Noise from rear end - 2003-04 Mach 1 Registry Owners Club

03machstock · 08-08-2011, 10:22 PM

Ok, so i had the interior out of my car for some time but i didnt drive it when i initially took it out. I drove it after i installed mm flsfc and mm xd rear lower control arms and wild rides torque box reinforcement kit (upper and lower). There was a wierd clunking noise coming from the rear. I had more work to do to the car so i continued the install of my S&W 8 pt roll bar, and just recently put the interior back in.(minus the rear seat as i still have to make a rear seat delete.) Anyway, iv been driving the car more and more now and the noise comes from any where above 35 mph when coasting, traveling at a constant speed while at low rpm, or coming to a stop while coasting. It varies the rate of "clunking" with speed of the car as well. Once you start to accelerate again, the noise goes away. Im kinda stumped without taking stuff apart and was wondering if anyone has heard of this, or expirienced this.
Thanks in advance,
Dan

Edit: I believe cause was found...see post 10

03machstock · 08-08-2011, 10:24 PM

FYI, i have ford racing 4.10 gears, moser 31 splines, and a cobra diff.

Slopony · 08-10-2011, 04:29 PM

Are the gears new? And what is your pinion angle set at? Sounds to me like a back lash or pinion depth issue, or possibly drive line noise from an angle issue

---
- 03 Azure blue track car. Yup, it's a trailer queen! Personal goal to get this rig into the 9's in the quarter, and 6.49 in the 1/8th

03machstock · 08-10-2011, 04:57 PM

No, had the gears for about 3 years now, and i dont know what my pinion angle is set at, i have stock uca and non adjustable lca, correct me if im wrong, but wouldnt that mean the angle is the same as stock?

Nekasrof · 08-10-2011, 05:51 PM

Check the UCA bushings.

03machstock · 08-10-2011, 10:42 PM

Quote:

Originally Posted by Nekasrof

Check the UCA bushings.

Ill check them out tomorrow after work and get back to you guys, thanks

03machstock · 08-11-2011, 04:32 PM

Had the car up on stands and had my dad go through the gears and when shifted and gas was hit, (barely, got up to maby 3 grand) the uca bushings gave ALOT, and you could see the driveshft where it meets the flange for the rear flying all over the place. Im guessing that means they are beat. I see that mm sells replacement bushings, but my guess is i will be replacing them all the time the faster i go. So, more permanent fix = aftermarket uppers against maximum motorsports suggestion? Thoughts?

Nekasrof · 08-11-2011, 11:11 PM

What are you planning to do with the car? If you are keeping the UCAs in the factory position, replace the bushings with factory. Don't get sucked in to replacing them with poly or anything else. Unless you are prepared to go 3 link, watts or some other variation, let the UCA bushings flex.

03machstock · 08-12-2011, 06:04 AM

drag/street car, and maby some road course someday if that track up the road ever opens up

03machstock · 10-18-2016, 09:07 AM

So I'm pretty sure the issue was that the pilot bearing was absolutely destroyed... I just dropped the trans (which I'm pretty sure what the noises were coming from it was just deceiving while driving) and just the outter race is left with the remaining parts everywhere else. I think with the input shaft being unsupported lead to all the clunking and banging.

wigsite · 10-18-2016, 09:35 AM

Keep an eye on it. Several times I thought I had rear end noise and there ended up being a fluid leak.

08-08-2011, 10:22 PM	#1
03machstock Registered User Join Date: Oct 2007 Location: Pennsylvania Posts: 323	Noise from rear end Ok, so i had the interior out of my car for some time but i didnt drive it when i initially took it out. I drove it after i installed mm flsfc and mm xd rear lower control arms and wild rides torque box reinforcement kit (upper and lower). There was a wierd clunking noise coming from the rear. I had more work to do to the car so i continued the install of my S&W 8 pt roll bar, and just recently put the interior back in.(minus the rear seat as i still have to make a rear seat delete.) Anyway, iv been driving the car more and more now and the noise comes from any where above 35 mph when coasting, traveling at a constant speed while at low rpm, or coming to a stop while coasting. It varies the rate of "clunking" with speed of the car as well. Once you start to accelerate again, the noise goes away. Im kinda stumped without taking stuff apart and was wondering if anyone has heard of this, or expirienced this. Thanks in advance, Dan Edit: I believe cause was found...see post 10 __________________ 2003 Mach 1- Azure Blue-Manual- Intake/exhaust/ 01 cobra cams/ NX wet kit- 351 rwhp 350 rwtq N/A- 460 rwhp 557 rwtq 100 shot. Last edited by 03machstock; 10-18-2016 at 09:08 AM.

08-08-2011, 10:24 PM	#2
03machstock Registered User Join Date: Oct 2007 Location: Pennsylvania Posts: 323	Re: Noise from rear end FYI, i have ford racing 4.10 gears, moser 31 splines, and a cobra diff. __________________ 2003 Mach 1- Azure Blue-Manual- Intake/exhaust/ 01 cobra cams/ NX wet kit- 351 rwhp 350 rwtq N/A- 460 rwhp 557 rwtq 100 shot.

08-10-2011, 04:57 PM	#4
03machstock Registered User Join Date: Oct 2007 Location: Pennsylvania Posts: 323	Re: Noise from rear end No, had the gears for about 3 years now, and i dont know what my pinion angle is set at, i have stock uca and non adjustable lca, correct me if im wrong, but wouldnt that mean the angle is the same as stock? __________________ 2003 Mach 1- Azure Blue-Manual- Intake/exhaust/ 01 cobra cams/ NX wet kit- 351 rwhp 350 rwtq N/A- 460 rwhp 557 rwtq 100 shot.

08-10-2011, 05:51 PM	#5
Nekasrof Hillclimb Extraodinaire Join Date: Aug 2004 Location: Perkiomenville, PA Posts: 2,594	Re: Noise from rear end Check the UCA bushings. __________________ RIP - Destroyed August 15, 2015 Motor + Procharger + driver = Baddest hillclimbing Mach 1 in the country Mustang dyno: 538hp/481tq @ 14lbs/19deg timing DynoJet comparison: 600hp/539tq Looking for more hillclimbers!

08-11-2011, 04:32 PM	#7
03machstock Registered User Join Date: Oct 2007 Location: Pennsylvania Posts: 323	Re: Noise from rear end Had the car up on stands and had my dad go through the gears and when shifted and gas was hit, (barely, got up to maby 3 grand) the uca bushings gave ALOT, and you could see the driveshft where it meets the flange for the rear flying all over the place. Im guessing that means they are beat. I see that mm sells replacement bushings, but my guess is i will be replacing them all the time the faster i go. So, more permanent fix = aftermarket uppers against maximum motorsports suggestion? Thoughts? __________________ 2003 Mach 1- Azure Blue-Manual- Intake/exhaust/ 01 cobra cams/ NX wet kit- 351 rwhp 350 rwtq N/A- 460 rwhp 557 rwtq 100 shot.

08-10-2011, 04:29 PM	#3
Slopony Registered User Join Date: Aug 2010 Location: Raymond, Maine Posts: 412	Are the gears new? And what is your pinion angle set at? Sounds to me like a back lash or pinion depth issue, or possibly drive line noise from an angle issue --- - 03 Azure blue track car. Yup, it's a trailer queen! Personal goal to get this rig into the 9's in the quarter, and 6.49 in the 1/8th

08-11-2011, 11:11 PM	#8
Nekasrof Hillclimb Extraodinaire Join Date: Aug 2004 Location: Perkiomenville, PA Posts: 2,594	Re: Noise from rear end What are you planning to do with the car? If you are keeping the UCAs in the factory position, replace the bushings with factory. Don't get sucked in to replacing them with poly or anything else. Unless you are prepared to go 3 link, watts or some other variation, let the UCA bushings flex. __________________ RIP - Destroyed August 15, 2015 Motor + Procharger + driver = Baddest hillclimbing Mach 1 in the country Mustang dyno: 538hp/481tq @ 14lbs/19deg timing DynoJet comparison: 600hp/539tq Looking for more hillclimbers!

08-12-2011, 06:04 AM	#9
03machstock Registered User Join Date: Oct 2007 Location: Pennsylvania Posts: 323	Re: Noise from rear end drag/street car, and maby some road course someday if that track up the road ever opens up __________________ 2003 Mach 1- Azure Blue-Manual- Intake/exhaust/ 01 cobra cams/ NX wet kit- 351 rwhp 350 rwtq N/A- 460 rwhp 557 rwtq 100 shot. Last edited by 03machstock; 08-12-2011 at 01:11 PM.

10-18-2016, 09:07 AM	#10
03machstock Registered User Join Date: Oct 2007 Location: Pennsylvania Posts: 323	Re: Noise from rear end So I'm pretty sure the issue was that the pilot bearing was absolutely destroyed... I just dropped the trans (which I'm pretty sure what the noises were coming from it was just deceiving while driving) and just the outter race is left with the remaining parts everywhere else. I think with the input shaft being unsupported lead to all the clunking and banging. __________________ 2003 Mach 1- Azure Blue-Manual- Intake/exhaust/ 01 cobra cams/ NX wet kit- 351 rwhp 350 rwtq N/A- 460 rwhp 557 rwtq 100 shot.

10-18-2016, 09:35 AM	#11
wigsite Registered User Join Date: Jul 2004 Location: Delaware, Ohio Posts: 1,504	Re: Noise from rear end Keep an eye on it. Several times I thought I had rear end noise and there ended up being a fluid leak. __________________ Borla catback BBK LT's/ catted mid JLT RAI..4.10..Moser 28 spline..UPR u/l Dyno tuned by CRT Performance Pro 5.0 Power Tower shifter best 1/4 12.62 @ 108.05 mph 313 RWHP..330 TQ

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