Eaton Posi Diff. Noise

KM3434 · May 6th, 2008, 05:44 PM

In the last few months I began to notice that when I make tight turns, right or left, I hear a noise like something is rubbing and it is definitely coming from the rear end. It also sometimes sounds like a clapping sound and you can feel a vibration. I have checked clearance and there is no rubbing on exhaust or anything that I can see. About a year ago I had to get the rear end rebuilt so I got the Eaton Posi dif with 3.73 gears put in. I have heard that the posi rears can make some noise because of the outside wheel spinning faster than the inside, but I just dont know how loud and what that is supposed to feel like. If anyone could tell me if this is normal or what I would appreciate it. Thanks

KM3434 · May 7th, 2008, 12:15 AM

bump........

KM3434 · May 8th, 2008, 12:47 AM

no one has an Eaton rear end?

White99stang · May 8th, 2008, 03:43 PM

the posi might be going bad

KM3434 · May 8th, 2008, 06:12 PM

its only a year old, never been to the track, the car only has exhaust and an intake and does not get beaten on...could it really be going bad? Have you never heard of the rear end doing that before?

futureMACH1racer · May 8th, 2008, 08:06 PM

Sounds to me like, something wasn't aligned right. Possibly to much lasche...

KM3434 · May 8th, 2008, 08:49 PM

i talked to the guy who installed it and he said that if it wasnt aligned correctly it would have shown up a lot earlier and it would probably be making a whine sound

futureMACH1racer · May 9th, 2008, 02:06 PM

True, IDK then... Maybe it's something else?

KM3434 · May 9th, 2008, 03:46 PM

is there a chance that it is supposed to do it?

futureMACH1racer · May 9th, 2008, 03:52 PM

Not a vibration, I slight noise while turning is normal, but a vibration is what worries me.

KM3434 · May 9th, 2008, 08:29 PM

one guy i talked to compared it to like a 4 wheel drive truck. Like the car having like a hopping feeling when turning. Sometimes it feels exactly like that and other times im not so sure. When you say a slight noise, what do u mean, like what would u expect it to sound like?

futureMACH1racer · May 9th, 2008, 09:20 PM

a slight clicking noise or ever so slight whine.

futureMACH1racer · May 9th, 2008, 09:22 PM

One of my old trucks had a a detroit locker rear and true trac upfront. the rear would make a clicking noise while turning, sometime a slight whine while in sharp 90 degree turns. I also had 40" mud tires so it didn't help much.

qwik48r · May 9th, 2008, 09:46 PM

to test a cone type posi: drive with one wheel on the grass, one on the pavement. spin the tires... you WILL know if its a shot differential.. Eaton is a STRONNNNNG unit. i run a 8.5" 10 bolt in my cheby. still verrrryy quiet.

Tmac3320 · May 10th, 2008, 02:10 AM

yeah i've got the stock lsd and when i take tight turns to the left they both lock up when i floor it. but when i turn to the right and floor it, the inside tire spins. it drives me nuts. so i'm gonna re build mine soon for 31 spline and 3.90's

Tmac3320 · May 10th, 2008, 05:56 PM

i also heard that puting an f150 S spring in there helps for more traction. anyone else know of that?

Tmac3320 · May 11th, 2008, 12:40 PM

el bumpo

KM3434 · May 11th, 2008, 12:57 PM

i was drivin around yesterday and something definitely doesnt seem right...i think ill be going to the performance shop that installed it tomorrow

May 6th, 2008, 05:44 PM	#1
KM3434 Regular Join Date: Aug 2007 Posts: 50 iTrader: 0 reviews	Eaton Posi Diff. Noise In the last few months I began to notice that when I make tight turns, right or left, I hear a noise like something is rubbing and it is definitely coming from the rear end. It also sometimes sounds like a clapping sound and you can feel a vibration. I have checked clearance and there is no rubbing on exhaust or anything that I can see. About a year ago I had to get the rear end rebuilt so I got the Eaton Posi dif with 3.73 gears put in. I have heard that the posi rears can make some noise because of the outside wheel spinning faster than the inside, but I just dont know how loud and what that is supposed to feel like. If anyone could tell me if this is normal or what I would appreciate it. Thanks

May 8th, 2008, 03:43 PM	#4
White99stang MM's nicest mod, :) Join Date: Aug 2005 Location: Apex, NC Posts: 3,771 iTrader: 0 reviews	the posi might be going bad __________________ 06 Dodge MegaCab Diesel 455rwhp/815rwtq REAL TRUCKS DON'T USE SPARK PLUGS

May 8th, 2008, 08:06 PM	#6
futureMACH1racer I.D.G.A.F. 2009 John Deere 9670 Join Date: Sep 2007 Location: United States of America Posts: 11,347 iTrader: 0 reviews	Sounds to me like, something wasn't aligned right. Possibly to much lasche... __________________ RIP Travis Bilings 5/6/1982-7/5/2011 Be polite. Be professional. But have a plan to kill everyone you meet.

May 9th, 2008, 02:06 PM	#8
futureMACH1racer I.D.G.A.F. 2009 John Deere 9670 Join Date: Sep 2007 Location: United States of America Posts: 11,347 iTrader: 0 reviews	True, IDK then... Maybe it's something else? __________________ RIP Travis Bilings 5/6/1982-7/5/2011 Be polite. Be professional. But have a plan to kill everyone you meet.

May 9th, 2008, 03:52 PM	#10
futureMACH1racer I.D.G.A.F. 2009 John Deere 9670 Join Date: Sep 2007 Location: United States of America Posts: 11,347 iTrader: 0 reviews	Not a vibration, I slight noise while turning is normal, but a vibration is what worries me. __________________ RIP Travis Bilings 5/6/1982-7/5/2011 Be polite. Be professional. But have a plan to kill everyone you meet.

May 7th, 2008, 12:15 AM	#2
KM3434 Regular Join Date: Aug 2007 Posts: 50 iTrader: 0 reviews	bump........

May 8th, 2008, 12:47 AM	#3
KM3434 Regular Join Date: Aug 2007 Posts: 50 iTrader: 0 reviews	no one has an Eaton rear end?

May 8th, 2008, 06:12 PM	#5
KM3434 Regular Join Date: Aug 2007 Posts: 50 iTrader: 0 reviews	its only a year old, never been to the track, the car only has exhaust and an intake and does not get beaten on...could it really be going bad? Have you never heard of the rear end doing that before?

May 8th, 2008, 08:49 PM	#7
KM3434 Regular Join Date: Aug 2007 Posts: 50 iTrader: 0 reviews	i talked to the guy who installed it and he said that if it wasnt aligned correctly it would have shown up a lot earlier and it would probably be making a whine sound

May 9th, 2008, 03:46 PM	#9
KM3434 Regular Join Date: Aug 2007 Posts: 50 iTrader: 0 reviews	is there a chance that it is supposed to do it?

May 9th, 2008, 08:29 PM	#11
KM3434 Regular Join Date: Aug 2007 Posts: 50 iTrader: 0 reviews	one guy i talked to compared it to like a 4 wheel drive truck. Like the car having like a hopping feeling when turning. Sometimes it feels exactly like that and other times im not so sure. When you say a slight noise, what do u mean, like what would u expect it to sound like?

May 9th, 2008, 09:20 PM	#12
futureMACH1racer I.D.G.A.F. 2009 John Deere 9670 Join Date: Sep 2007 Location: United States of America Posts: 11,347 iTrader: 0 reviews	a slight clicking noise or ever so slight whine. __________________ RIP Travis Bilings 5/6/1982-7/5/2011 Be polite. Be professional. But have a plan to kill everyone you meet.

May 9th, 2008, 09:22 PM	#13
futureMACH1racer I.D.G.A.F. 2009 John Deere 9670 Join Date: Sep 2007 Location: United States of America Posts: 11,347 iTrader: 0 reviews	One of my old trucks had a a detroit locker rear and true trac upfront. the rear would make a clicking noise while turning, sometime a slight whine while in sharp 90 degree turns. I also had 40" mud tires so it didn't help much. __________________ RIP Travis Bilings 5/6/1982-7/5/2011 Be polite. Be professional. But have a plan to kill everyone you meet.

May 9th, 2008, 09:46 PM	#14
qwik48r MM Fanatic alotta shit no fat girls fast Join Date: Jan 2008 Location: in the woods Posts: 3,681 iTrader: 1 reviews	to test a cone type posi: drive with one wheel on the grass, one on the pavement. spin the tires... you WILL know if its a shot differential.. Eaton is a STRONNNNNG unit. i run a 8.5" 10 bolt in my cheby. still verrrryy quiet. __________________ mind your business what i drive... i'm on a fucking mustang forum. qwik's build

May 10th, 2008, 02:10 AM	#15
Tmac3320 Enthusiast 2000 Mustang GT Join Date: Nov 2007 Posts: 791 iTrader: 0 reviews	yeah i've got the stock lsd and when i take tight turns to the left they both lock up when i floor it. but when i turn to the right and floor it, the inside tire spins. it drives me nuts. so i'm gonna re build mine soon for 31 spline and 3.90's __________________ ___________ 0hp 0tq

Remove Advertisements Sponsored Links
Ford Mustang Forum Advertisement

LinkBacks (?) LinkBack to this Thread: http://www.moddedmustangs.com/forums/99-04/69760-eaton-posi-diff-noise.html
Posted By	For	Type	Date
Eaton Posi Diff. Noise	This thread	Refback	May 7th, 2008 12:24 AM

Threads Similar to: Eaton Posi Diff. Noise
Thread	Thread Starter	Forum	Replies	Last Post
Trac Lok Posi vs Eaton Posi?	cosworthpower	Modular Mustangs	4	April 24th, 2008 03:01 AM
Eaton Posi LSD 8.8	pilot37	99-04	0	December 12th, 2007 12:49 PM
suicide diff vs posi	myeleanor	V6 Mustangs	2	June 13th, 2007 11:32 AM
suicide diff vs posi	myeleanor	V6 Mustangs	7	May 21st, 2007 02:02 PM
diff noise	amber	Modular Mustangs	4	February 27th, 2007 03:39 PM

May 10th, 2008, 05:56 PM	#16
Tmac3320 Enthusiast 2000 Mustang GT Join Date: Nov 2007 Posts: 791 iTrader: 0 reviews	i also heard that puting an f150 S spring in there helps for more traction. anyone else know of that? __________________ ___________ 0hp 0tq

May 11th, 2008, 12:40 PM	#17
Tmac3320 Enthusiast 2000 Mustang GT Join Date: Nov 2007 Posts: 791 iTrader: 0 reviews	el bumpo __________________ ___________ 0hp 0tq

May 11th, 2008, 12:57 PM	#18
KM3434 Regular Join Date: Aug 2007 Posts: 50 iTrader: 0 reviews	i was drivin around yesterday and something definitely doesnt seem right...i think ill be going to the performance shop that installed it tomorrow

All times are GMT -4. The time now is 10:25 PM.
Contact Us - Modded Mustangs : Ford Mustang Forums - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.