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Message: <blockquote data-quote="stutaeng" data-source="post: 25266" data-attributes="member: 6175">What years are the vehicles? If both are Gen III-based vehicles:1. Best to keep your intake and ECU, just get a reflash for the new engine/transmission.2a. You need to swap your T-case input shaft that fits the spline pattern of the 4L80e. Or2b. Swap a NP246 that was already mated to a 4L80e such as from a Suburban 2500.3. LT1Swap.com has information on the wiring harness pin out swap for the 4L80e conversion. It looks difficult but it's not.4. You may need driveshaft shortening/extension due to linger transmission? I'm not really sure on this actually. My swap was a 2wd...<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused    :confused:" loading="lazy" data-shortname=":confused:" /></blockquote>