How-To Remove Allison 1000 Transmission 

Here is a short run thru of how to remove an Allison 1000 5-Speed transmission from a 2003 GMC Duramax. This process is the same for all 2001-2005 5-Speed trucks. While this process varies for 2005-present 6-Speed trucks.
Steps:
-Remove Starter, tie to frame rail
-Pull off fan (Unless you have a 36mm box end wrench)
-Remove torque converter bolts (x6)
-Remove rear drive shaft
-Remove front drive shaft
-Remove Transmission cross member
-Un-plug all T-case wiring
-Remove T-case breather
-Remove T-case
-Remove all Trans wiring
-Remove fuel line brackets
-Remove exhaust v-band
-Remove Trans cooler lines
-Remove all bell housing bolts
-Remove transmission
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Alan Walker - Fade [NCS Release]
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Disclaimer - Some information in this video may be incorrect or not manufacturer recommended. I am not responsible for any problems or damage you encounter. Watch and follow this video at your own risk.