615s2k

ok when i redline my car and shift from 1st to 2nd it just grinds and i had 3 people drive my car, so i know it wasn't cause of bad driving..... so any way i can drive it regulary annd it shifts fine but when i redline it from 1 to 2nd it grinds...my brother said it was a syncro, my friend told me to change the transmission fluid to gm syncromesh .......anyone know what this is and how i need to fix it and what price range i am looking aat?



thanks

apex2k

Do a search and you will find:

a) this is a common complaint

b) there are a variety of causes and solutions depending on said cause

so,

c) there is no easy answer, sorry

A few suggestions, starting with the simplest.

Make sure the clutch is fully depressed and staying that way during the shift. Moving the seat up a click so you really bottom it out may help, and make sure the mat is not impeding pedal travel.

Give the synchros a half second to do their job, the rotational speeds being altered are significant, they need a bit of time to work (physics are physics, they call them laws for a reason).

Clutch cable may need a bit of adjusting or fluid may need a bleeding or a change.

After that, a change in transmission fluid has helped some although there are different opinions on which works best under what conditions and for how long.

Thennnnn, you get into the fun rebuilding stuff. There are probably others to mention but my mind is not up to the task, and do not rule out technique being the cause, as 3 people may all be making the same mistake. Good luck.

dreamcation

I've made about 3 or 4 post on the subject, so a search would give you a lot of info but if you want to skip all that then change your diff and tranny fluid, if that doesn't help you might have a syncro problem and you'll need to do a search on that

Billman250

To start, change the tranny oil with Redline MT-90. Then adjust the clutch rod under the dash to zero freeplay, it will likely resolve it.