Transmission attachment?

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  1. 493 Mike

    493 Mike FBBO Gold Member FBBO Gold Member

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    Hi fellas,
    I was wondering what everyone uses to bolt their automatics to the engine? I have never used anything but OEM fasteners. Is there a need for stronger hardware?
    Mike
     
  2. 69L48Z27

    69L48Z27 Well-Known Member

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    Never needed anything other than OE. ARP or specialty stainless would be my go to for a show pony, full custom restomod type car.
    I don’t think anything more is needed for strength unless your building a race car.
     
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    • 91r/t

      91r/t FBBO Gold Member FBBO Gold Member

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      Yea mainly the hardware holds it tight to the face of the rear engine block. I'd think if anything, the alignment pins would be the more stressed area for twist then the actual hardware holding it tight against the block. :) The area that always scared me was that stock flex plate. Big horsepower going through a half assed tin plate with 4 bolts holding all that power.......crazy in my mind to think that!
       
    • 493 Mike

      493 Mike FBBO Gold Member FBBO Gold Member

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      Well, that's kind of why I posted in this forum.
      Mike
       
    • 451Mopar

      451Mopar Well-Known Member

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      Normally the stock trans bolts unless using a trans shield, then you need the longer bolts.
       
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      • dvw

        dvw Well-Known Member

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        I've ripped flex plates and torn the boss off the converter. Never hurt a bolt. Motor makes north of 900hp
        Doug
         
      • 70chall440

        70chall440 FBBO Gold Member FBBO Gold Member

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        OE is fine, used a lot of grade 5 normal bolts with lock washers on many cars, used grade 8 with lock washers on others and have used ARP on a few. They are just bolts, no magic in them, just make sure they are long enough to engage the block and they are tight...
         
      • 69L48Z27

        69L48Z27 Well-Known Member

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        Sorry. Didn’t take note of the forum.
         
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