Well not much realy.
The trans, 4t40E is on the SE , 4t45e in the GT.
The exhaust(stock) is larger on the GT and has dual outs instead of single like the SE.
Also the Air/fuel ratios are higher on the GT.
Some suspension components are larger on the GT,
like the sway bars, springs.
The GT has Disc brakes in the rear instead of Drums.
Check in the parts lists I put up in the
Tips & maintenance section.
IT's all broke down with pics there
