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morghen · Joined: 21 Jan 2005 Posts: 9102 Location: Romania

So...i was driving nicely at about 150km/h and i was just doing a WOT thing going up a hill...when i hear this grinder noise.

i let go of the pedal...i press it again..there goes the grinder noise again.

i slow down...park...look at the engine...all running nice and smooth..everything at its place.

i go to the back..look at the gearbox and driveshafts..they look intact.

i try to drive it..a clonking noise seems to come from the back when the car is in gear and rolling.

to have it towed..i'd have to take the front bumper off...to have it on a platform costs way to much...and i figured: whatever let go...needs replacement anyway...so i've put it in first gear and slowly rolled home...clonking all the way.

my first thought was that one of the screws of the TT cuplor got unscrewed and was hitting the TT case as the main shaft rotates...but a close inspection revealed that those screws are ok and tight.

it shifts easly into all gears as before...its just when rolling in gear it makes this clonking noise and i can feel the vibration given by the rotating object that colides with something else.

i say the differential let go....any predictions?
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Grenadiers · Posted: Thu Aug 19, 2010 10:26 pm Post subject:

Had a similar experience in a 1973 Chrysler Newport, a big boat by anyone's standards! Made a horrible noise from the rear-end when accelerating, not much when at crusing speed. Tore apart the rear axle, and the pinion gear lost a couple of teeth. One lost tooth might not make as much noise but two consecutive ones do!
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'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

morghen · Joined: 21 Jan 2005 Posts: 9102 Location: Romania

plan is to open the oil drain plug and check for metal bits there
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ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Any chance it's just a bad CV? Maybe one of the bearings got worn so bad it's popped out of it's race? Lowered car height will put the CVs at a more acute angle and could induce add'l wear.

Just trying to be optimistic for ya!

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erstwhile owner of just about every 924 variant ever made

morghen · Joined: 21 Jan 2005 Posts: 9102 Location: Romania

Fifty50Plus · Posted: Thu Aug 19, 2010 11:09 pm Post subject:

I agree with Dave. I broke a tooth off the ring gear in 356 Porsche gearbox and it made a clunk, clunk, clunk sound when rolling. It was louder under accelleration.
Pull the drain plug and look for scrap metal.
Chuck
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1979 924 NA race car H-Prod SCCA
1982 924 NA race car - Sold
1981 924 Turbo sold
1982 924 Turbo sold
1972 911 E race car - traded for Cayenne Diesel
1975 914 1.8 Building for H-Prod SCCA

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

morghen · Joined: 21 Jan 2005 Posts: 9102 Location: Romania

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

I've got a 951 LSD box crated and ready to ship. . .shipping might be a bear, tho.
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WeiBe (1987 924S 2.5t) - 931 S3

emoore924 · Joined: 13 Apr 2004 Posts: 2822

morghen · Joined: 21 Jan 2005 Posts: 9102 Location: Romania

not interested in repairing the old gearbox..it has a worn 2nd gear syncro that always annoyed me so i'm happy it is dead...i was planing to replace it anyway since quite some time now..

i dont know Rasta...can you get a quote of shipping to RO?
i dont remember the price you asked for that gearbox..PM me again please.

i've got a deal for a NA 944 unit for 400 euros...shipped.

if you can go anywhere near that...i'll wait the extra 2-3 weeks it takes to come from the USA to europe and RO.
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