hopkinsd21

Still following to see what happens here.

Before a complete rebuild, start with the clutch discs. We had the transmission failure sign on our S7. We did not have the surging or 1st gear issue, but we had the shuddering and some hard slamming style shifts happening and the way it would crawl from a stop was concerning too.

Got told to do a complete trans rebuild.

After lots of research, I went after the clutch pack first. Literally solved everything in the trans department. After 6 months to ensure all ways good with the trans, went with APR TCU, so much better, so much smoother.

Just some thoughts here

I see very few with anyone solving anything with a mechatronics units and adaptation.

Kentuckyjr

Thanks!

Avantly

Mak Trans in poland rebuilds the OEM solenoids and does sell refurbished mechatronic units FYI (as well as other parts) so that is one possible good source for hard parts if you need them. Last I checked their prices on the mechatronic units was pretty decent.

Steve Trac, Sec 303

@Kentuckyjr any updates?

Kentuckyjr

I ended up cancelling my diagnostic at the independent repair shop and decided to part ways with the car. I sold it car to Carvana about 2 weeks ago. I was able to eliminate the surge by driving in manual mode and down-shifting to 1st gear before I fully stopped. This somewhat re-enforced in my mind that the trans was getting hung-up on the 2-1 shift when in automatic mode. I concluded it would need a re-build or new trans and didn't want to deal with it.

Mister Mike

Kentucky, just curious, what did you buy to replace the S7?

Kentuckyjr

After having the issues I was having with the S7 at 75K miles, I decided to go with reliability over performance and chose a Lexus LS500 F-Sport. Fun factor is definitely down, but no regrets at this point.

Steve Trac, Sec 303

One way to deal with it! Good luck with the new car!