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Author Topic: Posted in tech but no answers.. Smoked50 ¯ Member # 9592 posted                              Quick question, I currently have a 4R70W tranny in my car. Would I need to change the ecu in order to run a 4R75W which came in the automatic Mach 1's? -------------------- 1993 4 Cyl - 68 RWHP I live my life a quarter mile at a time. For those 25 seconds or less, I'm free. Posts: 2262 | From: EB | Registered: Nov 2009  |  : 98 ROUSH ¯ Member # 10309 posted                              I know if you threw a 5 speed in it you do. -------------------- Built 2v Stroked, Cammed and Blown Advanced Auto Built & Kurgan Tuned Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010  |  : BTLD GT ¯ Member # 5229 posted                              check now -------------------- 2000 Cobra R Posts: 558 | From: livermore | Registered: Jan 2005  |  : VendicatedSN95 ¯ Member # 10671 posted                              Not from what I understand. they are pretty much the same trans different pistons, added the tss sensor etc. Posts: 139 | From: The Bay | Registered: Feb 2011  |  : notch_306_stang ¯ Member # 7266 posted                              You may need a new harness for it or wire up the second speed sensor it has -------------------- ~HighSpeed Motorsports~ 02 f-150 Harley 91 GT drop(sold) 89 Lx hatch(sold) 92 LX drop(sold) 87 Notch blown(sold) Posts: 224 | From: Redwood City | Registered: Nov 2006  |  :

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