Should have checked the Summit catalog before posting; I'd have answered my own question. http://www.summitracing.com/parts/ad...make/chevrolet __________________ Matt Cramer 1972 Chevy C10 - 4.8 swap, long bed, and maybe one dent free body panel somewhere - SOLD 4.8 LS build thread

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