What year car (tranny) are we talking about? 98+ 4R70Ws had some major advantages compared to previous years... Also, what mileage?
2-3 shift is related to the direct clutch. It's possible this clutch burned up, but then you would have no 3rd or 4th gear... :p
But it could also be torque converter (TC) shudder. You would feel a "rumble" when it shifts. It starts in the 3-4 shift (if she ever saw that shift: it occurs at about 95+mph if overdrive is off
), then you would notice it in the 2-3 shift. Basically, it means the TC is getting to hot and burning up the fluid. Probably can be fixed by using Mercon V fluid. Might also need additional transmission fluid cooler.
FLASH = 98 V6, chrome yellow, black & blue accents, 146k daily driver POWER
: divorced exhaust with glasspacks; BBK CAI, TB, UDPs; (shift kit in the garage) STYLE
: black headlights, black taillights, black grille, black hood pins, black window tint, blue hood & side scoops, blue billet fuel door, interior billet, 12000k HIDs RIMS
: XXR 006 black spoke with blue lip; 18x8.5 front, 18x9.5 rear TIRES
: BFG KDW/2 245/40R18 front, 275/35R18 rear