torque plate
 

ok,

so as far as highest to lowest?
how's a #10 plate?

i was thinking that a #10 i would gain the leat from is this true?

the 10 plate is a good plate. if you compare a 10 to a 6. the 10 plate is smaller. they have an 11 and 12 also.

12 is bairly above a stock plate
0 plate is the full fuel holding nothing back plate.

i bought a 10 because i thought it was one of the smallest.

i have no upgrades on my tranny. and i didn't want to harm it thats why i ask.

I ran a #100 plate with a stock tranny for a long time. The little "hook" at the bottom delays full fueling so it's not as hard on the TC.

i have alomst 180,000 miles on my 1st trans. i dunno how much time she has left?

she doesn't slip or anything

the hp from each plate depends on what pump you have. what year is your truck? auto or manual?

i have a p7100 94' auto

Another important consideration is how far forward or rearward its slid.
For a stock auto my vote goes to the #10 as it comes on a little slower to help save the driveline.