UWBadgers27
Active Member
- Joined
- July 30, 2010
- Messages
- 79
- Reaction score
- 0
- City, State
- Menomonee Falls, WI
- Year, Model & Trim Level
- 2001 Ford Explorer Sport
In june I did a SAS and a SOA in the rear. I put in a ford 8.8 with 4.10's in the rear. I had a loud vibration/growl coming from the rear end above 40 MPH. It would vibrate when I was about 3000 RPM and I could hear a chatter when I would roll down my window when I was coasting. I thought my driveshaft was to short and the vibration was caused from the teeth, in the slip portion, not having enough contact, so I got the driveshaft lengthened. It also would shudder and shake my truck from a dead start until I got up to about 10 MPH (this might be from the mud tires).
That didn't fix my problem at all so I noticed my pinion angle was off. So I bought some 8 degree shims and put those in along with dropping my AAL out from the rear. Now it vibrated differently. It would vibrate/growl at mid throttle, but it would go away when I would get on it. If I let off the gas it did the same chatter thing but now it had more of a vibration to it.
In October I started noticing a ping noise every time I would reverse into my parking spot. It would ping as soon as I gave it gas when going in reverse. It would do the same when I would pull out.
So now I realized my pinion angle was to perfect. It was right at 0 degrees. I pulled the shims out and put in 6 degree shims for a 2 degree offset to accomidate for axle wrap. Now that changed the occurence of the vibration. Now it vibrates/growls just over 30 MPH or faster when I push the gas pedal in JUST enough to open the throttle. Its pretty loud in the truck but as soon as I would give it just a little more gas it would go away. Now when I coast it vibrates a little more intensley and it still chatters.
Possible things wrong that I've researched
1) U Joint - The U Joint's on the rear driveshaft are only about 2 months old but I ran it with the angle at 0 degrees for awhile so I'm wondering if that wrecked the U Joints. That also can cause that ping noise that I'm hearing resonating through the driveshaft.
2) Excessive Backlash - It also could ping from the pinion hitting the coast side of the teeth and then pinging off the drive portion of the teeth. That would also cause vibration too but I'm unsure because I've never experienced this before.
3) Bad pinion preload - most people say that this isn't it but it seems like the next logical possibility
So anyone got a guess or an answer from previous experience? I'm just tired of guessing wrong and I need to get this fixed. So someone... anyone... Please help!!!!
That didn't fix my problem at all so I noticed my pinion angle was off. So I bought some 8 degree shims and put those in along with dropping my AAL out from the rear. Now it vibrated differently. It would vibrate/growl at mid throttle, but it would go away when I would get on it. If I let off the gas it did the same chatter thing but now it had more of a vibration to it.
In October I started noticing a ping noise every time I would reverse into my parking spot. It would ping as soon as I gave it gas when going in reverse. It would do the same when I would pull out.
So now I realized my pinion angle was to perfect. It was right at 0 degrees. I pulled the shims out and put in 6 degree shims for a 2 degree offset to accomidate for axle wrap. Now that changed the occurence of the vibration. Now it vibrates/growls just over 30 MPH or faster when I push the gas pedal in JUST enough to open the throttle. Its pretty loud in the truck but as soon as I would give it just a little more gas it would go away. Now when I coast it vibrates a little more intensley and it still chatters.
Possible things wrong that I've researched
1) U Joint - The U Joint's on the rear driveshaft are only about 2 months old but I ran it with the angle at 0 degrees for awhile so I'm wondering if that wrecked the U Joints. That also can cause that ping noise that I'm hearing resonating through the driveshaft.
2) Excessive Backlash - It also could ping from the pinion hitting the coast side of the teeth and then pinging off the drive portion of the teeth. That would also cause vibration too but I'm unsure because I've never experienced this before.
3) Bad pinion preload - most people say that this isn't it but it seems like the next logical possibility
So anyone got a guess or an answer from previous experience? I'm just tired of guessing wrong and I need to get this fixed. So someone... anyone... Please help!!!!