Battery Size for 1991 5.0L - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 6 Old 04-21-2012, 11:00 PM Thread Starter
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Battery Size for 1991 5.0L

I know this sounds like a stupid question, but what is the proper size battery that fits in a 1991 Stang? I've seen both 58 series and also 34/78DT series listed for this car. Was the 34/78 a compromise to fit under the hood, since its a more common battery with better options? There aren't many options for 58 series batteries, so I'm guessing this is why people use the 34/78 series. What's the story on this? Or are both batteries correct? What is the difference between these two series of batteries?


My last Mustang - 1981 with 84 351W bored .40, Holley 600cfm vacuum secondaries, Weiand 351 Stealth manifold, 4 speed RUG (3 speed o/d), 8.8 rear with 3.08s, Flowmaster 2 chambers, Crane cam 218/224, Keith Black hypereutectic flat top pistons. Current Mustang: 2014 V6 Convertable.
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post #2 of 6 Old 04-21-2012, 11:04 PM
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a 58 series is the one.the 3478 is a dual post batt mostly for generic fit.for a while i had a 65-850 in my car when i drove it in winter.has to slot the side mounting holes of the tray and chop the 2 legs a bit to clear hood


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post #3 of 6 Old 04-21-2012, 11:09 PM Thread Starter
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Would there be any real issues or problems running a generic 34/78 instead of a 58 series?

My last Mustang - 1981 with 84 351W bored .40, Holley 600cfm vacuum secondaries, Weiand 351 Stealth manifold, 4 speed RUG (3 speed o/d), 8.8 rear with 3.08s, Flowmaster 2 chambers, Crane cam 218/224, Keith Black hypereutectic flat top pistons. Current Mustang: 2014 V6 Convertable.
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post #4 of 6 Old 01-30-2014, 03:42 PM Thread Starter
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Going to bump this thread since I still didn't really get an answer on this. The 58 series batteries are all on the low end of the scale as far as cranking amps, warranty, etc. I'd like to get the 34/78 battery if I can confirm it will fit in a early 90s Mustang with no fitment problems. I'm looking at a Diehard Platinum, which is an AGM battery. The Platinum is a special order, so I need to make sure it will fit in this car. I will only buy AGM batteries now, since we have cold weather up here in Canada, and I also run a power hungry stereo setup.

So again- will a 34/78 fit in a 90-93 Mustang GT?

My last Mustang - 1981 with 84 351W bored .40, Holley 600cfm vacuum secondaries, Weiand 351 Stealth manifold, 4 speed RUG (3 speed o/d), 8.8 rear with 3.08s, Flowmaster 2 chambers, Crane cam 218/224, Keith Black hypereutectic flat top pistons. Current Mustang: 2014 V6 Convertable.
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post #5 of 6 Old 01-30-2014, 10:35 PM
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Any battery will fit in a any car with enough modifying lol. You will probably have to trim the let's onthetray a bit but yea U
You can make it work.I have a 65 in mine
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post #6 of 6 Old 07-26-2015, 04:25 PM
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Quote:
Originally Posted by braxus View Post
Going to bump this thread since I still didn't really get an answer on this. The 58 series batteries are all on the low end of the scale as far as cranking amps, warranty, etc. I'd like to get the 34/78 battery if I can confirm it will fit in a early 90s Mustang with no fitment problems. I'm looking at a Diehard Platinum, which is an AGM battery. The Platinum is a special order, so I need to make sure it will fit in this car. I will only buy AGM batteries now, since we have cold weather up here in Canada, and I also run a power hungry stereo setup.

So again- will a 34/78 fit in a 90-93 Mustang GT?
I'm going thru the same thing right now with mine. Guys are saying the optima isn't the same batteries as years past and yet it cost wayyy wayyy more. Thing is if I went with a 58 agm from a parts store, it still will cost upwards of 180-200 bucks where the optima I priced the other day was about 225 after my discount. I ordered a deka 55 ah agm for my second battery and need one now for the front. I am going to look into things a little bit more tomorrow and make some calls. Might just go with the Duracell 34/78 and trim the tray a little bit on the side. My tray is too short by about , maybe about an inch or so.

95 v6 converted GT/Saleen. Ed per RPM 2, Special custom grind cam courtesy of Shaun Harrelson, TF Heads, 24 lb inj, 75 MM MA, 70 TB, Mac Shorties, Basani X, 2 cha flows. Tuned in 2014 with Chris Tuton. Much much more than what's listed here.(Wrecked in the rear and up for sale)
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