Trans Fluid Pump Rotor Kit - What am I measuring?

[jared999]

Doing a refresh on the trans pump for my 2020 Tahoe 6L80 Trans.

I'm eyeballing the Trans Fluid Pump Rotor Kits (Rotor kit and a bunch of o-rings) at Rock Auto. They have three types and I'm not sure what I should be measuring to pick the correct kit. Any ideas?

MM Inches Part #
17.948-17.961 .7066142 24054657

17.961-17.974 .707126 24054658

17.974-17.987 .7076378 24054659

 

[Fless]

Let's see if @NickTransmissions has any suggestions.

 

[NickTransmissions]

Doing a refresh on the trans pump for my 2020 Tahoe 6L80 Trans.

I'm eyeballing the Trans Fluid Pump Rotor Kits (Rotor kit and a bunch of o-rings) at Rock Auto. They have three types and I'm not sure what I should be measuring to pick the correct kit. Any ideas?

MM Inches Part #
17.948-17.961 .7066142 24054657

17.961-17.974 .707126 24054658

17.974-17.987 .7076378 24054659

You will need the pump body/bell housing machined first (or purchase a new body/bell from General Motors). Once you have the reconditioned or new body/bell, measure the depth of the rotor pocket with a depth micrometer and record the reading (measure in a few different places to confirm the bottom is 100% true). Then subtract .002 from your depth - that figure will give you the rotor thickness you need. Purchase the rotor that is closest in thickness to your recorded value.

 

[jared999]

You will need the pump body/bell housing machined first (or purchase a new body/bell from General Motors). Once you have the reconditioned or new body/bell, measure the depth of the rotor pocket with a depth micrometer and record the reading (measure in a few different places to confirm the bottom is 100% true). Then subtract .002 from your depth - that figure will give you the rotor thickness you need. Purchase the rotor that is closest in thickness to your recorded value.

Perfect, thanks! I've got a new housing and a depth micrometer, so I can do this today.

UPDATE: Part # 24054657 was the winner. 17.957mm.