DoctorDiff Drivetrain Components

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Mopar 8 3/4"

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30 spline 8 3/4" spool
8 3/4" Lightweight Spool
$100.00

Lightweight 30 and 35 spline spool fits all 8 3/4" castings and all ratios.

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8 3/4" Inner Axle Seal
$4.00
Premium quality inner axle seal fits OEM '65-'74 8.75" housings
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8 3/4" Helical Gear Sure-Grip ("Sure-Trac II")
$595.00
DoctorDiff Sure-Trac II is a fully machined, forged steel 8.75" differential with helical worm gears similar to an Eaton True-Trac.
In stock
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8 3/4" Eaton Truetrac Differential
$575.00

8.75" Eaton True-Trac fits all 8.75" castings all ratios and all stock axles.

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8 3/4" Cone Sure-Grip Shim Pack
$25.00
These shims are used to restore lash between the side gear teeth and spider gear teeth during a Borg Warner cone Sure-Grip rebuild.
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8 3/4" Clutch Type Sure-Grip ("Powr-lok")
$395.00

Reproduction 8 3/4" clutch sure-grip ("powr-lok") includes upgraded 1 piece 30 spline side gears and 4340 cr-mo spider gears

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489 case kit
8 3/4" bearing rebuild kit
$85.00

Mopar 8 3/4" 489, 741, or 742 case bearing rebuild kit

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8 3/4" 489 Case Third Member
8 3/4" 489 Case Third Member
$1,275.00

New, nodular iron 489 casting built with forged steel caps, billet adjusters, crush sleeve eliminator and choice of ratio, yoke, clutch sure-grip or spool.

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8 3/4" 489 Case Crush Sleeve Eliminator
$30.00

Mopar 8 3/4" 489 Case Crush Sleeve Elminator

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