My third gear grinds on an 1-3 or 2-3 shift but not on a 5-3 or 4-3 shift. Any ideas? All the other gears are fine. I was thinking at first that it was the syncro on third gear but it seems like that would have it goign in hard from both directions...
Thanks
Third gear problem
you will need a hydrolic press to seperate the internal components and special sleeves to press it back together. Its not a big deal if your not trying to hot rod your car. I have heard many people use a synthetic oil to cure grinding conditions. although a recent class at nissan tech school they suggested not doing it and said if a car was still under factory warrenty,if it was tested to have a synthetic fluid in the trans when a failure occured the claim would be denied. They stated the synthic oil was allowing the syncro to slip on its brakeing suface and not perform as designed. On this issue I am kinda on the fence so heres my input. If my car was as old as yours is, it is obviously no longer under warrenty so I would be willing to at least try a synthetic lubricant to see if it has any improvement. If it got worse I would switch back to the normal gear oil and drive it till it either grenaded the trans or I sold it. If it grenaded I would hit up the junkyard for another trans and purchase the exchange policy so if anything was wrong I could get another one. I would not even waste my time trying to rebuild it as the parts to overhaul it would likely exceed the price to replace it with a used one. not to mention the time difference between the 2 tasks.