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deisel tranny to gas

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Truckdweld, Mar 6, 2001.

  1. Truckdweld

    Truckdweld Registered Member

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    Can i mount the tranny that i have behind my 82 6.2 liter deisel to a 350. The transmision is a 700r4. Thanks
     
  2. lv2whl

    lv2whl 1/2 ton status

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    Hell no you can't. whats wrong with you. Are you stupid???
     
  3. lv2whl

    lv2whl 1/2 ton status

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    just messin' with ya. you know i have no idea.
     
  4. Triaged

    Triaged 1/2 ton status

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    I think that there are only 2 bolt paterns. One for the 60deg V6 (2.8 & 3.2) and the other for the 90deg V6 (4.3) and V8's

    '71 Blazer CST with alot of rust
     
  5. DSLBLAZER

    DSLBLAZER Registered Member

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    Yes it will bolt right up. I think you will need a different torque converter, but I don't know why? I think somebody told me there was a difference?

    Keven
     
  6. lv2whl

    lv2whl 1/2 ton status

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    isn't there a different shift pattern though?
     
  7. HarryH3

    HarryH3 1 ton status Author

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    The bolt pattern on the bellhousing is the same for all the V8's, gas or diesel. (Not sure about the new Duramax 6600 Diesel. Haven't heard much about those yet).

    The powerband for a diesel is quite different than for a gas engine. My 700R4 behind a gas engine upshifts at around 5200 RPM at WOT. A 6.2 wants to shift closer to 3000 RPM. Changing the governor springs and weights adjusts this shift point. The governor can be accessed without opening up the tranny.

    The torque comes on much earlier in the diesel as well, so a torque converter with a much lower stall speed can be used. A gas engine typically doesn't make much torque below 1500 RPM, so a torque converter that stalls at a higher speed is used in those applications.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  8. pcorssmit

    pcorssmit 1/2 ton status

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    What Harry said.

    All Chevy V8s and 90 deg. V6s used one bolt pattern. Buick, Olds, Pontiac, and Caddy used the BOP pattern. The 350 diesel also used this pattern, as it was based on an Olds gas block. The 6.2 uses the Chevy pattern. Some TH350s were available with a dual bolt pattern. All 700s used the Chevy pattern.

    Learn from my mistake, get a new torque converter. Otherwise power and acceleration will suffer. Also change the goveror. If you want to up the shift points, use a govenor form a police car, they shifted a tad higher than the trucks. An IROC or Vette goveror can also be used, however it may not shift at WOT as the truck motors don't rev as high. The govenors are available at the dealer for around $20-$30.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  9. HarryH3

    HarryH3 1 ton status Author

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    Also, if you want to come out of the hole like a rocket, the torque converter from the 'vette has a higher stall speed. It puts the engine into the power band quickly. But it will also generate a LOT of heat if you like to go rock crawling, as it will slip a lot more than a truck converter at low RPM.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  10. grumpy

    grumpy 1/2 ton status

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    OK, I'm confused. Does the 6.2 diesel have a BOP or a chevy bolt pattern? I have a TH400 from a 6.2 and want to mate it with a 500 caddy motor. What do I need to do?
    Thanks,
    grumpy
     
  11. HarryH3

    HarryH3 1 ton status Author

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    The 6.2 has the Chevy bolt pattern. You'll need an adapter to mate your Turbo 400 to a Caddy motor. Check out <A target="_blank" HREF=http://www.advanceadapters.com>http://www.advanceadapters.com</A>, they may have the adapter you need. If not, they should be able to point you in the right direction.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  12. AgDieseler

    AgDieseler Certified Scrap Producer Premium Member GMOTM Winner

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    The Allison 5 speed was tested on souped up 6.5TDs run in 81-87 body style pickups. That says that the Allison has the proper bellhousing to mate to the 6.5. If the Allison mates to the Dmax, then the Dmax can mate to any other GM tranny, because the bolt patterns between the 6.5 and Dmax are the same. Sounds like somebody at GM was thinking ahead.

    David
    '85 diesel burban
     

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