Matting a 6-speed auto to the HHR someday...

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Feb 11, 2021 | 11:13 AM

#11

milnersXcoupe

Joined: 02-07-2021

Posts: 2

From: New York

Six Speed Automatic

4T40-E/4T45-E, 4T80-E, & 6-speed Auto transmission info

Feb 11, 2021 | 11:26 AM

#12

donbrew

Moderator

Joined: 01-23-2009

Posts: 26,533

From: Fredericksburg,VA

Time Machine! The answer is still: yes if you use the TCM from the donor and can do the ECM programming.. Not a simple bolt on mod.

Feb 12, 2021 | 02:25 PM

#13

milnersXcoupe

Joined: 02-07-2021

Posts: 2

From: New York

6T45 MH7 Six Speed Transverse Automatic

This seems to be the choice for a HHR transmission upgrade.

https://gmauthority.com/blog/gm/gm-transmissions/mh7/

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