[Spits] Rear End Noise.... dumb question

[Quirk]

Hi Jim,

Google "spider gears" view associated pictures and you will see why one
wheel turns and the other doesn't.  It is that cluster of four gears that
allows for a difference in speed between the rear wheels as you turn corners
or loose traction and spin one of the rear tires.

With respect to your knock if it is irregular and happens over bumps etc.,
it could be from anything that moves with or comes in contact with the
suspension.  If it is regular and occurs at the same frequency as wheel
rotation it should be in the driveline between the differential and the
wheel rim.  If it is regular and occurs about 4 times each wheel revolution
then it is in the driveline from the differential forward to the
transmission.

....Spitman....

-----Original Message-----
From: Spitfires [mailto:spitfires-bounces at autox.team.net] On Behalf Of Jim
Cullen
Sent: Monday, July 14, 2014 10:30 AM
To: spitfires at autox.team.net
Subject: [Spits] Rear End Noise.... dumb question

Hi listers.....

I wonder if I could get some insight/advice on a knocking noise that seems
to be coming from the RH side of my rear end. I notice it more @ once I get
up to about 50 km/hr, especially over bumps (to the point I thought it was
the shock absorber and replaced that to see if it disappears as it seemed to
sound like the shock absorber was bbottoming outbb unfortunately, no joy
there), and when making left turns. After doing some research (see link b
http://www.britishcarforum.com/bcf/archive/index.php/t-28039.html) I thought
it might be the uv joint for the RH driveshaft (note that these were
replaced relatively recently, but from reading the experiences of others the
relative bnewnessb of the driveshaft may not preclude the uv joints of the
driveshaft from being the culprit).

I have the car now jacked up and have done an inspection of the uv joints. I
donbt see any evidence of play in the uv joint and the circlips on the
joint appear tight. Is there a better way to diagnosis the uv joints a
possible issue? I thought I should check the propshaft uv joint too, but
this seems okay too.

Here is my dumb  question, with the car jacked up and in neutral when I hand
turn the prop shaft I note the LH side drive turns in unison with the
propshaft, but the RH side doesnbt (it lags or doesnbt turn). I know I
should know if this is an issue, but despite having this car for close to 20
years and doing most of the work on it myself (as well as being an eager,
but novice mechanic) I essentially know very little about the differential
(other than what I learned from the Haynes manual and from when I replaced
the driveshafts a year and a half ago). So, my dumb question is two
part..... is what I bdescribedb normal? if no.... could it be the source
of my rear end noise (differential needs to be replaced)? I hesitate to name
the differential as the culprit, because most of my research seems to
suggest differentialbs donbt knock like mine is (they bwhine), but given
my novice intelligence about differentialbs Ibm not really sure. Anyhow, I
would appreciate some insight

Thanks for the help,

Jim Cullen
1974 Spitfire
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