99 Yukon to LS1 swap Help/ info please

[remauto1187]

The yukon has the 5.7 with the distributor. And the ls1 uses individual coils as i'm sure you already know. I've searched the gmt400 on the net and im sure that's what I have.

You have the VIN R 5.7L in there right now. The motor mounts will not bolt up to the LS1. They do make plates that bolt to the LS1 block and allow you to retain your original mounts. What colors are the wire harness plugs that connect to your engine computer (PCM). Your current 4L60E tranny will bolt right up to the LS1. You will need a spacer that is made to go between the rear of the crank and the front of the torque converter. The distance from the end of the crank to the face of the engine bellhousing is like .4" shorter than your vin R 350. I would just use the LS1 flywheel so you can use the starter that comes with it, Otherwise you will need to elongate your flywheel holes for the torque converter holes to line up for its bolts.

[ccreddell]

He wouldnt be able to use the flywheel, because the LS1 is in front of a manual trans. He will want to get a LS1 flexplate though.......

[PitchBlackC3]

All 99 Tahoe/Yukon/suburbans are GMT400
Just a typical OBS to GenIII conversion. Look at the sticky like somebody posted above.