In this video, we look at how to remove an Allison 1000 from GM 4wd vehicles. This applies to Chevy Silverado 2500hd, GMC Sierra 2500hd, Chevrolette Kodiak/GMC Topkick, Hummer H1, and most vehicles that are equipped with the 6.6L Duramax engine. If you’re doing a fully built transmission, replacing seals, doing the GM transfer case pump rub kit upgrade, or simply doing a refresh, this video will guide you step by step through the process of pulling the Allison 1000 transmission with tips and tricks to make the job easier. For a checklist that includes removal steps, torque specs, fastener and socket sizes, fastener locations, diagrams and other helpful information, check out the free download below.
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00:00 - 00:30 - Intro
00:31 - 00:49 - Helpful additions
00:50 - 01:03 - Remove the battery
01:04 - 01:30 - Drain fluids, chock wheels, & remove driveshaft(s)
01:31 - 01:54 - Remove transfer case harness and brackets
01:55 - 02:09 - Remove shift cable
02:10 - 02:25 - Disconnect NSBU, bracket
02:26 - 02:38 - Remove exhaust hanger bracket, main harness connector
02:39 - 02:56 - Support transmission
02:57 - 03:21 - Remove crossmember
03:22 - 03:55 - Remove t-case nuts, remove t-case
03:56 - 04:05 - Built Bottom End Performance ad segment
04:06 - 04:19 - Remove speed sensors
04:20 - 04:48 - Prep cooler lines for removal
04:49 - 05:22 - Remove starter
05:23 - 06:12 - Remove converter bolts
06:13 - 06:33 - Remove fuel lines
06:34 - 07:29 - Remove bellhousing bolts
07:30 - 07:40 - Remove dipstick tube, cooler lines
07:41 - 08:20 - Pull transmission