1989 jaguar XJS GM trans

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camcbride8 - 02 Sep 2008 06:23 GMT

Hello I have a 1989 Jaguar XJS V12 I believe the trans is a GM
hydramatic 400.I am having trouble with it shifting,It doesn’t shift
from first to second unless I go 55mPH and the RPM’s get up to 5,000
and when it shifts it shifts hard,I noticed trans fluid in the Vacume
line to Modulator on trans I changed the mod and it is still shifting
hard at high rpms the fluid looks good nice and red no burnt smell and
level is good does anyone know whats the problem
thanks

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MoiInAust - 02 Sep 2008 07:57 GMT

There should not be any fluid in the vacuum line. I think the modulator
valve has failed. Sekk other opinions though. This is from memory with a
much less specialised car...

> Hello I have a 1989 Jaguar XJS V12 I believe the trans is a GM
> hydramatic 400.I am having trouble with it shifting,It doesn't shift
[quoted text clipped - 4 lines]
> level is good does anyone know whats the problem
> thanks

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