ATSG TechTran service manual for the Allison 1000 and 2000 Series, covering operation, teardown, valve body ID and the internal wiring diagrams.
Rebuilding or diagnosing an Allison 1000 out of a Duramax Silverado or Sierra 2500HD/3500HD, or a 2000 Series out of a medium-duty C-Series or K-Series chassis, goes a lot faster with the factory-level procedure open on the bench. This is the ATSG TechTran technical manual for the Allison 1000 and 2000 Series, Generation 1, which also applies to the LCT1000, LCT2000 and 2400 Series variants that share the case family. It is a printed, spiral-flat book about 11 by 8.3 inches, so there is no subscription, login or laptop to keep clean.
The Allison 1000 is a clutch-to-clutch electronic unit: the TCM fires trim and shift solenoids on the valve body, and those decide which of the five clutches (C1 through C5) are applied in each range. That makes the clutch apply chart and the electronic section the most valuable pages in any 1000 manual, and this one has both. Per the listing, it includes:
This is a Generation 1 book, so identify what is actually in your truck first. Transmission Digest documents four valve body versions on the 1000/2000/2400: six-solenoid five-speed (2001-2003), seven-solenoid five-speed (2004-2005), seven-solenoid six-speed with two tubes (2006-2009), and a completely redesigned 2010-up body that does not interchange with earlier ones. The manual's early five-speed material and later six-speed changes help with the older units; on a 2010-up truck, expect gaps and verify specs against a current source. Our Allison 1000 valve body testing guide shows how to tell the castings apart, and the limp mode diagnosis guide is a good first stop before teardown.
Written for the Allison 1000 and 2000 Series from 2000 up, including the 6.6L Duramax 2500HD and 3500HD pickups and GM C-Series and K-Series medium-duty trucks, plus LCT1000, LCT2000 and 2400 Series units. It is a reference book, not a vehicle part, so there is no connector or casting to match, but if you have a late six-speed, ask us before ordering and we will tell you what to expect. Parts for the unit are on our Allison 1000 parts page.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is a Generation 1 book. It covers the original five-speed and the later six-speed changes, but the 2010-up valve body was fully redesigned. Use it for the hard parts and clutch layout, and verify late-model valve body and electrical details against a current source.
It is a printed manual, roughly 11 by 8.3 inches in spiral-flat format, about 12.8 ounces. Nothing to log into.
Yes. The electronic section includes valve body identification, internal wiring harness locations and routing, and TCM and solenoid electrical diagrams, along with diagnostic charts.
Yes, torque values and clearance data for buildup are included, along with the disassembly and reassembly order.
Yes. The clutch apply chart and electrical diagrams are what let you map a symptom or code to a specific clutch or circuit before you decide whether the unit needs to come out.
