In my experience working on lifted Taco's at work, you can only get away with a 1.5" rear lift before the line is stretched with the axle at full droop (i.e., on a lift at a service shop...) and thats with the stock shocks still installed. Stock shocks LIMIT how much the axle will droop by about 1". If you've got extended shackles and longer shocks, then you need to pony up for an extended rear brake line.
ALSO: If you've got a TRD rear electric locker, you need to check the routing of the wires to be sure they've got enough slack as well!
Ryan
