4L60E-PRO ®

Reprogramming Kit ™ Kit Includes Optional Internal

Upgrades. Unit Removal
Fits 1996-2018 except 2005 Corvette Recommended.
Does Not Fit 1993-1995 or Hybrid
If the trans is on the bench, follow
Corrects/Reduces/Prevents instructions for the Pump Ring Kit
3-4 Clutch and 2nd Band Burn-up--Bang, Bump or Slide Bump 1-2, 2-3 Shift & Clutch Spring Kit Supplied.
Reduces code P1870, converter slip/shudder.
Optional Gear Command 1996-2008
Holds Manual 1st--2nd--3rd to any RPM--Backshifts to gear you select.

New Medium Orange New Medium Orange

Step 1
Identify the Type Accum housing you are using
(2nd or 3rd Type), then choose new spacer
New Large Orange New Large Orange
that matches your housing and install it with
new small orange spring. Install new seal on
new 1-2 piston furnished. Lubricate the seal &
install piston with 3 tab side up, followed by New 1-2 Piston New 1-2 Piston
& seal. & seal.
large & medium orange springs as shown.

New Small Orange New Small Orange

Don’t Use
New Short Spacer .315” New Long Spacer .430”
Pin .309 Pin .236
Pin .236
One Single Double stepped
Same spring pocket.
as 700R4 spring pocket.
1st Type 2nd Type 3rd Type
1-2 Accum Housing 1-2 Accum Housing
Check AFL bore for wear first!
If your valve body is worn out, get TransGo # 4L60E-AFL-OS. Requires # 4L60E-AFL-TK

Save the 2nd new larger White

LOOK spring for page 3, step 5.
Make sure Accumulator
spring is not crooked. Step 1. Install the New larger WHITE
spring inside original.

Actuator Valve

Roll pin Reuse WHITE

WHITE This side Step 2. Discard original spring Install

UP
the New small WHITE Accum Spring.
Accum Bushing & Valve

SSB
NEW 1-2 Shift SSA
Reuse Valve & Spacer
Optional Step 3.
Work Trucks & 2009 up Skip This Step!
Do step 3 only if you wish to add: Holds first gear to any speed in
M1 and be able to go back to M1 at ANY speed! Discard original 1-2 shift
valve. Re-use original spring, insert NEW 1-2 Shift Valve, then Spacer, then
Solenoid & Retainer.

Low New Yellow

Step 4.
Remove Cover & Replace
Cover original Low spring with
N-D Accum NEW YELLOW.
Re-use
Step 1. Remove and discard the converter Reg valve, spring and isolator valve.
Save the end plug and clip. Note: If the original outer Valve is in a bushing or it measures
larger than .441” VB has been modified Skip Steps 1, 2 & 3 and reassemble as found.
Original Converter Reg & Isolator Valve Types

Step 2. Insert ISO-CONV Valve into bore. Using hex bolt as 2nd Type
a handle, push valve in and out at least 20 times with slight
side pressure. The valve must fall in and out of bore. Clean the Save 3rd Type
bore. Remove the bolt.

New ISO-CONV valve replaces all of the earlier

factory type Isolator and Converter valves.
BLUE
ISO-CONV Valve

Hex bolt
Reuse Year & Models using Cylinder Deactivation
Recessed End Spacer 2005-07 Buick Rainier 5.3L
Step 3. 2007-09 Avalanche 5.3L
For Normal Use: 2008-09 Avalanche 6.0L
Install BLUE spring & ISO-CONV Valve,
2005-09 Trailblazer, Envoy Denali 5.3L
Models with Cylinder Deactivation: 2007-10 Silverado, Sierra, Suburban,
Install Spacer (Recessed end outward), Yukon, Tahoe, 1500 5.3L
& ISO-CONV Valve. Do not use Blue Spring!
2007-08 Silverado, Sierra, Suburban,
If Cylinder deactivation has been eliminated with a after- Yukon, Tahoe, 1500 6.0L
market tune Install New blue spring & ISO-CONV valve
discarding new spacer.
Always Reuse original End Plug and Clip.
Divider Plug Remove Roll Pin.
Save for Reuse.

Step 4. Remove 3-2 Downshift Valve as-

sembly to access & discard original divider Reuse
New White
plug. Save the roll pin for reuse. Reuse
3-2 Downshift Reverse Abuse
New

Step 5. Using longer threaded bolt, position new divider plug into the bore wiggle to get it started straight
& making sure it installs deep enough for original roll pin to insert thru the hole in the new plug.
Remove threaded bolt and reassemble 3-2 downshift with New White Spring.
Note: High mileage pump with excessive wear at the inboard area of the PR valve bore leads to unstable pressure and broken pump rotor.
TransGo oversized valve part # 4L60E-PR-OS can be used to salvage those worn out pumps. Requires # 4L60-PR-TK

Step 4. Install New Plate & Gaskets

Pump Stator Add this Step for 2009 & Up only. Start Z bolts first to align plate & gaskets to case.
(VB without 3-2 Solenoid) See Page 5 for Solenoid ID.
With a 5/16 Drill chamfer both sides of this hole by
hand. Lay Plate on hard flat surface. Insert Slug into
hole & gently whack it with a Hammer on both sides Z
Slug

New Regulator
Middle land is undersized to add
additional lube oil
New Spring Seat Step 1.
Remove original Boost Valve &
Bushing, Main Regulator Valve, A
spring and bumper spring. B
Install NEW parts furnished as
ORANGE
shown.
Bumper C
With converter stall of 2800 or lower
Skip Step 2
ORANGE New Small
Main Regulator Step 2. Screen Here
High Stall Converter only.
(Above 2,800)
Alum Enlarge holes as listed. PRO
Spacer A .093 (2nd) Z TransGo
B .136 (3rd)
C .125 (4th)
Boost Valve New Large
Screen Here
Step 3. EPC Screen Fix DRILL Restricted
Largest screen in VB plate. Sides of screen suck
Normal
together causing low line pressure with high Flow
Boost Bushing
throttle. Burns clutches and band.
Wire Spacer will keep screens apart.
Additional safety: Drill four .040 to .047
Snap Ring or two 1/16” holes thru top of screen.
WIRE SPACER
 Step 1.
© VB Install Six 1/4” check balls as shown.

EPC Location

TCC PWM
Solenoid

© ©
© SSB

©
SSA

© ©
3-2 Solenoid

No ball here.

New Yellow
& Red WARNING: Wrong Bolts locks Gear Train.
Step 2. 4th Accumulator Valve Body Bolt Guide.
Discard original Spring. Install original guide Pin into
Case first. Install original piston as shown followed by
Yellow & Red Springs regardless of how it came apart.
A 10 MM 3 A bolts

B 8MM 3 B bolts
Step 3. Case- One check ball here.
C 10MM 9 C bolts

D 10MM 2 D bolts
Step 1. Disassemble Servo as shown discard the original 2nd
piston & housing Install the New supplied 2nd Piston & Housing
using the new Rings & Seals provided.

New Large & Small GOLD band adjust shims. Use

Teflon Rings none, 1 or 2 to adjust band. BLUE
O-ring
Housing

Reuse BLUE

Wire
Retainer
Reinstall snap ring Reuse
Shaft must turn both ways
by hand. One way turns 2nd Piston 4th Piston: TALL
harder than the other way
and that is OK.
Step 2. Install BLUE cushion spring inside the knob towards cover. Cover
original cushion spring and reassemble. RED
O-ring

Step 3. Band Adjust: Install 2nd Piston and housing into the trans. Install 2 GOLD shims against housing. Install 4th Piston and cover
without Blue O-ring. Install wire retainer. Check band by wiggling it front to rear 1/8” or more. (See below) Final Check– You must be able to
turn driveshaft both ways by hand in Neutral. If too tight remove one shim, and test again. Then remove and install cover with BLUE O-ring.

Check Band Clearance:

Through the opening in Case, with a Screwdriver
make sure the Band wiggles on drum front to rear.