All you've done is spark plugs and you want to swap the trans.....uhh.
Have you ever done more than just changing spark plugs in general?
If not...then -> Take it to shop!
Swapping just a trans isn't an easy task.......I can 100% guarantee that if spark plugs are all you have DIY'd....then a trans swap attempt is not a good idea!
There's a reason the shop wants $4500!
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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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