What To Do With a Tweaked Flex Plate?

Transmission and Drivetrain Tech

  1. dibbons

    dibbons Well-Known Member

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    Leave it alone, hammer on it, replace it? Looks to be a little out of whack. I always thought those things were "self-repairing", meaning with just a little abuse they just spring back to normal on their own. I guess not. Thank you.

    flex plate bent.JPG
     
  2. CudaFactHackJob

    CudaFactHackJob Well-Known Member

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    I'd pry on it a little; see what it does.
     
  3. Yunick13

    Yunick13 Well-Known Member

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    Save yourself the headache and replace it
     
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    • dartfreak75

      dartfreak75 Restore it, Dont part it! FABO Gold Member

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      I have one like that. I wondered the same thing. I'm just guessing it seems to me it would flatten itself out when you bolt it to the converter (a flat surface) but I was worried about it so I just replaced it.
       
    • Treblig

      Treblig Well-Known Member

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      When you suck it up the converter it should straighten out??/
       
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      • mopar head

        mopar head Well-Known Member

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        Would make a killer frisbee:)
         
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        • gzig5

          gzig5 FABO Gold Member FABO Gold Member

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          If it is bent the wrong way, it could put a load on the end of the crank, which will result in excessive end play on the thrust bearing. My 340 was like this when I pulled it down. The converter was bottoming out on the crank and I found .012" clearance on the thrust bearing, which should be about .007" max. Just get a new one, they are cheap.
           
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          • CudaFactHackJob

            CudaFactHackJob Well-Known Member

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            It will straighten out, but it would cause the converter to be pulled forward; slightly out of the trans, and converter bolts might contact the dust plate. You have to turn the crank and measure the distance from the four areas to the block.
             
          • Oldmanmopar

            Oldmanmopar Going left turning right FABO Gold Member

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            That is a very bad question and anyone suggest to straighten it shouldn't be working on mopars. Its Garbage. They are on every motor with 10 inch converter cars 904 and 727 are all the same. /six to 440 with 6 bolt crank. If you weren't so far away I would sling one your way. I am sure someone near you has one for free. All mopar guys should have a stack. My wife wants me to weld two on a stake so she can paint them for flowers. she already gathered up some 7 blade fans. . Women see car parts differently.
             
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            • CudaFactHackJob

              CudaFactHackJob Well-Known Member

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              I've straightened worse ones than that and had them last...but I probably shouldn't even be working on any type of machinery..It's just mild steel. I think the more worn your thrust bearing is, then the more the plate will shake forward and back. That's what cracks them. That's an extremely mild bend.
               
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              • toolmanmike

                toolmanmike Moderator Staff Member FABO Gold Member

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                Bolt on a new one. (or a straight used one.)
                 
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                • dibbons

                  dibbons Well-Known Member

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                  Found one on Amazon for $22.50 USD (FRA303-10 inch bolt circle) including shipping to Mexico, so that will be the way to go. Thank you. P.S. Summit and everyone else wanted $50.00 to ship here via UPS. Obviously, Amazon has some kind of scam/monopoly on shipping.
                   
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                  • CudaFactHackJob

                    CudaFactHackJob Well-Known Member

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                    I sure do hope it doesn't get bent in shipping...lol..
                     
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                    • Dana67Dart

                      Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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                      Seems to me that once the metal has some how gotten moved past it's elastic limit it will never be the same.

                      I'm glad you are replacing it
                       
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                      • toolmanmike

                        toolmanmike Moderator Staff Member FABO Gold Member

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                        And the converter floats in the pump housing and front bushing. I wouldn't want a side load or a wobble caused by a bent flex plate.
                         
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                        • moparmat2000

                          moparmat2000 FABO Gold Member FABO Gold Member

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                          Brand new ATP one from rock auto is $9. Not worth fooling with, just replace it.
                           
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                          • toolmanmike

                            toolmanmike Moderator Staff Member FABO Gold Member

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                            Yep, It's like why are we even talking about this? :BangHead::BangHead::BangHead:
                             
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                            • moparmat2000

                              moparmat2000 FABO Gold Member FABO Gold Member

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                              That's scrap trailer shit lol.
                               
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                              • moparmat2000

                                moparmat2000 FABO Gold Member FABO Gold Member

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                                1965 barracuda 273 A904 combo ATP Z196, $9.56 Same flex plate up thru I think 1989 - 1991

                                Screenshot_20200830-174126_Samsung Internet.jpg
                                 
                              • CudaFactHackJob

                                CudaFactHackJob Well-Known Member

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                                OMG that little bend is NOTHING! Hahaha, you guys are PARANOID! They hardly ever even crack in that area. I always straighten them; then turn the motor and measure the distance between each of the four areas against the back of the block. Nothing to it. But then again, I always check runout on every new one I install as well. Most aren't straight. You guys ALWAYS check the new ones...riiight?? Sometimes it's not about price, it's about TIME.
                                 
                              • krazykuda

                                krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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                                Why bother, you can get a new flex plate for $17 from Mancini...

                                Mancini Racing
                                 
                              • Dana67Dart

                                Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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                                No... flex plates never crack...
                                Pictures why I preach to slow down
                                cracked flex plate - Google Search


                                BTW OP is in Mexico so shipping makes that 15.00 flexplate 50 to 75 dollars.

                                Out of curiosity couldn't you buy one from a local auto parts store in Mexico? I know it is not near you but there is a NAPA in Juarez, could they ship it to you from there cheaper?

                                But IMHO money well spent.
                                 
                                Last edited: Aug 30, 2020
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                                • CudaFactHackJob

                                  CudaFactHackJob Well-Known Member

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                                  Yep, right near the bolts, that's where I see them usually crack as well. This bend is not in that area. This bend if far from the metal's point of elasticity. Never run a bent flex plate; they ALL have to be checked for trueness...kinda like some of the posts on here...lol..
                                   
                                • pishta

                                  pishta I know I'm right....

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                                  On a early A trans and a >67 motor, they crack at the ears because the OP didnt know the early small snout convertors were not compatible with the later larger bore crankshafts and they never center. AMHIK.....finally figured it out. Gave me a reason to put that new 8.75 as long as I was going to have to ditch the small bore 65 cable trans and its B&T flanged drive shaft. A 1/8 wall bushing would have been a little cheaper.
                                   
                                • CudaFactHackJob

                                  CudaFactHackJob Well-Known Member

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                                  "When there isn't enough time to do it RIGHT; there's ALWAYS enough time to do it TWICE"...
                                   
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