Join Date: Feb 2010
Location: Grass Lake, MI
Thanked 1,726 Times in 1,042 Posts
If it's going into limp-in mode, what faults do you have? A slipping TCC will light the MIL but should not put you in limp mode.
I doubt a line pressure "booster" will do much for you. The main regulator valve will only go so high, no matter how much you try to "fool" it. And if the TCM detects slippage, it already cranks up the line pressure. So I think you need to deal with whatever fault codes you have first.
With 104K miles on it, replacing the main valve body assy with a new (anodized) one would probably be a good idea. This can eliminate a potential problem with SSV bore wear that causes P0871 faults and OD clutch distress.