Harrops at both ends with Nitro 488 gears for Stu's 1997 LX450 |
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(48 BIG pics loading) |
JULY 5 2019 |
This is Stu's 1997 LX450. 488 gears and Harrops at both ends will be a BIG jump in performance. |
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Basic mods are the front bumper and a 2.5" lift. |
A heavy box with Stu's rear 3rd in it has arrived. |
The 3rd is mounted in the fixture. JustDifferentials.com sent this "gear package kit" to me in 4 days time. It conveniently contains everything to do the front and rear gear installs.... both ring/pinions...both bearing kits....both solid collars....and the larger 29 spline pinion flange for the front..... |
And, last but not least, the rear Harrop elocker sent directly to me from Australia. I can't believe I get these things in only 3 days time to my doorstep! God bless DHL. |
All the good stuff is layed out for the rear install. |
Both surfaces are checked with a coarse file and all checks out fine. |
Ring went on perfect....not too tight and definitely not too loose. All 12 ring bolts were dropped in place and everything was in perfect rotational alignment. I have a good eye for lining up the holes from years of practice. |
Red loctite and 81 ft/lb. |
Tapping the carrier bearings on...... |
This portion is now complete. |
Took my best guess and will use .056" pinion shim for the 1st try. |
Old races welded together works well for me. I see I scribed on it 12-29-13....almost 6 years ago. |
Now onto the pinion end of things. Pressing the pinion out. |
New inner race...... |
....100% tapped in all the way. |
New smaller outer race also tapped in. |
The pinion is now mounted and the nut tightened up just enough to offer about 10~15 inch/pounds of preload. |
Install the diff carrier and tighten the wheel adjusters to get some bearing preload while watching the backlash. |
Tooth is painted and the result is a very nice drive side pattern.....looks super. |
Coast looks ok. |
And the comet tail on the pinion tooth confirms that I do not want to go any deeper....to leave it alone. |
Says here if I go any deeper then I will be in a "too deep" condition. |
Perfecto |
Just got lucky on the pinion shim so now can install the solid collar. Many times, the collar plus shim tend to be very close to 2.135". |
Got lucky again using .0455" as the shim. Hit it right on the money. |
Now the Marlin seal designed for the 27 spline flanges can be tapped in. |
The Marlin seal rides in a new virgin region about .200" below the usual groove on the flange. |
Anti-seize reduces the friction......now I can tighten the nut with less of a hernia chance. |
A smooth 10 inch/pounds of PPL. Of course, lots of fresh oil on both bearings and the seal was well oiled too. |
DING |
Stu has not sent me the front 8" high pinion yet.....but when he does, I'll have the rest of his product ready but I digress. |
So, the pinion end is complete....I also drilled the 29/64" hole for the rubber grommet. And now to put the diff carrier in. |
I made sure that the stop tab freeplay on the Harrop tabs was 2 mm. Backlash was set to .007" minimum. The preload of the carrier bearings was set to a solid 5 inch/pounds. |
The resistance of the magnetic coil checked in at the usual 3.8 ohms. |
RTV on the rubber plug helps seal and lubricate for the push-thru. |
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Now the 12 volt test. |
12v is applied to the magnetic coil wires. It draws less than 4 amps. |
With 12 volts applied the grey electro-magnetic ring on the right attracts and bonds the ramp ring to the left of it. |
Now turn the pinion which turns the ring gear(and left case portion) and the 3 pins are forced to move into the case as shown. Pass 12volt test. |
Data is inscribed. |
A snapshot of the assembly notes. |
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