beezee
True Classic
I'm reviving this thread to provide an update. As I stated earlier, I was stoked to have the car shifting properly again with no more grinding in third, but my happiness was short lived. After only about 2000 miles third gear started grinding again. So this past week I pulled the transmission apart and this is what I found:
It seems the third gear synchro ring is a poorly made after market part. The following is a picture of the original synchro (right) and the replacement synchro (left). The original part has machined top and bottom surfaces and the replacement does not. More importantly, and difficult to see in the picture, the replacement is not quite round and has high spots on the circumference.
The following is a picture of one of the high spots on the replacement synchro:
The next picture shows an original part with a much more uniform wear pattern:
Another difference I noticed was the inside surface. The replacement part is smooth:
The original part has machined grooves:
I am pretty sure that what has happened is that the high spots on the outer surface of the replacement synchro quickly became polished after a short time and lost the ability to slow the gear while shifting. So now I am going shopping for better quality synchro rings.
I am not sure what the purpose of the grooves are on the inside surface. Suggestions???
Brian
It seems the third gear synchro ring is a poorly made after market part. The following is a picture of the original synchro (right) and the replacement synchro (left). The original part has machined top and bottom surfaces and the replacement does not. More importantly, and difficult to see in the picture, the replacement is not quite round and has high spots on the circumference.
The following is a picture of one of the high spots on the replacement synchro:
The next picture shows an original part with a much more uniform wear pattern:
Another difference I noticed was the inside surface. The replacement part is smooth:
The original part has machined grooves:
I am pretty sure that what has happened is that the high spots on the outer surface of the replacement synchro quickly became polished after a short time and lost the ability to slow the gear while shifting. So now I am going shopping for better quality synchro rings.
I am not sure what the purpose of the grooves are on the inside surface. Suggestions???
Brian