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86 k10 engine swap

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  • 86 k10 engine swap

    I have an 86 k104x4 was wondering how big of a project to go from a small block to a big block ? It has a 700r4 trans in it i'm pretty sure that will bolt up not sure on the motor mounts. Also has anyone heard of the left rear upper shock mount ripping the frame where it monts to?

  • #2
    Re: 86 k10 engine swap

    Unbolt small block, bolt in big block. Only real issue is p/s pump, they won't interchange.
    Last edited by b454rat; 10-07-2011, 07:33 PM.
    1999 GMC CCSB eventually get stuff done

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    • #3
      Re: 86 k10 engine swap

      Thanks thats great news. are you talking about the bracket that holds p/s pump?

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      • #4
        Re: 86 k10 engine swap

        very easy like b454rat said, but good luck getting the trans and axles to hold up over time.
        '84 k20 Silverado- 12" Superlifts, 38.5 XML's, 454/th400/np208/14b-FF/10b~SOLD
        '83 k30 Silverado- 4" susp, 35" Boggers, 454/sm465/np205/14b-FF/d60~Weekend truck
        '99 Ram 2500 4x4- CTD/NV4500/NP241HD/D70/D60/150PGH FASS/150hp DDP's/4in straight pipe to 6in single~DD

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        • #5
          Re: 86 k10 engine swap

          Already found a 14bolt ff and a d60 with 4:56 gears. Gonna try and fit a 38x12.50x15 under it with a 6 in lift. We'l go with that till the tranny goes but it does have a fresh rebuild on it.

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          • #6
            Re: 86 k10 engine swap

            sounds like your set! but i would keep an eye out for cheap sm465 or th400 because you will most likely need it down the road.
            '84 k20 Silverado- 12" Superlifts, 38.5 XML's, 454/th400/np208/14b-FF/10b~SOLD
            '83 k30 Silverado- 4" susp, 35" Boggers, 454/sm465/np205/14b-FF/d60~Weekend truck
            '99 Ram 2500 4x4- CTD/NV4500/NP241HD/D70/D60/150PGH FASS/150hp DDP's/4in straight pipe to 6in single~DD

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            • #7
              Re: 86 k10 engine swap

              i would say if you built the 700r4 good enough it would survive pretty well..

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              • #8
                Re: 86 k10 engine swap

                Well i am pretty sure i just traded my built jeep for a 1980 one ton flat bed 4x4 with a 454 in it plus some cash. How would the dually rear wheel convert to a single rear wheel? I hope everything will go good on all the swaping over might put the motor on a stand until huntin season is over and build it pretty stout.

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                • #9
                  Re: 86 k10 engine swap

                  Originally posted by magnum12 View Post
                  Well i am pretty sure i just traded my built jeep for a 1980 one ton flat bed 4x4 with a 454 in it plus some cash. How would the dually rear wheel convert to a single rear wheel? I hope everything will go good on all the swaping over might put the motor on a stand until huntin season is over and build it pretty stout.
                  the axle widths are different are different on srw and drw 14 bolts....find a srw one and save the headache

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                  • #10
                    Re: 86 k10 engine swap

                    You can convert the dually to single, but need the single parts to do it. Be easier to just get the singe rear axle.
                    1999 GMC CCSB eventually get stuff done

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                    • #11
                      Re: 86 k10 engine swap

                      Originally posted by trickedout420 View Post
                      the axle widths are different are different on srw and drw 14 bolts....find a srw one and save the headache
                      Yea I found out that drw 14 bolt is narrower than the srw. But i was told that you could just use a wheel spacer on the rear to make them match up. I am with yal mite just try to do some trading for a srw. Think i am going to wait till after deer season to do it so i should have plenty of time to see what i need. Not even for sure this guy is gonna trade we talked last night and was a 1000 dollars off he is going to call back today. If he does i will post back , then i will really be asking some questions.

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                      • #12
                        Re: 86 k10 engine swap

                        I'm just concerned about the transmission

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                        • #13
                          Re: 86 k10 engine swap

                          well, the stock 700R4 isn't gonna hold up to even a mild 454 long if you're hard on it. but...if you have that 700R4 built to the hilt it will easily hold what that 454 can dish out. if you don't care about OD though i'd swap in a SM465 or Th400...they'll hold the power of a stock/mild 454 stock with no modifications. sounds like you are gonna have one bad@$$ 86...post some pics for us to look at!

                          2004 GMC Sierra SLE Z71 rcsb, 5.3/4L60E/3.73/G80 time bomb...3" lift, tinted 03+ Silverado tails, plasti-dipped 16" wheels (unknown brand), 285/75/16 Thunderer M/T Extremes, Thrush Welded muffler...

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                          • #14
                            Re: 86 k10 engine swap

                            I will try and get some good pics up soon. Well yal was right about the 700r4 . On the way home from beer camp 4th gear started slipping pretty bad . When I got home i checked the fluid and it was a pint and half low so i went to town and got some lucas auto trans fluid. Went for a test drive about a 12 mile loop and it only did it once and it was not as bad at all . Crossing my fingers that was all that was wrong with it. But when the big boy engine goes in it looks like it is coming out I just hope that it holds till deer season is over cuz i think i just sold my jeep today but who knows talk is talk cash is great.

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                            • #15
                              Re: 86 k10 engine swap

                              damn dude, i'm sorry to hear that. you didn't even have the 454 in it yet, did ya?

                              2004 GMC Sierra SLE Z71 rcsb, 5.3/4L60E/3.73/G80 time bomb...3" lift, tinted 03+ Silverado tails, plasti-dipped 16" wheels (unknown brand), 285/75/16 Thunderer M/T Extremes, Thrush Welded muffler...

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