Very slight noise from rear end 944 NA
09-02-2010, 10:43 AM
#1
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Very slight noise from rear end 944 NA
Hi all,
We have been putting miles on the '86 944 that I dragged home for my daughter (after belts and everything) and I have noticed an odd noise that is very very hard to describe. I think is from the limited slip diff and maybe it's normal?
When pulling away from a dead stop and turning left or right there is a kind of shudder/grunch/grumble from the rear. It can olny be heard slightly when the window is down. Only I hear it my daughter does not. This sounds does not happen when pulling away straight. only when turning from a dead stop. It's not from the front only the rear.
Does the LSD make this sound normally?
I will change the oil in the trans/rear this weekend with a mobil1 synthetic just in case the oil is shot after 25 years and 117K miles.
What do you think??
We have been putting miles on the '86 944 that I dragged home for my daughter (after belts and everything) and I have noticed an odd noise that is very very hard to describe. I think is from the limited slip diff and maybe it's normal?
When pulling away from a dead stop and turning left or right there is a kind of shudder/grunch/grumble from the rear. It can olny be heard slightly when the window is down. Only I hear it my daughter does not. This sounds does not happen when pulling away straight. only when turning from a dead stop. It's not from the front only the rear.
Does the LSD make this sound normally?
I will change the oil in the trans/rear this weekend with a mobil1 synthetic just in case the oil is shot after 25 years and 117K miles.
What do you think??
09-02-2010, 06:30 PM
#2
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Are you sure the car has an LSD?
If so, maybe the PO has the wrong gear oil in there. It will shudder on turns if it's the wrong oil. I use Redline 75W90 for my LSD.
If so, maybe the PO has the wrong gear oil in there. It will shudder on turns if it's the wrong oil. I use Redline 75W90 for my LSD.
09-02-2010, 08:21 PM
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I'm only as sure as the info I can gather. I submkitted the VIN to Suncoast for a breaakdown and this came back for options:
158 220 425 431 454 456 533 650 946
MNR Type Description
158FRADIO BLAUPUNKT MONTEREY SQR 23
220FSPERRDIFFERENTIAL
425FHECKWISCHER
431FLEDER-SPORT-LENKRAD D.363 (4-SPEI.)
454FAUTOM. GESCHWINDIGKEITSREGULIERUNG
456FSTABI + SPORTSTOSSDAEMPFER VO+HI
SPERRDIFFERENTIAL = Limites Slip.
I will change the oil and see what happens.
533FALARM-ANLAGE INTERVALL
650FDACH ELEKTR.VETRSTELLBAR
946FTEILLEDER-SITZE (NUR BEZUG)
158 220 425 431 454 456 533 650 946
MNR Type Description
158FRADIO BLAUPUNKT MONTEREY SQR 23
220FSPERRDIFFERENTIAL
425FHECKWISCHER
431FLEDER-SPORT-LENKRAD D.363 (4-SPEI.)
454FAUTOM. GESCHWINDIGKEITSREGULIERUNG
456FSTABI + SPORTSTOSSDAEMPFER VO+HI
SPERRDIFFERENTIAL = Limites Slip.
I will change the oil and see what happens.
533FALARM-ANLAGE INTERVALL
650FDACH ELEKTR.VETRSTELLBAR
946FTEILLEDER-SITZE (NUR BEZUG)
09-03-2010, 10:18 AM
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I wish you could better describe the sound. I am in a similar predicament. I have been hearing an odd sound from the rear of my car, more of a clunk or grumble and the guys on Pelican forum said CV joints. My CV joints were done 9000 miles ago but on their sayso, I pulled and redid the CVs, (3 done 1 to go) and everything is good so far. If the 4th CV today passes the test, I will be without a clue as to the problem. I will then change the oil in the diff. but...
