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1. 4L60E/LS1 Input Drum Reinforcement Sleeve w/Overrun Piston & Modified Steel Piston
2. 4L60E Street/Strip 3-4 Clutch Pack
3. LSSeries/4L60E Pro Street Performance Upgrade 1998 & Up
4. 4L60E Road Race/Super Heavy Duty 3-4 Clutch Pack
5. LS1/4L60E Street/Strip Performance Upgrade 1998 & Up


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Pro-Built Automatics :: 4L60E & LS1 Upgrades

4L60E & LS1 Upgrade Kits for "do it yourself" transmission upgrades and repairs. Prices do not include shipping.

4L60E & LS1 Upgrades
4L60E Upgrades
5 Products



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: 1UGRR34CL4L60

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 Street/Strip 3-4 Clutch Pack
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4L60E Street/Strip 3-4 Clutch Pack
Part Number: 2UGSS34CL4L60

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 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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LS1/4L60E Street/Strip Performance Upgrade 1998 & Up
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LS1/4L60E Street/Strip Performance Upgrade 1998 & Up
Part Number: 4UGSSPU4L60

A "somewhat simple" way of getting the 4L60E to hold 575+HP with 10" or smaller diameter torque converter without having the transmission rebuilt. Your transmission must be in good running condition, less than 35,000 original miles or rebuilt recently. Click above link for complete description.

Price: $385.21

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LSSeries/4L60E Pro Street Performance Upgrade 1998 & Up
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LSSeries/4L60E Pro Street Performance Upgrade 1998 & Up
Part Number: 6UGPS4L60

A "somewhat simple" way of getting the LS Series 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/LS1 Input Drum Reinforcement Sleeve w/Overrun Piston & Modified Steel Piston
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4L60E/LS1 Input Drum Reinforcement Sleeve w/Overrun Piston & Modified Steel Piston
Part Number: 8UGHDSTSL4L60

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

Price: $66.75
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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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Sonnax 4th Gear Apply Super Hold Servo 4L60E/LS1
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Sonnax 4th Gear Apply Super Hold Servo 4L60E/LS1
Part Number: SONNAX4thServo4L60E/LS1

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: $81.50
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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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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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