Thread: D2 V8 ZF auto shift pattern

Hi 4X4V8,

I haven't got a D2, but the ZF in my D1 happily sits in 4th gear around town. It will often hold onto 3rd when it's cold but once it has all warmed up it will drop into 4th.


Harvs.

I'm not tech enough with Transmissions to give you a reason.

BUT my D2 V8 auto does NOT sit in 3rd at 70km... so it looks like you may have a problem

Mark

Mine changes at 74kmh. I have spent some effort making certain of the speed point. It will change up if your going down hill with no revs though.

Its probably worth checking that it has enough fluid. When my ATF (same gearbox) is low, one of the first signs is that 4th gear gets locked out of use. Then it loses all drive.

Hmmm - I've got this ZF22 gearchange syndrome where, for example: I'm accelerating up the on-ramp (to fwy) in 3rd, it drops into 4th as you'd expect - but only for a split second and whips back up to 3rd again until I'm up over - now that you mention it - around 74 kph, then it finally drops into 4th.
This is all with constant pedal pressure, running warm - pretty much able to replicate whenever I like. The freeway on-ramp scenario happens to be a good enviroment to expose the issue.

It's been doing this for a while - before and after the 'rebuild' (which was just new primary friction band and one particular solenoid which was perhaps causing oil starvation) so it's not the fluid level.

The 3-4-3--4 problem I have may be a sticky solenoid too, like you say (edit) 4X4V8.
It wasn't something I had fixed at the time of repair as it wasn't what was stopping the car from actually moving. Hindsight is a wonderful thing.

Alternatively, I'll be online with Rovacom early next week (distributor, yay) maybe that will reveal a programming error rather than solenoid fault.


Hardy

The previous owner had the tranny serviced 1 yr and abt 5000km ago - the receipt mentioned nothing wrong, just a regular tranny fluid flush service. Car's done 111,000km now, and an old service receipt at abt 60?k km saw a tranny fluid change also.

I will check fluid this morning, that is obviously the first port of call, I was just jumping to worst case scenario... the tranny has a slight whine (not t/c whine) in 1st and 2nd gear as well so I'm a bit concerned about what probs this box may have. I'm hoping something simple - I had an Audi fitted with a similar ZF auto and experienced similar probs after switching to synthetic. Went back to good ol' Dextron II and it resumed normal transmission...

Very new to LR, but can anyone point me to how you can download fault codes yourself? Assuming the auto stores 'em, this is where I'll go next after a fluid check.

Okay, was able to get up to speed, and it changed up at around 75km/h and also then locked the torque converter. Wont upshift below this speed, though, not even on trailing or no throotle, the usual procedure.
Thanks for the input guys. Now I need to get this assessed by an expert

Just to answer your question regarding fault codes, the D2 has the electronic version of the ZFHP22, so at the minimum you would need an OBDII scanner.

My understanding is the G/box ECU decides when to make a shift based on shifter postion, mode selected (if available) and info received from EMS (engine) and BCU/BECM (speedo) ECU's. If any of the ECU's (incl G/Box) have logged a fault, then a scanner should pick this up and hopefully point to something that could be affecting the gear change.

Problem is OBDII scanners aren't exactly everywhere here in Australia. And it's not guaranteed they'd actually work with LR G/box.
I've been looking into this - found heaps on eBay from China and 50 million differant types in the US. I want to work out which is the best one for LR's and make available here for people like us.
Scanners can only read codes, not make changes - but this is cool because they're cheap(ish) and will either identify an exact fault or at least allow process of elimination by indicating what may or may not be causing the problem.

Yeah, see what the expert says...



Hardy