What gear oil to use in turbo coupe rear? January 06, 2008, 02:23:39 AM I'm rebuilding a rear end out of a turbo coupe to swap for my one-legged 2.73. I've been to Pep Boys and Autozone looking for the gear oil and I've gotten differing answers to which gear oil to use. Anyone here know what it's supposed to be, and where to find it.Thanks.P.S. How come my signature pic does not show up? Quote Selected
What gear oil to use in turbo coupe rear? Reply #1 – January 06, 2008, 02:43:58 AM Quote from: jgonza2;196001I'm rebuilding a rear end out of a turbo coupe to swap for my one-legged 2.73. I've been to Pep Boys and Autozone looking for the gear oil and I've gotten differing answers to which gear oil to use. Anyone here know what it's supposed to be, and where to find it.Thanks.80-90 or 85-140 pick one Quote from: jgonza2;196001P.S. How come my signature pic does not show up?i guess you did"nt do it right.. Quote Selected
What gear oil to use in turbo coupe rear? Reply #2 – January 06, 2008, 07:56:13 AM Don't forget to add friction modifier. Quote Selected
What gear oil to use in turbo coupe rear? Reply #3 – January 06, 2008, 08:20:43 AM yeh the friction modifier is VERY important. i had an old rear that i got rid of b/c i ran it without the modifier and the gears would whine like a skewed cat. i didnt HAVE to get rid of it but i couldnt handle it anymore. it'll burn the gears up without it to a certain degree. Quote Selected
What gear oil to use in turbo coupe rear? Reply #4 – January 06, 2008, 08:39:47 AM Quote from: ~AC;196016yeh the friction modifier is VERY important. i had an old rear that i got rid of b/c i ran it without the modifier and the gears would whine like a skewed cat. i didnt HAVE to get rid of it but i couldnt handle it anymore. it'll burn the gears up without it to a certain degree.LoL Without the additive the clutches in the limited slip unit tend to chatter (scrub one wheel) when turning instead of releasing smoothly.But some older well used units may pop and such but you wont get a whine like your describing wich sounds like the rear end you had either had the gear backlash setup wrong or it had a bad bearing.Back to topic- i use synthetic 80/90 or 85/140 (severe use) Quote Selected
What gear oil to use in turbo coupe rear? Reply #5 – January 06, 2008, 08:53:02 AM maybe the bearing started going bad after that gear-oil change? but it was a whine and a pop in my situation, open dif. Quote Selected
What gear oil to use in turbo coupe rear? Reply #6 – January 06, 2008, 09:14:28 AM Quote from: ~AC;196019maybe the bearing started going bad after that gear-oil change? but it was a whine and a pop in my situation, open dif.Possibly, Open diffs do not use friction modifier. Quote Selected
What gear oil to use in turbo coupe rear? Reply #7 – January 06, 2008, 09:23:58 AM my owners manual back before i put it up too well said it needed it :x Quote Selected
What gear oil to use in turbo coupe rear? Reply #8 – January 06, 2008, 10:40:34 AM I used Royal Purple gear oil. It was a little expensive, but it made everything feel more smooth. I put it in my T5 and rear at the same time. Royal Purple also doesnt need friction modifier. Quote Selected
What gear oil to use in turbo coupe rear? Reply #9 – January 06, 2008, 04:15:47 PM Quote from: Tbird232ci;196043I used Royal Purple gear oil. It was a little expensive, but it made everything feel more smooth. I put it in my T5 and rear at the same time. Royal Purple also doesnt need friction modifier.what weight on that royal purple? I already purchased the bottle of friction modifier from Ford. Would it hurt anything if I put it in with royal purple anyway. (The stuff stinks and I want to get rid of it.) Quote Selected
What gear oil to use in turbo coupe rear? Reply #10 – January 06, 2008, 04:45:31 PM I used the mobil 1 at autozone, I think it was 75w90. Along with a tube of the friction modifier, TransX or whatever? Quote Selected
What gear oil to use in turbo coupe rear? Reply #11 – January 07, 2008, 09:50:44 AM Quote from: jgonza2;196092what weight on that royal purple? I already purchased the bottle of friction modifier from Ford. Would it hurt anything if I put it in with royal purple anyway. (The stuff stinks and I want to get rid of it.) I have no clue about adding the modifier to the royal purple. But if you the think the modifier stinks when was the last time you opened a bottle of 80-90 or a rear diff? That be some stinky stuff right there. Quote Selected
What gear oil to use in turbo coupe rear? Reply #12 – January 07, 2008, 06:09:56 PM used mopar 75/140 synthetic(since i work for dodge and it was free) in my tc rear and it works mint. Quote Selected
What gear oil to use in turbo coupe rear? Reply #13 – January 08, 2008, 01:23:49 PM Quote from: ipsd;196245I have no clue about adding the modifier to the royal purple. But if you the think the modifier stinks when was the last time you opened a bottle of 80-90 or a rear diff? That be some stinky stuff right there.I haven't opened a bottle of 80-90 or the bottle of friction modifier I have...the stink comes through the sealed plastic bottle somehow. The rearends I've opened have not smelled as bad as this friction modifier.dominator said "used mopar 75/140 synthetic(since i work for dodge and it was free) in my tc rear and it works mint."How much to ship 3.5 pints of it to Calif? (lol) Quote Selected
What gear oil to use in turbo coupe rear? Reply #14 – January 08, 2008, 02:56:33 PM heh this is kind of off topic, but we did maintenance on an 8.8 trac-lock and had used the friction modifier in it. there was a guy that didnt last long there b/c he was a dick and a know it all that didnt know ANYTHING and he has the biggest toolbox in the world (i dont get that whole deal where guys have to have the biggest tool box in the shop) but his was so tall and he was a short guy, so we played a prank and took the tube of modifier on the top of his box where he couldnt reach... so after a week or so we couldnt handle the smell either so we clued him in and it wasnt a week later he quit. good riddance! the shop i worked at at the time had like 2 or 3 returns but when he was working there his cars kept coming back, i guess where he's from a return car is charged for the labor or something but we didnt do that at that shop, if it was a return for a problem we caused it was free. i had to work on some stuff he did and messed up, i cant describe the stupidity! Quote Selected
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