Nooooo, gearbox is dying!

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Originally Posted by PerthDisco

What do you reckon TransmissionRUs would charge to do this work?

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No idea mate. Sorry. I guess parts plus about 4 hours labour? The trans fluid alone is enough. I’m going to do a triple flush with 20L of LG6. I’m switching back to LG6 after using an alternative. I’m not sure why other than I guess in the back of my mind I feel I might get more life from the box using it, but I can’t substantiate that at all.

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Originally Posted by loanrangie

DJ does the zip kit not include the orings for the solenoids ?

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The zip kit improves the oem design by having two o rings for each end of line seal. This provides much better sealing. The kit also includes new clutch valve cylinder as these wear out. Finally, the zip kit also contains the accumulators with springs that sit at the end of each valve. The oem rubber top hats fkatten out and cause the harsh shifts as theres no spring in the system. This in turn causes wear on the vb and transmission. If the actusl clutch paks and torque converter are in good shape, a rebuilt vb will def. Improve driveabilty.

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Originally Posted by Eric SDV6SE

The zip kit improves the oem design by having two o rings for each end of line seal. This provides much better sealing. The kit also includes new clutch valve cylinder as these wear out. Finally, the zip kit also contains the accumulators with springs that sit at the end of each valve. The oem rubber top hats fkatten out and cause the harsh shifts as theres no spring in the system. This in turn causes wear on the vb and transmission. If the actusl clutch paks and torque converter are in good shape, a rebuilt vb will def. Improve driveabilty.

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Having just fitted a Shift kit (TransGo) to my 6HP26 (Not a ZIP Kit which it should have been) The trans operates perfectly nice and smooth but I still have this problem:
On coast down for instance turning into a side road, if I accelerate to quickly as I straighten up I get a clunk (which seems to come from the diff) as if slack is taken up, it also happens in a straight line, if I delay the throttle a little its ok. I suspect a solenoid as I didn't replace them but it may be another cause. Any ideas would be appreciated. Nick

I think they all do that if you are coasting and hit the throttle..maybe just as the auto is down shifting. Our 8 speed does it occasionally..the TD5 did it more often.

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Originally Posted by Pippin

Having just fitted a Shift kit (TransGo) to my 6HP26 (Not a ZIP Kit which it should have been) The trans operates perfectly nice and smooth but I still have this problem:
On coast down for instance turning into a side road, if I accelerate to quickly as I straighten up I get a clunk (which seems to come from the diff) as if slack is taken up, it also happens in a straight line, if I delay the throttle a little its ok. I suspect a solenoid as I didn't replace them but it may be another cause. Any ideas would be appreciated. Nick

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Mine does it in such a way you can feel it. For me it's transfer case wear.. I've got one in the shed to put in when I get around to it. You need to drop shafts to isolate

Same here, to me its driveline wear. Transmission shift harshness is most noticeable if accelerating briskly, or downshifting in sport mode. The drivelibe is then loaded, so no freeplay like youd have when coasting and then applying power.

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Originally Posted by Eric SDV6SE

Same here, to me its driveline wear. Transmission shift harshness is most noticeable if accelerating briskly, or downshifting in sport mode. The drivelibe is then loaded, so no freeplay like youd have when coasting and then applying power.

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I think you are all on the money! I'll do some investigation and post my results. Thanks.

Hey jeffster, do you want to sell your new left over solenoids and left over valve body separator?

Also I changed my transfer case. Had to lube the splines anyway. Wasn't the TC. I bought it really cheap but. So I'm happy to have a spare at the price I paid.

My zip kit has arrived I'm now getting all the gear together to do a "mid life"
Solenoids, zip kit, gasket, oil, seals etc

Yes mate. I’ll PM you.

I see Sonnax is now listing the tooling for fitting oversize pressure control valves etc. This is the next step to prolong torque converter life

Checked my Penrite BMV filled ZF6HP28 the other day, after 40000km fluid still as new. Re- torqued transmission mount bolt to 175Nm, was about 1/2turn in it!