Underdrive Pulleys

[Dixie Design]

Originally Posted by 88Racing

Really, 4.6 still takes the stock size belt.

Just for curiousity what pulleys are swapped out?

The 5.4 swaps the crank and the waterpump, with new resized ones.

Lars

Summit's kit for the 4.6L 04 New body style and up replaces the same, crank & waterpump. The Crank was definitely bigger than stock. Their kit for the 04 Heritage and older was a 3 pulley set, with a new alternator pulley being the 3rd.

I was surprised it took the stock length belt, I bought the 99" belt first and it would NOT fit. Was half expecting the stock length to slip at WOT shifting like my old belt/pullies did, but it didn't.

[way2qk4u2c]

Does anyone know what part number is for the 04-08 5.4l UDP on the summit site?

[Dixie Design]

Originally Posted by way2qk4u2c

Does anyone know what part number is for the 04-08 5.4l UDP on the summit site?

I don't think Summit has a kit for the 5.4's

[88Racing]

Originally Posted by Dixie Design

I was surprised it took the stock length belt, I bought the 99" belt first and it would NOT fit. Was half expecting the stock length to slip at WOT shifting like my old belt/pullies did, but it didn't.

Yes Neal that suprises me also. Just another ? Where is the belt tensioner indicating mark? I usually mark it if I am working on one that doesn't have them.

Lars

[RZDANO]

[QUOTE=Dixie Design;5734]Summit's kit for the 4.6L 04 New body style and up replaces the same, crank & waterpump. The Crank was definitely bigger than stock. Their kit for the 04 Heritage and older was a 3 pulley set, with a new alternator pulley being the 3rd.

Are You sure the crank pulley was larger???? That would be an overdrive.

[Dixie Design]

Originally Posted by RZDANO

Are You sure the crank pulley was larger???? That would be an overdrive.

my bad, yeah it's smaller. Forums are "against the rules" at my 8-4, was in a hurry. Crank's smaller

[Jackpine]

I was going to ask the same question, when I saw "larger" - didn't make a lot of sense, did it? So, if the alternator pulley isn't swapped, I wonder if the crank is even smaller to give the same effect?

- Jack

[Dixie Design]

Originally Posted by JackandJanet

I was going to ask the same question, when I saw "larger" - didn't make a lot of sense, did it? So, if the alternator pulley isn't swapped, I wonder if the crank is even smaller to give the same effect?

- Jack

I wish I would have measured before I put them on, when I pull my fan out to install Troyer's efans, I'll snap some extra photos and take some diameters for y'all.

I'll post the photos I took after the install tonight.

[Dixie Design]

As promised, here are a couple pics I took after the install. I'll upload some more when I get that big ol fan out of the way

The waterpump pulley is the one closer, the crank pulley is the pretty shiney one.





And no I haven't put the Gatorback Belt on yet, just got the replacement this weekend after Summit sent me the wrong one for the 3rd time.

[dsilva584]

well i got my Summit UD pulley kit installed this weekend!! I took some pics of the pulleys next to the stock ones and when i go to post this i see i took a pic of the wrong side of the pulley!!!. The install went smooth until i went to start the truck with the stock belt on, I should have looked at the belt tension before i started up the truck and i would have seen it was bottomed out. I went to the parts store and got a 1 inch shorter belt and vualaa install complete. It was around 90 deg outside as i live in south Texas, pulled a trailer with 4 6x8 ft deer blinds with my truck on the canned tow tune and it never went above 196 deg (2hr drive). I let my truck idle for about 20 min at times cruzing around the ranch and it never got above 196 deg. As far as the charging system I have a red top batt. DVD screens/ 2 12inch subs/ 3 sets of HID's/tuner/ and Sirius radio all running at the same time and had no problems with the volt going to low it went down to about 13.6 but would go between that and 13.9 once i hit the gas it goes up to the normal 14.3 14.2 I set my idle speed +70. I think it was on here the MAD doc said that it would help to bump up the idle. Anyhow sorry for the long post I just wanted to let everyone know this has not been a bad upgrade for me so far!!!