Battery Fit For Gmt 900?

Leadman · May 19, 2011

I've noticed recently that my '08 is taking just a hair longer to start than usual and today after fueling up leaving the radio on it took a little extra cranking. My local auto zone tested the battery. First time it tested fine, but then it was showing bad. He said it should be fine for a few months, but I should look into replacing it.

Anyway, my real question is he said the battery tray has a specially shaped bottom to it that holds the battery in place. His computer was pulling up a couple choices, but others like Optima red top that fit size-wise and power-wise didn't show up in the list and he said it was probably because of the battery tray. Will any battery fit or do you need that special shaped bottom? Are there other better ways to hold the battery down?

I tried searching on this and came up empty.

mhenshaw · May 19, 2011

I have an Optima red top 34r in mine. Any size 34 fits fine and the 34r with reverse posts is perfect for the wires (runs the battery cables over the battery so they won't stick out in the engine compartment)

Leadman · May 19, 2011

I have an Optima red top 34r in mine. Any size 34 fits fine and the 34r with reverse posts is perfect for the wires (runs the battery cables over the battery so they won't stick out in the engine compartment)

Thanks, good info to know. So is your battery strapped down or is that just not a concern?

Wires · May 20, 2011

I have an Optima red top 34r in mine. Any size 34 fits fine and the 34r with reverse posts is perfect for the wires (runs the battery cables over the battery so they won't stick out in the engine compartment)

Thanks, good info to know. So is your battery strapped down or is that just not a concern?

The 34 or 34r still mount down like the OEM one. It's just if you don't get the 34r, the wires run over the top (not a big deal, I did it on mine since Costco didn't have the 34r on the shelf).

quetranpa · May 20, 2011

you know I just replaced mine on my '07 silverado and I put an optima in it and it fits just fine, it is bolted down like the oem was with some pieces on the side, I got it at advance autoparts (same as autozone) so it should show in the computer!!!