Grind in Reverse

I had longtubes put on like 3 weeks ago and the guys that did it said my clutch was bad so they adjusted it, well now i have a grind in reverse, only reverse. Im hoping all it is is vibrations from the poly engine mounts i had put on? Ive always had a grind putting it in gear but i know thats the synchros. Help please......

Thanks guys

Eric
 
T-45's dont have synchro's in reverse. Mine and all others will grind if you go straight from nuteral into reverse without either putting it into a forward gear, or holding the clutch in for over 5 or 6 seconds before putting it into reverse. Same with slightly rolling forward, it will grind.

Now if you are allready putting it in a forward gear before reverse, I dont know.