Well, the LE3.91 gears avg $250, about $150 for bearings and shims. That price sounds high for the labor. Takes appx 1 hour to remove the center section, another hour to install, plus the time to setup the rear. Should be able to be done in a 4 hour window. Dont let them charge u GM book labor time.
I should add, i plan to pull mine back out Monday and put a Eaton Truetrac in it. I plan to be around $1300 including the TrueTrac which cost me $585, new replacement 3.91, new bearings, shims, and labor.
2012: e85, 80mm TBody, CAI w/scoop, Solo HFC, ZL1 FP, Magnaflow TruX, Dynomax VT, Elite catch can, HP Tune, Throttle Contoller, BMR; Springs, Sways, Trailing Arms, Toe Ends, & Safety Loop, Koni str.t, Pioneer Z150bh, Phoenix Gold Sub, Hertz speakers & 5ch Amp, 1LE rear with 3.91 gears, BMR bushings, Baer Decela Rotors, Goodridge brake lines, Brembo(GM) 4 piston calipers, Hawk Ceramic pads, ported intake, Circle D 5c. 12.3@112 old setup
2017 HyperBlue ZL1 A10 on order ** Born 3/17/17