#1  
Old 05-18-2025, 07:57 PM
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Scott Stoneburg Scott Stoneburg is offline
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Originally Posted by firechickenman View Post
I'll recommend giving PTC a call too. I've had on of their 10" converters with a mechanical diode in my car for several years and it's been great! Behind my 520, it flashes to 5400 and goes through the traps at 6500 at 137 mph. Slip calculator shows 5%. Drives great on the street too!
I've always been told that a converter with a mechanical diode she note be used for street miles. How often does your car see the street?

  #2  
Old 05-19-2025, 08:20 AM
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firechickenman firechickenman is offline
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I've always been told that a converter with a mechanical diode she note be used for street miles. How often does your car see the street?
I bought this converter second hand. It was spragless at the time. I sent it to PTC to adjust it to my application and I wanted them to put the sprag back in it but they highly recommended I go with the mechanical diode at my power level.

That converter went in at the beginning of the 2016 season and has finished 6 Drag Weeks plus occasional cruise nights. I'll drive it to work a few days a year too. I'd guess 7-8K miles on it. The trans has a diode in place of the intermediate roller clutch too.

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IAIIA 520/pump gas/SD 325 E-heads/266-272 SR cam/1050 Dominator/3.73/ET Street Radial Pro/3300lbs/1.35 60'/[email protected]/[email protected]

Hot Rod Drag Week finishing averages:
2014 - 11.12 @ 118.56
2015 - 10.84 @ 124.97
2016 - 10.56 @ 127.88
2017 - 10.29 @ 130.74
2018 - 10.29 @ 130.53
2019 - 10.16 @ 132.34
2021 - 10.09 @ 132.69 - Quickest Pontiac
2022 - 10.13 @ 133.07
2025 - [email protected] - 2nd place SRBBNA

  #3  
Old 05-19-2025, 06:08 PM
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Scott Stoneburg Scott Stoneburg is offline
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Originally Posted by firechickenman View Post
I bought this converter second hand. It was spragless at the time. I sent it to PTC to adjust it to my application and I wanted them to put the sprag back in it but they highly recommended I go with the mechanical diode at my power level.

That converter went in at the beginning of the 2016 season and has finished 6 Drag Weeks plus occasional cruise nights. I'll drive it to work a few days a year too. I'd guess 7-8K miles on it. The trans has a diode in place of the intermediate roller clutch too.
Cool, thanks for the info

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