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Author Message   millheaven (Chrisseries1) New Member Username: Chrisseries1 Post Number: 25 Registered: 03-2004 Posted on Saturday, March 13, 2004 - 05:14 am:    this is a question that is not even for rovers but for a ford super duty rear differintal. hope this does not offend anyone here and if so please steer me in the right direction. my question is that the limited slip rear dif seems to be making skipping and clunking sounds as drive is taken up, and more so upon going around cornnors. what could the problem be. is this an easy fix or is the dif shot. the gear oil just changed. any thoughts   Matthew Mogi (Lzxray3) New Member Username: Lzxray3 Post Number: 22 Registered: 11-2003 Posted on Saturday, March 13, 2004 - 05:26 am:    Who changed the oil?? Did they replace it with limited slip gear oil or regular oil? Correct me if I am wrong but without the additives in lim-slip oil it will cause the problems you are describing.   millheaven (Chrisseries1) New Member Username: Chrisseries1 Post Number: 26 Registered: 03-2004 Posted on Saturday, March 13, 2004 - 05:50 am:    yes it has the correct oil and additive. may be the clutchs are worn out. are they easy to replace   Justin V. Nevitt (What_rd) New Member Username: What_rd Post Number: 25 Registered: 02-2004 Posted on Saturday, March 13, 2004 - 11:39 pm:    SD's use 90W140 synthetic in the rear diff. I've seen similar problem with other posi diffs. Add one more posi additive before rebuilding. I've used a number of different brands, and have had great success with the Sta-lube product. Peace.   Chuck Stroud (Str0ud) New Member Username: Str0ud Post Number: 18 Registered: 02-2004 Posted on Sunday, March 14, 2004 - 12:50 am:    Chris, Try Ford Racing Performance Parts Friction Modifier part # M-19546-A -Str0ud   millheaven (Chrisseries1) New Member Username: Chrisseries1 Post Number: 30 Registered: 03-2004 Posted on Sunday, March 14, 2004 - 10:12 am:    hey again so can i get this sta-lube or other additive at the dealer i guess so there is a part number there. or do i go to a custom shop for it?   Chuck Stroud (Str0ud) New Member Username: Str0ud Post Number: 19 Registered: 02-2004 Posted on Sunday, March 14, 2004 - 12:32 pm:    Chris, You can get the Ford Racing Friction Modifier at any dealership, if they don't stock it they can order it for you. If you would like to order it yourself Call Ford Racing @1-586-468-1356 or visit the website to order. WWW.FordRacing.Com/Performanceparts -Str0ud   inceiptiant spin (Chrisseries1) New Member Username: Chrisseries1 Post Number: 34 Registered: 03-2004 Posted on Sunday, March 14, 2004 - 12:42 pm:    tanks a lot i will look into this asap and be adding it in to the rear pod. its worth a try and better then a rebuild. but what is causing this? the clutches or what.   Roger Fastring (Fastring) Member Username: Fastring Post Number: 69 Registered: 02-2003 Posted on Sunday, March 14, 2004 - 12:49 pm:    I had a 96 with the full floating 10.25 and a 97 light duty with the semi floating 10.25. In the 97, it acted as you described, even after proper oil changing (with ford additive). I sold the truck last year at 170k with that same problem, never 'broke'. Depending on your tolerance of the chatter, you may be ok just driving it...   Chuck Stroud (Str0ud) New Member Username: Str0ud Post Number: 20 Registered: 02-2004 Posted on Sunday, March 14, 2004 - 12:51 pm:    What brand of limited slip rear end is it? -Str0ud   inceiptiant spin (Chrisseries1) New Member Username: Chrisseries1 Post Number: 35 Registered: 03-2004 Posted on Sunday, March 14, 2004 - 01:02 pm:    that i am not sure it came with the truck n 1999 as an option. so that is all i can tell you.   Chuck Stroud (Str0ud) New Member Username: Str0ud Post Number: 21 Registered: 02-2004 Posted on Sunday, March 14, 2004 - 01:13 pm:    Chris, With a lot of the limited slip rear ends, the chatter and clunking is just the action of the limited slip rear functioning properly. Especially around corners when the wheels are turning at different speeds. Take comfort in the fact that these noises verify your rear end is working properly. If you used the proper gear oil and the friction modifier (Ford), no worries. If not drain 4 ounces of fluid from the pumpkin and add the four ounce bottle of Ford Racing Friction Modifier and call it good. It's no rover thats for sure!   Chuck Stroud (Str0ud) New Member Username: Str0ud Post Number: 22 Registered: 02-2004 Posted on Sunday, March 14, 2004 - 01:19 pm:    www.FordTrucks.com has a great board for helping to maintain these trucks. -Str0ud   inceiptiant spin (Chrisseries1) New Member Username: Chrisseries1 Post Number: 37 Registered: 03-2004 Posted on Sunday, March 14, 2004 - 03:02 pm:    thanks again chuck i will check out the link above. its just not the same as it was when i got it brand new. but then again it is not new any more! lol like dam beaten to death.   Justin V. Nevitt (What_rd) New Member Username: What_rd Post Number: 26 Registered: 02-2004 Posted on Monday, March 15, 2004 - 01:40 am:    The limited slip should not make noise @ all, especially under normal driving. The noise is from the clutches sticking. Sta-lube can be found @ Pep-Boys. And it does not hurt to add more than one posi additive unit. That Sterling is much larger with larger clutches and a greater fluid capacity. One unit gets deluted moreso than when used in an 8.8 or D44.   kay tell (Chrisseries1) Member Username: Chrisseries1 Post Number: 48 Registered: 03-2004 Posted on Monday, March 15, 2004 - 09:09 am:    thanks justin i will be dealing with this today. so i guess there are sticky cluches then. maybe i wwill flush and fill one more time to get any shit out of there.