Hello to all. I am new here. I am working on a 96 e40d. I rebuilt this unit and installed it back in truck. 2wd dually 1996 7.3 diesel Problem is I jacked up truck after install and it shifted like it was suppose to. Several times I ran it through all gears. I let truck down and backed out of shop. Put it in drive and barely took off. I pulled it down in manual 1st at it tried to bog engine down. I jacked it back up and it will manually shift from first to second but that's it. No 3rd reverse is fine. When ideling in second and pull it down in first it will bring wheels to barely a crawl and u can hear it pull engine down. There's no check engine light on and light on shifters off. I am totally lost on what to do. If anyone can help me I will greatly appreciate it.