Rear end temperature
03-20-2012, 06:25 AM
#13
Mark
iTrader: (1)
and pull the cover this time and clean it out right !!! and don't forget friction modifier if you have a limited slip rear end...
10-08-2014, 06:29 PM
#15
quote from lucas oil website
"I wanted to give you this information about testing at Nashville last weekend. We ran the 75/90 Synthetic ger lube in the rear gear and transmission with 10% Lucas Synthetic Stabilizer mixed in.
On the long test runs (over 15 laps), we swaw 165 degree rear gear temperatures and 185 degree transmission temperatures. This is about a 15% reduction in heat from the previous numbers we have seen in 2003 when we ran other brands of oil."
Thanks
Bill Gerhart
Pennsylvania
Read Less
On the long test runs (over 15 laps), we swaw 165 degree rear gear temperatures and 185 degree transmission temperatures. This is about a 15% reduction in heat from the previous numbers we have seen in 2003 when we ran other brands of oil."
Thanks
Bill Gerhart
Pennsylvania
Read Less
10-08-2014, 08:03 PM
#16
I had leaky output shaft seals and when I finally blew at 49k I went with the 75/140. I'm at 130k now and the leaks have completely stopped. Seems as if the 75/90 is a just a fleet fuel economy gimmick. 75/140 is definitely the route to go on rear end.
don't be worried break it in! lol
10-09-2014, 04:52 PM
#19
Senior Member
Join Date: Sep 2008
Location: KC Metro-Missouri-formerly WI
Posts: 281
Likes: 0
Received 16 Likes
on
15 Posts
Changed mine @ 30K-Glad I did
I have a 3.73 LS axle. It was getting just a tad noisy on turns, so changed to Mobil 1 75W-140 and added the Ford Friction Modifer. Runs very quiet now and I can feel the difference in the LS when I do occassionaly have to engage it. Ford recommends change @ 30K for heavy duty usage (trailer-towing) which I do. 