Sam Harris
Supporting Member
TBH, I’m not seeing the same exact kit I bought a year or so ago. They may have changed it up a bit. I’ll have to dig up my invoice to see..Hmmm...this is from Oregon Performance Transmisduon, the one you linked. I was surprised to hear it’s supposed to help on the 3-4 shift since my understanding is that’s it the second gear servo and this just helped the 1-2 shift.
PRODUCT DETAILS
Sonnax 2nd gear "Corvette" ratio servo kit 77701-04K provides increased apply area resulting in improved holding power for firmer 1-2 and 3-4 shifts. The servo piston features D-rings in place of the OE seal rings for improved sealing during apply and release. This kit is compatible with Sonnax 4th gear Super Hold dual servo assembly 77767K. Features & Benefits: Upgrade used for high performance or heavy-duty towing applications. Improved D-ring sealing configuration.
My trans builder Performabuilt says it’s just to increase the second gear “apply pressure” which results in a firmer 1-2 shift.
Yeah, I looked up my invoice and it’s not listed as available anymore. Huh.
https://www.oregonperformancetransm...Code=OPTI&Screen=PROD&Product_Code=OPT-CV-Pin
Description from my order is: “ OPT-CV-Pin Corvette Servo Piston & Long Pin 700R4 4L60E 4L65E 4L70E 4L75E Automatic Transmission 2nd Gear”
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