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Old 06-22-2010, 02:04 PM   #1
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4.10's or 4.56's with V8?

Ok, I'm getting ready to re-gear, I've got a 5.4 gasser running 33" tires and wondering if 4.10's are going to be low enough or should I go to 4.56's. I'm not interested in speedo correction just real world driving performance. Looking opinions or recomendations from people with same set up. e.g.. 5.4 V8, 33" tires 4.10 or 4.56"s or lower. Also, I live at 8000 ft elevation so anybody with high altitude experience would be a bonus.

Thanks all....Luke
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Old 06-22-2010, 03:07 PM   #2
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Re: 4.10's or 4.56's with V8?

I'm runnin 4.10s with my 5.4 gasser w/ 33" and 2wd. Performance to me is very good. I'm not at 8K elevation but trailering a small dirtbike trailer has not been a problem when I am at 8K. Speedo correction (know you don't care) was right on the money. i can walk right up the hill running from Bishop to Mammoth Lakes, CA without any problems and leaving everyone behind. I do believe that the orginal gearing was 3.73
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Old 06-22-2010, 10:08 PM   #3
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Re: 4.10's or 4.56's with V8?

My previous vehicle was a F150 Supercrew 4x4 with the 5.4 V8. I had 4:10s put in due to the 3:55s being the only factory option at the time. If not towing the 4:10s were great from sea level up to 10K. The truck would run about 2100 RPM at 65mph with 4:10s.

I towed a 20ft toyhauler and the 4:10s really helped off the line compared to the 3:55s, but not as much as I had hoped at freeway speeds when towing in hills. Granted it was only a 5.4 but it was a great overall motor and still ran perfect at 120K. If I did it again and was towing or outfitting a heavy camper van I would probably go with the 4:56s even though the mileage may suffer a bit on the highway.

You might also check into the Troyer tunes, he is out of Texas and knows the 5.4 quite well. I had a XCaliber programmer with 3 different Troyer tunes, magnaflow exhaust and a K&N intake. The programming made quite a difference on shift points and how the motor reacted when letting off the throttle.
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Old 06-23-2010, 07:09 AM   #4
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Re: 4.10's or 4.56's with V8?

First off, thanks guy's for the responses....Eric what size tires were you running on your 150? Also, was the (65mph @ 2100 rpm) in overdrive or 3 gear? The 5.4 makes its max tourqe @ 2500 rpms so if that was 3rd gear I'd say that is still a little tall. I agree the 4od tranny could use some help with shift points w/ this motor, (seems to me Ford left out a gear in there somewhere.)

As far as towing goes, I have a 91 Mastercraft ski boat that weighs about 3000lbs w/ trailer. Do you recall how much your toy hauler weighed. Thanks again...Luke
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Old 06-23-2010, 07:58 AM   #5
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Re: 4.10's or 4.56's with V8?

I was running 33's x 12.5 pro comps. About 2100 in od, maybe 2400-2600 without od? For mountain passes towing sometimes I would have to drop into 2nd and just keep it about 50 letting it rev until over the top. Those motors will rev 3-4k no problem but they get a little noisy.

Trailer was 4500 dry and probably closer to 6000-6500 loaded with water, bikes and gear. I used a weight distribution hitch for sure and prodigy controller.
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Old 06-23-2010, 11:52 AM   #6
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Re: 4.10's or 4.56's with V8?

Thanks again Eric, think I will go with the 4.10's. found this cool website that calculates rpm's with tire size and your gear ratio's (axel and transmission) and gives you mph. with 4.10's in third gear at 2500 rpm's it says I should be going 59 mph, with 4.56's it drops it to 53.8 mph. Right now w 3.55's I'm doing 69 mph @ 2500 rpm. no wonder I'm having trouble pulling hills in third. Here are the 4od ratios if anyone is interested. 1st: 3.25 2nd: 1.92 3rd: 1.0 4th: .78 and here's the link to the website. http://www.angelfire.com/fl/procrastination/rear.html
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Old 06-23-2010, 05:39 PM   #7
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Re: 4.10's or 4.56's with V8?

I vote 4.56.
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Old 06-23-2010, 08:11 PM   #8
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Re: 4.10's or 4.56's with V8?

Well I just got back from Denver. I had to pick up my boat that was having a new cover made for it. I paid close attention to gears and speed and RPM's while going up the west side of the hill without boat and coming home up the east side with boat. conclusion....4.56's.. the way I figure if 4.56's are to low..... then I get some 35" tires, been wanting those anyway. That's it, decision made! I will let you all know how it turns out. Thanks all for the input...Luke.
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Old 07-08-2010, 09:30 PM   #9
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Re: 4.10's or 4.56's with V8?

My vote: 4.56's & don't look back. I have them in my Power Wagon w/33" tires & a super low geared 6-speed manual. I love em. I would have got 4.88's if I could have. These gears help immeasurably when hauling a heavy load (as all SMB do), off-roading, climbing in thin air, or just crawling slow to avoid damage/body damage.
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Old 07-10-2010, 09:15 AM   #10
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Re: 4.10's or 4.56's with V8?

Update...Went w/ the 4.56s.--- Picked up the van on tues. and just got back from a short trip to Glenwood Springs. Here are my first impressions.

The van is much better on the hills for sure. Going up to the Eisenhower tunnel from Denver we pulled the whole grade, without issue, at the posted speed limit. Vail pass was still a little steep for the 5.4, but we kept up with traffic for the most part. On the interstate I've lost the ability to cruise at 75 comfortably, although short bursts up to 75 and higher are doable, 60-65 seems to be where the van likes to cruise now in OD. Around town and on the "B" roads is where the new ratio really shines. Good passing and merging power and a whole lot snapier off the line. Haven't had the van off road yet but I did drive a little in low range and this thing really creeps along nicely. Can't wait to tackle some jeep trails around the neighborhood this weekend.
All in all I'm glad I went with the 4.56s over the 4.10s, although, I think the the 4.56s are probably better suited for a 35" tire. If your running 33" tires and can put up with the lack of high speed interstate cruising and are thinking of going to 35" tires in the future, then go w/ the 4.56s. If your happy w/ your 33s, then go with 4.10s.

On a side note, when they got the rear diff apart they found the remnances of a ford lsd in there. It was not working and the clutches were eating into the carrier. They fixed it all up and now Ive got both rear tires getting power. Ye haw!

Thanks again for the input...Luke
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