im having a hell of a time getting my jeep running right.
i have a 2001 that i bought with a blown trans, so i threw a trans from a 91 in it and its running off a 95 tcu. and with the tcu connected i get 1st, 2nd, 3rd and 3rd w/lock up, but it stays locked in 3rd when i let my foot off the throttle (engine breaking) until about 1200 rpm.
with the tcu unplugged i get 1st in 1-2, 3rd in 3, and see maybe 200 rpm drop at 70mph in D. No lockup, and rpms drop like they should when i close the throttle.