"TO" DIFFERENTIAL difference from T3

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Jan 12, 2026 | 04:13 PM

maddoctor

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From: Bolton Ontario, Canada

"TO" DIFFERENTIAL difference from T3

Hello, I have a 1968 442 with the T3 differential 3.91 posi 31 spline 672 pod. What is the difference in the TO 3.91 posi 31 spline 672 pod rear differental???

Jan 13, 2026 | 05:30 PM

oldoldss

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Joined: Feb 2009

Posts: 205

From: Saxonburg, PA

The Good Olds Days book says TO is for standard brakes, T3 is for front disc brake (JL2) or heavy duty brake (J56) cars.

Jan 13, 2026 | 06:05 PM

maddoctor

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From: Bolton Ontario, Canada

Ah yes, the disc brakes. My car has the 4 piston calipers.
Thank you, I skimmed right past that.

Jan 13, 2026 | 07:47 PM

Koda

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Joined: Aug 2013

Posts: 12,762

From: Evansville, IN

So this would mean the drum cylinders are different sizes for the different applications, I believe.

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