I would like to change to 4:10 gears... has any one with the v6 done this, i would like to talk to them, and ask a few q's?

thanks.

 

I'm going to put in 3.90's with a powertrax no slip.

 

Yea Talley can you give us the run down on changing gears? When changing them, what does it do to perfromance? Like what I was thinking is when you go up from stock, like to the 4:10's, you see a big increase in aceleration but a decrease in the top-end of your truck, top speed, etc. Is that basically how it works? Doesn't going up from the stock gears change the characteristics of the truck from more of a top end truck to a bottom end truck? Please explain. Thanks. Also what kind of price range would you be looking at to get the gears changed?

 

I'm swapping the gears out for free at UTI, but Pyler Bros. in Baytown qouted me $275 and 3hrs to do the swap. And additional $50 for putting in the powertrax at the same time. I was gonna do it myself, but I've got 3 buddies that are attending UTI and they do work on vehicles for free. MY hookup .

As for the trucks characteristics:

Our V6's are not a low end engine by no means.... they really like to rev. Lets say your going from 3.08's to 3.73's (just an example) Lets just say you have no speed limiter on this ok.

Story #1 w/ 3.08's:
You take off the start line on a 2 mile road.... you will start slow... and continue to pull slow until you are above 3500rpms. you will pull through 2nd and the first part of 3rd and you will keep pulling till you get to ~ 105-110mph.

NOW Story #2 w/ 3.73's:

With your rearend geared lower you will be able to stronger launches... and you will pull harder due to the gears letting you get into that 3,000rpm powerband. you will pull harder in all your gears and it will actually let you have a better top end as well. with the 3.08's your can only pull at 100mph+ only so much... with the 3.73's your able to rev alot quicker and this will put you into higher into your powerband and you will actually be able to get faster due to aerodynamics.

With lower gears you will break through that wind alot better.

gears will give you a much better low end and a lot better top end.

I have 3.55's on 30" tires. I've got 29" tires on now which makes me have a 3.70 rear end. I notice I pull better above 90mph.

 

somethin like that at least

 

I can't believe Pyle Bros. quoted you so low. They are usually HIGH!!!!!

Talley..you going with 4.10's?

Keep in mind that when you guys go with 4.10's you will effect your top speed in your trucks. Meaning if your truck toped out at 120mph with 3.55's and you switch to 4.10's then yuor truck won't be seeing the 120mph mark anymore. Not that it should be a concern at that speed.

 

Actually I got a recommendation from a guy who sent me there and I think that's why they quoted me so low.

Actually 02XLT:

I think with 3.90 gears I will be able to go past my 120mph, just because I will be able to utilize 5th gear.

as it is my top speed can only be achieved in 4th. With 3.90's or 4.10's I should beable to pump a little bit more out of it... But I doubt it. It'll take more power to use 5th.

 

I don't see how your top speed can ever increase by going to a bigger (numerically) gear

Examlpe: If your top speed it 125mph with 3.55's that is because your truck can't turn any higher in the RPMS right? If you go with 4.10's then you are going to hit that same RPM mark sooner and therefore your top speed will not be 125mph anymore. Am I off here?

Maybe I am confused.

Edit: If you gain on the low end then you WILL lose on top end when talking about just a gear change.

 

02XLT-

You are right if the gear change is more than 1 or 2 numerical steps up.

HOWEVER-

Let's say your vehicle's torque curve stops at 3200 RPM. You will only be able to pull to the top of your highest gear until 3200 RPM, at which point you will be unable to push through any further. Throw in a 3.73 in place of the 3.55's and you will actually be able to rev in top gear past your torque peak because it is easier for your engine to push through the steeper rear gear ratio. You will actually gain speed on the top and on the bottom with a small step up in rear axle ratio.

Another point to consider is this: So what if stepping up in gear ratio lowers your top speed? How often do you drive over 120 anyway? As far as I am concerned- if I can do 105 mph (which I rarely do anyway, but may touch in the 1/4 mile after all the mods) that's fast enough. I'll gladly trade 10-20 mph of top speed for 1/2 to 1 full second or more off my 0-60 time. Stop light to stop light racing isn't about who can go 140 mph. And I haven't seen to many V6 F-150's entering the Bonneville Salt Flat time trials lately.

Give me acceleration, or give me death.

 

Nice post WrongdayJ!


I never have the need for 140mph either.

 

well said....I think what Talley was saying is that he doesn't even use his top gear when reaching his top speed and with the new gears, he may be able to which will allow him to go higher.

I agree with wrongdayJ...I've only exceeded 100MPH twice and I do mostly city driving, so that 0-60 time is more important to me...but I'm not everyone!

 

Exactly! My top speed right now is in 4th gear ~ 4800rpm which is right at 122mph I actually hit 123 once. It will not pull anymore it comes to a complete stop. 5th gear will not accelerate past 110mph just due to lack of power.

I'm sure that with 4.10's I would be able to use 5th gear to get me to a higher top speed but it will take more power.

Once the procharger goes in I know I will be able to use 5th gear and my top speed will be ~ 140-144mph with the 3.55's churning 4600rpms.

I'm wanting to swap to 3.90 gear's which will put me to a top speed of 135mph @ 4,900rpm.

 

So what kind of price are we talking to go from 3:55 to a 4:10
and to do it correctly, with speedo gears and all?!?

is it a real big difference is the old *** ometer?!?

 

I don't believe you can get a speedo gear to correct the ratio since your truck is a 2000 model. And yes you will feel a difference in your pants from that change, cost will vary...

 

What do I do?!?!