5.3l to a 5.7l zz4 help

Asked by Joseph Jun 24, 2021 at 01:10 AM about the 1999 GMC Sierra 1500 SLT 4WD Extended Cab LB

Question type: Maintenance & Repair

I have a blown up 5.3l in my 99 gmc Sierra  and
was wondering what I needed to swap in a zz4 5.7l
engine and how hard it was and will the
transmission work. I'm trying to use the zz4 cause I
already have it and would be the cheapest fix  I
think

1 Answer
40,085

beatupchevy answered 3 years ago

It's usually best to go with how the vehicle was designed , it's not impossible but some things won't match up like the computer . Maybe get a crate motor or rebuild the original . either way you're looking at $$$ . What's the condition of the truck frame ? Tranny ? Rear axle ? Is it worth it ?

Mark helpful

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