gear case lube
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Freshman User
Joined: Aug 2009
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gear case lube
Good morning SD owners,
Was wondering what you guys recomend using in the front and rear diffs on my 04 F250 6.0? I just turned 100k and would like to refresh both. I have heard that the front and rear take diferent lubricants. Is this true? I wouldn't mind running a synthtic lube if I can. Also are there gaskets on the covers? Reuseable? Also what are the capacities of each? Any and all info would be great.
Was wondering what you guys recomend using in the front and rear diffs on my 04 F250 6.0? I just turned 100k and would like to refresh both. I have heard that the front and rear take diferent lubricants. Is this true? I wouldn't mind running a synthtic lube if I can. Also are there gaskets on the covers? Reuseable? Also what are the capacities of each? Any and all info would be great.
Fleet Mechanic
Joined: Jun 2006
Posts: 1,589
Likes: 20
I'm doing this from memory so you should check your owners manual. I believe the OEM gear oil is synthetic for both diffs.
I use Royal Purple Synthetic lubricants in everything on my X.
I did not add the little 4 oz. bottle of limited slip diff lubricant since Royal Purple said it was not necessary with synthetic gear oil.
Rear Diff - 75W-140 gear oil - approximately 3 quarts
Front Diff - 75W-90 gear oil - approximately 3 quarts
Rear diff cover has non reusable gasket. Don't know what front diff has. When I initially changed my rear diff oil, I used the black gasket maker sealer from Permetex. Good stuff and, if applied properly, will not leak.
DSMMH
I use Royal Purple Synthetic lubricants in everything on my X.
I did not add the little 4 oz. bottle of limited slip diff lubricant since Royal Purple said it was not necessary with synthetic gear oil.
Rear Diff - 75W-140 gear oil - approximately 3 quarts
Front Diff - 75W-90 gear oil - approximately 3 quarts
Rear diff cover has non reusable gasket. Don't know what front diff has. When I initially changed my rear diff oil, I used the black gasket maker sealer from Permetex. Good stuff and, if applied properly, will not leak.
DSMMH
Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
I'm doing this from memory so you should check your owners manual. I believe the OEM gear oil is synthetic for both diffs.
I use Royal Purple Synthetic lubricants in everything on my X.
I did not add the little 4 oz. bottle of limited slip diff lubricant since Royal Purple said it was not necessary with synthetic gear oil.
Rear Diff - 75W-140 gear oil - approximately 3 quarts
Front Diff - 75W-90 gear oil - approximately 3 quarts
Rear diff cover has non reusable gasket. Don't know what front diff has. When I initially changed my rear diff oil, I used the black gasket maker sealer from Permetex. Good stuff and, if applied properly, will not leak.
DSMMH
I use Royal Purple Synthetic lubricants in everything on my X.
I did not add the little 4 oz. bottle of limited slip diff lubricant since Royal Purple said it was not necessary with synthetic gear oil.
Rear Diff - 75W-140 gear oil - approximately 3 quarts
Front Diff - 75W-90 gear oil - approximately 3 quarts
Rear diff cover has non reusable gasket. Don't know what front diff has. When I initially changed my rear diff oil, I used the black gasket maker sealer from Permetex. Good stuff and, if applied properly, will not leak.
DSMMH
Fleet Mechanic
Joined: Feb 2007
Posts: 1,315
Likes: 9
From: Mid Atlantic
I just did this on my 350 below and used the appropriate Mobil 1 LS in each case. There are no gaskets so you will need the appropriate gasket material. I also replaced the rear end cover with the newer aluminum one from Ford that has fins on it to hopefully keep it cooler.
There are excellent write ups in the tech folder and here they are...
SRW rear diff
https://www.ford-trucks.com/lc/lc.ph...m%2Frdiff.html
Front diff
https://www.ford-trucks.com/lc/lc.ph...m%2Ffdiff.html
On a side note the rear fluid in mine looked like a milk shake but the front looked almost new.
Also, I just did a 375 mile run down to the beach and got my best mileage to date (20.4 hand calculated!!!)
There are excellent write ups in the tech folder and here they are...
SRW rear diff
https://www.ford-trucks.com/lc/lc.ph...m%2Frdiff.html
Front diff
https://www.ford-trucks.com/lc/lc.ph...m%2Ffdiff.html
On a side note the rear fluid in mine looked like a milk shake but the front looked almost new.
Also, I just did a 375 mile run down to the beach and got my best mileage to date (20.4 hand calculated!!!)
Posting Guru
Joined: Feb 2009
Posts: 1,170
Likes: 1
From: Moyock, NC
What they said...excellent input. I too used the '08 rear diff cover $45...worth the extra 20'F cooler temps than I had before...although some of that could be due to the gear lube changed as well. Went with Mobil1...as I do in almost any lubricating application in my garage. Pick up a couple of 5/16 x 18 studs (or make a couple by grinding off the bolts heads)...they came in pretty handing while lining up the bolt holes. I never let the Ultra Black gasket maker skin over....just made sure the new cover was warmed up first....I also used allen head screws with external lock washers...looks pretty clean this way. I also only torqued to 200 in lb, due to the new cover being cast alluminum.
Fleet Mechanic
Joined: Jun 2006
Posts: 1,589
Likes: 20
Yeah, I just installed the MAG-HYTECH rear diff cover that increases the gear oil capacity from 3 quarts to 6 quarts. Has drain plug, dip stick, new stainless allen head bolts and imbedded "O" ring seal. A bit pricey ($245) but well worth the piece of mind and additional cooling when towing.
I'm going to get the Mag-Hytech front cover and install since I have never had the front diff cover off to see what things look like.
DSMMH
I'm going to get the Mag-Hytech front cover and install since I have never had the front diff cover off to see what things look like.
DSMMH
Fleet Mechanic
Joined: Feb 2007
Posts: 1,315
Likes: 9
From: Mid Atlantic
^^^
Yeah I looked long and hard at that. It sure is purdy as they say but I could not justify the upcharge. Hopefully I'll be alright.
If you intend to keep your truck for 250K I think the price would be justified
Yeah I looked long and hard at that. It sure is purdy as they say but I could not justify the upcharge. Hopefully I'll be alright.
If you intend to keep your truck for 250K I think the price would be justified
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