Hi, I'm considering buying a 4.0 Soverign, not Long, that I've been offered, it's cheap. Lots of small stuff to do. But what I worry about after a test drive is how harsh the transmission shifts. Strangely (to me) more so when hot. It's every gear when accelerating from standstill, feels worst 1-2. It feels like I'm driving over a bump in the road, first I thought it was that, until the "kick" was there on the next start also, and again and again.
The seller, a shop (the owner died), says they think maybe oil, filter and hardy(?) something. Oil looks nice and red, no bad smell. If it's the hardy, how come it's only felt when hot?

Any other similar experience, know issue?
Thanks

 

Pressure regulator , this was a common fault of the later ZF5HP24 used in the X308

The mode of failure in that case is too high fluid pressure going around the regulator and not through it . You want through it in your example

 

Thanks Parker 7

Is it visible in the drawing? Is it to fix without transmission out?
And is it consistent with almost no symptom when cold?

 

The pressure regulator would be from removing the lower trans oil pan and pluck out of module / valve body ( module should stay in place ) save the trans fluid or time for full fluid replace

When cold how the regulator effects the pressure.....................................

The fix on the ZF5HP24 was to remove the PR and ream up a size the module bore to receive a larger up sized PR and then it would seal and not let higher pressure bypass around and slamming the trans drums together

Doc coming for your ZF4HP24 , the 3.2 liter has the ZF4HP22 without the electronic shifting ( fluid logic )

89__zf_1_4hp22-24.pdf

For your 4 speeds and reverse there will be 2 or 3 shift solenoids to sequence them on / off chart located in manuals , maybe the PR is item # 431

 

This Jaguar manual better shows the PR position on the valve body which should be able to do with whole Trans still installed and no removal

powertrain - zf.pdf

 

G'day No Quarter,

I would go have a chat with a ZF auto transmission workshop, many cars in Europe have ZF gearboxes, and if possible take the car with you.

I had a similar problem with my car, although it has a GM 4L80E gearbox, and it was a problem with the gearbox valve body. A relatively straight forward repair.

Cheers,
Jeff.

 

FYI, It might be nothing to do with the autobox(but always worth checking and replacing fluids), it could be messed up front frame rear big bushes, driveshaft doughnut or box support bearing, rear hubs lower bearings. Any of these past their use by date and you'll get harsh shifting because too much movement and transfer into body of the car, which you'll feel as harsh shifting.

 

Thanks all, I now know what I could be facing. Price needs to go down. If I end up buying it, I'll probably be in touch :-)

 

The correct viscosity and type of trans fluid important as changes shift " feel "

Correct level as well , particularly the different trans ( General Motors ) used on the inline 6 supercharged Jaguar X300 model

May have put wrong in there but no way of knowing if the owner did a full fluids change

The same ZF trans was used on earlier same time frame BMWs and such and can get advice on those forums as a larger population / number of example cars

So your looking at the specific ZF4HP24 trans as the Orange color , you would better know the BMW model E numbers

 

OK, so I've now looked at another X300, or X306, an XJR. GM box, right? Shifts fine when driving, but when standing still on a slope, going from P to D, it rolls 1.5 meter backwards before Drive engages. Have no idea when fluid was changed. Fluid seem to be at right level, it's more brown than red, but no burnt smell.
Is this a better car to buy, an easier fix? Or a likely Transmission out?

 

That GM transmission does have issues with shifting denoted by an Orange dot on the data plate indicating the redesign to better

The supercharged model beside the higher price requires a higher level of maintenance / parts cost / specific parts araciality

The owners of the XJR version of X300 would certainly know more

More in a bit

 

Parker 7, More in a bit...? :-)

 

Let me think in the morning

specific parts availability like different MAF