Its the rubber isolator in the shifter....I had the same thing happen to me when I put on a new ****.....it just made a poping sound and that was it....you could see where it had ripped the inside...I just got the old shifter from my 94z28 and put that in

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94 Z28 m6
cold air,air foil,b&m ripper,vortech tb elbow,underdrive pulley ,flowbasterd muffler,moded maf,poly trans mount,fuel pres reg,exhaust cut out........new mods 355/with 12# of procharger boost

99 Camaro SS m6
#133
MTI air lid,some free mods,B&M Ripper,MacEwen Motorsports WFG with no high beam thingy....slp longtubes w/o cats,zo6 maf,z06 clutch,jet pcm,qt cut out

Big Red(truck)
406 ci,700r4 w/3000 rpm stall,3.73 10 bolt.
No more 406..kaboom / on the way 427 mighty mouse

 

Strange, my **** spins and it drives me nuts!