Finishing up on a 4.9L swap now. Can't help with the bracket but they are relatively easy to make but I can help with the 4T60e axle part numbers.
Passenger side: Cardone 60-1114
Driver side: Cardone 60-1078
Both of these axles are direct fit requiring no extra work
If you need any other swap info feel free to ask.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE " [This message has been edited by Dennis LaGrua (edited 09-22-2014).]