96 F-250 with hard shift

[04SSHD]

I was just wondering what would cause the tranny to shift hard into each gear. I have 315k miles on my truck, and when under normal to heavy acceleration the trans shifts a little hard. Under normal accelleration it seems to shift normal. I am confused, can anyone help me out?

[DirtyDiesel]

do you have a programmer on it. generally programmers firm up shifts.

[04SSHD]

I have no idea if there is a programmer on it, I just bought it. I do know it has 315k miles...would that effect the shifting?

[DirtyDiesel]

with 315k it might have already had the tranny rebuilt so it could shift harder from that. if it puts out black smoke when you firewall the go pedal then it probely has a chip or programmer already in it

[04SSHD]

no black smoke at all. I think something might be wrong with the motor tho...it seems to be lacking power.

[DirtyDiesel]

probelly 315k hard miles could be the problem.

[power95]

they tend to shift hard under heavy accel. u gotta think it is transfering all that torque at that high of RPM