Eaton Detroit Truetrac for D44 TTB - Part Number?

[SteveG]

I'm gathering parts to put the OchoFab beams on Wilson... anyone know which Trutrac fits the 81-83 TTB D44 with the bolt-on axle?

This one is listed as, "Eaton Detroit Truetrac 30 Spline Differential Dana 44/44 IFS 913A592"

https://www.summitracing.com/parts/etn- ... /year/1982

And this one is listed as, "Eaton Detroit Truetrac 30 Spline Differential Dana 44 913A591"

https://www.summitracing.com/parts/etn- ... /year/1982

Screenshot 2025-02-18 103244.png (363.56 KiB) Viewed 27691 times

[SteveG]

Found it... I need the 913A592, which is for gear ratios numerically higher than 3.92. Ordering!

[toddz69]

Quite an upgrade for Wilson! Is the front diff currently open?

Bolt-in front 3rd member? If so, I think I helped Paul pull that diff at a hot dusty Phoenix yonke many years ago .

Todd Z.

[PaulW]

Is that the same Trutrac that is currently installed?

[SteveG]

Quite an upgrade for Wilson!

Haha. Yes. The car works so well as it is... to say I'm hesitant to change anything major is an understatement. But, the front beams / arms have been repaired A LOT. Before we got it and after... and recently.

Is the front diff currently open?

Bolt-in front 3rd member? If so, I think I helped Paul pull that diff at a hot dusty Phoenix yonke many years ago .

Current is a Trutrac... works well. But I want to assemble the axle-housings completely before tearing the car down. I hate downtime! Plus, this leaves us with a functioning spare front diff for Wilson and White Lightning.

[SteveG]

Is that the same Trutrac that is currently installed?

Yup. It works well, so I'm just replicating the setup.

[VintageIronFab]

Is Wilson getting extra width?