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Big Block adaption?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BigBurban350, Aug 12, 2002.

  1. BigBurban350

    BigBurban350 1/2 ton status

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    How would you get a 454 bolted onto a 700R4/350 trans?
     
  2. Blazer79

    Blazer79 1/2 ton status

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    Been there, done that.

    Nothing out of this world. Just replace the engine and reuse the 350 engine mounts. The trannies bellhousings will fit as long as they are from Chevy/GMC, not Pontiac.

    Then just swap a larger radiator, connect your exhaust and you're done.

    If you have more questions, you can PM me.
     
  3. Sandman

    Sandman 3/4 ton status Author

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    This is exactly why GM's rock. You can just more or less bolt in whatever you want.
     
  4. BigBurban350

    BigBurban350 1/2 ton status

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    SWEET /forums/images/icons/shocked.gif
     
  5. alec78

    alec78 1/2 ton status

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    Better be a beefed up 700/TH350! I don't think it would last too long behind a 454. Neither of them are really strong enough to take that kind of beating.
     
  6. Bross82

    Bross82 1/2 ton status

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    what tranny and transfer case do you recommend with a 454??

    matt
     
  7. Blazer79

    Blazer79 1/2 ton status

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    In MY order of preference:

    1) 4L80 (Needs computer)
    2) 4L60 (Needs computer)
    3) TH400
    4) TH350
    5) 700R4

    I'm currently running a TH350, but what can I do, I don't have any money for a tranny swap. It's been holding fine since March when I finished the swap.

    The thing is how powerful is your 454. Mine is practically stock, so there are 383s and 400s out there with more power than my 454. If you change ATF frequently and run a huge tranny cooler, you might be fine with any tranny.

    Of course there are also manual trannies, which are a completely different story.
     
  8. Brady

    Brady 1/2 ton status

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    Don't forget you will need to use the flywheel for the 454.The 454 is externaly balanced,the sbs are interaly balanced (except 400).Also need all accesories for 454.
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Just a minor point of contention a...4L60*E* and 4L80 *E* require computers to run.

    Of course, the 4L80E was never just a 4L80, so that makes it easy to distinguish.

    700=4L60 4L60+electronics=4L60E
     
  10. alec78

    alec78 1/2 ton status

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    Even though a stock older 454 may not make enough power right now to warrent it, the ability to increase the output is so easy I would use nothing less then a TH400 tranny.

    I can't suggest a t-case since I don't know much about them, yet. /forums/images/icons/blush.gif
     
  11. BLUESMAN

    BLUESMAN 1/2 ton status

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    NOTE....GM never offered a 454 combo'd with an TH700 trans(nor a TH350 I believe),for a good reason.The amount of torque a 454 puts out would blow a TH700 apart.Maybe not right away but unless it's a heavily modified trans....SEE CASH!Go with a bulletproof TH400 and you won't be looking over your shoulder everytime you shift.Or spend alot of cash and get your TH700.Mike
     
  12. BLUESMAN

    BLUESMAN 1/2 ton status

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    For an T-case, I'd go gear driven 205.....maybe a NP241.
     
  13. LA Bogger

    LA Bogger 1/2 ton status

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    Just remember than ORD Green Blazer with 42s (2nd in in the Challenge) and a Big Block runs a 700R prep I believe by Art Carr..


    Eat More Mud!!!

    AIRBORNE!!!
     
  14. BLUESMAN

    BLUESMAN 1/2 ton status

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    AND how much did he pay for that modified trans??Close to a grand if not more.Sorry that 3.06 1st gear and overdrive is not worth it to me.TH400 trans and 205/203 doubler would be same price.Mike
     
  15. shane74

    shane74 1/2 ton status

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    I ran a TH350 behind my 454 in my chevelle for 3 years with no problems. I spent some minor $$ to beef it up some, but it has lasted more than 5 years now in the chevelle. I sold the car 2 years ago to a buddy, but since I built it, it has run consistent high 10's in the 1/4 mile. If you build it right, you'll never blow it up. A very common misconception is the the TH350 is too weak for a big block.

    I will be bolting another one into my blazer next month. I don't expect to have any problems. I have seen 383's blow up TH400's like they were made of tissue paper. It's all in how you build it and how you drive it. Oh, yeah, my blazer runs 38's and I will be bolting the 454 up to the TH350/NP205...on a 1/2 ton D44 and 12 bolt. like I said, build it right and it'll never break.
     

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