Carlos Upgrades his 98 4Runner with a Rear Harrop and 488 Nitro Gears |
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(49 BIG pics loading) |
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March 16 2020 |
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Carlos's 1998 4Runner |
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As received from Oklahoma....front 7.5" clamshell and an open 8" rear 3rd. |
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488 Nitro gear package from Justdifferentials.com and a Harrop A9334 from Cruiserbrothers.com (rear 8" ring/pinion delayed a few days) |
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This link is for the rebuild of the rear diff which is in the fixture right now. |
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Product is unpacked and organized. |
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Diff has been cleaned using starting fluid and also a 10,000 rpm angle grinder with wire wheel attachment.. |
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New large inner race is tapped in with 360 degree support. |
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The small outer race is tapped in with 360 degree support using an old race on top. |
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The oil retainer under the race will need to be flared up with another tool. |
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Flared just enough to clear the solid collar. |
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Now onto the Harrop and the Nitro ring gear.....surfaces checked with a file and no unusual burrs or high spots found. |
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91% alcohol cleans the ring gear nicely. It only took gentle taps to get the ring to seat....a slip fit. |
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73 ft/lb on pre-cleaned threads with red Loctite. |
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New Koyo races are tapped in....the fit was very tight which is desired. |
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'''''''''''''''''''''''''''''' |
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This center carrier is now complete....now onto the pinion. |
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Taking a best guess and starting with a .079" shim |
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Mounting the pinion with no crush sleeve or solid collar. Those are not needed for just a paint test. |
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DRIVE side......favors toe end but the main concern it is way too deep. |
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DRIVE |
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COAST....looks actually kinda good....ever so slightly to the heel end. |
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Comet tail.....it talks to me.....says that it is too deep....remove some shim. |
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Definitely remove some shim..... |
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Please remove some shim.(comet tail is favoring the outside) |
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DRIVE....reshimmed to .073" and a slight deep condition that I prefer...favors toe end. |
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COAST....can't go any more shallow. |
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Looking at the reverse painted DRIVE looks very nice. |
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COAST....reverse painted......good. |
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Comet tail is now where it should be. ....halfway between the center and the root. |
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Tail looks good right where it is. |
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The Nitro kit actually had a factory pinion seal in it. Probably the best insurance against a oil leak down the road. |
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NOK brand. |
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BH6832E |
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New Nitro 29 spline flange. I skipped a few steps but the solid collar is already in. |
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Crank on the pinion nut until I see 10 inch/pounds start torque. |
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The tabs are tweaked until I see about 2mm of freeplay....3 in this case. |
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Got a new Husky brand torque wrench(Home Depot)....old one lasted 10 years worth of gear installs....not bad. |
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Backlash is recorded from every other tooth. |
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Minimum is .006" |
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Now to check a few things on the Harrop. Verifying the magnetic coil resistance of 3.7 ohms. |
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Now the 12 volt functional test |
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12 volts applied...turn the pinion which turns the ring gear which forces the 3 pins to ramp up into the case. |
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Remove the 12 volts and the pins SNAP back out. Harrop works fine. |
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Done....except for a cosmetic coat of Black Satin Krylon paint. |
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Notes of the install. |
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