View Full Version : FJ40 rear end advice needed

08-22-2008, 06:00 PM
My 75 '40 has a 40 LC rear end with Dana 60 full floaters and an ARB. I had to fix some leaks a while ago and was a little zealous on the wheel bearing adjustment (I did not have a fish scale handy). I also did not put an adequate amount of gear oil in the thing.

I went for a test drive and ended up having to drive to Ft. Collins for a family emergency (http://www.clairesjournal.com/2008/06/very-rough-day.html). As I pulled into the hospital the rear was "groaning." To exacerbate the issue I had to haul ass home from Ft. Collins to change cars while a helicopter took my daughter to Denver Children's hospital. I knew this was not good, and the rear end let me know it by really groaning as I pulled into the garage.

So, the wheel bearings are adjusted properly and the gear oil is full and I still can feel the rear end tighten up when warm (~1 mile drive). This is not the parking brake; I have already looked at this. Today, I took off the rear diff cover and inspected the ARB and gears in the rear. All looks well, but if I galled the carrier bearings I would not see it with just the cover off.

So, my questions:

1) I assume I should pull the axles and DS and remove the pumpkin. Agree?

2) Where should I take this thing for inspection? I can pull the carrier bearing caps but have not done this and will have to get some help so I think I should skip a step and bring someone the whole assembly.

3) Is there any of my RS friends that can provide some assistance. I have never rebuilt a rear-end so I am a bit out of my depth. Mechanically I understand how it works but don't want to experiment; I want it on the road.



08-22-2008, 10:02 PM
Jeff, sorry to hear about your day bro.

If I can help in anyway let me know, as for the rear diff... I am in new water as well. When you say groaning, is it metal on metal, gear noise (rythmic), or something else.

FWIW, I have an extra 3rd in my garage you could swap to stay mobile and work on the rear diff at a more convienent time.

Just let me know man. :thumb:

08-24-2008, 01:51 PM
OK, third member removed and on its way to get fixed. I am very happy that I added this the compressor and ultra quiet impact gun to the shop.:cool: What a difference!!!:thumb: