First Gear Help

Hello all - I am a novice with 4 Speeds - so I need some help from you guys with much more knowledge in this department. I just installed my 4 spd in the car. It was shifting just fune thru all 4 gears outside of the car, but, now that it is in the car it does not want to go into first gear. Could this be a clutch adjustment? Is there an initial clutch setting proceedure I should go thru? Do RPMs effect first gear? Any other suggestions for initially setting things up properly after having everything apart and freshly installing.
Thanks for any help!!
Author: admin