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th400 torque converter in front my th350?.

Discussion in 'The Garage' started by Silver84k5, Jun 6, 2003.

  1. Silver84k5

    Silver84k5 1/2 ton status

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    the guy who is building my tranny was telling me, If i have the "Big" flex plate i should be running the th400 torque converter instead of the th350,
    #1 it holds more fluid
    #2 it is stronger /forums/images/graemlins/confused.gif

    Oh yea and he said "If the bolts that hold the starter on are staggerd from left to right, i.e. not in a straight line from left to right then that means i have the big flex plate"

    all the chevys that i have gotten under have the bolts on the starter staggered like he was saying

    Can anyone give me some info on this? thx.
     
  2. Triaged

    Triaged 1/2 ton status

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    I don't think trucks ever came with the small flexplates.
    A larger torque converter will most likely have a lower stall.

    I had the small one and will put in the large (13"?) when I put the tranny back in this weekend.
     
  3. the cork

    the cork 1/2 ton status

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    the only time ive seen starter bolts in a straight line
    was on a 250 straight six, all big and small block chevys
    ive seen have the staggered starter bolts like your describing,
     
  4. gravdigr

    gravdigr 1/2 ton status

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    [ QUOTE ]
    the only time ive seen starter bolts in a straight line
    was on a 250 straight six, all big and small block chevys
    ive seen have the staggered starter bolts like your describing,

    [/ QUOTE ]

    That's interesting because the starter on my 350sb came off the inline 6 I had in my chevelle, non staggerd pattern...bolted right up. And in the catalogs I've seen the th350 and 400 use the same TC. I cannot see where a larger TC that changes stall speed would use a different flexplate, the bolt patterns are the same. Matter of fact the 350sb that I replaced the I6 in my chevelle with was bolted to a powerglide tranny...that same motor is now bolted in my 79 blazer connected to a TH350 using the same flexplate that connected to the powerglide. I think your mechanic is blowing smoke.
     
  5. Triaged

    Triaged 1/2 ton status

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    Most flexplates come with both the large and small bolt patterns in them already.
     
  6. the cork

    the cork 1/2 ton status

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    im not sure about the tc, but i would definately change the
    flexplate between a 350 and 400 because they are balanced
    differently, and that starter thing is strange, because ive
    used the same starter cone from 305s to 350s to 396s to 402s to 454s, all staggered mounting bolts, /forums/images/graemlins/thinking.gif
     
  7. slimlynn1

    slimlynn1 1/2 ton status

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    [ QUOTE ]
    im not sure about the tc, but i would definately change the
    flexplate between a 350 and 400 because they are balanced
    differently,

    [/ QUOTE ]
    Thats only for 350 and 400 engines not trannys.
     
  8. the cork

    the cork 1/2 ton status

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    i was just reading my chevy book and it sounds like you can
    put either one in, as most blocks are drilled for both
    starter styles, strange that none of the parts stores ever
    ask wich one you want,they always give the same one, but
    the offset style looks like it would clamp more solidly
    to the block, /forums/images/graemlins/thinking.gif
     
  9. boggerless

    boggerless 1 ton status Premium Member

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    you want to sell that power-glide? /forums/images/graemlins/confused.gif
     
  10. gravdigr

    gravdigr 1/2 ton status

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    [ QUOTE ]
    you want to sell that power-glide? /forums/images/graemlins/confused.gif

    [/ QUOTE ]

    The tranny went with the chassie when I sold the chevelle. Actually the belle had a chunk out of it where one of the mounting holes was. It didn't seem to hurt it much as I drove it for 3 years that way and it still lit up the tires with no problem /forums/images/graemlins/thumb.gif
     
  11. 4x4Freak

    4x4Freak 1/2 ton status

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    The 283 in my dad's jeep has the straight bolt pattern starter. It came out of a 63 Impala. I've also noticed that most aftermarket starters use the same pattern.
     

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