Cost & difficulty of transmission valve body replacement...
Been searching through the threads to figure out what the deal with my transmission is, and it seems like it is the valve body. I have a hesitation/thunk on some downshifts, and it jolts the vehicle pretty well. It is not all that easy to duplicate.
Two questions: what would I expect to pay at the dealer, and how difficult is it to do myself? I don't yet have a repair manual set (truck is new to me) but I can spin wrenches well...
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The valve body is a litte over 1k. They have all the parts separate from sonnax now to update and fix issues but that is prolly beyond most peoples ability. I have not torn one down yet and don't know what modifications are necessary for updates yet. The factory valve body is a bolt in. I can send u service procedure if u want. Just drop pan, pull off valve body and put back together. Then fill her up and go. If u have scan tool u can reset shift adapts so it will learn faster. Dealer would prolly want 2500 to do it with all the fluids etc. They get 40 a quart, prolly 1k labor.
Here is a rebuilt Valve body that has all of the Sonnax updates that echerbst mentioned above. http://www.makcotransmissionparts.com/P15740-1.html
So with this valve body it will be a plug & play. There is a special procedure to fill the oil. You fill it through the periscope fill hole then start it up with the plug out and start filling again as the pump sucks up fluid out of the pan. When it gets up to temp (I think around 40'~45'C with the fluid just dripping out of the fill plug (engine still running) then you put the plug in.
I have the clunk - as unnerving as it is... is it an actual problem or just a nuisance? Will driving it with the clunk cause the transmission to degrade further? I don't like the clunk but since the repair is expensive - I'd like to figure out how damaging it is. Any input appreciated. thanks.
Well I Think that these clunking can't be god for transmission. If you have some mechanical knowledge, and place where to do this, somewhere, where can you lift the car, coz I can imagine to do that on the floor, it's pretty easy DIY job.
True, it's pretty expensive job, but believe me, its worth every penny.
Just had mine done on an '06 S Ti Ed. and it was $2500 at the dealer. I didn't have the clunk, but the valve body was leaking fluid onto the wiring harness which was sucking it up to the controller via the cloth wiring wrap.
Location: A Swede in the Canary islands, Spain (on the African coast)
What to do
I have a client who has purchased a complete gear box from an Cayenne S 2006 to swap the for the original one in his 2004 model.
Does anybody know if this is possible to make with out mayor problems or is it enough to swap the DME box?
I have the car sitting in the work shop and I don't know if it's a good idea!
But as he purchased it cheap at the local junk yard....
I believe the only difference is the transmission control unit and valve body got very minor updates. So you either use the 2004 valve body and tcu or a newer set.. but they have to be mated IIRC Gear box should be unchanged through those model years.
My newly acquired Cayenne was suffering from harsh down shifts mostly from 4-3 but sometimes 3-2 (under load). After researching all the options I decided to order a rebuilt valve body from http://www.revmaxconverters.com/
The order was shipped out within a day and when the valve body arrived it looked like a new part and they also include a return shipping label. My mechanic did the change but I supplied the valve body, parts and trans fluid (I went with Mobile 1 ATF 3309). The total cost ended up being just under $1200.
The transmission now shifts MUCH smoother with no harsh down shifts at all.
Revmax also processed my core charge refund within a day of receiving my old valve body.
If you need a valve body I would recommend Revmax.
04 Cayenne S
91 Mercedes 420SEL
One problem with buying a new valve body if you have a early Cayenne is it does not have one of the sensors on it. It works but you need to buy the updated control module and have it programed at the dealer.
With the rebuilt units it is just a swap.
04 Cayenne S
91 Mercedes 420SEL