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

Dave Read defender110 at ozemail.com.au
Tue Sep 6 14:28:07 BST 2005

Penrite make a light gear oil here in Oz.
It has the viscocity of ATF and the shear strength of hypoid.

I have used it in my Defender box for the last 5 years or so. No issues 
to date ...

Dave South Oz

> James
> 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
>>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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