94 f350 trans problem

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Sep 8, 2010 | 08:16 PM

SoupCan™

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Joined: Jun 2009

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94 f350 trans problem

ok guys..i have a 94 f350, 4x4,7.5l with an e4od..the truck was beat pretty hard and then parked for about a year,i purchased it without being able to testdrive...anyway one of the repairs i had to do is the wiring harness going to the trans was all chewed up..while doing the brakes and front axle, i changed the trans fluid/filter, found no debris in the pan..now if i drive it, reverse works fine..but if i try to take off in drive it acts like its slipping...but if i start in 1st and manualy shift up..it works ok..and the same if i start in 2nd...i havent had a chance to check the mlps yet, but i did the self test that you do without it running, and got these codes 621,622,624,626,629,637 and 539...can anyone help? i am not sure if these were "stored" codes or not...

Rich

Sep 9, 2010 | 02:45 AM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,740

Likes: 2,669

From: SE Florida

All of those codes are electrical faults for circuits that are in the wiring harness going to the transmission. I suspect you didn't fix the wiring harness correctly. None of the codes are for the MLPS.