66 chevy truck man

Ok I just had my 06 4l60e with 5k tuned and about 20 miles into driving it I got on it from a dead stop ran it up to about 4,800 rpm's and while shifting between 1'st and second it made a whining noise and bam all the forward gears are gone and so is reverse. Prior to the tranny taking a dump it was shifting awesome very firm at high rpm and shifting normal under normal driving. The truck drove great the last 3k with no problems until the tune. The motor is a 310 Hp 5.3 and the 4l60e came from a silverado with a 4.3 with 2k. Any of you guys know what would cause a 4l60 to not have any gears? Any feedback is appreciated.

Thanks

FLT

iTrader: (1)

Broken shaft or a broken pump.