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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Battery - Will Group 78 fit stock batter tray?

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Battery - Will Group 78 fit stock batter tray? Empty Battery - Will Group 78 fit stock batter tray?

Post by 76 Malibu Mon Jun 24, 2024 8:42 pm

The battery on my car went dead today.  It was just over 10 years old, so not a bad run.  I currently have a group 35/75 dual post battery.  Will a Group 78 battery fit the stock batter tray?  It looks like the tray has extra space. There is a lot more selection for Group 78 batteries and I can get a bit more power.
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Post by S3TPI Tue Jun 25, 2024 8:47 am

I put the bigger battery in my car. It fits the tray fine, but you have to loosen the fender brace to get it in or out.
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Post by 76 Malibu Tue Jun 25, 2024 2:32 pm

You don't happen to know it it's a group 78? It should say on the battery. I pulled the old Group 75 battery and it looks like a Group 78 will fit as the battery tray is roughly 10.5" wide, vs 10.25" for a Group 78 battery. I am going to try and stop at Costco and pick one up tomorrow.
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Post by S3TPI Tue Jun 25, 2024 2:48 pm

I believe it is a 78. I'll go take a look to be sure.
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Post by S3TPI Tue Jun 25, 2024 7:40 pm

Battery - Will Group 78 fit stock batter tray? Batter10
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Post by S3TPI Tue Jun 25, 2024 7:41 pm

Sorry it's upside down. But, you can see what it is.
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Post by 76 Malibu Tue Jun 25, 2024 9:10 pm

Perfect. That is a group 78. I should be good then. Thank you very much!
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Post by S3TPI Wed Jun 26, 2024 7:30 am

No problem!
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Post by 77camino Wed Jun 26, 2024 8:09 am

There are only a couple sizes of side post batteries made and any of them will fit our cars. Originally they all had the larger case size but over the years they started making the batteries smaller for more universal fit. I agree that you will have to move the fender brace to get the larger one in but it will definitely fit.
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