GMC Sierra 2500HD Forum : “Allison Transmission upgrades”

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Joshua1220

05/28/2008, 9:03PM

About: 2003 GMC Sierra 2500HD

Allison Transmission upgrades

I was about to upgrade my whole transmission... because my torque converter is slipping into 1st and into 5th.... but has anyone ever done an upgrade? Who with? What brand? and did it help?

littlehorn

05/29/2008, 2:47PM

I would contact a mechanic you trust, they should have some suggestions of what they have done.

Joshua1220

05/29/2008, 8:40PM

That's the problem... I don't trust anyone here... that's why I"m asking here

Joey840

07/21/2008, 5:35PM

if your transmission is slipping then it may need a service. Any triple disc billet torque converter would be a good
choice for a slightly modified engine. if you have over 500hp then you probably want a 5 disc torque converter.
new valve body and a shift kit could also help your transmission out. companies like ATS and BD make strong
reliable torque converters. they also make super strong fully rebuilt transmissions.

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