LS1 4L60E Pro Street w/vacuum modulator :: 4L60E :: General Motors :: GM Transmissions

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Pro-Built Automatics :: GM Transmissions :: General Motors :: 4L60E :: LS1 4L60E Pro Street w/vacuum modulator

LS1 4L60E Pro Street w/vacuum modulator

Starting at the "Front Pump", new (late design) seal, Teflon bushing, 10-vane rotor/slide assembly, Trans-Go Hi-Rev steel rings & priming spring, Trans-Go HD pressure regulator spring and bumper spring, Trans-Go .532/.500 boost valve, both halves of pump machined flat with rotor to pump clearance set at .0015"-.002", and new stator support. This pump now will keep the pressure & volume up to 7,800 rpm.

Reverse Input Drum: A reworked or new reverse/input drum, along with the Turbulator low-drag steels, and Borg Warner clutches. The Belville spring is replaced with a waved spring, this eliminates the Belville spring from eating the reverse/input drum.

Input Drum: The stock input drum starts getting into trouble at around 575 to 600 HP with a 10" or smaller diameter torque converter. I add a steel sleeve and remachine the overrun piston to prevent splitting the drum open from high loads. New latest design 29 element input sprag, Borg Warner clutches for the overrun and late design Borg Warner forward clutch assemblies, 9 Borg Warner Hi-Energy clutches along with Kolene steels used in the 3-4 clutch pack, Trans-Go (Hi-Rev) heavy duty springs replace the OEM 3-4 and forward springs and 3-4 helper springs (the Trans-Go springs prevent the 3-4 clutches from getting into trouble, due to centrifugal clutch apply. Good for up to 7,800 rpm, stock setup starts getting into trouble at around 5,000 rpm), clearance for the 3-4 clutch pack .025" -.035".

Rear Drive Section: Hand picked input sun gear, forward planet with batwing thrust washers, input internal gear, reaction carrier shaft with "roller" bearing instead of metal thrust washer, a new GM heat treated sun shell, the latest design Borg Warner low/reverse roller assembly. Turbulator low-drag steels, Borg Warner clutches, hand picked, or new rear planet, hand picked reaction sun gear, internal reaction gear, internal reaction gear support, a bronze rear case bushing, Teflon extension housing bushing, and a Vamac (prelubed) rear seal.

2-4 Band & 2-4 Servo: Borg Warner Hi-Energy 2-4 band, new Corvette 2nd gear apply servo used in conjunction with the latest design Viton seals. An additional spring is added to the cushion side of the servo to help provide a smoother 1-2 apply at light throttle while still allowing a firm WOT shift.

Valve Body: We use the "Modified" Trans-Go Performance Shift kit in conjunction with the large boost valve, Corvette servo, and the 9 clutch 3-4 pack. (This setup has proven to be the most reliable). We work with the accumulators to give the best possible part throttle shifts, and progressively firmer shifts with more throttle opening. The vacuum modulator replaces the EPC solenoid. Allows for instant response in line rise to match engine torque. Eliminates the delay, when a downshift is needed now, and not a second and a half later. A Sealed Power (zero-leak) filter is used.

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Part Number	LS1 4L60E w/modulator
Price:	$2,025.00

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