Allison 1000 6-Speed Transmission Assembly with PTO for 2013 Chevrolet & GMC
Product Notes Read before buying
This is an Allison 1000 6-speed automatic transmission for 6.6L Duramax Diesel engines. It fits ONLY 2-wheel drive (4x2) models equipped WITH the Power Take-Off (PTO) option. It will NOT fit 4x4 models or trucks without the PTO provision.
Voice or type your vehicle details and Wrenchy will confirm fitment in seconds.
Vehicle Fitment Guide
This part fits the following vehicles:
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| 2013 |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| LT | Cab & Chassis | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| LT | Crew Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| LT | Extended Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| LT | Standard Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| LTZ | Crew Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| LTZ | Extended Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| WT | Cab & Chassis | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| WT | Crew Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| WT | Extended Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| WT | Standard Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Denali | Crew Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| SLE | Cab & Chassis | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| SLE | Crew Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| SLE | Extended Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| SLE | Standard Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| SLT | Crew Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| SLT | Extended Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| WT | Cab & Chassis | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| WT | Crew Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| WT | Extended Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
| WT | Standard Cab Pickup | 2013 | V8 6.6L DIESEL Turbo | RWD | Automatic |
Know This Transmission Before You Buy
The research behind our purchase interview — recalls, bulletins and real install economics for this transmission family:
A quick look at your own vehicle makes sure the right transmission shows up:
- Locate the metal ID tag on the right rear side of the transmission case and confirm the broadcast code is 3BCH and the GM Part Number is 24258553.
- Physically confirm the truck is Rear-Wheel Drive (2WD/4x2) with no front differential, front driveshaft, or transfer case.
- Confirm the 8th digit of the VIN is 'L' (6.6L Duramax LML diesel engine).
- Check the passenger side of the current transmission case for a 6-bolt or 10-bolt PTO access plate or attached PTO drive unit.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Heavy-duty transmission jack (minimum 500 lbs capacity)
- 32mm socket (for electrical harness connector)
- Transmission cooler line quick-disconnect tools
- Engine support bar
- Long extensions for bellhousing bolts
- Torque wrench
Budget for these consumables at install:
- Castrol TranSynd 668 or any TES 668 / TES 295 approved full-synthetic heavy-duty fluid (DEXRON-VI is also compatible)
- External spin-on filter (Allison Part #29539579) and internal pan suction filter with new pan gasket
- Front pump / torque converter seal
- High-pressure chemical transmission cooler and line flush
What your vehicle’s computers will need after the swap:
What’s involved: TCM Adaptive Relearn (Fast Learn and Drive Learn cycle)
A TCM adaptive reset and 'Fast Learn' procedure is mandatory using a GM Tech 2, GDS2, or equivalent professional diagnostic scan tool. This must be followed by a strict 'Drive Learn' cycle before subjecting the transmission to heavy loads.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: The converter must fully engage multiple splines and drop back three distinct times. If not fully seated, bolting the transmission to the engine will crack the pump housing.
- The 'Double O-Ring' Filter Disaster: Ensure the old external spin-on filter's magnet and rubber gasket/O-ring are removed before installing the new filter to prevent blowouts.
- Extreme Cooler Line Pressure: The Allison 1000 runs up to 220+ PSI. Use only high-pressure rated lines (minimum 300 PSI) and ensure quick-disconnect clips are fully seated.
- TCM Adaptive Relearn: Do not drive the truck hard immediately. Reset the TCM adaptives and perform the drive learn cycle to avoid burning up the C1 and C3 clutch packs.
- Driveline Magnet: Transfer the round magnet from the top of the old external spin-on filter to the new filter before installation.
Easy to get right once you know them:
- Ordering the wrong drivetrain configuration (4WD vs. 2WD). Converting a 2WD to a 4WD requires complete disassembly to swap the main output shaft.
- Ignoring the PTO provision. Ensure your truck's PTO requirements match the replacement unit's internal drive gear.
- Reusing the old torque converter, which acts as a trap for metal shavings and will contaminate the replacement transmission.
- Skipping the transmission cooler and line flush, leading to immediate contamination of the new unit.
- Using cheap or incorrect multi-vehicle ATF instead of licensed TES 668/295 or Dexron VI fluid.
Not issues with the units on this page — the manufacturer documented these for every transmission of this family, wherever you buy one. Handy for your installer:
🔎 Recommended at install: Replace sticking Torque Converter Clutch (TCC) solenoid or valve inside the valve body.
🔎 Recommended at install: Address internal pressure loss or sticking valves in the valve body.
🔎 Recommended at install: Rebuild or replace internal thrust bearing or clutch piston to prevent metal contamination.
🔎 Recommended at install: Replace the rear electrical pass-through connector seal to prevent fluid wicking.
🔎 Recommended at install: Replace torque converter and worn clutch packs (C2/C3).
🔎 Recommended at install: Inspect and replace steering column components to prevent rollaway risk.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-04892-2513793). Unit-specific details — mileage, condition, warranty, freight — are covered in the checkout interview.
Policies, in plain English.
Shipping & Handling
- Ships by LTL freight on a pallet — a real freight truck, not a parcel van
- Your checkout freight quote covers delivery to your door (liftgate service included for residential addresses)
- The carrier calls ahead to schedule a delivery window — someone must be present to receive it
- Typically palletized and picked up within 2–3 business days; transit time depends on distance
120-Day Warranty
This part includes a 120-day warranty.
- If the part fails within the warranty window, we'll replace it or refund per the coverage terms
- Coverage is parts-only — installation labor is not included
- Warranty covers defects — not installation errors, misuse, or damage after installation
Your pre-purchase interview reviews these exact terms with you before anything is charged.
Returns (30 Days)
We accept returns of uninstalled parts within 30 days of delivery for this part.
- Defective parts: We will replace the part or issue a refund at our discretion
- Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
- Return shipping: This part ships by freight (LTL) — the part price is refundable per the terms above, but shipping costs are non-refundable and return freight follows the seller's return terms. Your pre-purchase interview walks through the exact numbers before you buy
- Parts must be returned in original packaging and unmodified condition
- Poorly packaged returns that arrive damaged will not be credited
Damaged in Shipping?
Freight damage is rare — and you're fully protected when you do two things at delivery:
- Inspect before you sign — you're allowed time to look the pallet over while the driver waits
- Write any damage on the delivery receipt before signing — that one line is what makes a freight claim succeed
- Severe damage? Refuse the delivery — it goes back at no cost to you and we make it right
- Photograph the pallet before unwrapping; report concealed damage within 24 hours of delivery
We handle the carrier claim — you just help document it. Your pre-purchase interview walks through this checklist too.
Order Cancellation
Cancel before shipment for a full refund. Once the pallet has been built, a preparation charge may apply — and once the freight carrier picks it up, shipping costs are non-refundable and standard return terms apply. Your pre-purchase interview shows the exact numbers before you pay.
Expert Guides
Related Trouble Codes (OBD-II)
39 matching guidesIf your scan tool is showing one of these trouble codes, this part is a common fix. Each guide explains the code, how to diagnose it, and exactly what to replace.
Miscellaneous Information
OEM Part Numbers:
GM: 19258045, 24256743, 24258552, 24258553
Other: 3BCH
Fits Years: 2013
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This unit ships with the selling yard's 120-day warranty. Longer plans can be requested during checkout.
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