Hard Shifting

[keninvirginia]

I have a 2000 F350 7.3....the issue i am having is hard shiftinng......if i drive normal then nothing is ever wrong.....but if i am hard on the acceleration when it shift from 2nd to 3rd the transmission shifts and hits with a HARD HIT just like i was bumped i the back.......the truck had a recall on the cam position indicator which i dont see how an engine part can effect the transmission.....anyone else have any ideas or had the same problem? next step is the transmission shop and i hate that because once they touch it then it will never feel the same....oh adn the mileage on the truck is only 12300 miles

[mustangz]

Mine does the same thing.It has done it since I have owned it.I wish I could also figure out what is going on with it. I know one day it is going to break something from 2nd to 3rd. I have been told it could be the convertor slipping and the ecm compensates with more line pressure and causes the hard 2-3 shift. Maybe someone will come and help out with this. I cannot run a tuner of any kind that effects transmission pressures as it tries to rip it out of the truck.

[bigcountrysg]

Is there any mods done to the truck. Is the o/d light flashing when this happens. It is a problem with the trans. I would suggest having a trans shop run some diagnostic tests on the trans.

[keninvirginia]

No mods have been made to engine or transmission. No Over Drive light flashing or comming on at all

[mustangz]

No codes in mine either. There are no good trans shops that will troubleshoot things like these in my area. They all say you need a new trans! Thats what they do. Thats why I thought I would give my 2cents and hoping there is a trans guy on here. Thanks for the help.

[MikeyK]

My 1999 7.3 super diesel tranny does the same thing, when I bought it I removed the pan, cleaned, replaced filter, installed a remote filter, drained the torque converter and
added new fluid plus a Lucas transmission treatment. So far it does the same thing, clues
???

[keninvirginia]

I was told by one garage to call Jasper Transmission and ask for the R&D dept and see that they can tell me...will keep you posted

[MikeyK]

In regards to the ultra-hard shifts. In my "need 4 speed" days, I put shift kits in every vechile I owned, and you got that "bang shift" in every gear, and It never did any harm to the tranny, but I would think it is hard on the u-joints. I have found that if I ease off the throttle when it is about to shift it isn't too bad. I hope someone takes theirs in to a "trustable" tranny shop and make a post on the results. It just doesn't bother me enough right now to
have mine scanned, what's kind of strange is that sometimes it shifts perfect.
This is my first diesel "super duty" truck, and I love it almost as much as air !

[keninvirginia]

I talked with a service tech at Jasper Transmission. He referred me to a local shop who can do the following...install a laptop in the truck and read temps pressure and shift points while they are drivinng the truck. Might not be an internal problem. Will keep you updated as the truck is going to the shop later this week.

[MikeyK]

I just found out where there is a good PowerStroke Tranny Man, I will get my truck in and will post the results. One thing about electronic controlled anything, they are A++ when they work, and when they don't you better have the correct diag tools to pin-point the problem and a technician that knows how to use them.

Thanks for your info...
MikeyK...NorthFlorida