Guys, this is my third post, so far some great responses, thanks alot, it is always nice to be reassured in here... If you havent heard my story, I found a 1999 f 150 xlt ext cab, 4x4 off road package with 48,000 miles on it 4.6 ltr ( private seller ), great condition, great truck, great price..1st week I had it the overdrive light was blinking, took it to the dealer, needed 2 accumalator pistons,, 350 bucks.. but I feel better that the tranny was checked out, and flushed etc etc. I paid to have it hooked up to diagnostics.. clean , they told me the truck was in great shape,, ( other than the infamous door cracks by the windows, and the rust appearing under the front doors... ) undercarriage seems a little rusty to me, then again, I never owned a 4x4 pickup and i dont know what it is supposed to look at,, my question is why when im on the highway, I cant keep it under 80mph it moves so nice,, but when im in the city, light to light, it really lacks some uhh " umph " if you can follow me?? Does 48,000 miles really keep this trucks low end power down? Any suggestions? I mean, i dont know much about engines, or am i used to just driving cadilacs with northstars in them .. any info is always much appreciated, if you have ideas, im sorry but please be specific/ thanks alot

 

it takes that smaller v8 longer to get that big truck moving but once moving you can maintain and gain speed pretty well. (all about momentum)

 

Adding a chip/programmer, intake, exhaust, fans and pullies should help it get off the line a lot quicker. If you want to put some money into it...Or maybe just regear, maybe some 4:10s that'll help too

 

4.10 gears will make you love the truck. the 4.6 is a higher revving engine which means it makes it's power at 3000 rpm+ where as bigger displacement v8's make their power in the lower rpm's.

re-gearing it will make the rpm's come up faster when first starting out.

 

It's simple physics. It's a heavy extra cab 4X4 with the smaller V-8 before the PI version increased HP.

 

Yup. Not that the 11 HP gain from the PI'd ones really made a difference though.

If your into modding vehicles-there are thousands of products out there to help your truck move better.

 

Unless you have the M5OD manual the 4.6L isn't real snappy off the line stock.

Adrianspeeder

 

thanks for your help guys,,