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#4729077 - 04/16/18 05:05 PM Underdrive Pulleys?
lawnguy Offline


Registered: 08/17/14
Posts: 320
Loc: Florida
I see that there are 2 offerings for underdrive pulleys for my vehicle. I noticed that they are each made from different metals.

Which is the better choice in your opinion,and why?

https://www.summitracing.com/int/parts/asp-528774/overview/year/2000/make/ford/model/f-150

https://www.summitracing.com/int/parts/bbk-15550/overview/year/2000/make/ford/model/f-150

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#4729079 - 04/16/18 05:09 PM Re: Underdrive Pulleys? [Re: lawnguy]
Astro14 Offline


Registered: 10/10/10
Posts: 8353
Loc: Virginia Beach
Why do you want to under drive your accessories?

Do you race the truck?

The drawback is reduced cooling system and alternator effectiveness if your truck is idling in the heat...which would be common in FL, wouldn't it?
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#4729083 - 04/16/18 05:13 PM Re: Underdrive Pulleys? [Re: lawnguy]
skyactiv Offline


Registered: 03/02/13
Posts: 4176
Loc: The Midwest
If you live in Florida and pull a trailer, I do not recommended installing one. You need to sell that F150 with it's 4.6 V8
and get something much quicker like a Chevy or GMC with a 6.0L V8 or an F150 with a Ecoboost 3.5.
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#4729085 - 04/16/18 05:17 PM Re: Underdrive Pulleys? [Re: lawnguy]
Cujet Offline


Registered: 02/15/03
Posts: 6981
Loc: Jupiter, Florida
Aluminum is not a great pulley material for poly v belts. Steel is considerably longer lasting.

If you are removing a harmonic damper and installing an underdrive pulley, consider that some engines have crankshaft vibration related failures.

One common failure that happens when a harmonic damper is removed, is the crank driven oil pump gears can shatter.
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#4729094 - 04/16/18 05:26 PM Re: Underdrive Pulleys? [Re: lawnguy]
Astro14 Offline


Registered: 10/10/10
Posts: 8353
Loc: Virginia Beach
If you need more power, sell this truck and buy one with a 5.4.

No tuner, pulley, exhaust, or intake will make enough difference in your case.

Honestly, you will be unhappy with the results of any of the above. They won't fix what's wrong with your truck: the 4.6
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#4729128 - 04/16/18 06:04 PM Re: Underdrive Pulleys? [Re: lawnguy]
CT8 Offline


Registered: 10/09/14
Posts: 10555
Loc: Idaho
Do not waste your $$$$.
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#4729150 - 04/16/18 06:21 PM Re: Underdrive Pulleys? [Re: lawnguy]
eljefino Offline


Registered: 06/15/03
Posts: 32384
Loc: ME
Did you ever change your axle ratio? That's how you get bolt-on power for cheap.

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#4729153 - 04/16/18 06:29 PM Re: Underdrive Pulleys? [Re: lawnguy]
OVERKILL Offline


Registered: 04/28/08
Posts: 35997
Loc: Ontario, Canada
This is an epic waste of money on a truck. If this was an old 5.0L that you were drag racing and needed to shave a 10th or 2, sure, underdrives and an E-fan all day long. Plus gears, aluminum driveshaft, icing the intake....etc. But on a DD truck? why are we continuing to try and chase the mole hair in the hay field? You already know what makes sense, we've discussed it many times now.
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#4729204 - 04/16/18 07:11 PM Re: Underdrive Pulleys? [Re: lawnguy]
Nick1994 Offline


Registered: 02/19/13
Posts: 9839
Loc: Phoenix, AZ
This truck must be a race car by now with all the mods done to it.

Let's see a 0-60 video!
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#4729210 - 04/16/18 07:16 PM Re: Underdrive Pulleys? [Re: lawnguy]
Kibitoshin Offline


Registered: 04/19/16
Posts: 657
Loc: Kaiōshinkai
lol this guy looking for big power from simple bolt ons.

Better off shopping for a used HD truck preferably an F250 6.2 gasser.
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#4729232 - 04/16/18 07:38 PM Re: Underdrive Pulleys? [Re: lawnguy]
oily boyd Offline


Registered: 05/23/05
Posts: 536
Loc: WI
Underdrive pulleys were a waste of money on my 5.0 Mustang in 1990 and they're still a waste of money now; the only "benefit" you may see is higher coolant temps at idle in Florida.

Those reviews on the sellers website saying that you can feel the difference are nonsense. Other poster who said change rearend ratio is spot on but: gotta set them up correctly so they're not noisy/wear prone and make sure your drive shaft is balanced well enough for the increased highway revs.
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#4729290 - 04/16/18 08:24 PM Re: Underdrive Pulleys? [Re: lawnguy]
eyeofthetiger Offline


Registered: 11/18/17
Posts: 676
Loc: South Carolina
The aluminum pulleys are the better choice, of course, because they are shiny. I might also assume that they are lower mass than the steel pulleys. Race car.
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#4729396 - 04/16/18 09:36 PM Re: Underdrive Pulleys? [Re: lawnguy]
double vanos Offline


Registered: 08/05/04
Posts: 1825
Loc: 5600 feet elevation, Arizona
I agree with the rear end ratio change as the best solution. Had a co-worker want to put a blower on his 5.3 Chevy pick up. He took my advice and scraped the blower idea, after the 4:10s went in the difference was profound. Cost him a lot less than a blower.
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#4729697 - 04/17/18 09:05 AM Re: Underdrive Pulleys? [Re: lawnguy]
SevenBizzos Offline


Registered: 12/10/06
Posts: 673
Loc: The IL
I'd go BBK on them. People have noticed differences with them. If you're blasting an after market radio or the air conditioning, you'll notice it negatively.

I'm in agreement that to really wake up that engine, a new ring and pinion and a tune are the best option.

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#4733264 - 04/20/18 03:59 PM Re: Underdrive Pulleys? [Re: lawnguy]
lawnguy Offline


Registered: 08/17/14
Posts: 320
Loc: Florida
It's so funny how all I do is ask a simple question,and I get so much negative comments. So funny!

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