it is not very common for a manual trans to ""suddenly" vibrate, make sure that the bolts are tight. also, is there alignment dowls between the motor and trans?
Do not run gear lube if you are going to run it in the winter. run GM Synchromesh..#12345349 regular 80w gear lube can not get in to the needle bearings and it will like **** until it warms up...
The fm145 was not a bad trans.. the 2 biggest problems were people putting 80-90 in them and splitting 5th gear on the mainshaft by driving 25mph in 5th thinking they will get 40 mpg...
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