I'm building an 05 f150. i will be putting on 33" tires on the stock 17" rims. I'm looking to re-gear for power. Both for towing and occasional drag racing. I've done searches upon searches and the more I look the more varying oppinions tend to be. Will 4.56:1 be too much? I'm not too worried about fuel economy. I know I'm going to be running around 2500rpm at highway.

How will these gears impact quarter mile times. And how will they impact towing.

Is there a better choice?

 

They will be helpful in the 1/4 and towing. The only possible down side with the 1/4 is you may not be able to maintain traction.

 

4.56 brought my truck back to near stock numbers with 35's. It is a bit more torquey off the line, but feels much the same otherwise. That may give you an idea... the 4.10 might be sufficient for the 33's. I'm unsure though if the 4.56 will be too much...

 

Ford racing makes a 4.30 gear. Split the difference.

 

Thanks for the replies. What do you mean when you say too much? Wider tires, sandbags when i need 'em, and RAS should keep the tires planted unless I'm trying to spin.

I heard someone say the truck gets to 60 real quick but acceleration upwards of 90 was a real dog. I feel like I'm confusing myself more and more the more I think about it.
You shouldnt be losing "oomph" at higher speed unless you're past the power curve in top gear. But on these engines I thought they made the most power right around 4500-5000rpm.
Is there something I'm missing?

 

Do they sell reverse cut for the 8.8!? I haven't been able to find them anywhere?

 

32/33 x 4.56 = 4.42

So 33" tires with a 4.56 gear ratio would be equivalent to stock tires with a 4.42!

3.73 is a tire burner stock, I couldn't imagine a 4.42!

32/33 x 4.30 = 4.16

So a 4.30 would achieve a little lower than 4.10

With that I might go with the 4.56 because a 4.30(4.10 equivalent) may not be that impressive of a drag gear.


And he'll just for grins lets see what a 4.88 would achieve.

32/33 x 4.88 = 4.73

 

I'm liking the sound of 4.30 gears.. I dont have any towing issues with 35's and 3.73 gears.. I just hate all the extra downshifting going over little hills..

 

Wow, really? I couldn't imagine trying to haul something with 35's and stock gearing... our trucks are geared way too high for that LOL. All that extra downshifting is unecessary wear and tear on your tranny. Lower gears will make your trans love you

 

The 4.30's do sound good though.