PPE Valve Body Recalibration Kit – Allison 1000

Installation guide for the PPE valve body recalibration (VBR) kit, part #128043000, for the Allison 1000 series (LLY/LBZ/LMM) behind 2001-2010 GM 6.6L Duramax engines. The VBR kit installs from the bottom—no transmission removal—and corrects shift complaints for short, crisp shifts.

Download the Original PDF Manual

PPE Valve Body Recalibration Kit contents for Allison 1000 (#128043000) — VBR Kit contents (#128043000) — new Trim Valves, outer springs, small inner springs, check balls and the furnished .125″ drill bit.

Applications

2001–2010 GM 6.6L Duramax with Allison 1000 series transmission
LLY / LBZ / LMM engine codes

What the VBR Kit Fixes

The valve body recalibration kit reduces or eliminates common driving complaints and delivers short, crisp, consistent shifts:

Goes to neutral under high load
Will not drive forward / backwards
Sticks in one gear
Sets trouble codes

IMPORTANT: Install the VBR kit before adding horsepower to help prevent internal transmission damage. The kit installs from the bottom of the transmission — no transmission removal is required.

Installation

Step 1 — Drain the Fluid

Drain the transmission fluid from the oil pan.

Allison 1000 transmission with oil pan — The VBR kit is serviced from the bottom of the Allison 1000 transmission.

Step 2 — Remove the Oil Pan and Valve Body

Remove the oil pan (12× 13 mm bolts).
Remove the Valve Body (VB) from the transmission.

Step 3 — Replace the Trim Valves

Discard the original Trim Valves and the springs on the small end.
Insert the new balls and small springs into the small end of the new Trim Valves. Use TransJel or Vaseline to hold them in place.
Place the new outer springs over the small end of the Trim Valves and install them into the Valve Body. Do not force them — a little “wiggling” and they will slide in.
Install the outer spring on the “A” Solenoid Valve.
Install the Solenoid Valves and Solenoids into the Valve Body.

Trim Valve A and Trim Valve B with outer spring, small inner spring and check ball — Trim Valve “A” and Trim Valve “B” — each with its new outer spring (red), small inner spring and check ball.

Assembly diagram of Trim Valve A and B O-rings on the valve body — Assembly diagram — Trim Valve “A” uses the **green** O-ring, Trim Valve “B” uses the **black** O-ring. Re-use the original outer spring as shown.

Step 4 — Enlarge the Separator Plate Holes

Enlarge the two marked holes on the separator plate using the smaller .125″ drill bit furnished in the kit.

Separator plate diagram showing the two holes to enlarge — Separator plate — the two holes marked in red are the holes to enlarge.

Close-up of the two marked holes and drilling with the .125 inch bit — Enlarge the two holes marked in red with the .125″ drill bit.

NOTE: Push the Solenoids firmly into the Valve Body when installing the Solenoid Bracket.

Step 5 — Install the Solenoid Bracket

Push the Solenoids firmly into the Valve Body while installing the Solenoid Bracket.

Installing the solenoid bracket onto the valve body — Step 5 — seat the Solenoids and install the Solenoid Bracket.

Step 6 — Pressure Switch O-Rings

The pressure switch installation must have six O-Rings.

Pressure switch installation with six O-rings on the valve body — Step 6 — confirm all six O-Rings are present on the pressure switch.

Step 7 — Set the Link

Place the link into the valve groove.

Placing the link into the valve groove — Step 7 — seat the link into the valve groove.

Step 8 — Slide in the Valve

Slide the valve into the Valve Body to hold the link in place.

Sliding the valve into the valve body — Step 8 — slide the valve into the VB to hold it in place.

Step 9 — Install the Tube

Install the tube after the Accumulators and Solenoid Brackets (1× long gold bolt).

Installing the tube with the long gold bolt — Step 9 — install the tube (1× long gold bolt) after the Accumulators and Solenoid Brackets.

Step 10 — Reassemble

Install all bolts back into their original locations and complete the assembly by installing the Valve Body back into the transmission case.

Reinstalling bolts and the valve body into the transmission case — Step 10 — return all bolts to their original locations and reinstall the Valve Body.

Step 11 — Refill with Fluid

IMPORTANT: Do not start the engine unless the transmission has been filled with transmission oil — minimum 16 quarts with a shallow pan, 18 quarts with a heavy-duty deep pan (such as a PPE aluminum pan).

Valve Body Reference

Use the diagram below to confirm valve and solenoid orientation. Note the “A line up” and “B line up” positions when replacing the valves.

Transmission Relearn

IMPORTANT: A relearn is required after installing the PPE VBR kit, and any time you add horsepower or service the pump, valve body or clutches. The Allison 1000 uses an adaptive strategy that constantly adjusts shift clutch pressures to match engine torque and vehicle load, so it must re-learn after the change.

To perform the relearn:

Make at least 6 sets of light-throttle upshifts through all gears.
Make six sets of shifts at 1/3 throttle, then 1/2 throttle, then 3/4 throttle, and so on.
Treat downshifts the same way — start with light throttle and work up to full throttle.
When the shifts are quick and smooth, press the Tow/Haul button and start the relearn over.

NOTE: During the relearn, expect some clunks, bumps and shift flares — especially during the 3-4 shift. Bumps and flares are normal during the relearn.

The relearn takes about 2 hours. This can be greatly reduced by using PPE’s Xcelerator tuner and performing its Fast Re-learn feature.

Why the Relearn Matters

The truck’s computer continuously watches and records how the transmission behaves — for example, how long each gear change takes under various conditions. It calculates engine torque from inputs such as fuel consumption, boost pressure, air density, temperature and throttle position, then uses that data to estimate the load being accelerated and to calculate the optimum gear-change apply rate.

A perfect shift is as short in time as possible with minimum feel and stress on the drivetrain. For every gear change the system must release one gear and bring on the next. If the release and apply timing is wrong for a given torque and load, slipping or bind-up (two gears at the same time) can occur — both of which can cause major damage, including clutch failure. Allowing a full relearn lets the computer re-optimize this timing for the recalibrated valve body.

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