torque converter/flexplate help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigblock73 · 05-12-2003, 07:07 PM

I went to bolt in my torque converter tonight and came across a problem.

My converter bolt holes do not match my flexplate holes...it appears as if my torque converter is "smaller" than the flexplate...I am about 1/2" away all the way around.

Are all chevy torque converter bolt patters the same size? Do all Chevy auto trans flexplates share the same bolt pattern?

The trans is a 700r4 and the engine is a 454.

Any help would be appreciated...thanks!

-Jeff

menlatin · 05-12-2003, 08:11 PM

doesn't the fly wheel have 6 holes? on mine, there are 3 holes that dont reach, and 3 that do. try rotating the flywheel and see if the other holes match up.

73stepside · 05-12-2003, 08:16 PM

the stock flexpalte will not have the bolt holes for a small converter. you will have to an aftermarket flexplate. make sure you get the right one. one piece seals have weights on the flexplate

bigblock73 · 05-12-2003, 08:46 PM

I know for a fact I only have 3 bolt holes on the flexplate.

I just looked in Summit and there are "dual bolt pattern" flexplates...this must be what i need.

As far as the weights go...it appears that the flexplate in there has them...does this mean the engine is externally balanced? I don't see any mention in Summit on "1-piece seals" for their flexplates.

Am I heading in the right direction guys?

Thanks - Jeff

*rage'nrat638* · 05-12-2003, 09:59 PM

yes order a tci flex plate 168 tooth sfi external balance

**swervin ervin** · 05-12-2003, 10:14 PM

Jeff,

yes, 454's are externally balanced.

bigblock73 · 05-12-2003, 10:29 PM

Thanks guys!

Wish I would have noticed this BEFORE I bolted the trans/engine together and placed it in the frame...oh well. At least the body is still off I guess.

-Jeff

*rage'nrat638* · 05-13-2003, 07:32 AM

just a note....most after market converters,have 7/16 bolts you may have to drill out the holes to 7/16 on the flex plate if you have one?????

05-12-2003, 07:07 PM	#1
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,826	torque converter/flexplate help I went to bolt in my torque converter tonight and came across a problem. My converter bolt holes do not match my flexplate holes...it appears as if my torque converter is "smaller" than the flexplate...I am about 1/2" away all the way around. Are all chevy torque converter bolt patters the same size? Do all Chevy auto trans flexplates share the same bolt pattern? The trans is a 700r4 and the engine is a 454. Any help would be appreciated...thanks! -Jeff

05-12-2003, 08:11 PM	#2
menlatin Registered User Join Date: Feb 2003 Location: Denton, TX Posts: 281	doesn't the fly wheel have 6 holes? on mine, there are 3 holes that dont reach, and 3 that do. try rotating the flywheel and see if the other holes match up. __________________ 72 lwb. living room built 355. Best 1/8mi, 8.85 @ 79. WOOHOO, i didnt break anything!!

05-12-2003, 08:16 PM	#3
73stepside Registered User Join Date: Feb 2002 Location: Moore OK 73160 Posts: 974	the stock flexpalte will not have the bolt holes for a small converter. you will have to an aftermarket flexplate. make sure you get the right one. one piece seals have weights on the flexplate __________________ 04 GMC Sierra RCSS 70 CST LWB 04 HD Sportster 1200 Custom

05-12-2003, 10:14 PM	#6
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Jeff, yes, 454's are externally balanced. __________________ Mike 1985 Chevy C-10

05-12-2003, 08:46 PM	#4
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,826	I know for a fact I only have 3 bolt holes on the flexplate. I just looked in Summit and there are "dual bolt pattern" flexplates...this must be what i need. As far as the weights go...it appears that the flexplate in there has them...does this mean the engine is externally balanced? I don't see any mention in Summit on "1-piece seals" for their flexplates. Am I heading in the right direction guys? Thanks - Jeff

05-12-2003, 09:59 PM	#5
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	yes order a tci flex plate 168 tooth sfi external balance

05-12-2003, 10:29 PM	#7
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,826	Thanks guys! Wish I would have noticed this BEFORE I bolted the trans/engine together and placed it in the frame...oh well. At least the body is still off I guess. -Jeff

05-13-2003, 07:32 AM	#8
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	just a note....most after market converters,have 7/16 bolts you may have to drill out the holes to 7/16 on the flex plate if you have one?????



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