Rear end grinding noise...thanks jiffy lube
05-10-2012, 08:53 AM
#1
1st Gear Member
Thread Starter
Join Date: Sep 2011
Location: WA
Posts: 69
Rear end grinding noise...thanks jiffy lube
So i am currently locally deployed doing a training mission. I brought my 66 mustang. I knew i needed and oil change and haven't had time at home so i figured i would just have it done during my trip. I have the 5.0 and T-5 from an 87 mustang in it. The guy checked the rear differential fluid and said it was bad. He drained and refilled. No metal chunks but a bunch of filings. He said he replaced it with 75-90 synthetic. Now i have a grinding at low speeds while turning.........what the F! How do i fix this? Is this somehow Jiffy Lubes fault?
05-10-2012, 10:41 AM
#4
2nd Gear Member
Join Date: Mar 2012
Location: Texas
Posts: 228
If you have posi then more than likely it needs friction modifier added to the gear oil. Go to your local ford dealers parts desk and they should have it on stock. Its a very common issue with these quick change places as they dont carry friction modifiers. Their books only show what filters to use, what oils etc.
05-10-2012, 04:43 PM
#5
3rd Gear Member
Join Date: Nov 2006
Location: PA
Posts: 823
Fords term is "limited slip differential"... if you have one of these, you need to add friction modifier to the gear lube. If you already have clutch pack chatter, it may be too late... best thing to do is add the modifier and hope it takes care of the problem, if it doesn't, you need to have the lube shop cover the cost of a clutch pack replacement since it was their fault.
Last edited by capri debris; 05-12-2012 at 11:18 PM.
05-10-2012, 05:33 PM
#6
Join Date: Mar 2007
Posts: 42
I know nothing about your problem, but I do know JL stood behind an engine they neglected to tighten the oil filter on for me once. Blew all to pieces!
They need to be aware of the issue ASAP. In my case they sent out an inspector to make a judgement.
BTW that was the last time I ever used them.
They need to be aware of the issue ASAP. In my case they sent out an inspector to make a judgement.
BTW that was the last time I ever used them.
07-07-2012, 12:23 PM
#8
1st Gear Member
Thread Starter
Join Date: Sep 2011
Location: WA
Posts: 69
So i went to jiffy lube and the put the friction modifier in. I drove it a little but haven't had the chance to really go to a parking lot and do figure 8's. On the way home i noticed it doesn't grind when turning left....only when turning right at low speeds. So what do i do? Is it still the differential just the lube hasn't worked it's way in....or is it something bigger?
07-07-2012, 11:05 PM
#10
1st Gear Member
Thread Starter
Join Date: Sep 2011
Location: WA
Posts: 69
they said they would check it to see if it was in good condition. It was dark and had some metal flakes so they suggested to flush it. I said okay.....hindsight.....get some jack stands......just do stuff myself.....using this webise for help.