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TCI Transmission Upgrade - Putting Your Rear in Gear

Part I: TTP Installs A Brand-New TCI 4L60E In Our LT1 Formula
By Scott Parker
Photography by Scott Parker
Tci Transmission Upgrade  Tci Transmission Upgrade
The Formula's 4L60E had so many miles on it that simply putting in a shift kit was no longer feasible. Since it is a daily driver and reliability is a chief concern, the Pontiac was given a clean slate with the TCI Super StreetFighter 4L60E. TCI says this tranny will hold up to 600 hp, naturally aspirated, and it has proven reliable on greater than 525 hp with nitrous, thanks to Alto Red Eagle clutches, Kolene treated steel plates, improved lubrication, high line pressure, and many more hi-po features. A manual/automatic valvebody allows manual shifting-and use of the fully automatic function. Each unit is blueprinted, inspected, and dyno-tested to ensure quality before leaving TCI's facilities.
Tci Transmission Upgrade
The converter of choice was TCI's Saturday Night Special. Although it carries many of the same features as its other high- quality converters-including furnace-brazed fins, a hardened pre-ground pump hub, and computer balancing-the Saturday Night Special is considered an entry-level converter because it carries a 2,000 to 2,200 stall speed. A looser converter would have yielded better performance for sure, but since driveability and gas mileage are a concern, we kept it conservative for this round of mods. Once the Formula graduates to engine mods, we may trade this 12-inch lockup converter for a 10-inch 3,200- to 3,500-stall converter like the StreetFighter.

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