flex plate

JerryL · Post by **JerryL** » Mon May 04, 15 8:03 am

I queried this because of the advice I got here:

http://www.moparuk.com/forums/viewtopic ... highlight=

on page 2 and the flex plate given to me by Terryr which is the star shaped one.

I misinterpreted your advice Cannonball, you said:

"i have never seen a 383 with a cast crank, i would think its a steel crank so yes get rid of that flex plate you need one that looks the same but no cut out as yours has,, but double check and as has been mentioned check your crank damper the regular steel crank damper is only circa 1" thick the cast crank type are much thicker,"

So now I realise the forged crank could have a complete circular plate with no cutout.

DaveBishop · Post by **DaveBishop** » Mon May 04, 15 9:48 am

Please listen to cannonball. That's is a after market flex plate so that you can fit any converter. At the factory they put balance weights on the converter so that they didn't have to have different flex plates

Post by **MattH** » Sun May 10, 15 12:22 pm

just to add to this, are we saying all flex plates are the same for 727 boxes?

Reason I ask, I got a flex plate to replace my cracked one, and its 1" too large hole to hole diameter.

I am running a 904 transmission, so need a 10" hole spacing.

the 11" I got as a replacement has the same deal as far as the crank bolt pattern goes, and the lack of any balance weights.

Just want to clarify where the differences fit i.e. when is it a 10" and when is it 11"?

Never having worked on a 727 I don't know about them.

Scooby · Post by **Scooby** » Sun May 10, 15 5:56 pm

[quote="MattH"]just to add to this, are we saying all flex plates are the same for 727 boxes?

Reason I ask, I got a flex plate to replace my cracked one, and its 1" too large hole to hole diameter.

I am running a 904 transmission, so need a 10" hole spacing.

the 11" I got as a replacement has the same deal as far as the crank bolt pattern goes, and the lack of any balance weights.

Just want to clarify where the differences fit i.e. when is it a 10" and when is it 11"?

I always thought 11 Inch was 727 ( SB) that's what came out of mine when I changed things around. And 10 inch 904

Cannonball · Post by **Cannonball** » Sun May 10, 15 6:30 pm

nope they had both sizes pretty sure 9o4 did as well,,

Scooby · Post by **Scooby** » Sun May 10, 15 7:33 pm

Cannonball wrote:nope they had both sizes pretty sure 9o4 did as well,,

I stand corrected...Thanks Dunc

Cannonball · Post by **Cannonball** » Sun May 10, 15 11:47 pm

Scooby wrote:
Cannonball wrote:nope they had both sizes pretty sure 9o4 did as well,,
I stand corrected...Thanks Dunc

no probs matey,,,,

Blue · Post by **Blue** » Mon May 11, 15 9:06 am

All stock flex plates are interchangeable, 6 pot, small block, big block, 904, 727. There are definately 2, possibly 3 different convertor bolt patterns across the range of vehicles, so you just need to find the right one for your convertor.

Cannonball · Post by **Cannonball** » Mon May 11, 15 12:03 pm

Blue wrote:All stock flex plates are interchangeable, 6 pot, small block, big block, 904, 727. There are definately 2, possibly 3 different convertor bolt patterns across the range of vehicles, so you just need to find the right one for your convertor.

crikey i get to correct, the bluester,,,,,,,,,,,

sixpots are different.

MilesnMiles · Post by **MilesnMiles** » Mon May 11, 15 12:30 pm

Some of the aftermarket ones have both hole patterns.

Post by **MattH** » Mon May 11, 15 12:53 pm

Hopefully sorted now, Hauser Racing had this on the shelf.

Pete · Post by **Pete** » Mon May 11, 15 12:55 pm

Like the one in my garage or is the crank bolt arrangement different?

Post by **MattH** » Mon May 11, 15 1:08 pm

Geoff said this fits most of them. Bolt pattern the same as the one I got from Roydon, so I think they are all the same.

I thought the one in your garage was bolted to the converter for the Duster.

Blue · Post by **Blue** » Mon May 11, 15 3:57 pm

Cannonball wrote:
Blue wrote:All stock flex plates are interchangeable, 6 pot, small block, big block, 904, 727. There are definately 2, possibly 3 different convertor bolt patterns across the range of vehicles, so you just need to find the right one for your convertor.
crikey i get to correct, the bluester,,,,,,,,,,, sixpots are different.

I must be getting old! yes the 6 pot one has a slightly different bolt pattern on the crank...

Mick · Post by **Mick** » Mon May 11, 15 7:29 pm

Not trying to teach you how to suck eggs Matt but if your motor is externally balanced, you'll need a weighted flex plate.
Mick