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post #1 of 4 (permalink) Old 03-07-2018, 08:49 PM Thread Starter
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2006 cobalt 2.2 transmission swap into an 06 HHR

Hello everyone new to The Forum Cobalt great little cars I bought an 06 that was wrecked with a good transmission and I also bought an 06 HHR with a bad transmission both vehicles have the 2.2 engine my question is as anybody swapped a transmission from a Cobalt into an HHR I have done a lot of reading and seeing that the gear ratios are different and it would work in my favor for the better fuel mileage on my HHR I know the transmission will bolt right up and everything will plug-in but my question is will it throw the speed sensors off enough to set a code or will my speedometer just be off just a little bit any help would be appreciated thank you. I could just go buy a used HHR transmission but since I already have this Cobalt one laying around that I know is good and I got for next to nothing and the gear ratio would work in my favor I figured be worth a shot
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post #2 of 4 (permalink) Old 03-08-2018, 04:43 AM
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Given they use the same part number, I believe you would have to the speedometer recalibrated in the tune to account for the taller final drive ratio. But yes, it would improve highway fuel economy at the expense of some low-end acceleration. Given the HHR really still isn't that heavy, I'd say it won't be a major deal. And since you have to pay someone to tune the computer (though, being a 2006 makes this much, much harder to do), you might as well pay for them to tune it as well.

But like I said, tuning an '05-06 Cobalt/HHR is much harder than '07+.

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post #3 of 4 (permalink) Old 03-08-2018, 05:54 AM
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Isnít that all that calibration in the BCM?

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post #4 of 4 (permalink) Old 03-08-2018, 05:57 AM
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The BCM takes the speed signal from the trans and sends it to the cluster in a way that the cluster knows the speed figure, no matter which cluster you have. However, the BCM would be expecting a 3.90:1 final drive, not the Cobalt's 3.63:1.

The TCM needs to be adjusted to send the correct signal.

1986 Chevrolet Camaro IROC-Z - Wrecked/Sold
1998 Chevrolet Cavalier - Wrecked/Donated
2007 Chevrolet Cobalt LT - M62 Supercharger, Ported Throttle Body, 42 lb/hr Injectors, Intense 2.9" Pulley, Cobra Heat Exchanger, SS/TC Exhaust, TTR Engine and Trans Mounts, Trifecta Tune, ZZP Header and Downpipe, '08+ FE5 Struts/Shocks, SSC Springs, FE5 Control Arms, SS/SC Front Swaybar, Powell Hardcore Rear Swaybar, 18" MSR 045s, Dunlop ZIIs, Nightshaded Tails/Side Markers, Shorty Antenna, Black Bowties, Black Grilles, Black Headlights, Dual JL 12" w1v2 Subs, A/D/S Front/Rear Speakers, Pioneer 7" Touchscreen, G85 Recaros, Leather Rear Seats, 160 MPH Cluster.
2014 Chevrolet Cruze Diesel - 17" MSR 013s, Black Bowties, Black Tails, UR Rear Lower Bar
1981 Chevrolet Camaro Z28 - JVC Ribbon Tweeters, SEAS Mids, Pyle Woofers, Kenwood Tape Deck, Zapco Amp/Equilizer, Ceramic-Coated Longtubes, 2.5" Pypes Stainless Exhaust, Bilstein B6 Shocks, GW U/L Control Arms, Hotchkis Springs Sway Bars, DD HDX Cluster
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