center diff in rc8t ?'s

[plettenbergs]

do you have to change gearing in center diff if you change spur gear?

i put on the 46t spur gear and had a GREAT time with the rc8t...i love this truck...it actually ran cool but after about 15 minutes it heated to 150 so i let it cool for a while and ran the Dual BL!!...GOOD TIMES!!

when i put the diff together with the new 46 gear i did not install shims...after 5-10 minutes i noticed center diff crunching a little and installed 3 small shims...it seems to be smooth now

1)is my diff beat?
2)i have several UE spider 8's...will they work and should i install one?