I've been having trouble getting my T145 transmission into first gear occasionally. I had a new clutch with a slave cylinder installed and I also replaced the fluid. But it's still difficult getting it into first gear. My car has 158,000 miles on it. Any ideas what the problem may be?

 

make sure nothing is obstructing the clutch pedal

 

Could also be worn bushings on the shifter itself. When that happens you will get excess slop which keeps the shifter gate from being in the right position for shifting the gear.