The Allison 1000 has no doubt proven itself since its mating in 2001 behind the first Duramax equipped GM trucks. Its longevity, even when pushed with moderately heavy loads and higher horsepower have put it at the forefront of transmissions until recently. However, as miles and horsepower accumulate, these transmissions will find their failure points, and ATS has the cure to ensure your horsepower is getting to the ground efficiently.

By increasing the capability of the torque converter, clutch surface area, and line pressure, the transmission can hold 200% more torque than stock. The result is a setup strong enough to handle aftermarket fueling, turbo(s), and tuning, yet is still smooth enough to tow and daily drive with.

SHIPPING POLICY - Due to the size and weight of transmissions, they cannot be shipped through traditional couriers, such as UPS, FedEx, USPS, etc. and MUST be shipped via truck freight. We do not offer free shipping on transmissions, however, we do offer a very competitive rate charged at checkout checkout. Once your core transmission is ready for pick up, you just need to give us a call or send us an e-mail with your original order number and the core tag on the transmission, and we can supply you with a quote on the return shipping as that is not covered in the original shipping cost. Otherwise, we give you the option to coordinate the return shipping on your own and independently pay your courier of choice. As always, if you have any questions, give us a call or send us an e-mail.

ATS GM 6.6L Duramax 4WD Allison LCT1000 Transmission Package Stage Build Comparison

	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5	Stage 6
Horsepower Rating ⓘ	550 hp	650 hp	750 hp	850 hp	950 hp	1050 hp
ATS Allison LCT1000 Transmission	✅	✅	✅	✅	✅	✅
Five-Star® Torque Converter	✅	✅	✅	✅	✅	✅
Deep Pan Transmission Pan	✅	✅	✅	✅	✅	✅
Co-Pilot® Transmission Controller		✅	✅	✅	✅	✅
ATS Billet Input Shaft			✅	✅	✅	✅
ATS Billet Intermediate Shaft				✅	✅	✅
ATS Billet Output Shaft					✅	✅
Billet P2 Carrier, C2 Hub, P1 Sungear						✅

ATS GM 6.6L Duramax 2WD Allison LCT1000 Transmission Package Stage Build Comparison

	Stage 1	Stage 2	Stage 3	Stage 4	Stage 5
Horsepower Rating ⓘ	550 hp	650 hp	750 hp	850 hp	950 hp
ATS Allison LCT1000 Transmission	✅	✅	✅	✅	✅
Five-Star® Torque Converter	✅	✅	✅	✅	✅
Deep Pan Transmission Pan	✅	✅	✅	✅	✅
Co-Pilot® Transmission Controller		✅	✅	✅	✅
ATS Billet Input Shaft			✅	✅	✅
ATS Billet Intermediate Shaft				✅	✅
Billet P2 Carrier, C2 Hub, P1 Sungear					✅