PY Online Forums - Bringing the Pontiac Hobby Together - 12 bolt posi and MW C-clip elim and axles

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- - 12 bolt posi and MW C-clip elim and axles (https://forums.maxperformanceinc.com/forums/showthread.php?t=788707)

12 bolt posi and MW C-clip elim and axles

For sale used "tuned" Eaton 12 bolt 3 series posi 30 spline from Tom's Differentials with heat treated spider gears ( pn C12 1017)
$275+ shipping

Used 30 spline Mark Williams Master Line axles for 12 bolt 54.250 housing width, and C -clip eliminator kit.
Axles are drilled for 1/2" threaded studs with 3 bolt patterns. 5 on 4.5" ,5 on 4.75" and 5 on 5"
$150+ shipping

Ran these in my 70 grand prix. I swapped to 35 spline axles and a spool before I put a Trans brake in it.
The splines on one axle look like they started to twist slightly (see picture). After I noticed this, I checked them a couple times a year for 3 years and it didn't twist anymore, even though the car got faster. Eventually ran some high 9s at 4150lbs with 1.39 60 foots with these parts.

Is 3 series for 3:08-3:73 gear ratio's?

Sent from my iPhone using Tapatalk

Yes, 3.08 to 3.73
Richmond also makes a 4.10 that fits the 3 series carrier.

Sent a PM and put me in line if there is one.

Posi is sold, axles still available.

$130 + shipping for axles and c-clip eliminators