Diff Oil change, how often?
Thread Starter
Burning Brakes
Joined: Jul 2003
Posts: 760
Likes: 0
From: vancouver bc
Diff Oil change, how often?
So I clicked over the 100,000 mile marker a couple weeks ago and I got thinking, I've never had the diff oil or tranny fluid changed. I'm sure these need to be done, but I was just wondering how often they should be changed on our cars? I have a 97 MN6.
Instructor
Joined: May 2005
Posts: 145
Likes: 0
From: Nevada Texas
seals
When tha axle seals leak bad enough to tick ya off. I changed mine @ 210,000
Racer
Joined: Nov 2006
Posts: 264
Likes: 8
From: Centre, AL
Its pretty easy to do. Hmmm....lets say every 2 years or 20,000 miles. Yup..that should do it. The fluid does get hot and breaks down. Do it now, and every few years. Get a set of ramps, you can do it yourself pretty easily. My shifting really improved when I changed the tranny fluid.
Last edited by waterzap; Aug 17, 2007 at 09:42 PM.
Racer
Joined: Sep 2006
Posts: 280
Likes: 0
Its pretty easy to do. Hmmm....lets say every 2 years or 20,000 miles. Yup..that should do it. The fluid does get hot and breaks down. Do it now, and every few years. Get a set of ramps, you can do it yourself pretty easily. My shifting really improved when I changed the tranny fluid.
I change both diff & tranny at 15 - 20K ...... to me it's cheap insurance given that the car is driven daily, often in stop and go traffic.
Melting Slicks
Joined: Jul 2005
Posts: 2,572
Likes: 3
From: Rehoboth MA . . . NRA Life Member
St. Jude Donor '06-'07
Get the car up high enough so you have access to both transmission and differential.
The differential has 2 10mm hex plugs, one for draining, I believe it's on the passenger side at the low point. The fill plug is on the rear of the differential facing the back of the car.
Use the same method, drain then fill. The Differential takes 2 quarts of fluid.
While you're under there service them both. I use Royal Purple products, see my signature below....
The differential has 2 10mm hex plugs, one for draining, I believe it's on the passenger side at the low point. The fill plug is on the rear of the differential facing the back of the car.
Use the same method, drain then fill. The Differential takes 2 quarts of fluid.
While you're under there service them both. I use Royal Purple products, see my signature below....
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Thread Starter
Burning Brakes
Joined: Jul 2003
Posts: 760
Likes: 0
From: vancouver bc
Get the car up high enough so you have access to both transmission and differential.
The differential has 2 10mm hex plugs, one for draining, I believe it's on the passenger side at the low point. The fill plug is on the rear of the differential facing the back of the car.
Use the same method, drain then fill. The Differential takes 2 quarts of fluid.
While you're under there service them both. I use Royal Purple products, see my signature below....
The differential has 2 10mm hex plugs, one for draining, I believe it's on the passenger side at the low point. The fill plug is on the rear of the differential facing the back of the car.
Use the same method, drain then fill. The Differential takes 2 quarts of fluid.
While you're under there service them both. I use Royal Purple products, see my signature below....
. Sounds easy enough to do.
Le Mans Master
Joined: Feb 2002
Posts: 6,937
Likes: 21
From: Waldorf MD
My MN6 transmission needs synthetic fluid changed every 50,000 miles. Last time it ground going into 6th gear, changed fluid and fixed that.
I have never changed differential fluid, and am at 106,000 miles.
I have never changed differential fluid, and am at 106,000 miles.
Le Mans Master
Joined: Nov 2003
Posts: 8,004
Likes: 250
From: Tampa Fl
St. Jude Donor '12-'13-'14
I changed my differantal fluid a couple months ago after putting on 1000 miles on my 3.90s. Itwas so easy a cavemen could do it 
I have my tranny fluid changed when the clutch was being replaced the 2nd time. I asked the Mark the mechanic as ECS who was replacing my clutch and he said it depends on how much I liked my car. I told him since he was installing the 2nd new clutch in 3 months, I really dont like the car now, but change the fuild anyway. It was right there and easy to do.
I wont change them again for another 5 years or 25,000 miles. Which ever comes first. I put on about 3000 miles a year. The car is 7 1/2 years old and has 23000 miles. I change the cam more than anything else.
I have my tranny fluid changed when the clutch was being replaced the 2nd time. I asked the Mark the mechanic as ECS who was replacing my clutch and he said it depends on how much I liked my car. I told him since he was installing the 2nd new clutch in 3 months, I really dont like the car now, but change the fuild anyway. It was right there and easy to do.
I wont change them again for another 5 years or 25,000 miles. Which ever comes first. I put on about 3000 miles a year. The car is 7 1/2 years old and has 23000 miles. I change the cam more than anything else.
