Doug,
I just went thru this with my 4a IRS, and found a multiple of issues. Like
yours, the mounting for the diff was in perfect shape as I stripped the
frame bare and sandblasted it, then welded in supports and ensured the
mounting pins were the best they could be.
The dreaded rear end noise I found came from the following:
1. Excessive play in the right side sliding half shaft
2. Excessive play in the wire wheel splined hub adaptor
3. Some (hard to define "excessive" here) play in the diff itself. Certainly
isn't as tight as some of my other cars I've had, but not completely sloppy
either.
So I set about addressing each in turn. After much time and money, all were
the culprit. The wire wheel issue ended up being in the wheel hub and not
the hub on the car, but one wears out the other so looks like a good time
for chrome wires...
The sliding shaft was the biggest contributor. I didn't realize there was so
much torsion play when I assembled the drive train and suspension, it didn't
take much to get to the point of the dreaded IRS twitch. See Roger Williams
"How to Restore TR 4a" page 140.
Lastly, the bearings in the diff housing were shot causing slop in the stub
axles. Pretty easy to fix, just remember to fill the diff back up with oil!
Brian
'67 TR4a
____________________________________________________________________________
Message: 4
Date: Sun, 9 Mar 2008 21:12:26 -0400 (EDT)
From: dmnlaw <dmnlaw@peoplepc.com>
Subject: [TR] TR6 "Clanky" rearend
To: triumphs@autox.team.net
Message-ID:
<12181740.1205111546651.JavaMail.root@mswamui-backed.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
After placing my TR6 on the road this past December I have been driving and
sorting out various issues. I am now focused on the differential. When I
start in first or reverse gear (from dead stop) the differential clanks. All
u-joints are new. Differential mounts are in good shape also. With a tire
off I can rotate either axle about 5 to 6 degrees before the propshaft
engages. If I do it fast I get the annoying metallic clank. On the highway
all is fine - no whining, grinding or anything like that. Is this just a LBC
issue that I need to get use to or am I looking at a rebuild. Thanks.
Doug Nelson
74 TR6
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