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

[Donald H Locker]

Besides checking what others have recommended, also check that the trailing link is secure at both ends and that the body where the link attaches is not cracked. (Don't ask how I know.) This can cause a knocking sound whenever you hit a bump or when powering up or down.

The diff behaviour sounds normal. If the prop shaft is prevented from turning, the wheels will turn in opposite directions from each other. (Turn one forward one turn, the other will turn backward one turn.)

Donald.

----- Original Message -----
> From: "Jim Cullen" <ccullen16 at cogeco.ca>
> To: spitfires at autox.team.net
> Sent: Monday, July 14, 2014 12:30:04 PM
> 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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