Jump to content

Transfer case fluid change

Jeff Newell
 Share

Recommended Posts

Jeff Newell New Member

Jeff Newell

Posted
Posted

I have a 17 Silverado 1500 z71 that I bought used with 89k miles on it. Around 93k or so, the transmission had to be replaced. It now has almost 100k on it. I know the transfer case fluid is supposed to be changed around this time. 

 

My question is, what are the odds that they changed the transfer case fluid when they replaced the transmission? Or would it not be standard procedure to drop both at the same time. I've searched and have seen mixed opinions. The paperwork did not specify if it was done or not. 

diyer2 Senior Enthusiast

diyer2

Posted
Posted

Well,

I think if the trans had been serviced BEFORE the owners manual recommends(I do more fluid changes) you wouldn't have needed to replace it. So I bet the transfer case was never touched.

Jeff Newell New Member

Jeff Newell

Posted
  • Author
Posted

I agree as far as the trans goes. It was a risk of buying a used vehicle. Fortunately I had an extended warranty that covered it, otherwise I would have been real upset. 

 

Just trying to stay up to date with the maintenance now since I can only assume it wasn't fully taken care of before I bought it. 

rav3 Senior Enthusiast

rav3

Posted
Posted

If it were me, I'd go ahead & change it as it only holds about a quart or 2. Easy job.

  • Like 1
Z45 Senior Enthusiast

Z45

Posted
Posted (edited)

I would change it out. I would never trust the shop to be proactive, they likely did only what was necessary and used the lowest cost products in their repair. If you are of the believe all lubes are the same, then drive with confidence. 

Edited by elcamino
newdude Senior Enthusiast

newdude

Posted
Posted
On 7/17/2023 at 1:57 PM, Jeff Newell said:

I have a 17 Silverado 1500 z71 that I bought used with 89k miles on it. Around 93k or so, the transmission had to be replaced. It now has almost 100k on it. I know the transfer case fluid is supposed to be changed around this time. 

 

My question is, what are the odds that they changed the transfer case fluid when they replaced the transmission? Or would it not be standard procedure to drop both at the same time. I've searched and have seen mixed opinions. The paperwork did not specify if it was done or not. 

 

 

Unlikely.  Transfer case was probably removed with the fluid in it.  Its only 2 quarts in there so not a whole lot of extra weight.  

 

No more than ever 45k miles IMO for transfer case.  The book shows 97,500mi for "normal use" which is insane because the 2500/3500 chart shows every 45,000mi or for severe use every 22,500mi.  

  • Like 3
Jeff Newell New Member

Jeff Newell

Posted
  • Author
Posted

Yeah. Definitely going to change it. Just hoping no damage has been done. No idea how well it was maintained before I bought it. 

BigBlue2014 Enthusiast

BigBlue2014

Posted
Posted

For good measure, I would suggest replacing Front and rear diff as well as the transfer case. You will already be under the truck with the tools out, so what is an extra 30-45 min of time to have fresh fluid in everything?

  • Like 4
  • Thanks 1
Wyatt1963 Enthusiast

Wyatt1963

Posted
Posted

What’s the best fluid for front, rear differential and for transfer case? For 2015 Sierra 4x4

weight, brand etc..

I don’t get under the truck anymore so what’s a fair shop price for all?

thanks in advance 

rav3 Senior Enthusiast

rav3

Posted
Posted

I use a synthetic 75W90 limited slip GL5 gear oil in front & rear.  Walmart Super tech works & is a good cost effective  GL5.

Transfer case takes Dexron 6. I use AC Delco  for it but any Dexron 6 meets the spec.

  • Like 1
  • Thanks 1
HoosierZ Enthusiast

HoosierZ

Posted
Posted

I used Mobil 1 Delvac 75W90 in my diffs because it doesn’t contain limited slip additive. The additive isn’t recommended for the G80 locker. It took 4qts 12oz for both diffs. 
 

B1ABF76B-EA38-4C0A-93CB-5F44EF90C147.webp.09a714491c9d0182df317c0ceb4656f5.webp

  • Like 2
  • Thanks 1
BigBlue2014 Enthusiast

BigBlue2014

Posted
Posted
On 7/21/2023 at 7:11 PM, Wyatt1963 said:

What’s the best fluid for front, rear differential and for transfer case? For 2015 Sierra 4x4

weight, brand etc..

I don’t get under the truck anymore so what’s a fair shop price for all?

thanks in advance 

I used Amsoil Severe Gear 75W90 for the Front and rear Diffs in my 2014 and Amsoil Synthetic Trans oil for the transfer case.

  • Like 1
reardiff Enthusiast

reardiff

Posted
Posted
5 hours ago, BigBlue2014 said:

I used Amsoil Severe Gear 75W90 for the Front and rear Diffs in my 2014 and Amsoil Synthetic Trans oil for the transfer case.

 

Same here

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • KARNUT
      AFM Experience

      By KARNUT · Posted

      The problem with failure rates or increase failures are there’s people who don’t have a problem. What are you doing wrong they say. We had 4 5.7 GM diesel’s in the family when they came out. One was flawless. My uncle who happened to be the most abusive. Early rotary engines were known to use oil. I abused my first car so bad in six months I replaced the clutch, transmission and rear end. It didn’t use oil. My brother in law has a 2013 Tahoe and an older Yukon. The Yukon has 280K miles. The Tahoe around 175K. He runs them to about 300K. If his lifters fail before that time he would consider it a failure. My Hondas, I know people hate it when I mention them. Identical engines. One with cylinder deactivation one doesn’t have it. One shudders when the eco light goes on or off. Cylinder deactivation. But wait! According to the web. It can happen with lock up too. So now people in the know are changing the oil and transmission fluid more often. Then you read it could be a programing issue. So what do you do? There’s lots of money involved. I see three ways to deal with it. One only works if you don’t drive lots of miles. Lease, never get out of warranty. Or only buy older vehicles with a good track record. They all have bad runs. Usually when there’s a change. Even Toyota and Honda. 
    • Grumpy Bear
      AFM Experience

      By Grumpy Bear · Posted

      Question @diyer2 on this line if you please. Are you saying the shudder is the system turning on and off at the frequency of the shudder? Guess I'm asking if you are saying you have seen it do this with the bi-direction scan tool in graph mode? If so have you been able to discern the 'trigger'. Something is telling to cycle rapidly.    My truck just started doing this recently. 197K on the clock. My response has been M5 anything under 55 mph. I treat it like a lugging stick shift. Gear down and let it spin a bit. Engauge M5, then tow mode and then M6 lets the trans stay in 5th but the AFM is active. Smooth like Skippy.    My thought was that as a machine ages the friction gets lower and as the system is load based, the lower friction would allow it to turn on at ever lower rpm until it reaches the lugging point. And yes I am ignorant of any minimum rpm requirement for the system. If you know that would be useful information.    As you know I run a Scan-Gauge II which allows me to watch the On/Off of the signal to the VLOM. While in the shudder mode I'm not seeing is cycle at that frequency or at all for that matter outside the triggers @newdude posted a few years back. Now is it possible that the refresh rate isn't fast enough to catch it? Maybe. It is why I asked my first question about graphing and trigging parameter.     As we have observed from members here the failure point is all over the map miles wise as you note yourself in your opening post. That by itself begs a few questions like fellows that comment on these lifters failing even after the system has been disabled. Long after. 😬   https://www.enginelabs.com/news/tech-tips-replacing-ls-active-fuel-management-lifters-with-melling/   The Gen5 lifters operate the same as the LS versions. In fact they are the same lifter.    https://www.enginelabs.com/tech-stories/sorting-out-gen-v-lt-lifter-failure-with-a-simple-valvetrain-fix/        
    • SwitchBladeSierra
      14-18 Sierra 1500 Heated Steering Wheel Help

      By SwitchBladeSierra · Posted

      UPDATE 2: Steering wheel control backlights and control of the cluster can supposedly be achieved by adding a wire to pin 20 of the cluster and tapping it to pin 2 of the main clock spring harness. I'm going to give it a shot - will update  
    • newdude
      Seems to be Missing a lot of Updates

      By newdude · Posted

      GM Global A pickups 2019-2022 can do OTA programming for the radio.  GM VIP (GM Global B) can do OTAs for almost every module on board.  So a 2022.5 and newer pickup can do OTAs for recalls like the 2.7 fuel flow recall.  EVs get OTAs that improve one pedal driving, radio issues, HVAC issues, updated battery management software, etc.     So age of the vehicle/what GM electrical platform its on will alter what amount of updates can be pushed on OTAs.  
    • Blade8971
      Upgrade to a 2026 AT4 with the 3.0L Duramax

      By Blade8971 · Posted

      Thank You.   So far my new ride is making me look like a genius for going with the 3.0L, as my first fuel refill occurred over three weeks from when I took delivery.  This engine combination is very amazing.  So far no issues and had not done a regen yet.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...