it happen on highway when i driving over 90mph and shifting in to 5th gear it grinds, even wores if i driving more than 100mph.

i think it happed after i switch to neo hd oil.

What should i do??
if i take it to dealer i don't they think they will fix it under warr. because it happen over the highway speed limit they would say i raced.

 

Well if it happened after you changed to new oil, it's probably due to the oil. Maybe try another oil?


:banana:

 

Mine has 50k miles and still shifts like a dream. I changed the trans oil at 15k with cheap 80-90 hd oil (valvoline I think).... and will be changing it again today!

 

At speeds that high, the absolute speed of 5th gear compared to 4th gear is WAY slow. It takes longer to shift from 4-5 at high speeds than any other shift at any time except for 2-1 downshifts. Basically what I'm saying is shift to 5th with less pressure and let the synchro have more time to do its job. Or maybe stop driving fast enough to get arrested.