Our local shop will rebuild one for about $875 all said and done. Very good price! They did a full seals replacement for my dad on his 314k trans....$280 and took less than 2 weeks. They said the trans was still in excellent shape inside but did not look like it had ever been opened up before. (at 314k!!!) It does shift beautifully......I hope mine lasts that long too!
I had mine re-sealed by the dealer (or whoever does theirs) back at 213k.....its been perfectly fine since then.....I change my fluid every year too....I'm trying to make it last forever! 
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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