max towing capacity for 87 performance

[408F150]

I'm no expert on custom tuning but I'd imagine there are some major differences in regards to TC locking and shift firmness that would be a substantial change from performance to towing tunes. If it's any help, I towed my trailer at about 7800# this last weekend on a canned Evo 87 tow tune and it handled a 3 mile very, very steep grade pretty well. TFT hit around 208, which is on the hotter side but it was around a 10% uphill grade at around 15mph on a windy mountain road. I'm hoping that once I get mine upgraded and custom tuned it will be even better. Case in point, canned tune isn't perfect but it will get you by until you can have a custom one written for you.

[Jackpine]

My guess is, you were not driving very fast up this 10% incline, were you, 408f150? Did you have the transmission locked in 1st gear? Can you recall what your RPMs were?

- Jack

[408F150]

It was a very slow windy road up to a campground on the edge of a lake, I wasn't going much faster than about 15mph through most of it. I was locked in 1st gear with OD off.