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

[Bill Gingerich]

Jim,

I've noticed the same type of "one wheel turns" situation on several cars.
To my understanding, it is normal.  It has to do with the ability of the
diff to allow the axles to turn at slightly different speeds as you turn a
corner.  I don't recall the specific mechanics that go on, but I wouldn't
worry about it.  My "unlimited slip" '99 F150 does the same thing.

Sorry, can't help you with the u joint question.

BillG
'74 Spit


-----Original Message-----
From: Spitfires [mailto:spitfires-bounces at autox.team.net] On Behalf Of Jim
Cullen
Sent: Monday, July 14, 2014 11:30 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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