2001 FORD F-150 PICKUP, 4R70W

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T/C, VB exchange Valve body, reseal (was rebuilt by another shop 50K before)

Po 755 Shift Solenoid B fault
po 1715 shift solenoid 2 fault

Original Customer Complaint:
Neutrals 2/3 and sometimes no shift
Current Customer Complaint:
No 2/3 shift neutrals at times
Work Completed This Visit:
road test only
Summary:
cleared codes this morning. drove truck. all worked perfect for 5 miles or so...
then it set po755 and I had no 2/3 shift..(scanner shows B soleniod turns ON as it should) I pulled over cleared codes... drove away and code set right away... I stopped cleard code again and it set before I even drove off.... I stopped again shut truck off.. turned key on cleared code.. with truck idling in Neutral after about 15 sec. it set code po 755 with out even puting the truck in gear...IM wondering if this could be a computer issue???? any help would be great Thank you...

K so here is what I have done so far.... We checked solenionds, internal harness through case connector... seemed ok but replaced both just for S&G.....checked wire from controler to trans9B soleniod wire).. no open wire..no shorted wire.. installed differant VB no change... installed another valvebody with a sonnex solenoid reg. valve.no change.. I have done everything I can think of... ex. the controler/computer.. sometimes it will set the code with it just running in the shop in Neutal.. and this morning I drove it and it took 2/3 min before it set the code...when It set the P0755 code it shifts 1-2-2-1 on the quick test box..I have ordered a computer.. am I missing something?????just replaced computer and no differance. So I am going nuts... this thing will set the code PO 755 siting in the shop in park... I have changed VB, shift solenoids 2 times, internal wiring harness, check case connector. wire from trans to computer... tested solenoids through case connector Ohm's were within speck.. what anm I missing????????

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