Hi All. Fairly new development to my ' 99 -55k XK8 4.0.


Has anyone of our techie guys used a conditioner when servicing your transmission.


Once in a while after repeated stops ( signs) my 5 spd auto has jumped out of 1st gear for a split second. Seems like it could be a low fluid or a sticky valve in the valve body. I am hopeful its to poor fluid.


As its a little involved I have a Jag technician ( who doesn';t believe conditioners are worth while) going to service the trans this week.


Like to have your input. thank you all as usual. U help my keep my tiger going. Rich

 

Jaguar is very clear in it's view of additives. Never, ever of any type. Most will do more harm than good, but if it does help it's merely a band-aid covering up deeper problems.

 

If he's going to drop the pan and change the filter it would be worth the additional hour to remove the forward valve body and inspect for cracks/wear, then replace the control valve with the updated version.

http://jagrepair.com/images/AutoRepa...%20ZF5HP24.pdf

 

A fluid change might just save it. Any 'conditioner' is likely to be just an additional expense before ensuring a transmission rebuild becomes necessary.

Graham

 

My cat is going in this Thursday for a transmission service to a really good Jag Tech. I am hopeful for an improvement . I too think the fluid may be a little old and tired and a new may help valve body lubrication. Rich

 

Most transmission conditioners are really a kind of thickener, which makes you feel like your trans is shifting more smoothly. In actuality it is just slowing the clutches from going together, after the drum is pressurized. If there is a sticking problem, it gives the valvebody a little more reaction time.

Since your trans is electronically actuated, it won't really do any good. There used to be a conditioner I did use, and it wasn't simply a thickener. It actually made the fiber discs a little rougher, so they engaged the steels better......

I did use a half bottle of thickener in my X Type, because driving that AWD during the winter really abuses that trans, at the forward differential, and the trans fluid is real thin......be cool.....Mike