35thls1ss19

iTrader: (1)

I have had my rear in my car for a year, or a lil less. Its been fine i changed the fluid about a month ago for the first time after the break in time. The mechanic who did it for me said i should put synthetic... so i did with the additive for the tru trac. I no get a noise when i am driving. its like a wa wa wa wa every time the axle goes around..... thats really the only way i can describe it lol. should i have not put synthetic in? Or what else could it be? thanks alot

xpndbl3

iTrader: (23)

if it started after the fluid swap then i would blame the fluid. If it started after you beat on it then, there's your answer.

99DWPTA

iTrader: (10)

How does this help him?? hes asking if he should of put synthetic in the rear. anyone answer that question??

qwikz28

iTrader: (12)

for my tru trac i didnt use an additive as i was told by moser. i dont remember if i used synthetic or not though. i'm pretty sure i didnt

EPP

iTrader: (22)

You don't need additive with a Truetrac. I'd change the fluid back out and put non synthetic gear oil back in. Bob

chicane

#2...What Bob said.

Scott@DrivelineSolutions

iTrader: (22)

I don't recomend synthetic for anything automotive related. I do run M1 15-W50 in my race car motor but that is what my builder recomends after the rings seat. I would say there is probably debri in the oil, maybe the mechanic didn't clean it out good enough and that will sometimes cause a noise.

35thls1ss19

iTrader: (1)

what fluid do you suggest? thanks for the responses

qwikz28

iTrader: (12)

after much research.... i ended up putting 2 quarts of 80/90 dyno oil and topped it off with 1 quart of 95/140. but that was with a 12 bolt with the same diff.

35th SS

iTrader: (2)

any 80/90 non synthetic brand or whichever you prefer.the cause of the noise on your rear is from the syn.oil that your mechanic use.good luck.

1nastyss

iTrader: (12)

agreed, use a non synthetic gear oil with no additive, i went with the valvoline 70/90