So ive had the dreaded cow grid shudder in my 2008 RR Vouge 3.6 v8 and did a quick fix last year by changing the transmission oil and putting in mr tranny additive. A year on and 9000 miles later its slowly comming back, so I have decided to change the Tc. My dilemma is cost, is it best to buy a TC for £870 or £350. Both are guaranteed 12 months, why the difference in price.