Harrop elocker A13457 and Nitro 4.56 gears for Brian's 2008 Tacoma 8.4" |
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(36 BIG pics loading) |
DEC 1 2017 |
Brian is local and dropped his 8.4 off to me. I had the Harrop/master kit/456 Nitro gears waiting on the bench. To view the front 8" clam 456 gear install CLICK HERE. |
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The harrop elocker with the harness and Nitro gears. |
Some kits have the generic seals and some have the upgraded Japanese seals and this one had the generic so a genuine oem seal will be substituted. I'm holding up the wrong part number but you get the idea. |
A quick resistance check shows 4 ohms of resistance....pass. |
Applying 12 volts means about 3 amps is being drawn and the grey electromagnetic ring is magnetically bonded right now to the ramp ring. |
Never ran across a burr or ridge on a Nitro yet....this one is just fine. So is the mating surface on the Harrop. |
Teardown. |
On the right can be seen the 2 washer plates that determine carrier bearing preloads and backlash values. .111" on the left and the same .111" on the right....rarely are they the same. |
It took an Earthquake to shake the 12 super tight and loctited factory ring bolts off. |
The ring gear is pressed on using wood....and about 1 ton of persuasion. |
Per the fsm, 92 ft/lb and blue Loctite. |
This end is done. |
Pressing the pinion out. |
Old race was removed and the new Koyo race is going in. |
Skipped a few pics but the new inner race was installed with a .087" pinion shim (behind the race). New bearing was then pressed on the 456 pinion shaft. |
Mount the pinion with the shop flange and mount the Harrop case and this is the resultant paint. Driveside....perhaps a touch too deep even for me. |
Disassemble and remove .002" from the pinion shimpack. The .005" was removed and the .003" replaced it. |
Removing the .002" is the "tweak"....I know I will be happy with the results so now I can put the solid collar in. |
On the 3rd try, the collar shim was nailed down. The oem seal is now installed and the flange can be installed. |
29/64" hole has been drilled. |
Backlash is dialed in here. |
Last chance to get the desired carrier bearing preload. My final CBPL measured 8 in/lb which is a solid, strong preload. |
The stop tabs were adjusted and measured with 2.5mm of freeplay....the book says around 2mm. |
The tabs were bent out slightly with a crescent wrench. |
The FSM says 83 so that's what I use. |
Backlash is checked on every other tooth and the backlash minimum here is .005" |
Drive....nice. |
Coast....nice. |
The comet tail is right in the middle so it's me that I'm right at the slight deep condition which means quiet gears and max strength. |
12 volts is hooked up and the locker works great. |
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Ready for Brian to pick it up. |
A light engraving of the specs measured. |
A snapshot of the assembly notes. |
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