Drive shaft balance and alignment are the two reasons I've seen for the
tailshaft housing to crack.B I've had this issue too.
Also check your mounting mechanism.B If you run solid mounts for the front
engine mounts ensure you use a solid mount for the rear engine mount.B
I solid mount the diff, gearbox and engine and after I switched from the poly
mounts on the rear/gearbox mount to a solid mount I haven't cracked a
tailshaft housing in 4 years.
aaron
#87 HP Spitfire 1500
Southern Illinois Region SCCA
----- Original Message -----
From: fubog1@aol.com
To: norlinengineering@comcast.net, Fot@autox.team.net
Sent: Sunday, April 19, 2009 1:21:07 PM GMT -05:00 US/Canada Eastern
Subject: Re: [Fot] Gearbox woes
Yes this is common, often caused by a driveshaft out of balance,
especially if you feel a driveline vibration at certain speeds.
HTH
Glen
-----Original Message-----
From: norlinengineering@comcast.net
To: Fot@autox.team.net
Sent: Sun, 19 Apr 2009 12:30 pm
Subject: [Fot] Gearbox woes
Well, my "woohoo" was premature.B B We broke a tailshaft housing on the
GT6
gearbox in our Spitfire.B B This happened last year as well.B B In the
past, I
remember tracing this to the nut on the output shaft working loose, but
I'm
pretty sure that isn't the case here.B B I will get the driveshaft
rebalanced
when I replace the housing.B B Has anyone else had this problem and can
you
recommend a permanent fix?B B Has anyone tried to strengthen these
housings or
add an intermediate mount or??
Thanks in advance.
Jim Norlin
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