|Rip upgrades his 03 Tacoma front clamshell with a 911A644 Truetrac and cryogenically treated bearings.|
|(55 BIG pics loading)|
|DEC 5 2017|
|Rip 2003 1st gen Tacoma sees some unusual duty.|
| The front 7.5" clam and the rear 8" V6 style diff are seeing rebuilds. The front will see a 911A644 Truetrac and new bearings |
that will be cryo treated.
| The bearings from both master kits were delivered to Cryogenics International which is located in Scottsdale, AZ. |
This is the smaller chamber that will be used for Rips' 8 differential bearings. Numerous other items are being cryo'd also.
Even these 4 drive belts for side by side UTVs are to be cryo'd.
Wouldn't you cryo a 3 pound belt that originally cost $125 for 30 bucks if you
found out in testing that they were lasting 3 times longer?
The reason they last longer?...in 2 words, Carbon Fibers.
|This just arrived...|
|The front 7.5" clam with factory 430 gears that will be re-used.|
| So, here's both diffs that will be rebuilt....the V6 diff in the background will see the cryo bearings and a solid collar. |
This write-up is on the front clam.
Here is the brief write-up on the rear 8" elocker HERE
|Got the bearings back from Charles. A proven bearing....Koyo. And this cryo process just made them that much better.|
|Everything is layed out.|
| The box for the Truetrac says A342 and the TT unit has etched on it A644.....|
Apparently, they revised the unit and still have a lot of old boxes laying around.
|The easiest way to get the driverside stub axle out.....|
|....is go in from the other side.|
|Find that "just right" skinny screwdriver and tap it out.|
|Out it comes.|
|Hmmm. Mostly normal with a few pieces of shrapnel that makes me wonder.|
|Remove the 10 bolts from the lid side and separate the halves....Lid on the left and Bowl on the right.|
|Really is a 430 gearset....the ring gear has a light stamp mark.|
|Remove the flange.|
|This piece of angle iron makes the clam more friendly in the 12 ton press.|
|It really takes a minimal force to get the pinion to drop out.|
|Remove the old bearing from the 430 pinion.|
|The new cryo treated bearings goes in its place.|
|The new cryo bearing is pressed on.|
|Both the Truetrac and the 430 ring gear are checked with a file for burrs or high spots and all was good here.|
|The Nitro master kit comes with new ring bolts so let's use them.|
|Tap tap and the ring eventually seats itself down.|
|Blue Loctite and 70 ft/lb on all 10 bolts.|
|The center carrier and the pinion end are ready...|
|...now the bowl and lid need a little prepping. First, to clean the orange FIPG off.|
| New inner race is going in. They make a special tool to pull the race into position...but I have found it's no big deal if the right hammer is used. |
The typical claw hammer does not have enough mass and won't fit in the small space involved. The stubby hammer shown does the job for me.
|Make sure it's started level and true by using a bubble as seen in the pic.|
|An old race is used to make sure the new race is driven home 100%.|
|BINGO! 100 % seated.|
|The outer race is easier.|
|A couple of old bearing parts makes the job easy.|
|Load the pinion in the hole.|
|The fixture serves double duty here and allows the new outer bearing and flange to be tapped in place.|
|The pinion nut was tightened and then used this nice torque meter to measure only a few in/lb of preload. Not enough.|
|The pinion nut was tightened just a smidge more and now it measure a healthy 12 in/lb which is okay for the upcoming paint test.|
| Washer plates had to be change 2 or 3 times to get the right carrier bearing bearing preloads and the desired backlash of about .006". |
But as can be seen above, the drive side paint shows shallow so now to add .002" to the pinion shim now.
|It's dis-assembled and press the pinion out.|
|It was .081" and now will be .083".|
|Now is a good time to install the solid collar. On try #2 the .051" shim did the trick.|
|On the 2nd paint check, the pattern was found and looks really good. It is centered and very wide.|
|Coast looks good, too. It's centered.|
|Comet tail agrees.|
|The supplied no-name seal is being upgraded to the genuine factory 38066 pinion seal.|
|Backlash is being recorded on about every 3rd tooth.|
|This is the recommended sealant for the lid per the FSM.|
|51 ft/lb and loctite on all 10 bolts per the FSM.|
| I don't recommend that the casual back yard mechanic try setting gears in the clams....in the 7.5" or the 8" or especially the 9" clams......|
....unless they have the tooling and washer plates and a little experience at cussing at clams :)