What trany/rear end oil should I use in 2006 chevy

[ram1067]

My 06 chevy crew 5.3 z71 w/locking diff. has 60k on it.....I'm thinking it might be time to think about changing all fluids....rear end, trans, & FT transfer

 

What should i use?

THX

[00Silverado4x4]

I just did the rear axle yesterday. I used 75w-90 synthetic blend from Walmart. Not sure if the blend is good stuff or not, also have the G80. As far the the front mine takes 80w-90 conventional gear oil, trying to get that done today. I have the autotrac so I need the blue autotrac fluid. Haven't bought the fluid yet for that. Hope that helps you out.

[txab]

Synthetic 75w-90 in both diffs will be fine. Dexron VI in trans.

[gmtech4]

or check your owners manual ,

 

good info in there.....no guessing or internet required lol

[Stevens03]

Synthetic 75w-90 in both diffs will be fine.

 

I can tell you from my personal experience, full synthetic ATF in your transmission will decrease the operating temps, cause the shifts to be smooth, quick and concise. I got a solid 1-2mpg better after the swap to full synthetic ATF.

[Black02Silverado]

Everyone pretty much covered it. You can run 75w-90 in the front with no issues, you don't have to run the 80w-90. The fact that you live in Mich will help in the colder temps especially when you get those below zero readings.

[RockySierra]

Always good to ask like the original poster has, the information in the owners manual does go out of date sooner or later as better fluids and products come out.

[ram1067]

Hey thanks to everyone!!

 

Now w/60k on the truck should i change them or give it another 10/20 thousand before doing it??? keep in mind i only tow a travel trailer (24') and a 2 place snowmobile trailer

few times a yr. no real abuce just daliy driver.

 

Also what about the additive i've read about , thats needed for rear ends w/locking diff?????

[ChevyTech77]

NO ADDITIVES FOR THE G-80 GM LOCKING DIFFS!!!! So make sure whichever diff fluid you go with doesn't already have the limited slip diff additive/friction modifiers in it because most do.

 

I always recommend to do all diffs, t-case and trans at 50k minimum with similar usage as yours. It's piece of mind if nothing else. May want to take a close look at your brake fluid as well. Black = flush time and Clear = good to go.

[music]

Here's a prior discussion on this: http://www.gm-trucks...ic=132120&st=30 . I posted a couple of entries on that page for what I did earlier this year... just FYI. I used Valvoline Synpower 75w90 full syn in both front and rear, and did *not* add friction modifier. Four (4) quarts worked out perfectly between the two. I have since towed the camper (~7k lbs) over 5000 miles, and driven it daily. The G80 works great, no issues. I found the Valvoline fluid at Napa, and bought the gasket from the GM dealer.