1989 Ford Probe clutch problems

Transmission problem
1989 Ford Probe 4 cyl Front Wheel Drive Manual

I have a 1989 ford probe GT 2.2Liter turbo and I had just replaced the transmission about two weeks ago but now I was on my way to work and on the freeway I had went up a hill and started to lose power as if my clutch was going and it got worse so I put the transmission in 5-4-3-2-1- and nothing so I stopped on the shoulder on the road and tried to shift the trans again but the trans would shift but no power to the wheels can this be my clutch or transmission again and just to let you know I had to replace the slave cylinder on the clutch let me know what you think and thank you inadvance jason