A rumbling noise when you back off the gas sounds like driveshaft u-joints
to me. Have the driveshaft checked out and balanced by a shop. Not expensive
and a good noise reducer overall. Drive the car along real slow in first
gear and have someone walk alongside. If they hear an occational metallic
popping noise coming from under the car, especially going from forward to
reverse and vice versa, I'd say its the u-joints.
Paul Bauman
Westminster, CA
67 1600
-----Original Message-----
From: owner-datsun-roadsters@autox.team.net
[mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Matthew Smith
Sent: Tuesday, November 01, 2005 4:00 PM
To: datsun-roadsters@autox.team.net
Subject: The first of a several questions
Hi All,
I have now had my drivers license back for a week, and am finding MANY new
things I need to ask. The first of which is a VERY scary noise coming from
the rear of my car.
Loreli has developed a (potentially) horrible noise from the rear end. This
usually happens in 3rd, 4th, and 5th gear. At first, I thought it was just
back-rap from the header/exhaust. It seems that when moving in gear, under a
reduced power, as in slowing down or going downhill with my foot off of or
lighter on the gas, I hear a rumbley noise from the back of the car. I
noticed this first when driving from Chattanooga to Nashville this weekend.
I did have the car well over the speed limit a couple of times on this 2 =
hour run. (110 at one point). My first thought was the normal back-rap from
a semi free running exhaust on a standard transmission. This doesnt seem to
be it. When I backed out of my parking spot at Starbucks, I heard a TERRIBLE
grinding noise from the rear end. Bad enough that I had to stop and jump out
to see what was wrong. (at the same time I got into a great conversation
with a Gentleman from Nashville who once had a 66 1600 that he bought from a
friend who was a Datsun dealer in Nashville. They flew the dealers private
plane to New Orleans to pick the car up directly from the ship from Japan).
Tomorrow I plan to take Loreli to the lube shop to check the oil in the rear
end, but I wondered if anyone else has heard this very expensive sounding
noise. I grabbed the drive shaft (not an easy feat for a guy over 275
pounds) and wiggled it. Doesnt seem to be u-joints, but there is a fair
amount of play in the driveshaft. (probably more than an 1/8th of an inch in
each direction. Any ideas?
Matthew A. Smith
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