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5-speed from Cobalt XFE in HHR?

Old 03-31-2018, 10:54 PM
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5-speed from Cobalt XFE in HHR?

Would there be any benefit in swapping the standard 5-speed for the special 5-speed that came in the XFE Cobalt?
They had a 3.63 gear ratio instead of the HHR's stock 4.17 (or 3.95 in 2009-11 models).
My goal would be improved fuel economy.
The transmissions are available locally for less than $200.

Last edited by Heritage High Roof; 04-01-2018 at 06:19 PM.
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Old 04-01-2018, 08:47 AM
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Looks like it would bolt on to a 2.2L. From my reading it is 3.63 is 2009-. Evidently the ECM tuning changed to standard equipment in 2009 (VVT), so the only difference is the trans.

So, yes you would gain about 1 MPG city 3 MPG highway. I don't think you would be able to use 5th in the city.
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Old 04-01-2018, 11:42 AM
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Is the final gear (5th) the same for both?
First gear will be "slower" when taking off from a light.
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Old 04-01-2018, 11:59 AM
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Seems like a lot of trouble and cost for a possible small gain in mileage.
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Old 04-01-2018, 12:07 PM
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From what I read, the accel from 0-60 is ok. 50-70 in 5th is more than 13 sec. I'm guessing overdrive is different. If you want to pass on the highway you have to downshift.
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Old 04-01-2018, 02:04 PM
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Originally Posted by donbrew View Post
From what I read, the accel from 0-60 is ok. 50-70 in 5th is more than 13 sec. I'm guessing overdrive is different. If you want to pass on the highway you have to downshift.
Are those numbers for the cobalt? HHRs are what, 400 lbs heavier? Seems we were just talking about gear ratios.

I would also want to know what the ratio is in each gear, compared to stock, before I made that decision.
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Old 04-01-2018, 06:14 PM
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The final drive ratio is the only thing that changes. All versions have the same specific gear ratios and spacing.
I need to correct the original post as the F23 5-speed in the 2006-08 HHR actually has a gear ratio of: 4.17 and the 2009-11 was changed to 3.95.
The standard ratio in the Cobalt was 3.84 and the XFE had 3.63.
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Old 01-11-2019, 06:06 AM
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depends on how long you plan on keeping the HHR
if you plan on keeping it long term, then it would pay for itself in a couple years. but outside of that I dont see it worth it time and $$.
but it is something to consider for someone like myself, who plans on keeping my HHR and passing it along to my son. Im pretty happy with the mpg I get now, or I should say Im surprised, as I see a solid 31-33 avg at highways speeds of 70mph with no traffic and no wind. if I get behind someone, Ive seen it go as high as 45mpg (scangauge verified) so a solid 2-3mpg gain on the highway would be worth it to me, especially since 90% of my driving is highway. :)
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