Jesse's 07 Taco Gets A Rear Trutrac And New Bearings |
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(43 BIG pics loading) |
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AUGUST 25 2018 |
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Jesse found this 8.4" 3rd on Ebay and had it shipped directly to me. |
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The packing job wasn't overkill but it got here with no holes in the box so kudos to the Ebay seller. ;) |
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The plan is to re-use the 3.9 gears and add a Truetrac and new bearings in. A quick paint check shows the drive side is good. |
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Coast is also good. No pitting or unusual surface tears. These gears are in good shape. |
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The Ebay diff actually arrived to me 99% clean :) |
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This also came to me from JustDifferentials.com |
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Truetrac for the 8.4" |
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Expertly machined case. |
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Very nice workmanship. |
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Got everything here to rebuild Jesse's diff. Cola sure is a funny cat sometimes. |
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Partially disassembled the 8.4 and moving the 3.9 ratio ring over to the TT. |
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92 lb/ft and Loctite on all 12 flange bolts. |
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Press the new carrier bearings on and this center section is complete. |
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Now to press the pinion out.. This bugger was on tight, too. |
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Some cleanup of the oem flange. |
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#1500 wet/drt sandpaper and this looks pretty good. The digital photo here makes it look like a wide deep groove. That is fake news. |
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This flange is a-okay. |
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Old pinion seal, bearings, and races go in the garbage. |
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Shot with half a can of starting fluid and the empty 3rd is very clean now. |
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New Koyo outer and inner races to be tapped in. |
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The small outer race tapped in firmly. |
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The larger inner was also a very tight fit. No pinion washer plate behind the race here. |
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Now onto the 3.9 pinion.... the factory pinion shim thickness of .081" will be placed behind the pinion head instead. |
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081 is made up of 3 shims shown here. |
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Pressing the new bearing with the Harborfreight 12t press. |
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This is the seal that is supplied in the Nitro kit. |
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For the 8.4", nothing compares to the OEM Toyota seal so this is what we will use. |
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The Genuine Toyota seal has such a nice quality rubber..... |
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.....compared to the generic seal. |
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Anti-seize on the threads and gear oil on all the rubber lips. |
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Even the bottom of the new flange style pinion nut sees anti-seize. |
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Even with all that low friction anti-seize, it still took 180 ft/lbs of torque to get this 12 in/lb of PPL. |
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83 ft/lb per the fsm on the 4 long bolts. |
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Backlash was recorded on every other tooth and was remarkably "stable" and really not varying much outside of .006 or .007" |
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Drive side. Centered and in the root. Very good for strength. |
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Coast. Slight toe and beautifully positioned. |
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Final notes of the install. |
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All boxed up and heading for Fedex now. |
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