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1. PWM Eliminator valve
2. 4L60E Corvette Servo w/Viton seals
3. 4L60E Pro Street or Strip Only 3-4 Clutch Pack
4. Trans-Go Modulator Vacuum/Boost Bypass
5. 4L60E Input Drum Reinforcement Sleeve w/Machined Overrun Piston, Seals & Modified Steel Forward Piston


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Pro-Built Automatics :: 4L60E Upgrades

4L60E Upgrade Kits for "do it yourself" Transmission upgrades and repairs. Prices do not include shipping.

4L60E Upgrades

4L60E Street/Strip Performance Upgrade 1993 & Up
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4L60E Street/Strip Performance Upgrade 1993 & Up
Part Number: 1SSPUG4L60

A "somewhat simple" way of getting the 4L60E to hold up to over 575+HP without having the whole unit rebuilt, your transmission must be in good running condition, (rebuilt recently) or less than 35,000 original miles. Click above link for complete description.

Price: $385.21

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4L60E Pro Street Performance Upgrade 1993 & Up
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4L60E Pro Street Performance Upgrade 1993 & Up
Part Number: 2PSPUG4L60

Finally, a "somewhat simple" way of getting the 4L60E to hold up to more than 650+HP without having the whole unit rebuilt, your transmission must be in good running condition, (rebuilt recently) or less than 35,000 original miles. Click above link for complete description.

Price: $460.32

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4L60E Pro Street or Strip Only 3-4 Clutch Pack
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4L60E Pro Street or Strip Only 3-4 Clutch Pack
Part Number: 3UGPS34CP

This 3-4 clutch setup has proven to last longer in high horsepower/torque combinations than any other 3-4 clutch setup so far. This setup is a "must" for high horsepower applications. Giving the longest life with the Trans-Go "modified" Performance Shift kit.

Price: $89.16
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4L60E Pro Street Elite 3-4 Clutch Pack
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4L60E Pro Street Elite 3-4 Clutch Pack
Part Number: 3UGPSE34CP

This 3-4 clutch setup is the ultimate in handling high horsepower/torque, more than any other 3-4 clutch setup out there. The Trans-Go "modified" Performance Shift kit with 2-3 WOT shift modifications along with a Sonnax 2nd apply Super Servo is a must for holding "high horsepower".

Price: $109.16
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4L60E Raybestos Modified 3-4 clutch Z-Pak
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4L60E Raybestos Modified 3-4 clutch Z-Pak
Part Number: 3UGRAYMOD34PAK

This "modified" 3-4 clutch Raybestos Z-Pak now contains 16 instead of the 14 one sided clutches in the standard setup. Since "coning" cannot be prevented due to the "dynamics" of the 3-4 clutch apply, the additional clutches will give more capacity, handles more torque & horsepower.

Price: $78.81
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4L60E Street/Strip 3-4 Clutch Pack
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4L60E Street/Strip 3-4 Clutch Pack
Part Number: 6UPSS34CP

This is a "proven" 3-4 clutch setup. Works very well in Street/Strip applications, where durability & capacity are both needed for Hi-Performance conditions.

Price: $81.81

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4L60E Road Race/Super Heavy Duty 3-4 Clutch Pack
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4L60E Road Race/Super Heavy Duty 3-4 Clutch Pack
Part Number: 7SKU2324

This 3-4 clutch setup has worked very well, where many 2-3 upshifts and 3-2 downshifts occur in rapid succession, this is known as "cycling", & where more heat than normal is generated. This requires thicker steels to act as a "heat sink".

Price: $73.69

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4L60E Corvette Servo w/Viton seals
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4L60E Corvette Servo w/Viton seals
Part Number: 8UGCORSERVO

This servo will improve 2nd & 3rd gear shifts at part & wide open throttle. Comes with Viton apply seals & OE cover & guide seals. This servo is stock in all LS1's & 1994-96 Impalas.

Price: $20.55

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4L60E Trans-Go .500 Main/Intermediate/Reverse Boost Valve
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4L60E Trans-Go .500 Main/Intermediate/Reverse Boost Valve
Part Number: 9UG500BV4L60

.500 Valve & Bushing: Gives up to 236 psi at WOT. A must for all HD & HP applications. This valve comes in the Trans-Go Performance Shift kit.

Price: $23.66
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Overrun 2-3 Shift Valve 4L60E 1993 & Up
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Overrun 2-3 Shift Valve 4L60E 1993 & Up
Part Number: OVERRUNVALVE4L60E

Now you can use D3 to race without the overrun clutches coming on, on the 2-3 shift and diverting 3rd gear apply oil, (can result in a 2-3 "flare") as in all 4L60E's. This valve will allow overrun clutches to be on from the start in D1, D2 & D3. "No more" robbing clutch apply oil on the 2-3 shift.

Price: $35.00
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4L60E Turbulator Low/Reverse & Reverse Input Low Drag Steels
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4L60E Turbulator Low/Reverse & Reverse Input Low Drag Steels
Part Number: SKU3885

These turbulator "low drag" low/reverse & reverse input low drag steels, can be retrofitted to any pre 1996 4L60E's that did not have them originally. A very useful update, with no side effects.

Price: $19.80

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Sonnax 4th Gear Apply Super Hold Servo 4L60E
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Sonnax 4th Gear Apply Super Hold Servo 4L60E
Part Number: SONNAX4thServo4L60E

This is the largest fourth apply servo for the 4L60E. With over 650HP, this servo is what you need to make WOT 3-4 shifts. Has the capability to give you the quickest 3-4 WOT shift. Will work with the stock 2-4 band.

Price: $79.50
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PWM Eliminator valve
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PWM Eliminator valve
Part Number: UGPWMELIMINATOR

This eliminates the PWM that is hard on the torque converter clutch. This valve changes the setup to the early on/off valve pre 1995. This valve will let you use any style of lockup clutch plate. This valve measures .440" in diameter. If you have a rebuilt trans from GM (SRTA) it will most likely...

Price: $8.67
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Sonnax 2nd Gear Super Hold Servo
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Sonnax 2nd Gear Super Hold Servo
Part Number: UGSonnax2ndServo4L60E

With 650HP+, this servo is a excellent upgrade when trying to keep the balance of smooth part throttle shifts and firm WOT shifts. Retains the desired cushion springs, is much easier on the drivetrain, as opposed to the "billet" servo, which can be very hard on parts.

Price: $101.50
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4L60E Input Drum Reinforcement Sleeve w/Machined Overrun Piston, Seals & Modified Steel Forward Piston
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4L60E Input Drum Reinforcement Sleeve w/Machined Overrun Piston, Seals & Modified Steel Forward Piston
Part Number: UGSTSL4L60E

The input drum can get into trouble at around 550-600 FWHP. The input shaft can split the aluminum input drum open. The Input Drum Reinforcement Sleeve prevents splitting the input drum open. Comes w/machined overrun piston, seal & modified steel piston. For off road & drag racing. Installs easil...

Price: $66.75
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Trans-Go Modulator Vacuum/Boost Bypass
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Trans-Go Modulator Vacuum/Boost Bypass
Part Number: UGVMBYPASS4L60

Required when using Trans-Go vacuum modulator with super or turbo charger on any LS1 or 4L60E. This vacuum/boost bypass prevents boost pressure from damaging the vacuum modulator.

Price: $24.75
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