i noticed today driving my 01 7.3 while leaving work when my tranny shifted into od it had a slight bucking to it.just enough you could feel it.my tranny temp was only 50.it was 10 degrees here today the coldest ive ever drove it in. i checked for codes and the only one is 475 from my epbv being unplugged.what would cause this?this is the first time i noticed it.
i only put 4,000 miles on in the last 10 months so its not like i drive it alot.

 

We need more info, When was the last trans service? What color is the fluid? How many miles on the truck? Does the fluid smell burnt? You can only pull transmission codes with high end scan tools. Does the OD light blink? Lastly normal operating temp is usually 80*F over ambient temp. When mine is cold I will feel the tq lock and unlock but it goes away after it warms up.

 

Fluid looks good not burnt.I did the pan and filter after I bought it.there is 112000 on it.the overdrive light has not blinked that I noticed.I never felt it before today.I was thinking maybe because it was so cold out? It felt kinda the way a gas motor does with a slight miss.after I stopped to get it inspected I couldn't get it to do it again.

 

i think i was just being paranoid as usual.a buddy at work said both his 7.3's and his 6.0 now did it when it was that cold out.he said the 6.0 is worse for it when its cold.