99 is a fairly easy swap really. The tranny bolts right up to the block, but the input shaft in the transfer case is different as a 60 uses a 27 spline output and an 80 uses a 32 spline shaft. You do have to change a couple of the pins in the trans plug, and I believe you have to run one wire from the PCM to the tranny. Then you have to have a 2500 program flashed into the ECM for one with a 4L80E as one of the solonoids in the 80 works backwards from the 60 as well as the gear ratios are considerably different between the 2.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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