Josh, not in a rush, car will not be back on the road until spring

 

guys with 4.10's: what do you tach around 80-85mph?

 

Yup, I need to know this. I do a lot of Highway driving.

Anyone notice a decrease in total mielage? The EGR delete already knocked the wind out of mine...don't know if I really want a single digit mpg truck.

 

https://www.f150online.com/forums/sh...highlight=4.10

https://www.f150online.com/forums/sh...highlight=4.10

https://www.f150online.com/forums/sh...highlight=4.10

I did a LOT of research before switching from 3.55 to 4.10's.

The above posts should give you all the infor you need.

 

I've ridden in l-menace's truck datalogging WOT blasts no less than 12 times.
So.. he's sitting on 28" tires with 4.10s and mine is on 31" tires with 3.73s.

There is a pretty healthy difference in first gear to say the least!

My opinion.... A while back I really wanted to go with 4.10s. But now I can see that 1st gear would not be managable on street tires as I build up power. If you like to spin the tires then 4.10s are "it". If you want a no non-sense 60ft? Then 4.10s will only serve to hurt somebody running street tires (15+ psi of boost)

l-menace's RPMs were 2500-2600 rpms at 70mph. Mine at 70 is a little below 2000.

IMO.. The 3.73s, tall tires, and convertor are the right combo for how I like to drive. Easy on the street... passing lawyers on the strip.

Rich

 

until I upgrade to 20" rims... but that may have to wait another year, I think I have allocated too much $$ for this year mods as it is.

 

I waited 'til I added 22's to the truck before going to the 4.10's. They're almost 30 inches tall with the tires. The truck pulls much better around town; and, I'm actually getting about 1.5 mpg better with them installed. 70 mph comes at around 2200 rpms. I needed them. I can see why you wouldn't want them though. My next tires will be 31.6 inches tall in the rear; and, I'll be even happier that I have the 4.10's.

Roger

 

if you are planning to trap around 135-139 "one day", what size tire would you have to run in order to do that with 4.10's?

 

real big.

 

can anyone tell me what my rpm would be at 80 with 305-40-20 tires ?? Id like to compare them to now to see how much my highway miledge will decrease.

 

Anyone want to buy a brand new set of 4.10s? Was going to install with my Detroit locker, but I'm with Rich on this I think I'm better off keeping the 3.73s.

 

about 200 rpm more than now, with 373, but with 410s your boost dont fall off at shifts