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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / August 2007

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Rolls Royce Silver Shadow Gearbox will not select reverse

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cavendishlimos@aol.com - 29 Aug 2007 21:27 GMT
I have a 1970 silver shadow when i select reverse on the steering
colum it does not acutate the linkage on the gearbox. i have all
forward gears but no reverse or park would this be an electrical
fault. Have you come across anything like this.
N8N - 29 Aug 2007 22:11 GMT
On Aug 29, 4:27 pm, cavendishli...@aol.com wrote:
> I have a 1970 silver shadow when i select reverse on the steering
> colum it does not acutate the linkage on the gearbox. i have all
> forward gears but no reverse or park would this be an electrical
> fault. Have you come across anything like this.

I seriously doubt it; not sure about a '70 Roller but ISTR that many
of them used GM THM400 trannies made under license; any good local
tranny shop should be able to take a look at it for you.  I would be
very, very surprised if Rolls used an electrical servo arrangement to
shift gears, far more likely is a mechanical linkage or cable between
the column and the trans.  (I am guessing here; I have zippy
experience working on Rolls cars...)  Anyway, assuming that all my
assumptions are correct:

Option one would be that something has come loose or broken in the
mechanical linkage between the column and the gearbox.  That should be
relatively easy to fix although it might involve buying some Rolls-
specific replacement parts.

Option two is that something is hosed inside the transmixer.  Bad news
is that in that case you are looking at at least a partial teardown
and rebuild.  Good news is that if it is a THM400 it shouldn't require
any Rolls-specific parts and can be handled by any good transmission
shop.

good luck,

nate
cuhulin@webtv.net - 29 Aug 2007 23:51 GMT
Mrs.Bucket and her hubby Richard (Keeping Up Appearances) once
''borrowed'' a 1970s Rolls Royce car.I have never been near a Rolls
Royce before, but I once owned a 1962 Ford Falcon manual shift car and
one time something about the shift linkage got out of synch.I opened the
hood and I played around with the shift linkage under there.I don't
remember what I did, but I got it back in synch.
cuhulin
Chas Hurst - 30 Aug 2007 03:23 GMT
>I have a 1970 silver shadow when i select reverse on the steering
> colum it does not acutate the linkage on the gearbox. i have all
> forward gears but no reverse or park would this be an electrical
> fault. Have you come across anything like this.

Usually a trouble free part. It is a servo shifter, so there could be an
electrical problem at the shifter or the servo at the trans or the wiring in
between. I'd check the plug on the trans servo for a bad connection or
broken wires first.
N8N - 30 Aug 2007 13:42 GMT
> <cavendishli...@aol.com> wrote in message
>
[quoted text clipped - 9 lines]
> between. I'd check the plug on the trans servo for a bad connection or
> broken wires first.

Well whaddaya know.  This wouldn't be the first time I was wrong.

nate
 
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