Installed 4.57R
05-11-2006, 08:10 AM
#1
Registered User
Thread Starter
Join Date: Oct 2005
Posts: 547
Likes: 0
Received 0 Likes
on
0 Posts
Installed 4.57R
Hey guys...
Pulled out my stock diff yesterday and installed the 4.57R from Stratocaster.
As soon as I took it up to about 40mph, I noticed a vibration... Around 45-55 it's really strong, feels like the rumble strips on the freeway, above 75 it's still there, but due to the frequency you don't feel it as much.
I've read that it could be inner cv but it seems like a bizarre occurence that it would happen the same time I swap differentials? Also heard that it's LSD? How likely is that?
I'm running 75w-90 Redline Gear Oil, and did the 3 heat cycles- though it's been making the noise since I installed it.
HELP.
Pulled out my stock diff yesterday and installed the 4.57R from Stratocaster.
As soon as I took it up to about 40mph, I noticed a vibration... Around 45-55 it's really strong, feels like the rumble strips on the freeway, above 75 it's still there, but due to the frequency you don't feel it as much.
I've read that it could be inner cv but it seems like a bizarre occurence that it would happen the same time I swap differentials? Also heard that it's LSD? How likely is that?
I'm running 75w-90 Redline Gear Oil, and did the 3 heat cycles- though it's been making the noise since I installed it.
HELP.
05-11-2006, 08:14 AM
#2
Registered User
Whoever told you it's the LSD is probably on some form of LSD (hehe), and should never be trusted. We have a no clutches in our LSD, only gears. If your LSD goes, heh, you'll KNOW it. 
As for the vibration, I'll let xviper or slowS2k offer suggestions on that. However, I don't think the diff itself would cause a "vibration", though it can cause a "whine" noise.
Also, try something other than redline. While we only have 2 UOAs of it so far, it breaks down very quickly, at twice the rate of mobil 1 and LE 607 diff fluids.
As for the vibration, I'll let xviper or slowS2k offer suggestions on that. However, I don't think the diff itself would cause a "vibration", though it can cause a "whine" noise.
Also, try something other than redline. While we only have 2 UOAs of it so far, it breaks down very quickly, at twice the rate of mobil 1 and LE 607 diff fluids.
05-11-2006, 09:08 AM
#3
Registered User
Originally Posted by Wisconsin S2k,May 11 2006, 11:14 AM
I don't think the diff itself would cause a "vibration"
but there's a bunch of things it could be. I would start by making sure you bolted everything down to the correct torque specs.
05-11-2006, 10:19 AM
#6
It could be the position of the drive shaft. I had a vibration like what you described and I moved my driveshaft a few holes and it was gone. You might try rotating your drive shaft and rebolting it to a different location. Try something that is 90* from where it is now. It's a balanced assembly from the plant and you might even see a small weight tacked to the driveshaft that is evidence of the previous balance. That's why in the helms it calls for marking the location of the shaft to the pinon and the axles to the spindles.
HTH
HTH
05-11-2006, 10:58 AM
#7
Originally Posted by glagola1,May 11 2006, 11:19 AM
That's why in the helms it calls for marking the location of the shaft to the pinon and the axles to the spindles.
Trending Topics
05-11-2006, 11:10 AM
#9
Originally Posted by Wisconsin S2k,May 11 2006, 12:08 PM
This would not have mattered. since he did a diff swap, if he'd done this, the markings would have been on his old diff and pinion flange, which gets sent back to Rick's. The new diff would have no such marks obviously. 
05-11-2006, 11:14 AM
#10
Registered User
i edited my post.
the output shafts do get put into the new diff. however, i think it's a moot point since they will not necessarily be the same position they were in the old diff.
as for getting the two to match up, can just those tiny half shafts really cause a vibration just because they aren't mated up the same way? FWIW mine and Keith's were never marked and they turned out ok.
the output shafts do get put into the new diff. however, i think it's a moot point since they will not necessarily be the same position they were in the old diff.
as for getting the two to match up, can just those tiny half shafts really cause a vibration just because they aren't mated up the same way? FWIW mine and Keith's were never marked and they turned out ok.