hi

well for some strange reason my trany is shifting in and out of gears at about 35 to 55 mph range ?

it did work fine until sunday evening .

started home about 80 mi trip and noticed it jumping between gears or in and out of lock up , i am not sure ?

it also did not want to up shift to od at times unless i accelerated hard till it hit 2700 rpm then it would go to od and stay there as long as i was crusing 60 + mph .

every time we had to slow for traffic it would dounshift and i would be driven about 50 and engine running 2100 rpm .
normaly it would go to od about 38 mph + light load .

tps is only 3 mounths old and fluid and filter 1 mounth old atf+4
switched relay in fuse box under hood no change ?
bands adjusted and a transgo kit in vb at fluid change .

i am thinking something electrical but it is not showing any codes as i have a odb2 reader and the key on off thing clear also ?

so what do you all think is going on here ?

 

Check your battery connections, and give them a thorough cleaning. I had very similar symptoms and I started with the simple things. It seems to have fixed the problem. It's worth a shot, good luck.

 

hi
i should have mentioned but i have already cleaned them and used a anti corosion lube they are clean !

thanks for the reply !

what about a speed sensor ? what does it do /control and where is it located ?

 

Id check the TPS and the OD temp sensor on the transmission