Bronze Lifetime
- Messages
- 6,257
- Reactions
- 12,112
First, a group 78 is a side post battery-very very poor connection by design. You could do what I did to end my GM sidepost woes and cut the terminal ends off to put on regular top post cable ends. A group 34 has the same dimensions as a 78 but because it is not a sidepost it has more internal volume by design-meaning more cranking amps and capacity. My advice is dump GM's worst design flaw and upgrade to something else. What do I know? I only sold them for 17years!