Jump to content

  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Regearing for 35s with 8 speed

Justin88
 Share

Recommended Posts

Justin88 New Member

Justin88

Posted
Posted

I have 2018 Silverado LTZ Z71 with the 8 speed transmission and running a 3 inch level kit on 35s. Stock gearing is 3.42 and looking to regear the front and rear diffs. Since I went 35s I can feel the difference in how it drives and MPG. I’ve  talked to many people and some say 4.56 and others say 4.10 since it’s an 8 speed transmission.  I’ve read many forum threads but never one specifying gearing and how it’s different with an 8speed. Most are talking about 6 speed. Does anyone here have this set up and what gearing are you running or do you recommend ? Thanks in advance. 

Link to comment
Share on other sites
lucas287 Enthusiast

lucas287

Posted
Posted

4.56 all the way with 35s. The problem is I don't think they are made for the 9.5/9.76" AAM axle. Largest is 3.90/4.10 I believe. Maybe even 3.73.  

Link to comment
Share on other sites
pokismoki Senior Enthusiast

pokismoki

Posted
Posted (edited)

why do you need to go 35"?   not to be too logical  i'm guessing you where at 33" stock,  are you driving in lots of snow or sand trails? or do you need the extra ground clearance of the 35" to clear rocks?

 

the 8 speed has lower gearing built into it, for more torque vs the 6 speed. so 3.73 WorkTruck gear set will probably be all you need

 to buy from GM dealer

if you dont need the extra ground clearance I would go 33" on a 12-12.5" wide tire for the extra surface area , then air down to 20psi, this should handle everything a 35" can at 35-37 psi... but you benefit from less rotating inertia of the 33" tire.  and not have to spend $$$ to re-gear it either.

Edited by pokismoki
  • Like 1
Link to comment
Share on other sites
lucas287 Enthusiast

lucas287

Posted
Posted

@Justin88 or you could save the money on the re-gear and put it towards a blower. That torque would 'almost' solve your problem. 8th gear would still be useless under 75 MPH IMO. I have 32" tires, 6.2/8 speed and 3.23s - and I'm not too fond of 8th gear. It puts it in a load range that's sensitive to KR at such low RPM.  

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing

  • Similar Content

    • Brad Ashley
      08 Chevy 1500 Motor Rebuilt Completely
      By Brad Ashley
      I had the original motor completely rebuilt and when put back into my truck it will start and run but once you shut it off it will only crank but not start. Usually a hour later it will start again. . Any help I would appreciate it. 

    • Nobody-117
      Tune for 2015 5.3L 2015 Silverado
      By Nobody-117
      My warranty recently expired on my 2015 Chevy Silverado 1500 5.3L and I was wondering if anyone could recommend a tuner for my year truck. I drive about a 100 miles a day at time and would like to get a little more mpg. I have access to 93 in my area as well.
       
      Any help is appreciated. 
    • TLalli
      2021 Silverado High Country 4WD 5.3L Lifters
      By TLalli
      I purchased a 2021 Silverado Crew Cab High Country 4WD about 4 months ago from Watson Chevrolet in Tucson Arizona. Within week of driving the truck I began noticing some pretty strange sporadic things happening. I started video taping the issues when I could to document what was happening.  Ticking noise coming from the engine when cold starting, sporadically have hourglass on stereo saying “loading” it would continue until the engine was turned off and back on then it was OK. “Park Assist” Error message sporadically popping up while driving down the road, Horn honking (three short honks) for no reason while sitting in traffic at a red light. At 900 miles I reached out to the dealer and told them these concerns and issues I was experiencing. The service manager explain to me “the truck has a lot of technology and it just needs to learn your driving habits, you just need to keep driving it”
      At 11,000 and 3 months after purchasing I get the loud lifter noise, “Service parking brake”message, “steering assist reduced” message, “Service ESC light” and “check engine light” I drove it into the other dealership located in Tucson (O’Reilly Chevrolet), they keep the truck for about three weeks and “replace lifters on one bank and 1 bent push rod” and tell me that they couldn’t duplicate any of the other issues however they did a firmware upgrade and everything should be fine. One week after getting the truck back (11500 miles) I get another check engine light, Keep in mind I can still hear the lifters ticking when starting it first thing in the morning. I take back to the dealer after a week of a being in the shop, They tell me “The check engine light was because there was multiple cylinder misfire and it was the opposite bank from the lifters they replaced” however they can’t duplicate the problem so there’s nothing they can do. They admitted that the computer had logged over 200 misfires on one cylinder and that’s what made the check engine light turned on, then they go on to tell me they can’t duplicate the problem so there’s nothing they can do. I asked them about the ticking noise when starting and the tell me “that’s normal, it’s not lifter noise you’re hearing, it’s the new technology fuel pumps GM is using that’s making that noise” 
       
      Other issue I have had is the rotors on all four wheels at times will turn blue and discolored as if the brakes and her have been completely overheated. But it’s not the entire rotor It’s only the center inch of all rotors. The inside edge and outside edges look normal. 
       
      I have a purchased over 11 band new (Ford, Chevy, Dodge, Toyota) Trucks in the past 30 years this is by far the worst freaking vehicle I have ever purchased.
    • Addison Lesinski
      14-18 Silverado chrome Front/Rear bumper/Grille (like new). I’m looking to trade for black painted bumpers/grille.
      By Addison Lesinski
      I’m located in Dallas,TX. As the title states looking to trade my chrome front/rear bumpers and grille for the black painted versions. Text me at 469-888-0122
    • Nobody-117
      Check engine light code P0446 EVAP
      By Nobody-117
      I have a 2015 Silverado with a 5.3L which has about 42k miles on it. Recently I had the brake booster replaced due to oil getting within the booster. I am not sure if the P0446 code was casued by the replacement of the booster. I was recently driving around town after the brake booster was repaced and my truck threw the P0446 check engine light code. I have done some research and some people say to just replace the gas cap and that should fix it where others says they have had to replace the EVAP purge selonoids. I plan on calling the dealership where I had the brake booster replaced at first thing monday morning in order to get their opinion and a preliminary cost on troubleshooting but just trying to get an understanding before I call. I don't really want the wool to be pulled over my eyes.
       
      Any help is appreciated.

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    242k
    Total Topics
    1.4m
    Total Posts

  • Member Statistics

    309,050
    Total Members
    8,960
    Most Online
    Robert Wancz
    Newest Member
    Robert Wancz
    Joined


×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.

  I accept