and their additive and still have chatter. I'm pleased with their regular oil, but the gear oil leaves much to be desired. I'll try royal purple next.
Rear Diff. Fluid
Thread Starter
|
Junior User
Joined: Apr 2004
Posts: 83
Likes: 0
From: Williamsburg, VA
Rear Diff. Fluid
I am going to change out the rear diff. fluid in my X next weekend. I don't do alot of towing but some. Its gonna be expensive. Has anyone used walmart's Super-Tech fully synthetic 75W-140? Its a GL-5 application grade. Motorcraft synthetic 75W-140 is $20/quart. Valvoline Synpower is $15/quart. Super-tech is $8/quart. The rear end takes 4 quarts plus the friction modifer. Thats $90 for a Motorcraft job or $40 for a Super-Tech job.
What do you'all think?
What do you'all think?
Junior User
Joined: Apr 2004
Posts: 95
Likes: 0
Just did this in my 2000 X and was told that I HAD to use the Motorcraft stuff @ $20.00/qt. I even added some limited slip additive too. I paid a mechanic to do this and am glad I did as he didn't get the seal tight and it leaked so he had to buy round two of the fluids! Good luck and if you decide to try anything other than motorcraft please post your result of happiness here so we all can learn from it.
Kevin
Kevin
Thread Starter
|
Junior User
Joined: Apr 2004
Posts: 83
Likes: 0
From: Williamsburg, VA
I bought the Valvoline Synpower Fully Synthetic 75w-140 from Advance. I had some heartburn with regards to buying the Super-tech for $8/quart. I just couldn't do it. A mechanic friend said "oil that thick, any brand would be ok". I disagree. There is a reason its $8/quart and everyone elses is $15 to $20/quart.
Junior User
Joined: Feb 2008
Posts: 66
Likes: 0
From: Belleville NJ
I am going to change out the rear diff. fluid in my X next weekend. I don't do alot of towing but some. Its gonna be expensive. Has anyone used walmart's Super-Tech fully synthetic 75W-140? Its a GL-5 application grade. Motorcraft synthetic 75W-140 is $20/quart. Valvoline Synpower is $15/quart. Super-tech is $8/quart. The rear end takes 4 quarts plus the friction modifer. Thats $90 for a Motorcraft job or $40 for a Super-Tech job.
What do you'all think?
What do you'all think?
The way I see it, I can do super-tech once per year, or the motorcraft at double the price and do it once every other year. My labor is free, well not free but I like to work on my x. The oil at the end of 2 years will costs me to same but even if the motocraft oil is better (I assume because of $) I just don't see it that much better at the end of 2nd year vs super-tech's once per year.
More Turbo
Joined: Jun 2004
Posts: 634
Likes: 8
From: Southern Tier New York
BTW... Did you notice that the OP was in May of 2004?
Trending Topics
Junior User
Joined: Feb 2008
Posts: 66
Likes: 0
From: Belleville NJ
Yes I understand changing out the rear diff once per year syn or dino is an over kill. I don't know if it is because I like to do everything at the same time so I don't have to keep a log of when and what i did. I firgue I am under the truck and getting dirty anyway why not just do everything and forget about it.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Senior User
Joined: Oct 2006
Posts: 405
Likes: 0
From: Bremerton, Wa.
It seems to me that the OP doesn't matter as I was just getting ready to do the same thing and there is a thread about a whole bunch of work someone else is doing on his rig and that's part of it.. If I remember correctly I used Mobil synthetic on my '98 3/4 Suburban and it has the anti-chatter stuff right in it,no additive needed, and it worked great and I was pulling an 8500# travel trailer with for awhile..Never seemed to have a bit of trouble or noise. Put it in both the front and rear.Had a leak in the rear cover,so pulled it,cleaned them out, redid the gaskets in both and filled them with fluid..Really easy job,just takes a bit of time is all.
Elder User
Joined: Oct 2007
Posts: 783
Likes: 0
From: Nova Scotia
Just did mine with Royal Purple a month or so back. It was $12.50 a quart and has the friction modifier already in it. After about a week of regular driving the chatter I had went away.
As a side note, I don't know if it's related to the rearend oil change, but my rear pinion seal started leaking shortly after. Got it changed out and topped off with the remaining Purple oil I had left from the original change.
As a side note, I don't know if it's related to the rearend oil change, but my rear pinion seal started leaking shortly after. Got it changed out and topped off with the remaining Purple oil I had left from the original change.
Post Fiend
Joined: Sep 2005
Posts: 5,955
Likes: 9
From: Ohio
Just did mine with Royal Purple a month or so back. It was $12.50 a quart and has the friction modifier already in it. After about a week of regular driving the chatter I had went away.
As a side note, I don't know if it's related to the rearend oil change, but my rear pinion seal started leaking shortly after. Got it changed out and topped off with the remaining Purple oil I had left from the original change.
As a side note, I don't know if it's related to the rearend oil change, but my rear pinion seal started leaking shortly after. Got it changed out and topped off with the remaining Purple oil I had left from the original change.
Elder User
Joined: Feb 2004
Posts: 517
Likes: 0
From: Texas
I nly run Royal Purple in all the fluids in the X and love it. I don't get any nose from the front or rear diffs. I also noticed a lower trans fluid temp after I replaced the trans oil.
I swear by it and we will turn over 200,000 miles this summer or sooner.
Bryan
I swear by it and we will turn over 200,000 miles this summer or sooner.
Bryan
Elder User
Joined: Feb 2004
Posts: 517
Likes: 0
From: Texas
Bryan