2007 Volvo - D16 - 18 speed UltraShift jerkin climbing hills

Good day everyone,
In my 2007 Volvo with D16 With Eaton Ultrashift trans. I just had a local shop dropped the trans and replaced both rear motor mounts. Upon completion I bobtail about 150 miles to the house with no issues. Took a 10,000 lbs load out and everything was fine, however on the return reload was 44,000 lbs and every time I’m climbing a hill the truck start violently jerking and feels like almost unnoticeable quickly cutting out. Whenever it does I watched the RPM gauge but don’t see any movement but I start loosing power. The truck fires right up with no long cranking so I’m not suspecting injectors or cups. I have check all the trans wiring and all seems intact, even unplugged the sensor harnesses and plugged them back just to be sure. I checked fuses and wire on batteries all good there. My batteries are fairly new and dash show it’s charging 14.1 vts.
There’s wasn’t a problem before the trans was dropped.
Any suggestions where I should look?

 

Ok will do, thanks!

 

Clutch was replaced about a year and half ago and yes it was inspected and was good. The indicator had barely moved and was still on the good mark. The only problem was when they replaced the clutch they broke the grease tube from bearing to the nipple on the driver side of transmission so all greasing wasn’t getting to the bearing, so he put one in extending straight down through the hole and greased it.

 

I checked the wiring and harness again today and nothing seems to be out of place. I will replace the wiring anyway and go from there when I get home because it still has the original. Seems to do it more on cruise control. Also notice while descending down hill on cruise it’s jerking and jolting only on cruise. Any ideas?

 

Here’s an update to my problem. It was the engine speed sensor. I replaced both speed sensors and I’m a happy man. This baby is running smoother than ever. Long before I had the work done which developed this bad jerking going uphill, there was another problem when decending from a hill with cruise control engaged, every now and again I feel the truck slightly jotting and if I tap the gas pedal it will stop jotting, that is gone too.
Just elaborate to let everyone know how I discovered the issue Incase someone experiences same issue. After checking all wiring, grounds and harnesses with no vail I decided to pull injectors and check the cups. They were all good however since I was that deep in it I pulled the cups and install new ones and new o rings on injectors, adjusted valves and all that. Went back out the problem did not go away. Made a trip and back home again, this time I remove the speed sensor on the output of the transmission which I had replaced about six months ago, it looked good so I installed it back. Got back out for another trip, about 200 miles down the road an error code for timing, crank sensor popped up and sure enough when I got back home and replace them, it’s been about two weeks now and absolutely zero jerking or jotting. The speed sensor on the right corner of engine by timing cover was a piece of cake easy to replace, however the one on the flywheel housing towards the left corner of the engine was a pain in the rear because of the steel pipes running behind the engine, and that sensor was covered with debri when I removed it.
I hope this helps someone who may develop such a problem. Happy trails fellas!