Possible transmission issues

Had my back spacer plate break on my starter mount had to pull the transmission out. Well, long story short after getting it all buttoned up, I have reverse first and second gear works great, but drive it can barley make it up a hill at 2500 rpm's. All connectors are snapped in, fluid levers are spot on, nothing is burnt. Just dumbfounded because everything worked great before the back spacer plate.