Rearend has a vicious knocking - ideas
07-29-2006, 03:37 AM
#1
FormerVendor
Thread Starter
iTrader: (32)
Join Date: Jul 2003
Location: Lexington, KY
Posts: 3,654
Likes: 0
Received 0 Likes
on
0 Posts
Rearend has a vicious knocking - ideas Okay, so my buddy's SS has a problem. When he drives in a straight line, it is fine. When he cuts the wheel and turns, the diff goes through hell and back. So, it obviously happens when the back wheels are not spinning at the same speed.
We performed an experiment. We raised the rear of the car so that the tires were 1.5" off the ground, and we removed the differential cover. We then started the car, and let the drivetrain do it's thing in 1st gear as we observed what was going on in the rearend. There were no problems. Then we took a 2"x4" and placed it in front of each tire to slow it down, or load it. When we did this on each wheel, hell broke loose and the carrier was knocking, bucking, jumping and clunking. Long story short, we initially thought it may have been an axle problem, but after our little garage experiment I am led to believe there is a problem with the limited slip differential itself. As it sits right now, the car is completely unfit for driving - you'd be better off riding a bull to work.
Has anyone else experienced this problem? Also, does anyone know what exactly is going on here, or am I not thinking about something obvious?
We performed an experiment. We raised the rear of the car so that the tires were 1.5" off the ground, and we removed the differential cover. We then started the car, and let the drivetrain do it's thing in 1st gear as we observed what was going on in the rearend. There were no problems. Then we took a 2"x4" and placed it in front of each tire to slow it down, or load it. When we did this on each wheel, hell broke loose and the carrier was knocking, bucking, jumping and clunking. Long story short, we initially thought it may have been an axle problem, but after our little garage experiment I am led to believe there is a problem with the limited slip differential itself. As it sits right now, the car is completely unfit for driving - you'd be better off riding a bull to work.
Has anyone else experienced this problem? Also, does anyone know what exactly is going on here, or am I not thinking about something obvious?
07-29-2006, 10:21 AM
#2
11 Second Club
iTrader: (13)
Join Date: Dec 2001
Location: Escondido, CA
Posts: 145
Likes: 0
Received 0 Likes
on
0 Posts
Been there, done that. Stock torsen posi is gone. One of the worm gears inside the torsen has broken, Time to replace the posi.
Nice thing with the torsens(if you can call it that) is the worm gears usuually go out and you can usually drive it home. My Eaton HD posi blew the spider gears out and took out the ring and pinion. If I were to replace the 7.5 posi I'd go with a HD torsen. I'm currently waiting for my S60 to show up.
Dee Jay
Nice thing with the torsens(if you can call it that) is the worm gears usuually go out and you can usually drive it home. My Eaton HD posi blew the spider gears out and took out the ring and pinion. If I were to replace the 7.5 posi I'd go with a HD torsen. I'm currently waiting for my S60 to show up.
Dee Jay
08-01-2006, 01:36 AM
#3
TECH Enthusiast
iTrader: (8)
Join Date: Dec 2001
Location: SE Florida
Posts: 543
Likes: 0
Received 0 Likes
on
0 Posts
I've got the exact same problem going on. I really can't complain though, I've beat the **** out of it for 5 years. What sucks is I had new 4.10's put in probably 3000 miles ago, and now the posi goes, and from the looks of it, it took the gears with it too. Even if the gears are still good, it's not worth the money to get it all replaced. The plan is a D60, might drop in a used 10 bolt in the mean time just so I can drive the thing.
08-01-2006, 09:14 AM
#5
My car does the same. I'm gettin a used 10-bolt & gears this weekend. The 10-bolt is outta a auto, so I'm gettin new 3.42's off a member on here to go with it. Then off to the rebuild shop. I found a shop in my town to do a complete rebuild for $260 & they will paint it black for free to help hide that old ugly lookin rusty stock axle a little better. I will be out like $400 in the end.
