Shop 4L80E Parts →
The 4L80E is a heavy-duty four-speed automatic behind 3/4-ton and 1-ton GM trucks, vans, and a lot of swaps. It is essentially a modernized, electronically controlled TH400, which is why it takes abuse well and why it is worth rebuilding rather than tossing. But "worth rebuilding" and "cheap to rebuild" are not the same thing. This unit is big, it holds a lot of fluid, and the good parts cost real money.
Here is the short answer: a professional 4L80E rebuild in 2026 runs $2,200 to $3,500 installed at a competent independent shop, with the median around $2,700. A DIY rebuild in parts alone runs $450 to $1,100 depending on kit tier and whether you replace the hard parts. The rest of this page breaks down where every dollar goes so you can read a shop estimate and know what you are actually paying for.
Installed Rebuild Cost by Shop Type
| Where You Take It | Typical 2026 Price | What You Get |
|---|---|---|
| GM dealership | $3,800 – $5,200 | Reman unit swap, not a true rebuild. Warranty is the draw. |
| Independent trans shop | $2,200 – $3,500 | True teardown, new soft parts, machine work as needed. Best value. |
| General repair shop (sublet) | $2,600 – $3,800 | They pull it, ship it to a builder, mark it up. You pay the middleman. |
| DIY (parts only) | $450 – $1,100 | Your labor, your risk, your warranty. Cheapest by far. |
Labor is the biggest line item at a shop. A 4L80E rebuild is roughly 8 to 12 hours of book time between removal, teardown, reassembly, and reinstall. At $120 to $160 per hour that is $1,000 to $1,900 in labor before a single part goes in the box.
DIY Parts Breakdown — Where the Money Goes
If you are building it yourself, the cost is entirely in the kit you choose and which hard parts you decide to replace. A rebuild kit is not a rebuild by itself. Here is what a real bench build consumes.
| Component | Cost Range | Notes |
|---|---|---|
| Master overhaul kit | $180 – $420 | Frictions, steels, gaskets, seals, bushings, filter. The core of the job. |
| Torque converter | $150 – $400 | Never reuse the old one on a burnt trans. Debris kills the rebuild. |
| Shift kit (TransGo/Sonnax) | $60 – $130 | Firmer, cooler shifts. Cheap insurance for towing. |
| Fluid (12+ quarts) | $60 – $120 | Dexron VI. The 4L80E is thirsty; buy a full case. |
| Hard parts (as needed) | $0 – $500 | Pump, drums, sun shell, planetary if damaged. |
The sun shell is the classic 4L80E weak point. If yours is cracked or the splines are rounded, budget for a hardened replacement. Skipping it to save $80 is how a fresh rebuild loses reverse and 4th six months later.
Compare 4L80E master rebuild kits
Shop 4L80E torque converters
Master Kit vs Stage-2 vs Full Rebuild
Rebuild kit (soft parts only)
Frictions, steels, gaskets, seals, sealing rings. Under $250 usually. This is fine if the hard parts inside your unit are still good. It is a gamble if you have not opened it up yet, because you may find a fried drum you did not budget for.
Stage-2 / heavy-duty kit
Adds high-energy Raybestos or Alto frictions, Kolene steels, and often a Corvette servo or extra clutch in the direct drum. Runs $300 to $450. This is the right kit if you tow, plow, or made any power. It is the sweet spot for most 4L80E owners.
Full rebuild with hard parts
Everything above plus a new pump assembly, hardened sun shell, and reman converter. This is what turns a $500 parts bill into $1,000-plus, but it is what makes the trans outlast the truck. If the unit was slipping badly or overheated, you are in full-rebuild territory whether you like it or not.
4L80E Parts, Shipped Same-Day
Rebuild kits, hardened sun shells, torque converters, and pumps for the 4L80E in stock. Our companion shop gearboxinsider.com ships same-day on orders placed before 2pm Eastern, with free shipping and no discount-code games.
Shop 4L80E Parts →Rebuild vs Replace — When Each Wins
A reman 4L80E from a national supplier runs $1,800 to $2,600 for the bare unit, plus install. Compared to a $2,700 shop rebuild, a reman looks close on price, and it usually comes with a longer warranty. So when does each win?
- Rebuild wins when you have a good local builder, the core is not catastrophically damaged, and you want it built to your use case (towing, performance).
- Reman wins when downtime matters more than a few hundred dollars, or when your builder is booked out three weeks.
- DIY wins when you have the space, the tools, a spring compressor, and the patience to do it right once.
Upsells to Expect on the Estimate
None of these are scams; they are legitimate line items, but you should know what they are before you sign.
- External cooler: $120 to $250 installed. Worth it on any tow rig. The stock in-radiator cooler is marginal.
- Flush of the cooler lines: Non-negotiable on a burnt unit. Debris left in the lines will kill the new converter.
- New flexplate: Only if yours is cracked. Have them show you the crack.
- TCM relearn / calibration: Some builds need it. On a 4L80E it is usually minor.
FAQ
Is the 4L80E worth rebuilding?
Yes. It is one of the most durable automatics GM ever built. A properly rebuilt 4L80E with good frictions and a hardened sun shell will outlast most of the truck it is in.
How long does a 4L80E rebuild take?
A shop turns it in 3 to 5 business days if they are not backed up. A first-time DIY build is a full weekend plus a day, mostly because of the learning curve on the clutch clearances.
Why is my 4L80E rebuild quote so much higher than a 4L60E?
The 4L80E is bigger, heavier, holds more fluid, and its good parts cost more. Expect it to run $400 to $700 more than a comparable 4L60E job.