hi i have a 4.7 4x4 with 3.55 gears and when ever i go up hill it goes from about 1500 rpm to 3400 rpm to climb the damn thing. is there any thing i can do to fix this should i get a gear swap to 4.56 and if so do you know how much that would cost or is it just normal for it to down shift gears like that ?

 

4.56 would be pretty drastic

 

its going to cost a good penny,(don't forget you haft to do the front to),had the same problem,the headers and tb made a nice differeance but thats not cheap neither

 

i had the 3.55's too andjust went to 410 and it seems real good. 410 is a pretty good all around gear. it will be expensive though.

 

you could back off the throttle and then it wont go to 3400 rpms... let the torque push you over the hill

 

well in my truck when towing up a hill, it will hit that 3000 rpm's then it just won't slow down, it just keeps speeding.

 

If i dont hold the throttle it slows down to around 45mph from 60mph

 

one option is to wrap your fuel rails to keep the heat soak off them... it will help with the low/mid range power. If motivated.. you can take it a step further and go with a fuel cooler. I did this on my 2000 and it gave me 6% better mileage on the hiway. when I sold the truck I took off all the mods and sold the cooler to a 2nd gen owner who put it on in front of his e-fans... his response was very enthusiastic... he mentioned a good low/mid range bump in power.

 

I went from 3.55's to 4.56' and drove from Michigan to Georgia over Easter this past April. Driving through the mountains with the new gears and larger MT's made a huge difference. I can probably count on one hand how many times the truck downshifted on grades.Unless it was really steep.

 

ok where would i get a cooler for it?