pjfsail
Active Member
- Joined
- September 26, 2014
- Messages
- 52
- Reaction score
- 6
- Location
- High Desert, Southern California
- Year, Model & Trim Level
- 2000 Mercury Mountaineer
Hi, my name is Peter I spent the first part of my mechanical career as a Heavy Duty Mechanic focusing my attention on earth moving equipment. I worked my way up through the traditional ranks working on every piece of equipment that would appear on a normal dam building job site, Interstate Highway build or in the shop. I eventually worked for a Caterpillar Tractor Dealer as a Field Service Mechanic. I didn't spend much time working on cars or pickup trucks. So, when I work on one of my vehicles I transfer my skills. In regards to automobiles I ask lots of questions. So, here goes with 2 questions.
I recently bought a 2000 Mountaineer (Love it) with 200,000 miles on the clock. The SUV that the Mountaineer replaced was a 1987 Toyota 4Runner with over 300,000 miles. There are very few problems with the Mountaineer but I am concerned about a WHINE ON ACCELERATION and quiet as a mouse on deceleration. So, I decided to drain oils and replace them as a starting point. I drained the TRANSFER CASE and noticed that it was overfull, the oil was black, but did not smell bad. I drained the REAR DIFFERENTIAL, the oil looked ok, did not smell bad so I cleaned up the nasty stuff on the inside of the cover, with a long screw driver I poked around looking at backlash and seeing if anything appeared to be problematic, didn't see anything wrong.
I'm ready to replace the oils. The tag on the differential says to use ONLY 85 -140 SYNTHETIC. I have read to disregard this directive and to use 85 - 140 and add Ford's Friction Modifier. The other tag on the differential indicates it is a Limited Slip Differential. Of course, I want to add the correct oil but what is correct? I have two questions 1. What oil do I use? 2. Has anyone else experienced the whine on acceleration and what did you do about it?
I recently bought a 2000 Mountaineer (Love it) with 200,000 miles on the clock. The SUV that the Mountaineer replaced was a 1987 Toyota 4Runner with over 300,000 miles. There are very few problems with the Mountaineer but I am concerned about a WHINE ON ACCELERATION and quiet as a mouse on deceleration. So, I decided to drain oils and replace them as a starting point. I drained the TRANSFER CASE and noticed that it was overfull, the oil was black, but did not smell bad. I drained the REAR DIFFERENTIAL, the oil looked ok, did not smell bad so I cleaned up the nasty stuff on the inside of the cover, with a long screw driver I poked around looking at backlash and seeing if anything appeared to be problematic, didn't see anything wrong.
I'm ready to replace the oils. The tag on the differential says to use ONLY 85 -140 SYNTHETIC. I have read to disregard this directive and to use 85 - 140 and add Ford's Friction Modifier. The other tag on the differential indicates it is a Limited Slip Differential. Of course, I want to add the correct oil but what is correct? I have two questions 1. What oil do I use? 2. Has anyone else experienced the whine on acceleration and what did you do about it?