[6pack] TR Gearboxes

[Ruffner, James A *HS]

There are a few differences between the TR-3 tranies, and the later TR-4 and
on ones.  The biggest two are that the later ones have sychros in first, and
the countershafts ride on different types of bearings.  The counter shafts are
the weakest element in these transmissions.

The complete units are interchangeable up until they used a different ODs ("A"
type versus "J" type.)  The mounting lugs were different on the later ones,
but with a bit of ingenuity, it is easy to make a good mounting adapter.  One
of the popular mods for the TR-3s was to get a TR-4 trans and put it in the
-3.

>From what the you are describing it sounds like he broke a tooth on one of the
two 2nd gears (main one and the idler gear) and as the tooth dropped, it
whacked and chipped another tooth.  The "bang" was likely the tooth letting
go.

Biggest question: how does the car drive in 1st, 3rd, and 4th?  Does the OD
still engage?  If it makes the kind of noises you describe while in those
gears, it may not be the transmission at all, but rather the differential.
Sorry for your friend's problems.

Cheers.
________________________________________
From: 6pack-bounces at autox.team.net [6pack-bounces at autox.team.net] On Behalf Of
Bill Wellbaum [wcwellbaum at cox.net]
Sent: Monday, July 18, 2011 8:49 PM
To: 6pack
Subject: [6pack] TR Gearboxes

A friend with a '59 TR-3 encountered a loud bang (he said it resembled a
large
backfire) and the whole car shook while accelerating in 2nd gear.  Now, when
in second, he has loud clicking and growling sounds and when going round a
corner the gear lever rocks back and forth and the growling is worse.  He
said
he can get in and out of 2nd gear but the noises keep him from going there.
He got home ok and said there was no problem with 1st, 3rd and 4th.  He
didn't
try to engage the o/d unit for fear of causing more damage.

1.  Any suggestions on what may have happened,
2.  Are the gearbox cases similar for the TR-2-6 series of cars--or are they
all dramatically different?

Bill Wellbaum
Las Vegas

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