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  1. 2006 V6 Differential and Gear Upgrade

    2005-2010 V6 Mustang Tech
    Hey there, looking for some advice on what parts I might consider replacing in my 2006 V6 while I have the rear end apart. I'm installing a limited slip diff and some 4.10 gears. I got the install kit with the bearings and gaskets. A guy I talked to about doing it mentioned something about...
  2. Rear diff pinion seal leak?!?! Please help diag.

    2011 - 2014 Mustang GT Tech
    Alright, a couple of months ago my pinion seal failed. There was oil that sprayed all around the diff, even onto the exhaust pipes in the area, and the underbelly of my car. That was about 6 months ago, and probably 10,000 miles. Today, i had my car in the air replacing the rims, and i noticed...
  3. Ford Rear End/Differential Identification

    Classic Tech
    Hey all, does this seem like an 8 inch Ford rear end to you, because it does to me. Going to upgrade to 3.55 gears and wanted to of course make sure before I bought them. Car was originally a 6 cylinder but now has a 351W and I think the previous owner installed a beefier rear end. Thanks.
  4. This is NOT the Regular Rear Axle Venting, Right?

    2011 - 2014 Mustang GT Tech
    My 2013 V6 had the usual axle vent leaking. The axle was wet, I wiped it dry, and all was well. No problems. With my 2014 GT, however, this amount of leaking doesn't seem normal, right? My growing concern started yesterday when I noticed there were fluid/oil marks on my driveway. I had never...
  5. Gt Rear

    2005-2010 Mustang Talk
    so i recently had an Auburn limited slip installed in my 05 V6, and my speed shop recommended buying a Gt rear for her because the differential can be rough on the stock one. do you Guys recommend anything else and where can i get a good one from?
  6. need help to identify the rear differential

    4.6L Tech
    I just bought an 03 gt convertible that 's had a ton of work done to it and when I went to change the rear diff fluid there isn't a tag to say what gears it has in it. The only tag on it says it requires 75 40w full synthetic fluid only. So how can I tell what gears it has or if it's a different...
  7. screaming from my rear differential on acceleration

    Classic Tech
    Hi folks, I have read so many great and helpful posts on this forum that I thought it was finally time to share one of my own challenges and hopefully find help. I recently acquired a 1965 mustang convertible, sprint 200 6 cyl automatic. We loved it, researched the dealer and bought it...
  8. Stock Drive shaft diameter?

    2005-2010 Mustang GT Tech
    Hey guys, I am trying to figure out what my differential gear ratio is. to do this I am marking my drive shaft and tire and spinning it accordingly to determine the ratio. Here's the problem, I have an aftermarket aluminum drive shaft (either 3.5 or 4.0) so I need to compensate for the extra...
  9. 2011 Mustang GT- Leaking Differential

    2011-2014 Mustang Talk
    Greetings all, it has been awhile! This website has been an amazing resource for me, and I still read the GT Tech section almost daily. FYI, I have a 2011 Mustang GT. That was my daily driver for almost 2 years, and I have driven it once every 2 weeks for the last year. I had a mechanic install...
  10. 2001 Mustang GT burning rubber smell (with photos underneath)

    4.6L Tech
    Hi All. I bought a really nice, clean 2001 GT late July! My first GT! It's got 49K and a manual transmission. The interior is a time capsule with not a spec of dust. When I test drove it from the seller almost everything was perfect, drove straight, great brakes, clutch is fine, etc., but it...
  11. 8.8 Spool with 31 spline axles

    5.0L Tech
    have been searching for hours and cant seem to find the answer. Spool with c-clip eliminators and 31 spline axles meant for c-clips? will that work or do i need to buy special axles without the cut for c-clips or what? Thanks.
  12. 4.10 FRPP rear gears just installed...

    2005-2010 Mustang GT Tech
    I love these gears that were installed in my 08 bullitt. Big difference from the 3.73's. Anyway as you guys probably have already heard, they're making a humming sound at pretty much all speeds. I've already tighten the pinion nut a little bit...didn't work. Had the backlash tighten a little...
  13. 98 gt rear end noise

    4.6L Tech
    hello everyone, im new and I just bought a used 98 mustang gt. the cars is in pretty good shape but i have noticed that when im cruising and on the gas ill hear a whirring noise coming from the back end. I don't know if it the differential or a bearing or something of the sort. I know i need to...
  14. 1971 Mustang Thumping From Rear?

    Classic Talk
    Howdy folks. My 1971 Mustang started making a new sound today. Kind of a thumping sound. It's kinda weird and semi-random. I thought (and was hoping) that it was someone- I mean... SomeTHING in the trunk. It's a low thump that almost seemed like it might have been the sound of my wheels hitting...
  15. rear differential

    2005-2010 Mustang Talk
    im looking to get a new rear differential cover and cant find a good one any tips or links? v6 2008 mustang. also what kind of rear differential fluid should i use?
  16. Help! 2011 GT Differential Moan and Shudder

    2011 - 2014 Mustang GT Tech
    Just signed up, looking for help/advice. I have a 2011 Mustang GT Brembo with 3.73 rear and carbon fiber LSD clutch plates (all factory, car is 100% as it came from Ford). Around 32k the pinion seal went bad for no apparent reason. My dealership replaced it under warranty, but did NOT replace...
  17. 08 GT/CS Differential

    2005-2010 Mustang GT Tech
    '08 GT/CS stock, manual transmission with 14,800 miles to date, just purchased a couple of weeks ago - yahoo!. I have been reading the Differential Threads in attempts to spin my knowledge up on what & how to do it. I intend to replace the Diff Cover with Ford Racing Differential Cover -8.8in...
  18. 93 Mustang differential trouble

    5.0L Tech
    fluids had never been drained in the differential on my mustang, its an 8.8 w/ posi, i then proceeded to fill it back up with 2 quarts, didnt come out the fill hole so i got another quart, still did not come out the fill hole, i have an aftermarket differential cover from ta performance which...
  19. 2006 GT Differential Took Over A Gallon?

    2005-2010 Mustang Talk
    Hey Guys, I just changed out the differential fluid in my 06 GT. I have always been taught that when you do this, you refill the fluid up to the fill hole and then drain just a tiny bit back out. Now I'm not entirely sure how much oil I used when I refilled my differential (i had a partially...
  20. 2012 V6 Mustang with 3.31 rear end grinding noise

    2011-2014 Mustang Talk
    I have a 2012 V6 premium with performance package giving it the 3.31 rear end. The rear end is making a hellacious grinding noise after about an hour at highway speed. Took it to dealer and they said it is due to lack of friction additive. That was added and after another drive, alas the noise...