I have an 06 F250 6.0 with 85,xxx miles on her. The truck always shifted fine when it was stock, but now that i run Gearheads Performance SRL XX tune the truck shifts funky from 3-5. Let me be very specific here... it shifts firm, but it jerks the truck back and forth. Almost the same feeling of...

2005 F350 KR CC SR 4x4 with 165,000mi Transmission shudders in reverse most of the time and the reverse gear is very weak. As in I can barely back into my driveway weak. Also, when shifting from 3rd to 4th (though I've read it's actually 5th) the RPMs run away and then SLAMS/BUCKS into...