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340/904 flexplate #1463802 07/07/13 01:42 AM 07/07/13 01:42 AM
Joined: Sep 2004 Posts: 1,143 Rockford,IL 7 71Polara383 OP super stock
71Polara383 OP super stock 7 Joined: Sep 2004 Posts: 1,143 Rockford,IL	What flex plate is needed to use a 904 behind an external balance 340? Was gonna build a 360 but plans changed. The converter I bought is for external balance small blocks. Its a boss hog 2800 stall for a 904

Re: 340/904 flexplate [Re: 71Polara383] #1463803 07/07/13 01:46 AM 07/07/13 01:46 AM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: What flex plate is needed to use a 904 behind an external balance 340? Was gonna build a 360 but plans changed. The converter I bought is for external balance small blocks. Its a boss hog 2800 stall for a 904 the amount weight for externally balanced 340 and 360 are different... can not use a externally balanced converter for a 360 on a externally balanced 340....need to knock weights off converter and get B&M weighted flexplate for externally balanced 340. Last edited by 70AARcuda; 07/07/13 01:47 AM. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: 340/904 flexplate [Re: 70AARcuda] #1463804 07/07/13 01:49 AM 07/07/13 01:49 AM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	http://www.summitracing.com/parts/bmm-10235/overview/make/dodge only shows for 727.... what is the bolt circle of the torque converter... Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: 340/904 flexplate [Re: 70AARcuda] #1463805 07/07/13 02:17 AM 07/07/13 02:17 AM
Joined: Sep 2004 Posts: 1,143 Rockford,IL 7 71Polara383 OP super stock
71Polara383 OP super stock 7 Joined: Sep 2004 Posts: 1,143 Rockford,IL	10'' bolt pattern. I can just knock the weight off my converter?

Re: 340/904 flexplate [Re: 71Polara383] #1463806 07/07/13 04:39 AM 07/07/13 04:39 AM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	That is right - just knock the weight off if you have a internal balanced 340.

Re: 340/904 flexplate [Re: MoparforLife] #1463807 07/07/13 06:29 AM 07/07/13 06:29 AM
Joined: Sep 2004 Posts: 1,143 Rockford,IL 7 71Polara383 OP super stock
71Polara383 OP super stock 7 Joined: Sep 2004 Posts: 1,143 Rockford,IL	The motor I'm considering is a 72 cast crank 340 with external balance. My 360 is trashed picking up the 340 motor this week hopefully.

Re: 340/904 flexplate [Re: 71Polara383] #1463808 07/07/13 09:41 AM 07/07/13 09:41 AM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	In that case you will need the flexplate for a cast shaft 340 or a converter weighted for a cast shaft 340. BUT if you get the flexplate you will need to take the weights off the present converter as as you cannot use both a weighted converter and flexplated for a cast shaft. And the 360 weighting is different.

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