Flexplate Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1971Stepside** · 09-12-2018, 10:46 AM

I have an 03 LQ4 that came out of a Denali Yukon. I assume it had a 4L60 behind it. I am going with a 4L80e. I am changing out converters, so the new one should be a 3 bolt pattern converter from Circle-D. My flexplate only has 3 holes for the converter now. Do I need a different flexplate for the 4L80 or will the one I have work. The plate I have has #TU2824G stamped on it. Thanks

4x4k30 · 09-12-2018, 01:17 PM

you will need a 6.0 flex plate it has 6 bolt holes and the 4l80e converter uses 6

**1971Stepside** · 09-12-2018, 02:53 PM

The LQ4 is a 6.0. I understand the newer converters for the 80 have the three bolt set up. This is what I am trying to confirm.

**1971Stepside** · 09-13-2018, 10:38 AM

I called Brian Tooley this morning and they said the Circle-D converter just has 3 bolts instead of the six so I should be fine. He didn't give me a warm fuzzy, but I will order the converter and see what I get to work.

beaterku · 09-13-2018, 11:08 AM

Depends on which Circle D converter you are buying. The HP series 278mm only fits the dished 60e style flex plate. The pro converters fit the flat 80e flexplate.

**1971Stepside** · 09-13-2018, 11:33 AM

It is the 278mm series according to the quote they sent me. So, it should work?

beaterku · 09-13-2018, 11:35 AM

http://www.circledspecialties.com/4l80-hp-series-278mm

Towards the bottom of the page "ONLY fits the dished LS style flexplate"

Sounds like you are good to go.

**1971Stepside** · 09-13-2018, 11:55 AM

Here is what I have. Thanks for your help.

09-12-2018, 10:46 AM	#1
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Flexplate Question I have an 03 LQ4 that came out of a Denali Yukon. I assume it had a 4L60 behind it. I am going with a 4L80e. I am changing out converters, so the new one should be a 3 bolt pattern converter from Circle-D. My flexplate only has 3 holes for the converter now. Do I need a different flexplate for the 4L80 or will the one I have work. The plate I have has #TU2824G stamped on it. Thanks __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

09-12-2018, 01:17 PM	#2
4x4k30 Registered User Join Date: Jun 2003 Location: ga Posts: 630	Re: Flexplate Question you will need a 6.0 flex plate it has 6 bolt holes and the 4l80e converter uses 6 __________________ 4x4k30 if trouble was money i would have plenty Last edited by 4x4k30; 09-12-2018 at 01:24 PM.

09-12-2018, 02:53 PM	#3
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Re: Flexplate Question The LQ4 is a 6.0. I understand the newer converters for the 80 have the three bolt set up. This is what I am trying to confirm. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

09-13-2018, 10:38 AM	#4
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Re: Flexplate Question I called Brian Tooley this morning and they said the Circle-D converter just has 3 bolts instead of the six so I should be fine. He didn't give me a warm fuzzy, but I will order the converter and see what I get to work. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

09-13-2018, 11:08 AM	#5
beaterku Registered User Join Date: Mar 2013 Location: Lenexa, KS Posts: 547	Re: Flexplate Question Depends on which Circle D converter you are buying. The HP series 278mm only fits the dished 60e style flex plate. The pro converters fit the flat 80e flexplate. __________________ www.rustywrenches.com My 72 SWB build My YouTube channel

09-13-2018, 11:33 AM	#6
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Re: Flexplate Question It is the 278mm series according to the quote they sent me. So, it should work? __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

09-13-2018, 11:35 AM	#7
beaterku Registered User Join Date: Mar 2013 Location: Lenexa, KS Posts: 547	Re: Flexplate Question http://www.circledspecialties.com/4l80-hp-series-278mm Towards the bottom of the page "ONLY fits the dished LS style flexplate" Sounds like you are good to go. __________________ www.rustywrenches.com My 72 SWB build My YouTube channel

09-13-2018, 11:55 AM	#8
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Re: Flexplate Question Here is what I have. Thanks for your help. Attached Images __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."



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