What transmission does the LB7 have?
Auto Allison Transmission
6.6L LB7 Duramax Specifications Chart
| Manufactured Years: | 2001-2004 |
|---|---|
| Engine Design: | 6.6L 90-Degree V8 Turbocharged Diesel |
| Transmission: | 5-Speed Auto Allison Transmission |
| Vin Identification: (8th Digit) | 1 |
| Displacement: | 6.6 Liters or 403 Cubic Inches |
What transmission does a 2003 LB7 Duramax have?
Allison 1000 5 Speed
Chevy/GMC Duramax – 2001-2004 GM 6.6L LB7 Duramax – Transmission – Allison 1000 5 Speed.
Is LLY better than LB7?
Between the 3 LB7s I have a work and my LLY, the LB7 seems to be more ‘sluggish’, a bit less power and louder, BUT seem to be more of a consistant increase in power through the RPMs. My LLY, is much quieter and smoother. The power is dormant right off idle until the turbo spools, then it takes off like a rocket.
How much boost can a stock LLY Duramax handle?
The drive pressure for the turbo exceeds 80 PSI at 40 PSI of boost so you are creating more back pressure than boost and therefore robbing a lot of power from the engine. The max boost you can make with a stock LLY hairdryer and still be efficent/useful is around 32-34 PSI.
What kind of transmission does the Duramax LB7 have?
The LB7 was available mated to the Allison 1000 five speed automatic transmission or the ZF 6 speed manual transmission, with the automatic being a much more common choice. The LB7 was produced through the 2004 model year, when the LLY was introduced in its place.
What should the transmission temp be in a Duramax?
If you own a 2001-2004.5 LB7 Duramax your normal operating temperatures will run around 160-180 degrees. These transmissions will warm up when towing or driving in the summer months. 200-225 is very common when the ambient air temp is 80-100 degrees and your transmission is under an increased load.
What is the first year of the Duramax?
The LB7 Duramax was first introduced for the 2001 model year as General Motors retired its 6.5L Detroit diesel. In every possible way, the Duramax was superior to the outdated Detroit and marked a revolutionary turning point for GMC and Chevrolet pickups in the diesel marketplace.
Are there any problems with the GM LB7 engine?
As impressive as GM’s new engine platform appeared, the LB7 had terrible problems with fuel injectors failing. In fact, injector failures were so frequent that GM was forced to recall the poorly designed units and replace them with an updated design.