trd coils?

[01thunder]

i found some trd coils from a 2001 tundra but the coil color swatches are red/yellow? is there a difference between 2 and 4wd off road packages?

 

[the great him]

im not sure but i doubt they would be the progressive rate coils like the y/y, y/b coils... -possibly height difference too idk. but im almost certain the spring rate will be different as 4wd rigs weigh more than 2wd.

 

[01thunder]

they look the same to me. i pulled photos side by side and i don't see any difference. samd amount of wraps. perhaps wire thickness.