If you want an Underdrive Pulley, Read First!

TN.Frank · Post by **TN.Frank** » Mon Aug 04, 2008 1:12 pm

I guess as long as it's not making any noise I'll let it be. I checked it lock to lock with the steering today and it's quite. If it starts to act up I can get a 4040490 and shoe horn onto the pullies, LOL. Anyway, talk to ya'll later.

LionheartedSXT · Post by **LionheartedSXT** » Thu Aug 14, 2008 1:09 pm

I think its about time I ressurect this thread since I have a problem with my belts now, So its been at least a month since my underdrive pulley has been in and now I guess since the belt has broken in or expanded because of heat it is making a decent amount of noise. I already figured out its my ps/ac belt because when I put the a/c on I can hear it squeak and even when in idle I hear it slightly. It has no effect on overall performance its just annoying. The belt i am running for the ps/ac is a dayco 500 series. My tensioner is also at it maximum according to the little marks on it. Does anyone have any suggestions for this problem?

LionheartedSXT · Post by **LionheartedSXT** » Fri Aug 15, 2008 12:06 pm

bump!! need help with this!!

fixitmattman · Post by **fixitmattman** » Fri Aug 15, 2008 8:08 pm

I'm about to try another gates 04k0490. I had luck with that before. Problem is the correct belt is a 04k0495 which is discontinued as far as I can tell.

LionheartedSXT · Post by **LionheartedSXT** » Sun Aug 17, 2008 8:14 pm

When you get it, let me kinow how it fits, cuz this squeak in my belt is really annoying...

LionheartedSXT · Post by **LionheartedSXT** » Wed Aug 20, 2008 12:35 am

anyone else have any input?

excon · Post by **excon** » Wed Aug 20, 2008 8:57 am

I know a quick fix would be wd-40... that's what my dad used on his plymouth...

Post by **occasional demons** » Wed Aug 20, 2008 5:01 pm

Yep, that 'll learn it! Might also crash into a pole because the PS belt slipped, but hey then no need to worry about it anymore!

on a more serious note...

Some belt dressing may help for a quick fix, if not help the belt last a little longer.

asanti · Post by **asanti** » Wed Aug 20, 2008 6:52 pm

LionheartedSXT wrote:anyone else have any input?

I've had 2 sets of belts F/S if anyone's interested in them. They're for the AF/X style pulley...

One common problem w/ the belt squeal is NOT having the pulley sit flush w/ the crank, I know from experience.

Later
Allex

Post by **racer12306** » Wed Aug 20, 2008 6:59 pm

dressing is mainly for v belts

neon angel · Post by **neon angel** » Wed Aug 20, 2008 7:22 pm

my belts started to squeeek after i installed an udp and ome to find out it wasnt the belt at all it was the tensioner pully was going bad? only thing thats bad with that is the part is a dealer only part with my little lub disount it ost me 89 buks with tax

NickKo · Post by **NickKo** » Thu Aug 21, 2008 10:09 pm

fixitmattman wrote:I'm about to try another gates 04k0490. I had luck with that before. Problem is the correct belt is a 04k0495 which is discontinued as far as I can tell.

If it is discontinued, it may have been 'superceded' by a new part number .....

OR you might be able to find another brand, that crosses over to their equivalent part number.

- Nick

fixitmattman · Post by **fixitmattman** » Fri Aug 22, 2008 6:56 pm

belt number did not superceed

LionheartedSXT · Post by **LionheartedSXT** » Sun Aug 24, 2008 10:56 pm

fixitmattman wrote:belt number did not superceed

Have you tried that new belt yet?

fixitmattman · Post by **fixitmattman** » Mon Aug 25, 2008 6:59 pm

Still sitting in my trunk

Mostly due to the fact that my car's been sitting in the parking lot at work during the last week and a half (on call, have to drive the work truck around)

If I don't put it on this week she'll get done the week after. Not in an uber hurry as I've had the gates 490 on there before.

fixitmattman · Post by **fixitmattman** » Thu Aug 28, 2008 11:13 am

Just installed a fresh set of belts this morning.

Napa 25040305 (alt.)
Napa 25040490 (acc.)

The 490 is fairly tight to get on as the adjuster is damn near at the full taut range of it's adjustment and requires a bit of finess to slip the belt over (it just barely fits), but it's on with minimal hassel and works great.

EDIT: Note that these need to be a Gates/Napa belt. I've tried other brands of belts in the 490 length and they will not fit.

LionheartedSXT · Post by **LionheartedSXT** » Thu Aug 28, 2008 11:49 am

What kind of UDP do you have, if you have on that is? We tried the 490 on my car before the 500 and it would not fit...

unleashedcc · Post by **unleashedcc** » Thu Aug 28, 2008 12:35 pm

LionheartedSXT wrote:What kind of UDP do you have, if you have on that is? We tried the 490 on my car before the 500 and it would not fit...

I'm getting an Mpx udp in a week, what year is your car that is having so many problems? I hear that in some 02 (like mines) will get a CEL after installment. Is it true? What aftermarket belts and sizes are recommended for the Mpx?

LionheartedSXT · Post by **LionheartedSXT** » Thu Aug 28, 2008 12:47 pm

Mine is a 2005, its not like i'm having too many problems, just one, and that is my damn ps/ac belt squeaking (hopefully thats the problem), and i'm guessing the belt is too loose, so yea thats my dilemna. The ones on the website seem to work fine, a couple people have posted in this thread about the mpx ones fitting perfectly... Not too sure about the cel thing so I will let sum1 else chime in on that

fixitmattman · Post by **fixitmattman** » Thu Aug 28, 2008 2:11 pm

It's an AF/X I bought used a few years back.

If you've got an AF/X and 04K0500 belt on the acc. then the squeak is more than likely the belt. The 500 I took off was tensioned too loose as the tensioner was at the end of stroke.

LionheartedSXT · Post by **LionheartedSXT** » Thu Aug 28, 2008 2:30 pm

Ok well I guess I'm on the mission to fit a 490 series again...cuz this squeak is sickening...what year is your car?

excon · Post by **excon** » Thu Aug 28, 2008 2:54 pm

Ok, for those of you with the Modern Performance UDP you will need two belts:

Serpentine Belt Alt., P.S., Idler & Tens.
Additional Info:
Metric No 4PK1270
Effective Length 50.00 in.
Top Width 0.54
No. of Ribs 4

and

Serpentine Belt Alternator
Additional Info:
Metric No 4PK0775
Effective Length 30.50 in.
Top Width 0.54
No. of Ribs 4

Hope that helps.

LionheartedSXT · Post by **LionheartedSXT** » Thu Aug 28, 2008 3:03 pm

guess i will add this info too the top...

NickKo · Post by **NickKo** » Fri Aug 29, 2008 11:48 pm

unleashedcc wrote:I hear that in some 02 (like mines) will get a CEL after installment. Is it true?

Unfortunately, it is true. Only the 2002's had this problem, for some reason.

I have heard that the CEL doesn't come on until the engine goes to 4500 or 5000 RPM.
You can avoid the CEL by staying under that, but that almost defeats the purpose ....

- Nick

SlvrACR · Post by **SlvrACR** » Sun Aug 31, 2008 9:54 am

I had an unorthodox one with gatorback belts no problems and reved much better.

LionheartedSXT · Post by **LionheartedSXT** » Sun Aug 31, 2008 10:11 am

fixitmattman wrote:It's an AF/X I bought used a few years back.

If you've got an AF/X and 04K0500 belt on the acc. then the squeak is more than likely the belt. The 500 I took off was tensioned too loose as the tensioner was at the end of stroke.

Where did you get your ps/ac belt from? the 490 gates/napa? I went to auto zone and they did not carry it, I will try advanced next...

Edit: Tried advanced and the people that work there are retarded...so found a local Napa auto parts store but they are closed already...Might try for tuesday...

fixitmattman · Post by **fixitmattman** » Mon Sep 01, 2008 6:36 pm

I bought them at Napa, hence the napa part numbers, because they need to be a gates belt.

LionheartedSXT · Post by **LionheartedSXT** » Tue Sep 02, 2008 3:54 pm

Update: got the belt recommended by fixitmattman today, will try to install hopefully by this weekend...

LionheartedSXT · Post by **LionheartedSXT** » Tue Sep 09, 2008 11:48 pm

Due to working like a slave this past weekend and my roommate's cheap ass tools, I have yet to install this belt. Will be getting a nice set of craftsman tools by Thursday hopefully, and then finally putting in the belt...

c987long · Post by **c987long** » Wed Sep 10, 2008 12:01 am

thanks i just bought a upd