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MTU Alum

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MTU Alum last won the day on May 22

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  1. There are no updates to steering calibration for MY22 trucks. Which tire do you have on the truck? #iworkforGM
  2. Its fine. The corner weights are different and torsion bar spring rate varies some. The adjustment allows to even out the variation. #iworkforGM
  3. The trailer label is a reference for J2807 for that model. That hitch is good to 15% of 36,000 lbs for GN, 15% of 32,000 lbs for 5th wheel, and 10% of 20,000 lbs for conventional. If you want to 30% pin on a 10k trailer, you can as long you stay within the GAWRs, GVW, payload, and GCW. The other values on the trailer label are reference for what that model is certified to for SAE J2807. #iworkforGM
  4. Dealer can put picoscope on seat track and determine which component is causing the vibration. It maybe how the trucks are but they can see if something isn't right. You can get some drones when torque converter is locked and you are lugging the engine. #iworkforGM
  5. Load range E tires has maximum cold inflation pressure of 80 psi. Manufacturer can lower the pressure from there to meet loading conditions or performance targets. #iworkforGM
  6. What does upgraded FW/GN pin mean? Capability of truck (GVW, GCW) or hitch weight capability? #iworkforGM
  7. It just pulls the 2021 calibrations into 2020. Definitely recommend you guys doing this. #iworkforGM
  8. You probably have to talk to dealer and see if they would open a TAC case on it. There probably is a series of fuses that could be pulled but its, easier for us to disconnect battery. #iworkforGM
  9. The wheels moving will cause serial data bus to wakeup and this could cause modules to start to activate things. Best case serenrio your battery is dead at arrival. We have seen melted brakes, fires, etc. I know of at least three broken 10 sp cases of people not following the directions as they exist now. #iworkforGM
  10. Here are the steps, they are also in your owner's manual. You can only flat 1. Put transmisson in neutral and then shift trans
  11. Just to update some incorrect information in this thread. On gas models, the rear axle and drivetrain is the same between 2500 and 3500srw. The rear suspension is the main difference. The 2500 is a two stage leaf spring where the 3500 is a three stage. The 3500 is not just a 2500 spring pack with third stage added. The main four leaf pack is same between the two but, the second stage (bottom leaf) engages quicker on 3500. Unloaded the 3500 rides similar to 2500 but a little worse. On rougher roads the 3500 is worse due to the second stage, higher force in rear shock, and higher tire pressure. #iworkforGM
  12. 1. 3500 srw and drw run the same rear axle ratio. The smaller OD tires on drw help with giving it a higher overall gear ratio. 2. I believe the front brakes are same but rear are larger on drw. 3. Gear set I believe are the same but axle shafts are stronger on drw. 4. Biggest difference is the rear spring pack. The drw has alot more force in the underloads. #iworkforGM
  13. The ride is the same between off road and base suspension. The 18 and 20 tires are similar as well. I know the gas trucks were tuned with 18 in tires and the diesel trucks were tuned with 20 inch tires. In general, all you mentioned are all similar in ride performance. #iworkforGM
  14. It could be due to test weight class jump. The EPA mass is the manufacturer must include any option that has a take rate over 33% in the vehicle mass that it certifies emissions and fuel economy. Cheveolet typically uses LT model and GMC uses Denali. If chevy is selling more highly contented vehicles, then the test weight class may jump which puts more load on dyno. There is a bit of balancing act between selling more profitable vehicles and buying credits to offset the CAFE impacts. #iworkforGM
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