[ROVERNET - UK] SD1 gearbox( Second part of James Dean's last post)

iudkuy wcygiohs iudkuy at yahoo.com
Mon Sep 5 23:01:09 BST 2005


I have recently acquired a TVR Griffith which has this
same box, the LT77. TVR first recommended ATF but
apparently it doesn't protect the fibre gears in the
oil pump which will obviously lead to failure. The
recommended lubricant is now Castrol SMX. This is
available in UK but not in Australia. However a
special version of SMX called SMX-O (for Opel) is used
by Holden (GM) dealers here for Astra gearboxes. I
have just started using this and the gear changes are
much easier. With SAE 90 gear oil it was very
difficult when cold.

I thought this may be of interestto SD1 owners.

Peter B

--- Kent Kinard <kkinard at swbell.net> wrote:

> Hi James,
> The gearbox is dead.  It should have been attended
> to sooner in order to 
> save it.  The TR7 box will do fine, but needs to be
> flushed and treated 
> after installation. It is not a Getrag and neither
> is the Jag box.  It 
> is a British Leland LT77.  Gear strength and bearing
> size were never the 
> problems.  The use of tapered roller bearings
> resulted in heavy center 
> bearing end loads and wear on the bearing that
> resides between the First 
> Motion Gear and the Manshaft.  Partial failure of
> this bearing causes 
> the clearance between the maninshaft gears and the
> countershaft gears to 
> increase putting greater strain on each gear tooth
> and eventual failure 
> of the sliding gears and the countershaft gears.
> Although it is not a 
> foolproof test, try to move the First Motion Gear
> (input shaft to 
> Americans) up and down with the trans out of the
> car. If the TR box 
> shows appreciable movement at this point, it may not
> be good either, and 
> at the very least needs a rebuild before
> installation.
> Roverly,
> Kent K.
> James Dean wrote:
>   He suddenly has a noise in first, second, third,
> but not 4th and
> > 5th. It sounds like it is coming from the gearbox,
> he says. When he 
> > jacks the car up and runs it, the noise goes away.
> Any ideas?. If it is 
> > a gearbox, I have a good TR7 gearbox. I have been
> told Rover used 
> > heavier bearings. An owner of a Tr shop told me he
> had a TR7 with a 
> > superpowerful TR8 engine, drives it hard, and has
> had no problem for 
> > years. He says yes, the bearings were changed, but
> it made no 
> > difference. What is the real answer?I know Vitesse
> SD-1's had hardened 
> > gears, but do not think regular SD-1 had that.
> Also, is this the same 
> > Getrag 5 speed Jaguar used on the 80-87 Series III
> XJ6 5 speed? The box 
> > looks almost the same, except the shifter. 
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