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Rebuilding a 2004 Sport Trac 8.8 axle

Discussion in '2001-2005 Explorer Sport Trac' started by SN95GT50, November 1, 2017.

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    1. koda2000

      koda2000 Explorer Addict

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      Don't know it this will help you, but IIRC my '01 Sport Trac, which had rear drums, had the nuts on the axle ends. The Explorer rear end I installed, which had disks, had the nuts with tabs. This seems to make more sense to me (making the swap more easy) so I used the nuts with tabs during reassembly.
       
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    3. koda2000

      koda2000 Explorer Addict

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      Don't know it this will help you, but IIRC my '01 Sport Trac, which had rear drums, had the nuts on the axle ends. The Explorer rear end I installed, which had disks, had the nuts with tabs. This seems to make more sense to me (making the swap more easy) so I used the nuts with tabs during reassembly.
       
    4. SN95GT50

      SN95GT50 Member

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      You know that feeling when you realize you screwed something up real bad...

      For the first time since getting the brackets welded on and the tubes welded to the diff, I tried to load up the axles. Passenger side slid right in, Drivers side slid right in and then stopped about an inch short. fearing the axle tubes were bent. The guy who welded it up for me brought over a pipe with pucks to check the straightness and it was straight as an arrow. Tried inserting the shafts directly into the carrier and they slide right in. reassembled and no go. Tried sliding the short shaft into that end and it stopped short. Figured it out yet? The bearing was wrong. I slide a new bearing on and it slide right to where it should. Pulled old bearing out numberous pieces, seated new bearing in and the shaft slide in far enough to put the c-clip on. That was the best case scenario. Looked at the bearing boxes, national bearing, one said 6408, the other 6408 PT. Will be looking that up later.
       
    5. SN95GT50

      SN95GT50 Member

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      Pulled the TracLok out today, definitely the right choice to replace. 6.300mm on one of the stacks well out of tolerance, no material left on the friction discs.

      New disc should be her on Tuesday, hope I can get the spring clip back in.

      John
       
    6. koda2000

      koda2000 Explorer Addict

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      Tip: Use a small 'ish needle nose vise grip to squeeze/compress the spring as much as possible to get it started and then use a hammer to drive it into place.
       
    7. SN95GT50

      SN95GT50 Member

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      Thanks, I will try that, saw that in a YouTube video as well. The thing looks dangerous, vise grip on the spring will help slow it down if it goes flying.

      Here are my latest pics...

      Thanks.
      John

      Brakes on 1_sm.jpg

      Brakes on 2_sm.jpg

      Brakes on 3_sm.jpg

      Brakes on 4_sm.jpg
       
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    8. SN95GT50

      SN95GT50 Member

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      Completed the TracLok rebuild last night. Use of the needle nose pliers to insert spring was easier than I thought it would be. Went better than I expected. I will be adding the remainder of the friction modifier tonight and the gear lube. Cleaning up and painting calipers tonight as well. Mount rotors, pads and calipers tomorrow night and she is ready for install.

      I have a talk & tune as our Jeep club calls it for the install on March 10. Thanks for everyone's help and patience with me.

      John
       
    9. SN95GT50

      SN95GT50 Member

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      Again, thanks for everyone's advice as I move through this. Plan to pull Dana 35 out on Friday and install 8.8 on Saturday.

      Any recommendations on gear oil for the 8.8 with the TracLok?
       
    10. koda2000

      koda2000 Explorer Addict

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      Valvoline full synthetic 75W140 (or brand of your choice) a bit less 3 Qts and you need to use the Ford/Motorcraft friction modifier, even if the gear oil says it already has friction modifier in it.
       
    11. SN95GT50

      SN95GT50 Member

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      Was able to read the tag...

      Line 1: EHP OIL ONLY
      Line 2: Y75W900FEHP

      However, also read the instructions for the install of the carbon fiber clutch kit M4700C, who needs instructions when you have YouTube (obviously, I do). It lists in parts not included in the kit F3TZ-4121-AA which is a new axle tag indicating exactly what Koda2000 stated, 75W140 Synthetic, see link below. Also, as Koda states, 4 oz friction modifier, plus 3.5 pints (56 oz) 75W140.

      Ford F3TZ-4121-AA Rear Differential Axle DATA Tag 75W140 SYNTH OIL ONLY | eBay.

      Completed brake install and put rear cover on. Hitting underside of Jeep with PB Blaster regularly, got to say the bolts are pretty rust free.

      Thanks again for everyone's help. Will post more pics when I have the thing mounted.

      John
       

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