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[ Parts List ]
In Which I Do Some LSD
Limited Slip Differential, silly.
The rear axle appears to be out of ~1980 Ford Econoline Van. It has 3.50 gears.
Pumpkin is removed:
Detroit TrueTrac (helical “Torsen” style differential) is purchased:
Timkin carrier bearings are installed:
Ring gear boiled and hot, slipped onto frozen carrier to aid in reassembly:
This is when I discovered the old diff is also a Trac-Loc “clutch” type limited slip (with no “limited,” but extra “slip”), and the ring gear bolts are too long. And they look stretched. So new ARP bolts ordered and installed (ARP recommends 85ft-lbs).
This is a semi-hunting gearset, and the ring and pinion must be “keyed” together. Luckily there are marks:
Diff installed, carrier bearing preload set by turning in the adjuster until you see the outer bearing race just move, then turn each adjuster ONE hole more. Then adjust backlash (spec is 0.010-0.016″). I measured 0.016″ when I took it apart, I set it to 0.015″ on reassembly. Carrier Bearing caps are torqued to 80ft-lbs.
Now just need a slather of Permatex Ultra Black on the sealing surface, axles in, and some Redline 75W90NS GL5 goes in.
Video!