Transmission, Transfercase, Differentials - Fluids
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Transmission, Transfercase, Differentials - Fluids
Before I get flamed for starting a new thread, let me preface by saying that:
1: I did a search. ended up with more questions than answers
2: I bought a haynes manual, and I do not believe what I am reading...
so I am here to ask for confirmation.
I have a 1990 f250 4x4 with a 460ci engine and a 5 speed transmission
axle code is 39, non-posi 3.55:1 ratio
I'm in the process of doing complete fluid changes (just bought this truck), trying to tackle the front and rear differentials, transfercase, and transmission
forum search said to use 75w140 synthetic in the differentials... haynes manual says hypoid gear lubricant...
haynes manual says to use MERCON in both the transmission and transfercase... can anyone confirm this? I have a hard time believing that a manual transmission takes mercon...
so what should I put in my
differentials:
transmission:
transfercase:
???
I've got 75w90 redline synthetic, and dino 80w90 on the shelf, do I really need to go buy mercon?!?
Thank you so much!
1: I did a search. ended up with more questions than answers
2: I bought a haynes manual, and I do not believe what I am reading...
so I am here to ask for confirmation.
I have a 1990 f250 4x4 with a 460ci engine and a 5 speed transmission
axle code is 39, non-posi 3.55:1 ratio
I'm in the process of doing complete fluid changes (just bought this truck), trying to tackle the front and rear differentials, transfercase, and transmission
forum search said to use 75w140 synthetic in the differentials... haynes manual says hypoid gear lubricant...
haynes manual says to use MERCON in both the transmission and transfercase... can anyone confirm this? I have a hard time believing that a manual transmission takes mercon...
so what should I put in my
differentials:
transmission:
transfercase:
???
I've got 75w90 redline synthetic, and dino 80w90 on the shelf, do I really need to go buy mercon?!?
Thank you so much!
Senior User
Joined: May 2005
Posts: 326
Likes: 1
From: Carthage, MO
We just went through this over in the Ranger section not too long ago. Check it out, lots of good info.
https://www.ford-trucks.com/forums/9...speed-2wd.html
https://www.ford-trucks.com/forums/9...speed-2wd.html
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New User
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so it sounds like i'll be running mercon V in the transmission and transfer case, and 75w90 synthetic in the differentials, being that they are both open diffs, non-posi.
Thanks so much for the input / advice! Guess I'll have to drain the 80w90 out've my transfer case! lol
Thanks so much for the input / advice! Guess I'll have to drain the 80w90 out've my transfer case! lol
Posting Guru
Joined: Nov 2008
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From: Pennsylvania Wilds
so it sounds like i'll be running mercon V in the transmission and transfer case, and 75w90 synthetic in the differentials, being that they are both open diffs, non-posi.
Thanks so much for the input / advice! Guess I'll have to drain the 80w90 out've my transfer case! lol
Thanks so much for the input / advice! Guess I'll have to drain the 80w90 out've my transfer case! lol
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Paul Sheahan
1973 - 1979 F-100 & Larger F-Series Trucks
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Oct 30, 2016 06:05 PM
