Rear End Problems

01dutchGT · November 9th, 2007, 04:12 PM

I had my MM full length subframe connectors welded in today and when if was up on the lifts, I noticed rear end fluid all over my mufflers. My friend is a ford mechanic and he looked at it and said that i had to much play in the drive shaft and may have to rebuild the rear end. What exactly does this mean. I just 4.10 gears put in and there isnt any wine and works perfectly. I just think that the bearings and seal are bad. Any help would be great.

MustangMatt96GT · November 9th, 2007, 04:14 PM

Its just a bad pinion seal most likely!

GTsetGO · November 9th, 2007, 04:16 PM

Originally Posted by MustangMatt96GT

Its just a bad pinion seal most likely!

+1, is it leaking from the front of the rearend? where the driveshaft goes in?

01dutchGT · November 9th, 2007, 04:33 PM

yes i think so. If its a bad seal, will that make the drive shaft loose or is it suppose to move alittle.

the real shocker · November 9th, 2007, 04:44 PM

my car is terrible about tearing up pinion seals...

I've put 4 in since last september! finally have it fixed for good this time.... But I would imagine if you just had gears put in, they would have replaced the pinion seal? Were you able to trace about where it was coming from... and about how much slack do you have in the driveshaft?

01dutchGT · November 9th, 2007, 05:00 PM

The guy said its moving to much. I felt it and it can wiggle about 1/8 inch in each directions or somewhere in that range. Ill have to look exactly where its coming from but i know its from somewhere in the front where the driveshaft meets up. I have a feeling its the bearings but i wont have to replace my gears right because I know there installed right and work fine. Now the place could have screwed up on the seal but im not sure.

gills99stang · November 9th, 2007, 05:30 PM

I would guess the seal first, but I suppose the bearings could be an issue.

01dutchGT · November 9th, 2007, 06:19 PM

I thought that the ford rear ends were really strong so im not thinking its the bearings but hopefully it will only be seal. If im going to have rebuild it, what would i need to get to make it stronger.

2kGT · November 9th, 2007, 07:33 PM

My rear flings fluid all over the mufflers too -my pinion seal is leaking, just dont feel like fixing it - its a b1tch. Could be a bent driveshaft that causes these leaks.

steveduvall · November 9th, 2007, 07:48 PM

Originally Posted by 01dutchGT

I had my MM full length subframe connectors welded in today and when if was up on the lifts, I noticed rear end fluid all over my mufflers. My friend is a ford mechanic and he looked at it and said that i had to much play in the drive shaft and may have to rebuild the rear end. What exactly does this mean. I just 4.10 gears put in and there isnt any wine and works perfectly. I just think that the bearings and seal are bad. Any help would be great.

Well I dont know who did the install for your 4.10's but it sounds like they didnt get the setup right, there is a crush sleeve on the pinion that requires when installed to be crushed to a certain depth and this is done by the nut on the pinion flange, its quite obviouse due to the oil leak, you will need to have a new crush sleave and new pinion seal! I would recommend that you take this to a ford dealership to be done because they have the correct tools and it will be done correctly! Also this will not cost as much as one would think at the dealer.

the real shocker · November 10th, 2007, 12:51 AM

FYI - The leak may look really bad, but a small drop goes a long way....

still something to be fixed, but its probably not near as bad as you think...

superbeef1000 · November 10th, 2007, 01:12 AM

+1 for the pinion seal

thenewGT350 · November 10th, 2007, 01:45 AM

I just installed a Detroit Trutrac in mine and had the same problem. I went 2 months and finally just replaced the seal. but just cus it leaks doesn't mean anything else is bad. if it was a bearing you would deffinetly hear something. you could logically hold out as long as you want, just keep an eye on the fluid level, or your bearings will go bad, or worse sieze up.

JohnC · November 10th, 2007, 08:39 AM

Originally Posted by steveduvall

I would recommend that you take this to a ford dealership to be done because they have the correct tools and it will be done correctly! Also this will not cost as much as one would think at the dealer.

I had my 3:73's installed at Two Rivers Ford in Donelson TN and they screwed mine up.

That said, I wouldn't recommend just any Ford dealer or shop to do the work. I'd check around and see who all has gears done properly and ask what shop did the install.

01dutchGT · November 10th, 2007, 09:45 AM

Eaton Posi Limited Slip 8.8in 31 Spline Differential.... Would this work with my car and would it make it stronger? Thanks for all the opinions on it, ill probably take it to the ford dealer to have them look at it today. How much you think it would cost to get new crush sleeve and seal...Like i said there isnt any wine with gear and drives perfect with no problems just some fluid out the back so i have a feeling yall are right and its just a small drop.

WAR-PARTY · November 10th, 2007, 01:51 PM

Well I dont know who did the install for your 4.10's but it sounds like they didnt get the setup right, there is a crush sleeve on the pinion that requires when installed to be crushed to a certain depth and this is done by the nut on the pinion flange, its quite obviouse due to the oil leak, you will need to have a new crush sleave and new pinion seal! I would recommend that you take this to a ford dealership to be done because they have the correct tools and it will be done correctly! Also this will not cost as much as one would think at the dealer.

There is a replacement for the crush sleve, (it's not a crush sleve) you'll have to ask maybe JEGS or MMR what it is called, get your drive shaft check and replace the pinion seal

thenewGT350 · November 11th, 2007, 11:44 PM

as for the eaton posi, you can get one that will fit, but the best on the market is the deroit tru trac. its a gear type instead of the clutch type and can handle up to 900 ft lbs. of torque. this is the one that all those rock crawler guys use and Nascar as well. any other type is sub-par.
the Tru trac will run you about $500 though but its money well spent.

Black Bullitt · November 12th, 2007, 09:59 AM

Go here for a true trac. TRUE TRAC-8.8 31 SPLINE - GEARS, LOCKERS, INSTALL KITS, FORD 8.8"

This is a 31 spline one but if you go back one page you will see the 28 spline one.

November 9th, 2007, 04:12 PM	#1
01dutchGT Regular 1965 Ford Mustang Join Date: Jun 2007 Location: Houston, Texas Posts: 481 iTrader: 0 reviews	Rear End Problems I had my MM full length subframe connectors welded in today and when if was up on the lifts, I noticed rear end fluid all over my mufflers. My friend is a ford mechanic and he looked at it and said that i had to much play in the drive shaft and may have to rebuild the rear end. What exactly does this mean. I just 4.10 gears put in and there isnt any wine and works perfectly. I just think that the bearings and seal are bad. Any help would be great. __________________ 2001 mustang gt 5 speed Full bolt ons with 4.10 gears. 1965 Mustang 302 with 4 Barrel edelbrock 600cfm, T5 transmission, Hurst short throw shifter. In the process of restoring it...

November 9th, 2007, 04:14 PM	#2
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,689 iTrader: 3 reviews	Its just a bad pinion seal most likely! __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

November 9th, 2007, 04:33 PM	#4
01dutchGT Regular 1965 Ford Mustang Join Date: Jun 2007 Location: Houston, Texas Posts: 481 iTrader: 0 reviews	yes i think so. If its a bad seal, will that make the drive shaft loose or is it suppose to move alittle. __________________ 2001 mustang gt 5 speed Full bolt ons with 4.10 gears. 1965 Mustang 302 with 4 Barrel edelbrock 600cfm, T5 transmission, Hurst short throw shifter. In the process of restoring it...

November 9th, 2007, 04:44 PM	#5
the real shocker Hardcore Enthusiast 2002 Mustang GT 13.00 @ 105 Join Date: Feb 2007 Location: Jackson, MS Posts: 1,820 iTrader: 1 reviews	my car is terrible about tearing up pinion seals... I've put 4 in since last september! finally have it fixed for good this time.... But I would imagine if you just had gears put in, they would have replaced the pinion seal? Were you able to trace about where it was coming from... and about how much slack do you have in the driveshaft? __________________

November 9th, 2007, 05:00 PM	#6
01dutchGT Regular 1965 Ford Mustang Join Date: Jun 2007 Location: Houston, Texas Posts: 481 iTrader: 0 reviews	The guy said its moving to much. I felt it and it can wiggle about 1/8 inch in each directions or somewhere in that range. Ill have to look exactly where its coming from but i know its from somewhere in the front where the driveshaft meets up. I have a feeling its the bearings but i wont have to replace my gears right because I know there installed right and work fine. Now the place could have screwed up on the seal but im not sure. __________________ 2001 mustang gt 5 speed Full bolt ons with 4.10 gears. 1965 Mustang 302 with 4 Barrel edelbrock 600cfm, T5 transmission, Hurst short throw shifter. In the process of restoring it...

November 9th, 2007, 05:30 PM	#7
gills99stang Achieving more N/A power! When this baby hits 88 miles an hour... Join Date: Sep 2006 Location: Virginia Beach, Virginia Posts: 3,154 iTrader: 3 reviews	I would guess the seal first, but I suppose the bearings could be an issue. __________________ Brendan '99 Mustang GT [ 318 rwhp N/A ] - SOLD () '04 F150 XLT SuperCab

November 9th, 2007, 06:19 PM	#8
01dutchGT Regular 1965 Ford Mustang Join Date: Jun 2007 Location: Houston, Texas Posts: 481 iTrader: 0 reviews	I thought that the ford rear ends were really strong so im not thinking its the bearings but hopefully it will only be seal. If im going to have rebuild it, what would i need to get to make it stronger. __________________ 2001 mustang gt 5 speed Full bolt ons with 4.10 gears. 1965 Mustang 302 with 4 Barrel edelbrock 600cfm, T5 transmission, Hurst short throw shifter. In the process of restoring it...

November 9th, 2007, 07:33 PM	#9
2kGT Enthusiast Join Date: Oct 2007 Location: Upstate SC Posts: 922 iTrader: 0 reviews	My rear flings fluid all over the mufflers too -my pinion seal is leaking, just dont feel like fixing it - its a b1tch. Could be a bent driveshaft that causes these leaks. __________________ Accufab 75mm tb & plenum MRT h-pipe Flowmaster catback FRPP king cobra clutch FRPP aluminum driveshaft FRPP 4.10 gear TA Perfromance girdle Steeda tri-ax shifter Moser 31 spline axles FRPP C Springs

November 10th, 2007, 12:51 AM	#11
the real shocker Hardcore Enthusiast 2002 Mustang GT 13.00 @ 105 Join Date: Feb 2007 Location: Jackson, MS Posts: 1,820 iTrader: 1 reviews	FYI - The leak may look really bad, but a small drop goes a long way.... still something to be fixed, but its probably not near as bad as you think... __________________

November 10th, 2007, 01:12 AM	#12
superbeef1000 Hardcore Enthusiast Join Date: Aug 2006 Location: mesa , arizona Posts: 1,474 iTrader: 2 reviews	+1 for the pinion seal __________________ a bunch of stuff to make my car faster http://www.moddedmustangs.com/forums...e-member-1497/

November 10th, 2007, 01:45 AM	#13
thenewGT350 Newbie Join Date: Nov 2007 Location: Tehachapi, So-CAL Posts: 16 iTrader: 0 reviews	I just installed a Detroit Trutrac in mine and had the same problem. I went 2 months and finally just replaced the seal. but just cus it leaks doesn't mean anything else is bad. if it was a bearing you would deffinetly hear something. you could logically hold out as long as you want, just keep an eye on the fluid level, or your bearings will go bad, or worse sieze up.

November 10th, 2007, 09:45 AM	#15
01dutchGT Regular 1965 Ford Mustang Join Date: Jun 2007 Location: Houston, Texas Posts: 481 iTrader: 0 reviews	Eaton Posi Limited Slip 8.8in 31 Spline Differential.... Would this work with my car and would it make it stronger? Thanks for all the opinions on it, ill probably take it to the ford dealer to have them look at it today. How much you think it would cost to get new crush sleeve and seal...Like i said there isnt any wine with gear and drives perfect with no problems just some fluid out the back so i have a feeling yall are right and its just a small drop. __________________ 2001 mustang gt 5 speed Full bolt ons with 4.10 gears. 1965 Mustang 302 with 4 Barrel edelbrock 600cfm, T5 transmission, Hurst short throw shifter. In the process of restoring it...

November 10th, 2007, 01:51 PM	#16
WAR-PARTY Hardcore Enthusiast 2001 YUGO GT Join Date: Aug 2006 Location: GOAT LOCKER PENSACOLA FL Posts: 1,700 Blog Entries: 1 iTrader: 0 reviews	Well I dont know who did the install for your 4.10's but it sounds like they didnt get the setup right, there is a crush sleeve on the pinion that requires when installed to be crushed to a certain depth and this is done by the nut on the pinion flange, its quite obviouse due to the oil leak, you will need to have a new crush sleave and new pinion seal! I would recommend that you take this to a ford dealership to be done because they have the correct tools and it will be done correctly! Also this will not cost as much as one would think at the dealer. There is a replacement for the crush sleve, (it's not a crush sleve) you'll have to ask maybe JEGS or MMR what it is called, get your drive shaft check and replace the pinion seal __________________ How I met my wife! Our first date...

November 11th, 2007, 11:44 PM	#17
thenewGT350 Newbie Join Date: Nov 2007 Location: Tehachapi, So-CAL Posts: 16 iTrader: 0 reviews	as for the eaton posi, you can get one that will fit, but the best on the market is the deroit tru trac. its a gear type instead of the clutch type and can handle up to 900 ft lbs. of torque. this is the one that all those rock crawler guys use and Nascar as well. any other type is sub-par. the Tru trac will run you about $500 though but its money well spent. __________________ I got posi WOO-HOO!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Remove Advertisements Sponsored Links
Ford Mustang Forum Advertisement

Threads Similar to: Rear End Problems
Thread	Thread Starter	Forum	Replies	Last Post
8.8' Rear end vs. 9" rear end	jhooper	Classic Mustangs	22	April 25th, 2011 03:59 PM
Rear side seat belt problems	Archy88	General Tech	1	October 9th, 2007 03:09 AM
V6 Problems	Bies08	V6 Mustangs	16	March 22nd, 2007 12:59 AM
Rear Rotors and Rear Axle	rondaw3g0410	99-04	1	September 6th, 2006 10:00 PM
A few problems...	Stan27	Audio/Video	8	August 17th, 2006 01:14 PM

All times are GMT -4. The time now is 03:15 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.

Rear End Problems

Rear End Problems

Crush sleave