what gear?
02-18-2014, 08:17 PM
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Engine: 406 sbc, dart iron ea
what gear?
I am on the last part of my car finally. its time to get a rearend. i have a 406 with dart iron eagle heads, stock crank and rods with forged flat top pistons can is a comp 306 s 290/307, Lift .510/.540, harland sharp 1.5 roller rockers and a victor jr intake. im building a power glide for it now and running a 28 inch tire. i would like to shift around 6 grand. what rear gear do yall suggest?
02-18-2014, 08:53 PM
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Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: what gear?
At only 6k rpm with a 28" tall tire, 3.73 or 4.10 will be fine. If you were pushing the rpms into the 7000 range, 4.56 would be better. No matter what ratio, you pick, be prepared to try a different ratio. The same ratio with a different stall speed can affect the outcome.
My converter stalls at 6000 rpm. I switched from 4.86 to 4.57 gears and the car hated it. The 4.57 gears needed a different stall speed to work well. I went back to 4.86 gears and the car loved them. I also use 32" tall tires and shift around 7500 rpm.
My converter stalls at 6000 rpm. I switched from 4.86 to 4.57 gears and the car hated it. The 4.57 gears needed a different stall speed to work well. I went back to 4.86 gears and the car loved them. I also use 32" tall tires and shift around 7500 rpm.
02-18-2014, 09:01 PM
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Engine: 406 sbc, dart iron ea
Re: what gear?
yea thats what i was thinking. i am gonna send my converter off to fti so they could go thru it. this is my first bracket car and i am just looking for something in high 11 low 12 range.
02-18-2014, 09:11 PM
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Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: what gear?
Converter needs to match the camshaft for best performance. It should stall about 500 rpm into the powerband for a street/strip car and 1000-1500 rpm into the powerband for full race. Everything else behind the converter needs to compliment it.
You can have three converters that all stall at the same speed but all react differently. Loose and tight is just as important as stall speed.
Torque converters are really something that you can say you get what you pay for. My race converter was worth around $1200. Inexpensive converters are inexpensive for a reason and without having one opened up to see the internal parts, you'll never know why.
You can have three converters that all stall at the same speed but all react differently. Loose and tight is just as important as stall speed.
Torque converters are really something that you can say you get what you pay for. My race converter was worth around $1200. Inexpensive converters are inexpensive for a reason and without having one opened up to see the internal parts, you'll never know why.
02-18-2014, 09:16 PM
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Converter needs to match the camshaft for best performance. It should stall about 500 rpm into the powerband for a street/strip car and 1000-1500 rpm into the powerband for full race. Everything else behind the converter needs to compliment it.
You can have three converters that all stall at the same speed but all react differently. Loose and tight is just as important as stall speed.
Torque converters are really something that you can say you get what you pay for. My race converter was worth around $1200. Inexpensive converters are inexpensive for a reason and without having one opened up to see the internal parts, you'll never know why.
You can have three converters that all stall at the same speed but all react differently. Loose and tight is just as important as stall speed.
Torque converters are really something that you can say you get what you pay for. My race converter was worth around $1200. Inexpensive converters are inexpensive for a reason and without having one opened up to see the internal parts, you'll never know why.
Sent from my XT907 using IB AutoGroup
02-18-2014, 09:16 PM
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Engine: 406 sbc, dart iron ea
Re: what gear?
yea fti builds converters for application specific. i think my dad had around 12 in his fti converter. they seem like good people and customer service was great so they are gonna get my money. im just looking to be consistant not blow the doors off anything and i think they can help me with that.
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