99Silverado5.3

ridnlow · December 13, 2005

Hey Jared,

I was wondering if you could give me a estimate on how much it would run me to swap my 5.3 for a 6L.. I dont think I should waste my time modding my 5.3.. I am just going to start fresh with the 6L.. Where did you get your motor and where do you suggest looking? Will my current harness work or would i need to get the harness with the motor as well.. It should mount up to my 60E right??

TIA,

Drew

99Silver6.0 · December 18, 2005

Hey Jared,

I was wondering if you could give me a estimate on how much it would run me to swap my 5.3 for a 6L.. I dont think I should waste my time modding my 5.3.. I am just going to start fresh with the 6L.. Where did you get your motor and where do you suggest looking? Will my current harness work or would i need to get the harness with the motor as well.. It should mount up to my 60E right??

TIA,

Drew

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YO!!

Ok. Price is really gonna depend on which 6.0 you want to get. Bone yards love to tag Cadillac and HO onto a motor and charge 1000 more or so for a motor. I looked for 6 months. I went for a lower CR LQ4. I didnt want to pay 1000 dollars more for 20 extra HP from the LQ9. Anyway, I got my motor for $1250 complete in Oklahoma City. It had something like 4900 on the odo in the donor truck. Not saying modding the 5.3 is a waste. But the 6.0 has alot more potential for power and TQ. All you will need is the motor and a tranny that will stand life behind that motor. The stock 60 will not last! Yes it will bolt up just fine. If you have a V8 right now you dont need a harness. You also do not need a tune for the motor to run. It will start, idle and run fine on the 4.8/5.3 PCM. AS LONG AS ITS NOT A 99 PCM! They had smaller injectors than the 2000+ trucks did. You will need the flexplate off your 5.3 to put on the 6.0. Also. Very, very important is engine model year. You MUST look for a 2001+ 6.0!! Engines before that year had a longer crank snout and will NOT work with a 4L60, only a 4L80. So be careful there. If you go look at a motor, just make sure it has aluminum heads with 317 stamped on the corner and your good to go.

www.car-part.com is your best bet for searching out a motor. When you look for one you want the engine with a "U" suffix. That denotes the LQ4. Or if you want an LQ9 its an "N".

ridnlow · December 20, 2005

Thanks for the help.. It will be a little while before I get started but I wanted to go ahead and start looking and get some price figures.. Im guessing I will need a built 65E.. I am in the process of swapping out my 99 pcm for an 02 but I got it tuned for 99 injectors.. Thanks for the help!

99Silver6.0 · December 21, 2005

Thanks for the help.. It will be a little while before I get started but I wanted to go ahead and start looking and get some price figures.. Im guessing I will need a built 65E.. I am in the process of swapping out my 99 pcm for an 02 but I got it tuned for 99 injectors.. Thanks for the help!

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You can use a built 60E. Thats what I did. IMO vacuum modulation is a big kicker int he long run. Pulse width modulation is what shortens a tranny's life. TM cuts line pressure to soften a shift. But all that does is starve the 3-4 clutch pack of fluid and frys it. That and PWM just sucks anyway. I do not want the PCM having any part in chaning my line pressure. Downshifts and WOT upshifts are very, very, very, very positive and quick.