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1999 5.3 go in 2007 gmc 4.8

BrianHemphill199

By BrianHemphill199
in Ask A GM Technician

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BrianHemphill199 New Member

BrianHemphill199

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Posted

I need some advice on if a 1999 5.3l will go into a 2007 Gmc Sierra with a blown 4.8l. Will the transmission bolt up? Motor mounts? Wireing? Need info asap about to buy this truck but don't want to if not going to work. THANK YOU!!!

newdude Senior Enthusiast

newdude

Posted
Posted

1999 is cable throttle, 2007 is drive by wire. The electronics system between the two may differ quite a bit actually. ECM is different as well.

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

Fairly certain all the LS motors have the same bellhousing pattern ... & I would imagine the same for motor mounts .. but don't quote me on any of that.

 

My main concern would be the electronics. That's the big monkey wrench thrown into the works of what used to be a straightforward swap back in the day. That can be a royal pain in the ass ... and I would bet they're completely different from '99 to '07. There's ways around all of that if you're determined enough.

 

EDIT: damn computer never tells me when someone else posts - didn't see 15H's post above me ...

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