First time RDU fluid change

Discussion in 'Generation 4 - Maintenance & Troubleshooting' started by Zpak, Mar 26, 2020.

  1. Zpak

    Zpak Es Aich Oh!

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    Had the RDU done at 60K with PTU during warrantee trans work. Hit 75K and wanted to get some Redline Lightweight Shockproof in there. Thanks to all the advice and info I gathered I had a good idea what it would take so I felt well prepared.

    First off, I wasn’t going to fight the Taurus SLO exhaust hanger so I started with that.
    5495F43F-72D9-44FC-B447-61B0FE2E31BD.jpeg

    Got that sliced off and was ready to get started. Next time I change the fluid I’ll go in with a finger grinder and remove the rest welded to the frame but for now had plenty of room to get started. 250209AA-53CE-47D6-B4A2-461A9CB5D2FC.jpeg

    3/8 ratchet fits in the plug but it’s shallow so you have to be careful and hold it in. Good amount of goop and some fine shavings on the magnet but nothing too alarming. 226B631C-AFF9-4880-90A6-B1752761F574.jpeg

    For extraction I used my Capri brake bleeder. Just took the rubber fitting for brakes off and put a couple feet of 1/4 OD tubbing on the end. 0AC90B58-CEA1-439C-BEE9-6F916568550F.jpeg 46CBDF16-464F-4261-9423-CAE44ADC42FC.jpeg

    I fished the tube in and started to suck. Fluid looked pretty clean so I was happy about that. Took probably a good 45 minutes till I started sucking air. After that, I went under and worked the hose around for a couple minutes finding pockets of fluid. Probably got another ounce or two after that. 4914108A-8709-4789-ADC7-98246535A542.jpeg 9A8C3670-BD0D-4EA6-9947-611C26C75792.jpeg

    After I was satisfied I got out as much as possible I was ready for the refill. I have a pump for a one quart oil bottle but thanks to Redline coming in a goofy shaped bottle it wouldn’t fit so I had to transfer the Redline into an old trans fluid quart. Stuck the hose in and started to pump. AD7B9EEC-112C-47ED-A2F7-B26825340B80.jpeg

    The RDU is supposed to hold 1.2 quarts of fluid and I got just over 1 quart in so I know I got a pretty good amount out.

    CC0B9DED-8ABC-42F0-B78F-17313408666B.jpeg
    I had the plug all cleaned up and lubed with fresh high temp thread sealer while I was waiting for the extraction so all that was left to do was stick it back in and consider it a job... Done.
     
    Last edited: Mar 26, 2020
    Joshw0000, SHOdded, SM105K and 2 others like this.
  2. Deezuz

    Deezuz New Member

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    Awesome. I have a habit of sticking rare earth magnets on diff covers and oil filters just for extra filtering. Then of course ya gotta drop the diff cover eventually to clean it off but at least it helps to collect debris
     
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  3. Zpak

    Zpak Es Aich Oh!

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    That’s a good idea. I’m hoping to never take this cover off though. It’s super tight. I know it’s doable but it would not be fun.
     
  4. SM105K

    SM105K HATER MAKER

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    Bet you were shocked at the color of the shockproof fluid huh?
     
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  5. Zpak

    Zpak Es Aich Oh!

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    Yes! I started pumping and was like ok... well that’s kinda cool I guess.
     
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  6. BamSHO

    BamSHO SHO Member

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    I need to take a pic again, but I installed a drain plug onto my rear diff cover so I didn't have to suck the fluid out.
     
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  7. Zpak

    Zpak Es Aich Oh!

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    Yeah I saw the spot @mrhighcaliber advised drilling it. I have the tap and plug to do my PTU. Hopefully I’ll do that on my next days off. If it go’s well I’ll probably do the RDU as well.
     
  8. BamSHO

    BamSHO SHO Member

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    I bought a new cover, drilled a hole, welded a nut onto the outside. Works well, I have it on the lowest point I could
     
  9. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    I haven't changed my rear diff fluid, My mech popped the plug in front of me and showed me the fluid, it was golden and clean like it just went in. I have 98K on the odo.
     
  10. Deezuz

    Deezuz New Member

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    rear diff fluid really only needs to be changed if the rear end was sunken in water. I've pulled gear oil from F450's that hot shot at 200k miles and its perfectly fine.

    Only real reason to change it at least once is to get alot of the break in metal out. from then on just pull and clean the magnet once a year if that
     

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