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Author
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Topic: big jerk at the rear
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mikel3891
Gearhead Posts: 111
From: philippines
Registered: Sep 2005
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posted 01-17-2006 09:01 PM
 
Hi. My 68 has a 9" differential with posi trac. When I start the car in the morn, it runs smoothly. But when I run it about a mile, I start to feel a big jerk occasionally at about every 5-10 seconds at the rear of the car. It's like being bumped or a little at the back by another car. Anyone encountered this problem? Is it a rearend problem?
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68 Coop
Gearhead Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 01-17-2006 10:06 PM
What's the transmission fluid look like, and is it an auto or standard???------------------
William 68 Coupe
289
C4
2:79 rear gears
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exlocal
Gearhead Posts: 1552
From: hacienda hts., CA, USA
Registered: Dec 2004
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posted 01-17-2006 10:58 PM
My money's on a slipping slush box.------------------
reliving youth
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rcodenewf
Gearhead Posts: 151
From: Manitoba, Canada
Registered: Jan 2002
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posted 01-17-2006 11:14 PM
A clutch plate problem maybe in the diff?
Do you have the friction modifier in there?
Recent rear diff work?
Just my .02
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mikel3891
Gearhead Posts: 111
From: philippines
Registered: Sep 2005
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posted 01-18-2006 03:46 AM
it is an auto transmission with new fluid.
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mikel3891
Gearhead Posts: 111
From: philippines
Registered: Sep 2005
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posted 01-18-2006 03:51 AM
I haven't had a diff in a long while. I'm sorry I'm not an expert mechanic but what is the slush box?
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exlocal
Gearhead Posts: 1552
From: hacienda hts., CA, USA
Registered: Dec 2004
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posted 01-18-2006 08:57 AM
quote:
Originally posted by mikel3891:
... what is the slush box?
Sorry, it's just my terminology of an automatic transmission. Back to the topic, maybe it's a vacuum leak causing the tranny to try and shift erradically. ------------------
reliving youth
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