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

Registered: 08/17/14
Posts: 326
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?

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

Registered: 10/10/10
Posts: 8596
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?
32 Packard 15W40
02 Volvo V70 T5 0W40 M1
02 Volvo V70 XC 0W40 Edge
05 MB S600 0W40 M1
16 Tundra 1794 5W30 Valvoline

#4729083 - 04/16/18 05:13 PM Re: Underdrive Pulleys? [Re: lawnguy]
skyactiv Online   content

Registered: 03/02/13
Posts: 4480
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.
Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual

#4729085 - 04/16/18 05:17 PM Re: Underdrive Pulleys? [Re: lawnguy]
Cujet Offline

Registered: 02/15/03
Posts: 7217
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.

#4729094 - 04/16/18 05:26 PM Re: Underdrive Pulleys? [Re: lawnguy]
Astro14 Offline

Registered: 10/10/10
Posts: 8596
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
32 Packard 15W40
02 Volvo V70 T5 0W40 M1
02 Volvo V70 XC 0W40 Edge
05 MB S600 0W40 M1
16 Tundra 1794 5W30 Valvoline

#4729128 - 04/16/18 06:04 PM Re: Underdrive Pulleys? [Re: lawnguy]
CT8 Offline

Registered: 10/09/14
Posts: 11210
Loc: Idaho
Do not waste your $$$$.
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

#4729150 - 04/16/18 06:21 PM Re: Underdrive Pulleys? [Re: lawnguy]
eljefino Offline

Registered: 06/15/03
Posts: 32763
Loc: ME
Did you ever change your axle ratio? That's how you get bolt-on power for cheap.

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

Registered: 04/28/08
Posts: 36599
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.
2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT

#4729204 - 04/16/18 07:11 PM Re: Underdrive Pulleys? [Re: lawnguy]
Nick1994 Offline

Registered: 02/19/13
Posts: 10277
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!
2015 Hyundai Sonata 2.4L 80k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 228k Mobil 1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k Mobil 1 HM 10w40 & Fram Ultra

#4729210 - 04/16/18 07:16 PM Re: Underdrive Pulleys? [Re: lawnguy]
Kibitoshin Offline

Registered: 04/19/16
Posts: 708
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.
Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L - 170k mi
02 Chevy Silverado C1500 V8 5.3L 154k mi

#4729232 - 04/16/18 07:38 PM Re: Underdrive Pulleys? [Re: lawnguy]
oily boyd Offline

Registered: 05/23/05
Posts: 539
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.
Kind Regards,


#4729290 - 04/16/18 08:24 PM Re: Underdrive Pulleys? [Re: lawnguy]
eyeofthetiger Offline

Registered: 11/18/17
Posts: 683
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.
2017 Ford Fiesta 1.0T - Valvoline SynPower 5W-20, Motorcraft FL910S
1988 GMC K1500 4.3/700R4 - Supertech 15W-40, Fram TG3980
1986 Ford Ranger 2.0 - uhh

#4729396 - 04/16/18 09:36 PM Re: Underdrive Pulleys? [Re: lawnguy]
double vanos Offline

Registered: 08/05/04
Posts: 1914
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.
Sabine Schmitz is the Queen of the 'Ring; Svetlana Kapanina is the Queen of the SKIES...

#4729697 - 04/17/18 09:05 AM Re: Underdrive Pulleys? [Re: lawnguy]
SevenBizzos Offline

Registered: 12/10/06
Posts: 700
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.

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

Registered: 08/17/14
Posts: 326
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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