My 3:55 is just killing my performance. I know 4:10 is prolly what i should go with, but 4:30 will give me even more performance.

I am already getting quotes from 4wp and local places around houston to do the gear swap and put a ls unit in. $950 sound good for 4:10 ford racing gears and oem ls unit installed? That comes with the install kit also.

thx

 

If you want it to go hard off the line then the 4.30's are going to give you a better result. It doesnt really hurt anything going with steeper gears, just your mileage. And if your doing alot of highway long distances than that might not be what you want. But in the city go hard.

 

Even though i want max performance, i think its more practical for me to put 4:10 gears in. Also this local shop told me to get a ls unit that has a clutch. They said ones without a clutch clicks very loud when you turn. I was really looking foward to putting a detroit locker in too... Also this is just for street fun, no off-roading.

 

Go 4.3 if it is an option. I have 32s and 4.1 (upgraded from 3.55) and although it is a TON better, sometimes I want a little bit more.

 

The diffence is practically unnoticeable...4.30 will give you about 4% more rpm at any given speed.

I had the same experience as Lumadar, we had the same tire sizes & gears. I'd do the 4.30s with 33s...considering that 4.56 is ideal for 35s, and lot of guys run 4.10s with stock tires, and rave about the resutls.

 

I just got my 4.10s, I love them but at times I kinda wish I would have gone a little steeper. I agree with Lumadar, go with the 4.30s if its an option. As an added plus, going from 3.73s to 4.10s brought my mileage up about 1.5 mpg.
As far as price, I paid $1600 for gears, master install kits and labor for the front and rear (I thought it was a little high but he was still cheaper than the other shop in town and he gave me a 90 day if you can hurt 'em I'll fix 'em free warranty). I don't know about the LS.
Definitely swap gears, you'll love it! Its not as big of change as FI but it’s a mod worth the money.

 

I'd go with the 4.30s inasmuch as 4.10s with larger tires will result in an effective ratio less than the anticipated 4.10s.

 

True enough.

I think gears were the second best mod I did to my Expy...right behind the blower

 

I have 4.56's with 33's and I love the combo

 

A 4.30 or 4.33 gear set would be ideal on a 2004 and up truck if you can find them to fit the housing. Anybody have them yet?

 

Go with 4.30 even better 4.56. I did 4.10s in my mustang and was sorry I didnt do 4.30s.

 

4:56 no doubt will give me even better performance, but i think that might be waaaay to steep for 33''. I think i am going to go with 4:30 gears and a detriot locker true trac. I dont think i'll have any regrets. At one shop a guy told me that non clutchless ls units make alot of clicking noise when you turn, is that old technology?

 

I think that is mostly with full lockers (which has gotten considerably better). I have the truetrac and its very quiet. No noise whatsoever because its all gears. You dont even know its there untill you need traction.

 

Go at least 4.30. I have 4.56 with an Eaton locker and 33's with the 5.4 . Off the line she gets it real good. MPG is around 16 overall. With 4.56 figure on 2100@65mph. Don't be afraid of the gear !!

 

Nicely said