Changing Rear End Oil

BadBlackGT · April 20th, 2010, 06:00 PM

Sorry, I couldn't post this in the drivetrain section... so if any of the other year model guru's want to step in here you are very welcomed. I got my 4.10's put in a few months ago and have already racked up 1,000 miles on it!

I know I know, but i've heard you should change your gear oil about 500 miles after you did a swap. Is this true, and have i possibly damaged anything waiting this long?

DickH · April 20th, 2010, 06:45 PM

You could change the oil if you want, shouldn't have problems if it was all put in right. Changing oil in the 8.8 is a pain in the ass with a factory cover, so if you insist, get an aftermarket one that has a fill port on the back.

mrbigjeep · April 20th, 2010, 07:26 PM

It's easy and you'll be fine

ajm · April 20th, 2010, 08:20 PM

youll be fine if you dont change it.....if it was required to change the fluid xxx miles after installing new gears how come when your car rolled off the lot it didnt have a maint schedule that requires you to get the rear fluid changed 500 miles after.

F8L GT · April 20th, 2010, 08:26 PM

I havent changed mine and i have about over 1000 miles on mine. Most are track miles with hard launches

JoshC! · April 20th, 2010, 08:28 PM

Originally Posted by BadBlackGT

Sorry, I couldn't post this in the drivetrain section... so if any of the other year model guru's want to step in here you are very welcomed. I got my 4.10's put in a few months ago and have already racked up 1,000 miles on it! I know I know, but i've heard you should change your gear oil about 500 miles after you did a swap. Is this true, and have i possibly damaged anything waiting this long?

i got my gears installed friday and ive already put about 1000 miles on them lol

JerseyTrueBlue · April 20th, 2010, 09:06 PM

Never heard of this with diff fluid, if the level is right and the additive was put in you should be fine man no need to change brand new fluid. I have heard of this on an engine before but never a rear.

ajm · April 20th, 2010, 09:27 PM

^ this used to be talked about a lot about a year ago or so...Luckily it finally died down.

The people that actually believe this needs to be done have a theory that when your new gears "break in" in the first 500 miles theyll shave metal...enough metal to contaminate your fluid to the point where if you dont change the the fluid at 500 miles youll have premature rear end failure.

JoshC! · April 20th, 2010, 09:28 PM

what causes gear whine? and can it harm the gears? i have a friend having this issue with his 3.73s

ajm · April 20th, 2010, 09:29 PM

Bad install be it pinion depth, backlash, or preload. Usually its the pinion depth that causes it though....From what ive seen.

Yes it will/can harm the gears.

JoshC! · April 20th, 2010, 09:43 PM

cool thanks.

BadBlackGT · April 20th, 2010, 10:55 PM

Okay, well everything has been perfect. No wine and launches great... so no change?

ajm · April 20th, 2010, 10:56 PM

^ correct

BadBlackGT · April 20th, 2010, 10:59 PM

Alright, thanks guys! Thats gonna save me some money... guess i'll take the gal out for a night this weekend then go to the track!

April 20th, 2010, 06:45 PM	#2
DickH MM Fanatic 2003 gt 5.4 32v on the way Join Date: May 2007 Location: Omaha Posts: 4,191 iTrader: 2 reviews	You could change the oil if you want, shouldn't have problems if it was all put in right. Changing oil in the 8.8 is a pain in the ass with a factory cover, so if you insist, get an aftermarket one that has a fill port on the back. __________________ 2003 Mustang gt - usual mods - slowly working on 5.4 swap 2004 srt4 - Stock DD/winter beater Click here for your tuning needs Before asking a gearing related question click THIS link and enjoy all your saved time.

April 20th, 2010, 07:26 PM	#3
mrbigjeep I Post Entirely Way Too Much 04 mustang gt 7.21 @ 98 Join Date: Apr 2008 Location: upstate sc Posts: 5,923 iTrader: 1 reviews	It's easy and you'll be fine __________________ cams + 150 shot

April 20th, 2010, 08:26 PM	#5
F8L GT !FACEPLATED! 2002 Mustang GT 7.84 @ 86.01 Join Date: Jul 2008 Location: Upper Michigan Posts: 12,917 iTrader: 13 reviews	I havent changed mine and i have about over 1000 miles on mine. Most are track miles with hard launches __________________ MM Bracket Racing Crew Co-Founder ~Its a Drag Car, Not a Show Car~ LINK-->Custom Race Transmission Build<--LINK

April 20th, 2010, 09:06 PM	#7
JerseyTrueBlue Hardcore Enthusiast 2001 Mustang GT Join Date: Mar 2009 Location: New Jersey Posts: 1,857 iTrader: 3 reviews	Never heard of this with diff fluid, if the level is right and the additive was put in you should be fine man no need to change brand new fluid. I have heard of this on an engine before but never a rear. __________________ True Blue Crew Member #2 315's Crew Member (Dat azz) 255/298 Founder of the please leave my signature alone, I want it to say what I put there and don't appreciate you deleting it club

April 20th, 2010, 09:28 PM	#9
JoshC! I Hate Convertibles... 2000 GT Vert Join Date: Oct 2007 Location: Odessa, Texas Posts: 5,511 iTrader: 0 reviews	what causes gear whine? and can it harm the gears? i have a friend having this issue with his 3.73s __________________ Im topless, are you? Topless Mustang Club Founder Black Stang Crew Member #boobs out mods/pics

April 20th, 2010, 08:20 PM	#4
ajm Banned Join Date: May 2008 Posts: 7,966 iTrader: 4 reviews	youll be fine if you dont change it.....if it was required to change the fluid xxx miles after installing new gears how come when your car rolled off the lot it didnt have a maint schedule that requires you to get the rear fluid changed 500 miles after.

April 20th, 2010, 09:27 PM	#8
ajm Banned Join Date: May 2008 Posts: 7,966 iTrader: 4 reviews	^ this used to be talked about a lot about a year ago or so...Luckily it finally died down. The people that actually believe this needs to be done have a theory that when your new gears "break in" in the first 500 miles theyll shave metal...enough metal to contaminate your fluid to the point where if you dont change the the fluid at 500 miles youll have premature rear end failure.

April 20th, 2010, 09:29 PM	#10
ajm Banned Join Date: May 2008 Posts: 7,966 iTrader: 4 reviews	Bad install be it pinion depth, backlash, or preload. Usually its the pinion depth that causes it though....From what ive seen. Yes it will/can harm the gears.

April 20th, 2010, 09:43 PM	#11
JoshC! I Hate Convertibles... 2000 GT Vert Join Date: Oct 2007 Location: Odessa, Texas Posts: 5,511 iTrader: 0 reviews	cool thanks. __________________ Im topless, are you? Topless Mustang Club Founder Black Stang Crew Member #boobs out mods/pics

April 20th, 2010, 10:56 PM	#13
ajm Banned Join Date: May 2008 Posts: 7,966 iTrader: 4 reviews	^ correct

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