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Thread: chevy 6.2L with 350 turbo

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  1. #1

    Default chevy 6.2L with 350 turbo

    ok so i have a chevy 6.2L from a hummer... and i was told that a 350 turbo trans would work well with it.... now my question is... what will i need in order to make this swap successful???
    Medic
    Special Troops, 40th ID

  2. #2

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    A deisel rated torque converter. I would use a 700r4 instead of the 350.
    "We are here for the meeting!"

  3. #3
    Join Date
    Jun 2007
    Location
    Alexandria KY
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    482

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    Will a TH350 handle the torque of a diesel? Every 6.2 or 6.5 I personally have seen, whether it was a 4x4 pickup, 2wd van, or box truck all used heavier versions of a TH400. I think they are known as TH475 trans. I was always told that they have larger shafts and some other upgrades (one that comes to mind is a deeper pan) to make them strong enough to live behind diesel torque in heavier trucks.

  4. #4

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    I dont think a 350 would do well for long.
    68 M-715 MVPA #2710

  5. #5

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    what about an nv4500??? and what transfercase would u guys suggest??? is NP205 the best way to go or is the something out there that would be a better choice?? im an offroader... and i plan to take this bad boy out to the tracks.... besides the under the hood stuff... what else should i consider replacing/rebuilding/upgrading???
    Medic
    Special Troops, 40th ID

  6. #6
    Join Date
    Dec 2006
    Location
    Southern Indiana
    Posts
    246

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    We used to drag 455 Olds motors with TH350's behind them and it's a sure bet those 455's were putting out more hp and torque than any 6.2 ever dreamed of. Now a TH400 is certainly a step up but it also is known as a power robbing sunuvagun(hence why we ran shift kitted 350's with a few extra discs tossed in for good measure).

  7. #7
    Join Date
    Jun 2007
    Location
    Alexandria KY
    Posts
    482

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    Most of the racers I know prefer powerglides. I agree with you that a built TH350 will do well in a race car, but the constant load and traction of all 4 tires in such a heavy truck is an entirely different type of torque load. If considering a manual trans the SM465 is hard to beat for price, strength and gearing.....no o/d though. I had a p/u with a 6.2 and the 465, 3.73 gears and 33" tires...it got 20+ mpg. It would NOT scare anyone with acceleration though. NV4500 would be great for the o/d, if rig will see lots of road time, but the extra initial cost should be factored in.
    The 715 I'm currently building is running a 454 with a TH400 mated to a NP203-205 doubler kit. Not my first choice, but readily available and cheap. Intially considered a 5.9 and NV4500, but the costs were going to be thousands of dollars higher. Just did not make sense for me, might be different for another truck owner though, based upon the intended use.

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