Ballin STX

Guys,

Looking to putting new gears in the truck to get more pep and less strain on the truck. I'm currently running 295x70x17 w 4.6. Any advice on gears, what typical price would cost for front and rear differential.

Thanks,
Jon

schissler

what gears do you have now? thats only really a 33" tire so with factory 373s it should be fine. i wouldnt go any higher than a 4.10 on that size tire if you drive on the highway but its not worth the cost to jump one gear ratio up...if you had 3.55s then the jump to 4.10 would be worth it.

gears are about $200-250 per axle plus labor... and if you're replacing the diffs as well add another $500 per axle.

uzikaduzi

this is good advice... labor is what's gonna add up.. .the cheapest quote i've had for both differentials is 1300 (w/ yukon gears) if my bearings and seals look good, worst was ford at 2800( w/ ford racing gears)

Ballin STX

Thanks for the input guys! Yes, that is correct. I have 3.55 front and rear. The thing is I'm thinking about adding a lift down the road to throw on some 35"s but they may be a 6 months to a year from now. These heavy *** tires really put a strain my my 4.6 as you can imagine.

uzikaduzi

i have 3.55's with 296/70/17's (33.3") with the 5.4l and i want to re-gear with my towing performance... i think the 3.55's were a little light for the 4.6l. on my wife's truck, she has 3.73's and 33's and it's still not great (much less power than mine without re-gearing yet)... 4.10's i think would be perfect with the 33's but if you're going to 35's 4.56's would be better... the problem is 4.56's on 33's are gonna be similar to 4.10's on stock wheels.

Ballin STX

Is that so bad for 6 to 8 months??

uzikaduzi

4.10's are a factory option for some configurations so it's not gonna be un drivable with 4.56's and 33's. you're highway mileage isn't gonna be great but your city mileage may actually increase

'08f150stx

Try and get a feel for what rpm these guys are turning at your daily driving speed. Too low a gear might take you into a higher rpm range that may increase engine wear. I would save my $$ to re gear when/after you do the lift. You will have to re tune the pcm so the trans. shift points are on target. Got that last tip from a trusted mechanic.

MGD

Howdy thar, Ballin';

With a 4.6 2V, and it's native peaky torque curve and lack of low-end grunt ( and the fact that it loves to rev ), I'd recommend at least 4.56's - especially if yer comtemplating 35's later.

While 4.88's would make for an astounding improvement with 35's, if you drive any highway at all yer not gonna be real happy with the mileage ( if you care about such things given yer mod list). That l'il 4.6 2V will thank you though. If it's primarly city/suburban driving that you do, it would be wonderful.

You will need to correct for both GR & TS, plus partially account for the added static and rotational mass increases and power losses incurred by same, so factor a custom-tuned SCT flash programmer into yer budget ( approx $400 ).

In other words sell the Edge as it's time for something much better.
OR - Alternative is to Gryphonize it and ask Bill to provide you with a good hi-octane torque-enhancing custom tune. You'll need to run 91+octane to make a real difference on a 2v - only $60 per tune - a screamin' deal.

Try to plan long-term - regearing is NOT something you want to do twice

Good luck
MGD

uzikaduzi

as always MGD great advice but he said he has the 4.6l (I would say you're advice is still spot on from my inferior knowledge)