Hello Guys, Something that hasn't concerned me but maybe its time to correct. after the drive train was rebuilt 2 yrs ago, Trans and motor (Im sure most of you remember). I noticed at some point that the speed was off (reading) The speed is reading on the speedometer about 15 to 20% higher.
I always see plastic gears on ebay (i believe color coded), is that what I need to correct? or might there be another reason this is happening?

If I need to change a gear, can I do that myself? or need to have the tranny shop do it?

Thanks bill v