ATS Stage 3 Transmission Package 04.5-05 6.6L GM Duramax LLY
This product is vehicle-specific. Select your year, make, model, engine and transmission to confirm compatibility before adding it to your cart.
Select your truck to continue
Ships directly from the supplier. The final shipping cost will be shown before payment.
- Ships from ATS Diesel Performance
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
✅
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
✅
Diesel Power Products directs warranty claims to the respective manufacturer; coverage and duration depend on that manufacturer and product. Its one-year manufacturer-defect warranty applies only to products manufactured by Power Products Unlimited Inc., not all products it sells. Manufacturer inspection is required; DPP does not pay inspection/return shipping or labor.
Return and warranty information is based on what Diesel Power Products offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
Diesel Power Products warranty policyView complete warrantyProduct conditions
Return and warranty information is based on what Diesel Power Products offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
Professional installation is recommended.
- Return eligibility
- Diesel Power Products states a 30-day window from receipt for eligible new, uninstalled, unopened and complete items in original packaging, with prior approval/RMA. Custom tuners and specified opened tools are excluded. Customer pays return shipping; original outbound shipping, including initially free shipping, is deducted. No standard restocking percentage is stated for ordinary approved returns. Based on what Diesel Power Products offers.
- Return window
- Not stated for this product; see supplier terms
- Restocking fee
- See supplier terms; no product-specific fee stated
- Return shipping
- Based on the supplier’s return policy; see terms
- Made to order
- No
- Backorder status
- Not backordered
- Cancellation
- Subject to supplier terms; contact FullSpecDiesel before requesting cancellation
- Warranty provider
- Diesel Power Products
- Warranty duration
- Product-specific duration not stated; see supplier terms
- Compatibility
- Listed for specific vehicle configurations
- Legal use
- Street legal
- Processing estimate
- 3–7 business days supplier processing
- Shipping
- Shipping calculated at checkout
- Signature
- Signature delivery required
- Supplier
- Diesel Power Products
Product compatibility is based on the vehicle and product information provided. Review your selected truck, product options, measurements, modifications, and installation requirements before ordering.