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5.3 to 6.0 swap

Discussion in 'GM Powertrain' started by kirk30013, Jun 25, 2011.

  1. kirk30013

    kirk30013 New Member

    hi guys i am a newbie here i recently purchased an 05 gmc z71 truck for a great deal with some problems the biggest is it has really low oil pressure at idle(turns the warning message on)but when i rev it it goes up to forty , when i am driving it also stays at 40 but despite that after long ride i can hear the lifters getting real noisy .so i have access to a 6.0 engine out of a z71 tahoe that rolled over i just wanna know how is is this swap will i have to rewire the whole truck engine harness or can i use everything off the 5.3 on this 6.0 motor remember my truck is aN 05 AND THE DONOR IS 03 I WOULD LOVE TO HEAR FROM SOMEONE WHO HAVE ACTUALLY DONE THIS SWAP NOT A BUNCH OF SIDELINE MECHANICS
  2. McMahan

    McMahan New Member

    dont want you to think I am a "sideline mechanic" but I have help build a few Silverado SS clones. For the most part everything will swap right over just make sure you get the 6.0 PCM. Do you know if it is a LQ4 or LQ9? Just to be on the safe side I would also take the engine wiring harness out of it too. Also not sure if your truck has a throttle cable or not but I know some friends that have done the swap have had to use a DR. X T/B wiring harness to make it work and had to replace the the gas pedal itself with the electronic one
  3. murdog94

    murdog94 New Member 1000 Posts

    I guess im a sidleline mechanic.
  4. kirk30013

    kirk30013 New Member

    thanks for the info not sure if its a lq4 or lq9 it does not have a throttle cable (mine) gotta check the tahoe and see. I dont want anyone to take offence to my (sideline mechanic) comment but you know how info from a friend of a friend get changed by the time you get it and all these opinions get posted your more confused than when you first started so i really wanted to here from some real hands on folks thats all the tahoe has everything there including the 4wd trans.
  5. Enkeiavalanche

    Enkeiavalanche Moderator ROTM Winner 1000 Posts

    HEY!!! How is the roof rack on that Z71 Tahoe? I need the roller on the back of it. from end to end.. Please Pm me or email me at enkeiavalanche@yahoo.com

    Thanks
  6. McMahan

    McMahan New Member

    should be a easy swap even if the hoe has a cable just put your T/B on it might have to get a adapter or spacer but I think you will be fine

    Good luck and let us know how it goes

    Justin
  7. silveradotrailblazer

    silveradotrailblazer New Member ROTM Winner 1000 Posts

    Welcome to the club. I'm pretty sure the '03 Tahoe is fly-by-wire throttle.
  8. Tim Josey

    Tim Josey New Member

    I know this post is a few months old now, but did you go through with the swap? I have an 05 Z-71 also and was considering the same thing. The 5.3 is a little wimpy when it comes to pulling my M\C trailer.

    Thanks

    Tim
  9. ZSI52

    ZSI52 New Member

    Everything will swap over. I read the other day that even the PCM will, You might have to get it tuned though.

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