2001 with 57,000 on my odometer. My current motor has 7,000 miles on it.

Rich

 

58,000 here on a 99L..modded and all

 

Garage Queen

 

118K miles on my 99L..put 4lb pulley on at 75K miles, JDM chip was on at 50Kmiles... other mods are air raid filter and boost bypass..Seen 5 passes at one trip to the track with best ET of 13.5 at 105mph (Very extreme 98 degree heat). Still running decent for a daily driven L every since I bought it in 2000 with 14K miles

 

i have 49k on my 99 with knock on wood no problems yet with a 4lb. A friend of mine has a 6lb and headers with 59k and he doesn't have any problems either. Tuning is also very important, both of us went to jdm hope this helps

 

If you run mild enough boost, stay out of detonation, I feel longevity would be fine.

 

a guy in my local club has over 100k on his. the tranny is the first to go, but his lasted until around 105K before it started acting up.

 

39000.00 on my '00

 

Thanks for all of the replies. Good point jeff2001silver, the Lightnings do have lower compression than a stock F-150. I think the stock 5.4 3V is 9.8:1. What are stock Lightnings, 8.5:1? The thing I like about the Roush kit is the 3yr/36,000 mile powertrain warranty they give. I guess as long as I run a good premium gasoline like Roush states, I will get some decent longevity out of the engine?

 

155,310 miles on my '99 with no major problems.

The extra torque, not the extra horsepower a supercharger provides, is what stresses the drivetrain, particularly the transmission. If (when) it fails, you should consider beefing it up.

 

hp = torque x rpm / 5252

 

2001 L, 50K. No problems other then losing a Freaking Quart of oil every 3000 Miles!!