"Screech" Sound at 1-2 Shift

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"Screech" Sound at 1-2 Shift

Postby F9K9 » Sat May 05, 2007 8:50 am

I thought I heard the sound once before but, had the music up and just blew it off. I just made a short run to a country store and twice while under moderate acceleration I got a definite "screech" sound at the 1-2 shift. It sounds just like a belt screech. My belt is maybe 9 months old (replaced at the CS144 alternator upgrade. CC is under yrs old and under 30K miles on the "ticker". Maybe a belt tensioner growing weak? Any other possibilities?Image
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Postby 2kwik4u » Sat May 05, 2007 9:35 am

Only time I've ever heard a belt screech on a 1-2 shift was on a lightning with a built trans and running double stock boost. Trans would shift faster, pull the motor down faster than the blower could slow down......Truly odd sound, and a very unique situation. I wouldn't expect the engine belt to be squeeking on a mildly modified 4.3/4L60E combo. I'd pull the belt off, throw it in the passenger seat, and run down the street. Get one or two 1-2 shifts, and see what happens. That will tell you real quick if it's the belt or one of the accessory drives.

With that said, I have no other ideas what it might be.

Never heard a trans make that noise on a 1-2 shift. What mods has the trans seen? Fluid level OK?

Any chance it's the clutchs in the rear end? Checked the fluid back there lately? Just another thought.
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Postby HenryJ » Sat May 05, 2007 9:58 am

It is the belt. Mine does it under hard acceleration all the time.
I doubt it is the fault of the tensioner, as I said mine has done this from day one.
The smaller alternator pulley, or lack of a clutch fan may accentuate the effect?
I have used the stock belt, and a NAPA replacement. Same deal...screech at the 1-2 shift under full throttle.

Someone mentioned "Gatorback" belts. I run a belt shorter than stock to improve the clearance on the lower radiator hose and make up for the smaller alternator pulley.

What is the answer? "Doctor, it hurts when I do this..." Answer: "Don't do that!"

Perhaps another belt would work. I don't screech mine all that often. It is not on my priority list right now.

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Postby F9K9 » Sat May 05, 2007 10:13 am

HenryJ wrote:...................................What is the answer? "Doctor, it hurts when I do this..." Answer: "Don't do that!"...........................................


:lol: :lol:

That was what I was hoping to hear. Sounded to much like a belt to be anything else. I usually lay off the AC and have my windows down in warm weather and so, I knew it was from up front. I can't duplicate it every time but, it's definitely from moderate throttle. I'll put the issue on the back burner for now. :wink:

To busy patting myself on the back for my near completion of my first rear main replacement without missing any waterfowl :D
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Postby doughboy5499 » Sat May 05, 2007 4:34 pm

I put a gator belt on my cc about a year and a half ago and have never heard this noise. Don't recall it doing it before then though either. I drive hard I have a led foot on the start all the time and it don't do it. Could be just my truck or it could be because of the Gatorbelt too but.......
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Postby F9K9 » Sat May 05, 2007 5:11 pm

doughboy5499 wrote:.....Could be just my truck or it could be because of the Gatorbelt too but.......


I really think it is just a fluke for now. I have been putting off little things with my Crew due to working on the Heep. I knew that the Crew was a dependable steed for parts or tool runs even though it has some minor non life threatening issues right now (minor stuff like my am/fm antenna came unplugged when I worked on my XM radio last time). The Heep was a P/T dd and is down right now. New sounds from my trusty rig kinda freaked me though. :lol:

I think Brule is correct and I just over reacted..

I appreciate all the input though :)
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Postby killian96ss » Sat May 05, 2007 6:14 pm

I have Goodyear Gatorback belts on all my cars and none of them ever squeak or squeal. :D

They are IMO the best belts made. :wink:

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Postby F9K9 » Sat May 05, 2007 6:22 pm

killian96ss wrote:I have Goodyear Gatorback belts on all my cars and none of them ever squeak or squeal. :D

They are IMO the best belts made. :wink:

Steve


Have often thought about them and will give them a try when I get a chance. I figure that if, they are good enough for Steve........I'll give 'em a shot :wink:
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Postby WVHogRider » Sun May 06, 2007 6:41 am

f9k9 wrote:
killian96ss wrote:I have Goodyear Gatorback belts on all my cars and none of them ever squeak or squeal. :D

They are IMO the best belts made. :wink:

Steve


Have often thought about them and will give them a try when I get a chance. I figure that if, they are good enough for Steve........I'll give 'em a shot :wink:


Got the Gatorback on mine too... :wink:
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Postby daevans315 » Tue May 08, 2007 6:33 am

killian96ss wrote:I have Goodyear Gatorback belts on all my cars and none of them ever squeak or squeal. :D

They are IMO the best belts made. :wink:

Steve


The Gatorback belts are the only ones that don't chirp at WOT shifts on my 97 s-10 with a shift kit.

At my 50,000 mile tune up I put one on the crew and love it.
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Postby F9K9 » Tue May 08, 2007 1:11 pm

daevans315 wrote:..........The Gatorback belts are the only ones that don't chirp at WOT shifts on my 97 s-10 with a shift kit.

At my 50,000 mile tune up I put one on the crew and love it.


I'll try one when my current Gates becomes irritating. I dread changing it again because of the hassle I had finding the correct size after my alternator upgrade :roll:
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Postby HenryJ » Tue May 08, 2007 1:19 pm

f9k9 wrote:...I dread changing it again because of the hassle I had finding the correct size after my alternator upgrade
I'll second that! One more problem is no local stores carry the Gatorback belts here. No way am I going to mail order a belt and return it three times trying to find one that works.
I will live with what I have.

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Postby killian96ss » Wed May 09, 2007 6:09 am

f9k9 wrote:I'll try one when my current Gates becomes irritating. I dread changing it again because of the hassle I had finding the correct size after my alternator upgrade :roll:

All you need to do is take the # off your current belt and order a replacement belt.

The # on the belt is the correct size (mm). :wink:

C'mon you guys should already know that. :poke:

Most Checker, Schucks, and Kragen auto parts stores carry the Gatorback belts.

Summit can also cross reference you current belt # to get the correct Gatorback. :wink:

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Postby F9K9 » Wed May 09, 2007 7:28 am

killian96ss wrote:...........
Most Checker, Schucks, and Kragen auto parts stores carry the Gatorback belts...........

Steve


Don't have those stores here. :wink:
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Postby killian96ss » Wed May 09, 2007 8:22 am

f9k9 wrote:
killian96ss wrote:...........
Most Checker, Schucks, and Kragen auto parts stores carry the Gatorback belts...........

Steve


Don't have those stores here. :wink:

:o :(

If you can still see the part # on your current belt, write it down and use it for reference later. :wink:

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Postby doughboy5499 » Thu May 10, 2007 3:32 am

I got my Gatorback at Advanced Auto.
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Postby F9K9 » Thu May 10, 2007 3:52 pm

doughboy5499 wrote:I got my Gatorback at Advanced Auto.


I bought lunch today for a manager of our local Advance Auto and he is checking into special ordering a couple different sizes for me. He is also a member of one of our local crawler clubs so, I should be good to go.
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Postby killian96ss » Thu May 10, 2007 4:23 pm

f9k9 wrote:
doughboy5499 wrote:I got my Gatorback at Advanced Auto.


I bought lunch today for a manager of our local Advance Auto and he is checking into special ordering a couple different sizes for me. He is also a member of one of our local crawler clubs so, I should be good to go.

Were you able to read the # on the belt your using right now?

If you can still read the # it would make it easy for him to cross reference it to a Goodyear belt. :wink:

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Postby F9K9 » Thu May 10, 2007 5:39 pm

killian96ss wrote:.........Were you able to read the # on the belt your using right now?......


I really haven't had the chance to look yet, Steve. I spend what available daylight that I have trying to finish up the Jeep repairs but, I will. The places that I am currently wheeling are to tight for CC because a SFAed ZR2 with D44 front and 20 rear is unable to easily do it.
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Postby HenryJ » Wed Sep 03, 2008 3:00 pm

I changed to a Gatorback recently. You guys were all right. The chirp at WOT shift is gone. Any cold chirpy noises are gone.

That belt did the trick.

I did try both NAPA (Gates?) and AC Delco belts. Nothing beats the Gatorback. That will be my choice from now on.
Thanks! :thumb:

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Postby killian96ss » Wed Sep 03, 2008 4:00 pm

The Gatorback belt definitely has the best design out there right now. :thumb:

The Gates Poly-Cog is similar in design, however the placement of the cogs (parallel pattern instead of the 45 degree pattern that the Gatorback has) creates a vibration or hum. :?

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Postby YellowCrewCabber » Mon Dec 15, 2008 2:22 pm

I guess I believe in getting my monies worth. Original OEM belt with 118K miles on it. :) 10 years ago I bought a new '98 2.2L Ext. Cab Sonoma. Put over 100K miles on that belt before I changed it. Pushing the envolope on this belt. :shock:
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Re: "Screech" Sound at 1-2 Shift

Postby Horsehammerr » Sun Mar 12, 2017 2:42 am

This SCREECH I'm hearing is for sure coming from the rear of my CC. I hear it at about 40mph coming from the rear of the cab. First thought I was hearing an oncoming Siren, but when I let off the throttle to pull over it stopped. Accelerate and it's back. If I stay below 30mph its quiet.
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Re: "Screech" Sound at 1-2 Shift

Postby Horsehammerr » Sun Mar 12, 2017 3:01 pm

Checked Gear Grease level and found below full. Took 1 1/2 quarts to fill to bottom of fill hole. still makes minor growl sound when coming to stop. Suggestions ? Can see no obvious leak locations. Been couple years since last grease replacement.
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Re: "Screech" Sound at 1-2 Shift

Postby Horsehammerr » Tue Mar 14, 2017 3:08 am

Can someone Lead me to the right 8 1/2" rear Differential to replace my Stock '02 ?
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Postby _STUCKY » Tue Mar 14, 2017 4:12 am

I don't know if you are 3.73 or not but there has been a zr2 axle on the Hannibal craigslist for awhile. He wants too much for it in my opinion, but it's there.

https://quincy.craigslist.org/pts/6030356154.html
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