[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
Hi
Peter
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 ...
Cheers
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
>>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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>
>
>
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