rear differential is banging when I take off!

alaska60 · 05-21-08, 03:30 PM

Is anyone familiar with this? I am certain I will need to pull the 3rd member to find out what this is. Any comments before I go elbow deep?

Front Range 4x4 · 05-21-08, 03:32 PM

The only thing I'd suggest before getting elbow deep is to stop driving it until you find the problem.

gaylon · 05-21-08, 03:43 PM

Are you sure it is in the diff and not the rear shaft needing to be greased?

alaska60 · 05-21-08, 03:47 PM

I havent pulled it apart yet as I have never heard this before today. low Greased axle will do this???..... it sounds like it is slipping for a split second and....bang! it engages.

alaska60 · 05-21-08, 03:49 PM

The drive shaft has new ujoints as well as plenty of grease in the yoke and joints.

alaska60 · 05-21-08, 03:59 PM

I guess I should state that it only bangs once and then it runs fine. when I stop it does it all over again. One bang and off we go!

Trapper50cal · 05-21-08, 04:10 PM

Check for play in the driveshaft at the rear as it leads to the third member.

Do you have an auto locker like an Aussie or Lockright?

Pinion nut, flange bolts, inner splines on axles or axle, improperly toleranced locker install. retainer clip failure. Ring or pinion gear tooth damage.

Somebody smarter widdle this list down a bit??

inkpot · 05-21-08, 04:12 PM

Quote:

Originally Posted by alaska60

I guess I should state that it only bangs once and then it runs fine. when I stop it does it all over again. One bang and off we go!

Howdy! Sounds like you need to drop the rear DS and test the pinion bearing preload by rotating the flange back and forth. You may have to put a lot of torque on it to see if it is creeping in and out of the nosecone of the diff. That's a bad sign if it is. John

BillyGHusk · 05-21-08, 04:35 PM

Quote:

Originally Posted by alaska60

The drive shaft has new ujoints as well as plenty of grease in the yoke and joints.

did this new noise coincide with the new ujoints?

Did everything get marked so when the new ujoints were installed the shaft went back together correctly?

just a thought...

Tim

Darkrealms · 05-30-08, 03:59 AM

Last time I heard something like what your describing it was replacement gears that fixed it.
When starting it bangs like its not aligned but the bang aligns it. Around a turn it bangs like the shift miss aligned it and it had to "bang" to realign.
If thats what it sounds like, I'd say its time for new gears in the 3rd member.

lehiguy · 05-30-08, 11:43 AM

I had an FJ40 that did this. Turned out to be spiders and the shaft thtat were buggered, the ring and pinion were fine. Take off the cover and have a look.

HighPlainsDrifter · 05-31-08, 10:13 PM

Quote:

Originally Posted by lehiguy

I had an FJ40 that did this. Turned out to be spiders and the shaft thtat were buggered, the ring and pinion were fine. Take off the cover and have a look.

x2 only on a buddies 10 bolt in his chevy pickup.

05-21-08, 03:30 PM	#1
alaska60 IH8MUD Rookie Join Date: Apr 2008 Location: Cooper Landing, Alaska and Utah too. Posts: 16	rear differential is banging when I take off! Is anyone familiar with this? I am certain I will need to pull the 3rd member to find out what this is. Any comments before I go elbow deep?

05-21-08, 03:32 PM	#2
Front Range 4x4 IH8MUD Lifer Join Date: Oct 2005 Location: Colorado Posts: 1,912	The only thing I'd suggest before getting elbow deep is to stop driving it until you find the problem. __________________ Chris - Front Range 4x4 1988 FJ62 - Emily - 250,000 miles, rust free awaiting an H55F 1968 FJ55 - Clarence - Unknown miles, not rust-free and now for sale: http://forum.ih8mud.com/fj55-classif...fj55-sale.html

05-21-08, 03:43 PM	#3
gaylon IH8MUD Regular Join Date: Apr 2005 Location: Towson, MD Posts: 364	Are you sure it is in the diff and not the rear shaft needing to be greased? __________________ '00 LC - OME Lift, REVOs, Group 31 AGM Marine Battery. '85 LC - OME Dakar Lift, 33" BFGs, ARB roof rack, bull bar & connected slider steps. Tuffy Console. '92 M101 Trailer '87 LC - Parting out now - what do you need?.

05-21-08, 04:10 PM	#7
Trapper50cal IH8MUD Addict Join Date: Mar 2005 Location: Durango, CO TLCA# 15812 Posts: 706	check Check for play in the driveshaft at the rear as it leads to the third member. Do you have an auto locker like an Aussie or Lockright? Pinion nut, flange bolts, inner splines on axles or axle, improperly toleranced locker install. retainer clip failure. Ring or pinion gear tooth damage. Somebody smarter widdle this list down a bit?? __________________ 83 FJ60-5" ALCANS-HYSTEER-80 TRE's-RICEBUILT RODS-AUSSIELOCKER-ARB DeerSlayer-LONGFIELDS-35" MTR's-BILSTEIN 5150's-Thanks Ige!

05-30-08, 11:43 AM	#11
lehiguy IH8MUD Regular Join Date: Mar 2008 Posts: 252	I had an FJ40 that did this. Turned out to be spiders and the shaft thtat were buggered, the ring and pinion were fine. Take off the cover and have a look. __________________ 1985 FJ60, 300HP SBC, NV4500, NP241, 14-bolt semi floater, 4.56 gears, four wheel disk brakes, 35" BFGs, 350,000 happy miles and still going.

05-21-08, 03:47 PM	#4
alaska60 IH8MUD Rookie Join Date: Apr 2008 Location: Cooper Landing, Alaska and Utah too. Posts: 16	I havent pulled it apart yet as I have never heard this before today. low Greased axle will do this???..... it sounds like it is slipping for a split second and....bang! it engages.

05-21-08, 03:49 PM	#5
alaska60 IH8MUD Rookie Join Date: Apr 2008 Location: Cooper Landing, Alaska and Utah too. Posts: 16	The drive shaft has new ujoints as well as plenty of grease in the yoke and joints.

05-21-08, 03:59 PM	#6
alaska60 IH8MUD Rookie Join Date: Apr 2008 Location: Cooper Landing, Alaska and Utah too. Posts: 16	I guess I should state that it only bangs once and then it runs fine. when I stop it does it all over again. One bang and off we go!

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