When did GM start using Corvette servo in A4?
TECH Resident
Joined: Jan 2002
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From: Poway, Ca. where GOD and the sun always shines
I am by no meens an expert on this, however if I understand how these upgraded servos work, they allow more transmission fluid to pass through them, and have a larger surface plate which allows the increased line pressure for a crisper shift.
If I am off base, I would appreciate someone setting me straight.
SteveC
If I am off base, I would appreciate someone setting me straight.
SteveC
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Verdad Gallardo TECH Resident
Joined: Jan 2002
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From: Poway, Ca. where GOD and the sun always shines
I can assure you gentlemen that I did not have the Corvette servo in my 2001 Z28. It was verified by the transmission shop that installed my converter. They removed my stock one, disassembled it and showed me the Corvette unit plus a Superior super servo, and asked me which one I wanted. I chose the Superior unit, it was an additional $95 to purchase.
SteveC
SteveC
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From: Wichita, KS - 1400' above sea level ;-)
From the TCI website (halfway down the page):
http://www.tciauto.com/gm/gm_4L60E.htm
originally said by TCI's website:
Note: This servo assembly is already factory installed in C4 & C5 Corvettes and 1993 - Up LT1/LS1 equipped F-body vehicles.
Note: This servo assembly is already factory installed in C4 & C5 Corvettes and 1993 - Up LT1/LS1 equipped F-body vehicles.
Staging Lane
Joined: Apr 2002
Posts: 67
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From: The Motor City Area
Originally Posted by SteveC
I can assure you gentlemen that I did not have the Corvette servo in my 2001 Z28. It was verified by the transmission shop that installed my converter. They removed my stock one, disassembled it and showed me the Corvette unit plus a Superior super servo, and asked me which one I wanted. I chose the Superior unit, it was an additional $95 to purchase.
SteveC
SteveC
The 4L60E's in F-cars and Corvettes have had that servo since the LT1 days. The 2/4 band is applied and released by a hydraulic servo, consisting of fluid pistons and a pin to act against the band. In the "corvette" servo, the 2nd apply piston has a surface area about 35% greater than the standard version. So for the same fluid pressure applied, you get more force on the piston/pin, and therefore more clamping force on the band. You feel this as a "crisper" 1-2 shift.
TECH Resident
Joined: Jan 2002
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From: Poway, Ca. where GOD and the sun always shines
They are a VERY reputable shop, I ended up going with the Superior Super Servo, which had a larger surface than the Corvette unit. My original servo unit that was in my vehicle was different than the covette unit.
SteveC
SteveC
