yukon 4l80e AWD 6.0 swap

[HotRod559]

Just finished a 4l85 swap. I did do a segment swap but trans is shifting super late, speedometer is only reading 30-40mph, so possible output speed sensor issue? LT1 swap.com suggests that pcm to front input speed sensor on 4l85 wires pulled from 4l60 connector, can go to either pins 1 or 2. Also 4485 tcase has no speed sensor so speed sensor that once was in old tcase now plugged into 4l85 rear output speed sensor. Any information on this is greatly appreciated.

06 Yukon Denali, AWD BorgWarner 4485, LQ4 6.0, Elgin 1840P 228/230 .585/.585 112LSA, PAC 1219 valve springs, Delphi 25317628 injectors, TransGo HD2 shift kit, 4l80 rebuilt torque convertor 2400-2700 stall, tire size 275/55R20

denali 4l80 first drive.hplFile 3 4l80 segment swap.hpt

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Did you get your issue resolved? Found myself in a similar situation. The issue I found in a swapped 4L80E transmission was it was originally a 4wd converted to a 2wd. It did not have a rear speed sensor reluctor so the speed sensor was only picking up the park paw teeth which is about half as many teeth as a reluctor wheel. Cheap fix but lots of time to correct.