P1780 code - trans ctrl switch???
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
Yes, now I know. Your transmission has failed and needs to be rebuilt or replaced. When the RPMs go up to 3500 or 4000 and the truck is barely moving it means the transmission is destroyed.
New User
Joined: Sep 2015
Posts: 15
Likes: 0
ok but i know this problem was suddenly, i mean from one moment to another , the truck was running perfetly. now my questions is: is it posibliy?of break the transmision like this...
thanks everyone for your help
Posting Guru
Joined: Dec 2014
Posts: 1,792
Likes: 3
Depends on what transmission you have and what failed. A standard rebuild kit won't include major parts like ring gears, planetary gears or sun gears, if you have a failed or damaged one. Same goes for valve body and solenoids.
If it's the 4R70W/4R75W transmission, get the Sonnax kit to fix the common weak points:
https://www.rockauto.com/catalog/mor...nid=533&jpid=1
In addition to this you need a rebuild kit, Rock Auto carries them also. Find the most extensive one, they usually call them a "master kit" or a "deluxe kit"
But remember, rebuilding an automatic transmission is not your average DIY job, it's a very complicated task and you need to know what you're doing. It also requires a couple special tools. Take it to someone who knows how to rebuild transmissions.
If it's the 4R70W/4R75W transmission, get the Sonnax kit to fix the common weak points:
https://www.rockauto.com/catalog/mor...nid=533&jpid=1
In addition to this you need a rebuild kit, Rock Auto carries them also. Find the most extensive one, they usually call them a "master kit" or a "deluxe kit"
But remember, rebuilding an automatic transmission is not your average DIY job, it's a very complicated task and you need to know what you're doing. It also requires a couple special tools. Take it to someone who knows how to rebuild transmissions.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
Posting Guru
Joined: Dec 2014
Posts: 1,792
Likes: 3
Mark, what do you think about those Sonnax kits? Are they worth the money and do they fix "weaknesses" as they claim? I've always been recommended to get one of those if I'm getting the transmission rebuilt
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New User
Joined: Sep 2015
Posts: 15
Likes: 0
I got my transmission model. It is a 4r70w. But I couldn't find any repair manual for it
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
Www.atsg.us/atsg or Service Manuals, Owner Manuals, Wiring Diagrams, Service Bulletins - Helm Incorporated both have a manual for the 4R70w.