View Full Version : superduty transmission question

03-10-2007, 04:54 PM
i have an 00 F550 with the 7.3L in it and she drives and shifts perfectly until it has to go into 4th gear., it wont! i took it in and they said its probably a simple o-ring that let go inside but by the time the ripped the whole tranny apart they just rebuild them. if it was the oring it would be over $1000 and to rebuild stronger than oem is $2600. my real question is i heard there is some valve/senser/whatever part that might cause this but i never really found out, anyone have any impup its appreciated

03-10-2007, 07:12 PM
Same problem with our "new" 2001 F550. Ours was the overdrive button/mechanism was faulty. Dealer repaired under the used truck warranty.

Gravel Rat
03-10-2007, 07:36 PM
If you get a transmission get one that is upgraded and heavier parts installed because the 550 is going to eat up automatic.

03-10-2007, 08:25 PM
id honestly say go with a good rebuild. build it up to handle anything. but yes theres sometimes a spring in the valve body that will get misplaced and that can very well cause it, or there could be some shavings in it making the valves stick. it could be a number of things, theres so much crap in an auto trans! also definately try the overdrive button.

03-10-2007, 08:58 PM
thanks guys, i definately tried the OD button route, not that. the shop i took it to had it plugged into the computer on the road test and they manually put it in 4th gear but it stayed in 3rd. i was hoping to get a quick fix out of it.

03-10-2007, 09:27 PM
o well, id say rebuild that bad boy, and make it even tougher!

03-10-2007, 09:32 PM
Had a chevy wouldn't shift into high gear, was a shift module. Couple hundred bucks if I remember . found out just in time was ready to have trany rebuilt.

03-11-2007, 09:28 AM
lucky1, that is what i was trying to remember, i had someone tell me that and i couldnt remeber what the person said

Travel'n Trees
03-12-2007, 02:00 AM
Go ahead and just do a allison.

03-12-2007, 08:51 AM
ahh yes, they only bad part of a ford is the only good part of a chevy. you most be an optimist!

03-12-2007, 08:21 PM
ooo yes! they have the kit to do it to! put an allison in it! thats the best advice!

Travel'n Trees
03-12-2007, 10:26 PM
Sorry Daricek you forgot the other good things brakes tight radius steering more weight hauling and better ride, better towing, mileage, fuel filters and cam sensor, durablity. My F-550 is has 3k miles, 4:confused: transmissions, all highway miles too, mostly empty (70 miles with load). Lemon I know but the state says they are a large employer here and I bought in a different state so I am screwed.:confused: