My problem is the following: I have a manual transmission Camaro SS/RS V8, The tranny IS NOT GRINDING,

It shifts nice and smooth from 1st thru 6, BUT... at times I cannot shift from 1st to 2nd or 3rd or 5th gear.

I can go from 1st to 4th to 6... but not as I mentioned above.

It doesn't do it all the time, that is why I am confused... Need advice...

Is it my Sink Box or ???

Thank you in advance.