Thank you !!!!
Yes, I just got it back from the dealer. The service department told me it's because I installed the 4.10 gears and I was told that they do not not have a program for the 4.10 which is weird because I used stock 410 gears which is available through GMC. So for right now the truck runs great but I do not have cruise control for the highway speeds. Any suggestions? Thanks for your help.
Yes, Cruise Control. Yes, The original dealer installed a Hypertech inline speedometer Calibrator.
Heritagedave posted a topic in 2014 - 2018 Chevy Silverado & GMC SierraNeed Help; My New 2018 Chevy 1500 4x4 with only 1800 mils speed control does not work at highway speeds, only at lower speeds below 40 mph. Once it gets above 40 mph the speed control shuts off, the on light stays on but the speed control will not engage. Once I get below 40 mph the speed control will start working again. Existing condition of the Truck; I bought the truck brand new off a Chevy dealer which already had a 6" Pro-Comp Lift and with 35"x 12.5"x 20" tires/rims installed on it. The Chevy dealer had a company call DSI install all their lifts on their new trucks. DSI also installed an Hypertech inline speedometer Calibrator. I was told that the truck is covered under the chevy standard warranty and DSI covers anything that Chevy will not. [This is also in writing] After I bought the truck I took it to a local well known 4x4 off road shop and had them replace the stock 3.42 gears with Chevy 4.10 gears. The truck runs great ! The only issue is that my speed control is not working at highway speeds. I did take the truck to another local Chevy dealer that's closer to where I live, to make a long story short they did try to diagnose the problem but could not find anything. All they could say is that it might have been something to do with the lift kit or the gear change and I should bring it back to the dealer whom I bought it from which I have already schedule an appointment. DSI did remove the Hypertech inline speedometer Calibrator but made no different. Has anybody else had this issue with there truck? If you have and you had if fixed what was the problem. Thanks, Dave -
Good catch - You got me thinking so I called my Mechanic and asked him why the different gears between the front and back axles [4.10\4.11]. I was told that our Chevy trucks front and rear axles are made from different company's. My rear axle is a 9.5" Dana and the front is made by another company which I cant seem to remember their name right now but it's a 8.5" axle, because of this Dana makes a 4.10 gear for their 9.5" axle and the other axle manufacture because it's a 8.5" axle the company makes a 4.10 gear for it. This being said the bottom line is that it's less than 1% different between the 4.10 and the 4.11 gear and it will not affect the driving ability or cause any issues with the moving parts within the drive line. Hope this helps -
Good question, I'm not a 100% sure but this practice has been going on for years. I always assumed it was to keep the front wheels to have the ability to turn/pull ahead of the rear wells ever so slightly otherwise the rear drive could push the truck straight if the truck weight transfer to the rear of the truck while off roading. Like I said though I’m not 100% sure.
I wish I was able to say that I did it my self but I dint. I used a well known shop in my area. It cost me $1600 including parts and Labor [both ends]. I won't think just because you have 3.08 gears would change much. I will add this info to my original post. Thank you for the kind words -
I feel that 4.10 would be a great choice and you will feel a huge different in toque/power and it would leave you room to move up to 35" tires at a later date if you wanted to. Bottom line is what will you really use the truck for.
Because of all the conversation on Differential Gear selections I decide to share what I ended up using on my truck and why, hopping this will help the next person trying to make this decision; My truck is a 2018 4x4 Crew Cab, 5.3 engine, 6 speed auto and came with 3.42 gears. I installed a Pro-Comp 6" lift, 20" rims with 35" Tires [Tire actual diameter is 34"] I used the Hypertech's In-Line Speedometer Calibrator Module [7301Speedometer Calibrators Inline - Part #73012727] to correct my speedo, FYI - Working great and easy to use. I decided to go with 4.10 gears in the rear and 4.11 in the front. The truck is running great with all the power and towing capacity I need [Ski Boat]. I use my truck for weekend runabouts and to get up to Tahoe and Arnold Ca. during the winter months. I have no issues with stop light take offs or highway driving. For me it was the best all-around choice. There are a couple of reasons why I deiced to go with the 4.10 gears. 1] I was able to use OEM parts/gears, Chevy does make 4.10 gears for our trucks. 2] I did not have to change out any other parts within my differential for the 4.10 gears swap. 3] The 4.10 gears [with the 6sp auto] puts my engine RPM where I wanted them [70mph in OD 2000-RPM's & 5th gear at 2400 RPM +/-] I had another 4x4 with 35" tire and 4.55 gears and the truck ran great as well but I did spin the engine up a little more. If I was using my truck for towing a larger trailer or doing a lot of off road driving or running bigger tires I would have gone with the 4.55 gears instead. Be honest with your self on how you will really going to use your truck, then you will be able to make the right gears selection for your self. Have Fun -
Most OnlineNewest Member
Who's Online 58 Members, 0 Anonymous, 539 Guests (See full list)
- Ben Bassinger