I did exactly what you describe to level my 2015 2500HD gasser (went with the Cognito UCA and Kryptonite steering rods). The ride is great, pretty much like stock. Good luck. Sent from my SM-P900 using Tapatalk
I raised my 2015 GMC 250hd 2.5" then installed a Cognito UCA added Blistien 5100 shocks with spacers and installed differential spacers. Rides level and better than stock. Good luck. Sent from my SM-P900 using Tapatalk
Make sure if you crank the torsion bars you look at the clearance under the UCA'S to the frame. I replaced my stock UCA'S with Cognito and the ride is amazing . Sent from my SM-P900 using Tapatalk
I think the back of the differential is sagging and because of the large clearances in the bolt holes it allows it to shift towards the back of the truck. I recall putting the jack under the diff and jacking it up slowly while using a drift to align the hole. It was a real bear but I did the installation by myself.
If I remember right I put the spacer in the gap then put my floor jack in the area and used the jack to offload the weight while using a drift to help align the hole. I do remember it was a pain in the ass but after fighting it I got the bolt in. Hope this helps good luck.
Verify you have the right deep sockets and can access the nuts in order the loosen everything. I used impact tools and was able to install without jacking the truck up. Loosen everything then install 1 spacer and bolt at a time. Keeping the differential aligned with the mounting holes was a pain but doable. Good luck. Sent from my SM-P900 using Tapatalk
I cranked the torsion bar, replaced the UCA added Blistien 5100 shocks and spacers then had my 2015 GMC 2500HD frontend aligned. Truck ride was great. 3 months later I installed 1" differential spacers, did not affect the alignment at all but improved the steering feel alot. The differential is completely independent of the front suspension the axle splines just slide in and out of the differential as the suspension cycles.
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