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> 1999 Tahoe 4x4 W/ 5.7 Vortec Needs Help, engine is blown at 230k miles
SinnerDC2
post Oct 27 2009, 04:34 PM
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I would rather replace the engine with a low milage 5.3 from the junkyard, but I dont know if the wiring or ECU will work? Does anyone know of a swap thread or website about swaping the vortec 5.7 to the vortec 5.3?

What about the tranmission? I might as well replace that with a new one. Will I have any problems going to the 5.3 tranny 4x4?

Thanks
Nick


--------------------
2002 Sierra 1500 2wd Ext Cab / Ext Bed - 5.3 automatic - 3.73 w/ G80 - tow package
Current - KN intake system, tool box, small wench on custom wench bumperett
Future - fender flares, 3" level / lift kit, nerf bars
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2COR517
post Oct 27 2009, 05:40 PM
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I wouldn't even attempt that project. Especially to go down in motor. I would look for a decent used 350, or just pony up for a nice fresh Goodwrench.


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Sharing my experience & opinions. Some I learned the hard way, some I learned from those I trust very much.
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West
post Oct 28 2009, 11:13 AM
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QUOTE (SinnerDC2 @ Oct 27 2009, 05:34 PM) *
I would rather replace the engine with a low milage 5.3 from the junkyard, but I dont know if the wiring or ECU will work? Does anyone know of a swap thread or website about swaping the vortec 5.7 to the vortec 5.3?

What about the tranmission? I might as well replace that with a new one. Will I have any problems going to the 5.3 tranny 4x4?

Thanks
Nick


Search at FullSizeChevy, someone there did this project. Be warned, they had to redo the entire harness, computer, engine mounts, tranny mounts, etc. It can be done, although I wouldn't do it.
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SinnerDC2
post Oct 29 2009, 08:44 AM
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QUOTE (West @ Oct 28 2009, 11:13 AM) *
QUOTE (SinnerDC2 @ Oct 27 2009, 05:34 PM) *
I would rather replace the engine with a low milage 5.3 from the junkyard, but I dont know if the wiring or ECU will work? Does anyone know of a swap thread or website about swaping the vortec 5.7 to the vortec 5.3?

What about the tranmission? I might as well replace that with a new one. Will I have any problems going to the 5.3 tranny 4x4?

Thanks
Nick


Search at FullSizeChevy, someone there did this project. Be warned, they had to redo the entire harness, computer, engine mounts, tranny mounts, etc. It can be done, although I wouldn't do it.



sounds good, I'll just find a 5.7 vortec then.

Thanks
Nick


--------------------
2002 Sierra 1500 2wd Ext Cab / Ext Bed - 5.3 automatic - 3.73 w/ G80 - tow package
Current - KN intake system, tool box, small wench on custom wench bumperett
Future - fender flares, 3" level / lift kit, nerf bars
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Mike G
post Nov 3 2009, 01:34 PM
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Name: Hey Mikey...



You are really talking two different motors here. The 5.7 is the old standard GM V8 motor, with vortec heads. The 5.3 is a GenIII motor, a total different configuration, even though it is a Vortec. This is why there is so much to do and consider.
--Mike


--------------------
92 GMC K1500 Z71--The work mule, refreshed warm 5.7L at 190K
02 Avalanche (wife's driver)--Front leveled and 285s look sweet!
01 Infiniti I30
95 Eagle Talon 5spd AWD TSi big turbo w/upgrades (I'm excited, it's for sale)
65 F100 big block hot rod
68 Merc Cougar XR7 (the wife digs looking cool in the summer)
03 Suzuki Volusia 800
04 Honda CRF250R
06 Honda XR50 (the 6 year old needs to have fun too)
90 Chaparral 20 ft bow-rider with 5.7L GM/Merc
Why yes, now there are four drivers in the household....
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gmtech4
post Nov 3 2009, 07:00 PM
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1993 Chevrolet
c10
Name: Robert



+1 ewwww,
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