rail buggy problems

I'm running a 1641 with a 3 rib trans. Runs good. Has nooo bottem end power tho. I just put the 3 rib in and I'm actually really disappointed cause I was told that its a really low torqy trans. But this trans is a turdddd. Un less its somthing else? Compression test was very good too... any one know what would cause it to have no power?