81 diesel to gas

Discussion in 'GM Powertrain' started by DemoMatt3, Sep 28, 2009.

  1. DemoMatt3

    DemoMatt3 Member

    I'm looking at an 81 pickup with a diesel in it with a bad injector pump, and would rather it be gas, I think the diesel was an old motor? how hard is it to convert this over to gas?
  2. Crawdaddy

    Crawdaddy All hail the Mad King!! Staff Member 5+ Years 1000 Posts Platinum Contributor

    Converting a diesel truck to gas will require a lot of replacing. Not only do you have to swap the motor out, but you also have to swap the transmission out for one built for gas and gas tank/fuel pump. The transmission particularly needs to be reworked or replaced because a diesel runs at much slower RPMs than a gas motor does.
  3. Mean_Green_95

    Mean_Green_95 Epic Member 5+ Years 1000 Posts

    If you buy it, you would be better off replacing the pump and maybe freshening up the motor...
  4. s5belford

    s5belford Epic Member 5+ Years 1000 Posts

    I'm not sure the swap would be worth your trouble...
  5. tbplus10

    tbplus10 Epic Member Staff Member 5+ Years 5000 Posts Platinum Contributor

    Unless your getting an extremely great deal on a very well conditioned truck i dont think the drive train swap would be worth the money.
    Look for something with a gas engine if thats what you want theres to many parts needed to make this swap it'll cost a lot.
  6. 2COR517

    2COR517 Epic Member 5+ Years 1000 Posts

    If it's a really nice truck and you would like to drive it for a while, this is what I would do. I would put in a TBI 350. Get a donor truck for the wiring and stuff like that. Easier than you think. A 87-91 Sub, Blazer, Yukon/Jimmy - would be the ideal donor truck. Same body style, all the wiring & electronics are there. No computer controlled transmission, so you can do whatever you like. TH350 TH400, 700R4.
  7. k.daddy1

    k.daddy1 Rockstar 100 Posts

    I've got two of the old diesel trucks that we use around the farm. The diesel engines crapped out, so they have been swapped with oldsmobile 350 engines. They mount right up to the tranny's without any trouble. The swap is fairly painless.

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