Rear end clunking noise ( I know rear end)

buffethat@comcast.ne · 04-18-07, 04:55 PM

OK guys,

I drove the 4Runner yesterday with the 37's for the first time, boy is that thing tall..........to tall. Anyway I am driving it everywhere to break in the springs and hopefully get some sag in it.

So here is the problem, when I accelerate rapidly or stop rapidly the rear end makes a clunking sound. Sort of like the third member is being pushed up or down and then setting in place. There seems to be some axle rap going on, as I rock the truck back and forth by pulling on the bumper you can see the pumpkin move up an down.

Does anybody have an idea on what it may be??

Here is the set up, 85 4Runner, 5" Marlin USA springs mounted to 2" lift shackles (soon to be removed) shocks are in the stock position.

Thanks for any help you may send my way.

BeaterToyota · 04-18-07, 07:14 PM

Could be a worn out u-joint at the axle end of the driveshaft. Did you just lift this rig? Maybe it was worn before, but not too noticeable with the stock driveshaft angle, and now with a steeper angle it is causing the noise???

cruiser88 · 04-18-07, 07:18 PM

go check your u-bolts

Full_M3tal · 04-19-07, 01:07 AM

U-Bolts Tight As You Can Get Them.

Bad U-Joints 40$ At Toyota, And 18.99 For Liftime Warranty At Checker.

Anti-Wrap Bar, Unless You Have A Anti Wrap Leaf Then You Dont Need One.

Check You Pinion Nut To See If It Is Tight.

Full_M3tal · 04-19-07, 01:10 AM

Aslo If You Have Anti Wrap Leaf Make Sure It Is On The Solid Point, Not The Shackle.

buffethat@comcast.ne · 04-19-07, 09:19 AM

Thanks for all the info guys, most of you were right on the nose. Found the issue, seems that the U bolts came loose after driving only 20 miles. My friend torqued them to the correct specs and we planned on checking them again in about a 100 miles but now I think everyday for about a week and then once a week for a month or so.

KliersLC · 04-19-07, 02:25 PM

It might be worthwhile to put some locktite on there after you get them tightened down....

Also, did you reuse the locknuts/lockwashers?

buffethat@comcast.ne · 04-23-07, 09:48 AM

The bolts are staying tight, the U bolts are stretching a little at a time. I checked them again last night and they were dead on, same torque spec I set them to on Friday. Looks like they are done stretching.

I will add some loctite once I feel everything is ready to go.

04-18-07, 04:55 PM	#1
buffethat@comcast.ne IH8MUD Junior Join Date: Nov 2006 Location: Roxborough, CO Posts: 111	Rear end clunking noise ( I know rear end) OK guys, I drove the 4Runner yesterday with the 37's for the first time, boy is that thing tall..........to tall. Anyway I am driving it everywhere to break in the springs and hopefully get some sag in it. So here is the problem, when I accelerate rapidly or stop rapidly the rear end makes a clunking sound. Sort of like the third member is being pushed up or down and then setting in place. There seems to be some axle rap going on, as I rock the truck back and forth by pulling on the bumper you can see the pumpkin move up an down. Does anybody have an idea on what it may be?? Here is the set up, 85 4Runner, 5" Marlin USA springs mounted to 2" lift shackles (soon to be removed) shocks are in the stock position. Thanks for any help you may send my way. __________________ Thanks Tom 1985 4Runner(again) Marlin crawler Ult. 5.29 with Elockers frt&rr, High pinion front with custom axles JPR motor with headers into 2.25 exhaust Marlin lift on 37's and a ton of other goodies. TLCA #6136 DD is a 2005 GMC Crew Cab 4x4 loaded.

04-18-07, 07:14 PM	#2
BeaterToyota IH8MUD Junior Join Date: Oct 2005 Location: Warrenton, VA Posts: 89	Could be a worn out u-joint at the axle end of the driveshaft. Did you just lift this rig? Maybe it was worn before, but not too noticeable with the stock driveshaft angle, and now with a steeper angle it is causing the noise??? __________________ '88 Toyota. Inchworm dual cases. Spooled rear. Dents.

04-18-07, 07:18 PM	#3
cruiser88 IH8MUD Lifer Join Date: Feb 2006 Location: over here TLCA# 17319 Posts: 7,640	go check your u-bolts __________________ ByPhilC64 Dig the anger on on the bacon sammich chaser. You being angry is like Boy George not trying to be gay. Go play with your 2 inch line, some hand cream and a sock. You'll feel better.

04-19-07, 01:07 AM	#4
Full_M3tal Moest_Killing Join Date: Jan 2006 Location: West Haven, Utah Posts: 358	U-Bolts Tight As You Can Get Them. Bad U-Joints 40$ At Toyota, And 18.99 For Liftime Warranty At Checker. Anti-Wrap Bar, Unless You Have A Anti Wrap Leaf Then You Dont Need One. Check You Pinion Nut To See If It Is Tight. __________________ Bullets For Blood I Like Caps! http://www.worldwideoffroad.com/ MyBuild Up: http://forum.ih8mud.com/79-95-toyota-truck-tech/140640-full_m3tal-build-up-86-4rnr.html

04-19-07, 01:10 AM	#5
Full_M3tal Moest_Killing Join Date: Jan 2006 Location: West Haven, Utah Posts: 358	Aslo If You Have Anti Wrap Leaf Make Sure It Is On The Solid Point, Not The Shackle. __________________ Bullets For Blood I Like Caps! http://www.worldwideoffroad.com/ MyBuild Up: http://forum.ih8mud.com/showthread.php?t=140640

04-19-07, 09:19 AM	#6
buffethat@comcast.ne IH8MUD Junior Join Date: Nov 2006 Location: Roxborough, CO Posts: 111	Thanks for all the info guys, most of you were right on the nose. Found the issue, seems that the U bolts came loose after driving only 20 miles. My friend torqued them to the correct specs and we planned on checking them again in about a 100 miles but now I think everyday for about a week and then once a week for a month or so. __________________ Thanks Tom 1985 4Runner(again) Marlin crawler Ult. 5.29 with Elockers frt&rr, High pinion front with custom axles JPR motor with headers into 2.25 exhaust Marlin lift on 37's and a ton of other goodies. TLCA #6136 DD is a 2005 GMC Crew Cab 4x4 loaded.

04-19-07, 02:25 PM	#7
KliersLC IH8MUD Lifer Join Date: Oct 2004 Location: Stafford, VA Posts: 2,290	It might be worthwhile to put some locktite on there after you get them tightened down.... Also, did you reuse the locknuts/lockwashers? __________________ No problem, I'll just tow the pig to Salt Lake on a UHAUL trailer...... 95 T100, beater edition 01 Sequoia Limited 02 Camry--Poor replacement for an 80 "A vehicle's capabilities are inseparably linked to the mental instability of the driver"

04-23-07, 09:48 AM	#8
buffethat@comcast.ne IH8MUD Junior Join Date: Nov 2006 Location: Roxborough, CO Posts: 111	The bolts are staying tight, the U bolts are stretching a little at a time. I checked them again last night and they were dead on, same torque spec I set them to on Friday. Looks like they are done stretching. I will add some loctite once I feel everything is ready to go. __________________ Thanks Tom 1985 4Runner(again) Marlin crawler Ult. 5.29 with Elockers frt&rr, High pinion front with custom axles JPR motor with headers into 2.25 exhaust Marlin lift on 37's and a ton of other goodies. TLCA #6136 DD is a 2005 GMC Crew Cab 4x4 loaded.

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