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...
To shift a manual trans on the bench, remove the shifter, take 2 flat snapring pliers, the type that opens when you sqeeze it. use one to move the shift pocket from side to side and the other front to rear. my oe reman shop did approx 3800 to 4200 manuals a year and that worked very well...
Absolutely not. been retired longer than that but i can guess who it was....Someone charged you $1200 for an M5R1? ouch! did it come with a short block and lifetime carwashes?
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