The gearbox from the car I'm rebuilding (Skoda Estelle '72, rear mounted engine, RWD, manual transmission) has the following problem:
- I can shift up/down with engine off
- I can shift up/down with engine on, car static, by keeping clutch pressed
- I can shift up to any gear while running
- I can shift down to from any gear while running EXCEPT engaging 1st
When I want to shift say from 2nd to 1st while running, I can't without "rasping" the 1st pinion a lot, like this gearbox has a "direct" 1st. I'm discarding clutch problems, since otherwise every gear would have such problems. I tend to think it is something with the 1st/2nd synchro. My question is: would it be its friction rings?
What else can yield that symptom?
Reading its Haynes manual it says "Synchromesh: on all forward gears". So it implies 1st gets synchronized, right? In my case, it is almost impossible to get back to 1st without almost stopping the car.
UPDATE (July 10th, 2017):
Yes...it has synchromesh. I wonder which component of it, on this design, could make the issue (impossible to shift 2nd to 1st while moving)