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Old 07-04-2012, 02:27 AM   #1
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rearend oil???

When I get my 3.73 gears installed, what oil n weight should I use?
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Old 07-04-2012, 05:05 AM   #2
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Also thinking about draining my manual tranny and refilling it with a good quality gear oil. What weight should I use? It's a 91 mustang
5.0 H.O 5 speed.....
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Old 07-04-2012, 10:04 AM   #3
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Quote:
Originally Posted by fordracing63857
Also thinking about draining my manual tranny and refilling it with a good quality gear oil. What weight should I use? It's a 91 mustang
5.0 H.O 5 speed.....
Dont use gear oil , they stoped that years ago automatic trans fluid is what u want / need imo go royal purple
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Old 07-04-2012, 10:35 AM   #4
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Quote:
Originally Posted by intensive

Dont use gear oil , they stoped that years ago automatic trans fluid is what u want / need imo go royal purple
if its a non w/c then it will take gear oil.

---------- Post added at 10:35 AM ---------- Previous post was at 10:22 AM ----------

i dont remember what weight goes in the rear. it might be 70w. but the auto parts store should know. also dont forget to add 4oz of friction modifier
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Old 07-04-2012, 10:38 AM   #5
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I've always used 80 90w oil in all my vehicles axles
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Old 07-04-2012, 10:44 AM   #6
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I've always used 80 90w oil in all my vehicles axles
your probably right. its been a while since i put mine in. i usually ask the guy at the counter. lol
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Old 07-04-2012, 10:47 AM   #7
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I just know because I can't stand the smell of it especially if I get it on my hands lol
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Old 07-04-2012, 10:56 AM   #8
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I just know because I can't stand the smell of it especially if I get it on my hands lol
yes! my wife especialy hates it
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Old 07-04-2012, 11:01 AM   #9
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I used 75W-140 with the Ford friction modifier. I can't image it being different from 91 to 2004, but..?
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Old 07-04-2012, 11:13 AM   #10
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Originally Posted by Azure
I used 75W-140 with the Ford friction modifier. I can't image it being different from 91 to 2004, but..?
im not sure but its probably possible to be different. didnt they upgrade the clutches in the rear at one time? not sure though

---------- Post added at 11:13 AM ---------- Previous post was at 11:11 AM ----------

you could always look up the oils for what years on a american muscle or 50resto.
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Old 07-10-2012, 02:01 AM   #11
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How much should I.put.in the rearend with the friction modifier?
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