Slight grind going into third
Thread Starter
Team Owner
Joined: Jul 2008
Posts: 23,419
Likes: 22
From: In limbo
St. Jude Donor '13-'15, '17 thru '22
Slight grind going into third
Somewhat intermittent. Sometimes it only feels like a little less than smooth. Once on a 20 mile back-road ride today, it actually made a little grinding sound that my daughter noticed. Doesn't seem to happen downshifting, only upshifting. All other gears operate normally. Thoughts?
1970 454, M-20
1970 454, M-20
Drifting
Joined: Jun 2010
Posts: 1,781
Likes: 15
From: Oxford Ohio
Linkage or synchronizer. If you see how the synchonizers work. It's amazing how they bring gears up to speed for a smoth shift at speed. A worn one may not be bringing the third gear to speed because of slipage. The ID of the synchronizer is probably as or more important than the teeth.
If the tranny has a high number of miles, I'd either do or have done a freshen up and parts inspection.
If the tranny has a high number of miles, I'd either do or have done a freshen up and parts inspection.
Melting Slicks
Joined: May 2006
Posts: 3,303
Likes: 14
From: Lynn MA
check and adjust linkage as needed, make sure shifter is firmly mounted to trans, have seem this happen when body bolts of shifter loosen, do a flush, swap to synthetic which may buy you some time.....maybe start looking for a rebuilt to swap in, most places get around 800 outright for a Muncie, rebuilt and ready to go in
Thread Starter
Team Owner
Joined: Jul 2008
Posts: 23,419
Likes: 22
From: In limbo
St. Jude Donor '13-'15, '17 thru '22
Thanks guys!
That is pretty much what I figured - worth crawling under there to check the linkage, I'll check that the fasteners holding the shifter on are tight too, I didn't think of that. If all that checked out, I assumed it would be a synchro, but I have never taken a transmission apart, so I admit that most of the specifics of what goes on inside are kind of a mystery to me!
That is pretty much what I figured - worth crawling under there to check the linkage, I'll check that the fasteners holding the shifter on are tight too, I didn't think of that. If all that checked out, I assumed it would be a synchro, but I have never taken a transmission apart, so I admit that most of the specifics of what goes on inside are kind of a mystery to me!
