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GM 4L80E, 4L85E Late Model & Hummer, Deep Transmission Pan

Part Number 9437

PML GM 4L80E late tranny pan, as-cast
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PML GM 4L80E late tranny pan, powder coated
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As-cast finish
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Black powder coating
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Volume: 3.25 qts. over stock

Dimensions: Click here for dimensions.

Number of Bolts: 17

This PML pan fits GM and Chevrolet 1997 to 2007 trucks, SUVs, and vans with the 4L80E and 4L85E transmission. Some examples of typical vehicles that this pan can fit are:

  • Avalanche 2500, 2002 to 2006 8.1 V8, see installation note at bottom
  • Hummer H1, 1997 to 2005 with 5.7, 6.5 diesel engines
  • C2500, K2500 1997 to 1999 with 454, 6.5 diesel engines
  • C3500, K3500 1997 to 1999 with 454, 6.5 diesel engines
  • Express, Savana, 1997 to 2009, 6.0, 6.5 & Duramax diesel engines, some 4.8
  • Sierra, Silverado 2500/3500, 1999 and 2000
  • Sierra, Silverado 2500/3500, HD or Classic, 2001 to 2007, 6.0 V8
  • Sierra, Silverado 1500HD, 2001 to 2007, 6.0 V8
  • Suburban 2500, 1997 to 2006 8.1 V8, see Avalanche installation note at bottom

Vehicle configurations vary so always check your configuration and clearance before ordering. Some models may require modification of the heat shield.

Earlier model year vehicles will need a pan without a slant to avoid interference with transmission internals. See this extra capacity PML pan for GM 4L80E/4L85E transmissions on early model trucks.

The pan has a boss that can be machined for a temperature sensor.

For Hummer H1: please read these additional instruction tips: PML Part Number 9437 on a Hummer H1 Installation.

Installation Notes:

  • Because of the frame cross member, many vehicles will need to loosen the transmission mounts and jack up the transmission to remove the stock pan and install the PML pan.
  • Some vehicles may need to modify or remove the heat shield.
  • Depending on clearance available on the vehicle, accessing the mounting bolts maybe difficult. PML provides allen head bolts and PML pan walls are thicker and closer to the bolt holes than the stock pan.

GM 4L80 filters


Both GM early model and late model 4L80 filters should work with this transmission pan. This PML pan has filter supports to hold the filter in place. A filter extension is not needed.

The installer must verify fitment and installation.

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Cable Bracket on Stock Pan

Some stock pans have a bracket for the shift cable assembly attached to the flange.

Our customer Darrell provided these Guidelines for Modifying the Bracket to work with the PML pan.

Image PML pan installed with bracket modified to fit.

PML Transmission Pan Compared to Stock

PML Transmission Pan Part Number 9437 height compared to stock  PML Transmission Pan Part Numbers 9437, compared to stock
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These images show this PML transmission pan compared to the stock pan.


Hummer H1 PML Transmission Pan Install

Hummer H1 with a PML transmission pan

PML GM 4L80 transmission pan installed on a 1997 TD H1 Hummer.

If you have a Hummer, please visit our Hummer page.

Silverado 1500HD PML Transmission Pan Install

This installation is on a 2006 Chevy Silverado 1500HD. The images below show the stock pan and the PML pan. To install the PML pan, the heat shield was removed. During the installation, the transmission mounts were loosened to allow easier access. The pan has the as-cast finish.

Silverado stock transmission pan     PML GM 4L80E transmission pan on a Silverado 1500

Avalanche 2500 PML Transmission Pan Install

PML's transmission pan was installed on a 2005 Avalanche 2500 with the 8.1 engine and 4L85E transmission. This Avalanche is used as a plow truck and general workhorse.

These images show the stock pan, the shift linkage, and the Felpro gasket (part number TOS 18698) our customer used with the PML pan:

avalanche stock transmission pan   avalanche shift linkage near transmission pan   PML pan and Felpro gasket for avalanche

The images below show the PML transmission pan installed. The image on the right shows the heat shield next to the PML pan. In the center image, you can see that the shift linkage is really close to the pan. He filed off about 1/16" and then bent it out a bit to keep it away from the pan. The image on the right shows the pan installed. The cross member did not interfere with the pan. The customer removed the cross member to replace his transfer case.

PML pan on avalanche near heat shield.   avalanche shift linkage near PML transmission pan   PML pan installed on a avalanche

Here are the installation notes from the Avalanche owner:

It's a tight fit but fits fine. I didn't remove the heat shield (no need). The shield on this vehicle is on the right side and is also part of the exhaust hanger. You can't remove the entire thing (as it is the hanger) but you can cut the spot welds to remove the shield but there was no point as it isn't hitting (slightly bent the shield by hand to make sure I had plenty of clearance).

I found the left side of the pan needed to go up first then the right BUT the right needed to be snugged up to the gasket surface first otherwise it is difficult. The pan fits but I needed to figure out just how to sneak it into place. It's a tight fit but it does fit fine.

The only spot that hit the pan was the bracket for the shift linkage. I filed it a bit (maybe 1/16" or less) and once I remove the front drive shaft tomorrow I'll bend it out a bit to keep it away from the pan.

I also held up the cross member after the install and no clearance issues there either. The 2500 Avalanche should be exactly the same as the 2500 Suburban.

After driving 600 miles with the PML pan installed, this customer emailed us again to say "Works great, no rubbing of any kind or no noises." He used Amsoil synthetic transmission fluid. Temperature of the fluid does not go over 200 even when plowing heavy snow for long periods.

PML Transmission Pan Features

  • Increased oil capacity for cooler temperatures
  • Sand-cast aluminum with raised fins
  • 3/16-inch thick wall construction to add strength to the transmission case
  • 3/8-inch thick gasket flange will not bend when bolts are tightened
  • Machined gasket surface for a secure seal
  • Boss cast into pan can be machined for a temperature sensor
  • Drain hole and magnetic drain plug for easier, less messy maintenance

All PML transmission pans ship with new mounting bolts and a magnetic drain plug.

If you would like PML to machine your pan for a temperature sending unit, there is an additional charge of $45 .

Find out why you should buy a PML transmission pan.

Learn more about finishes and construction of PML parts.

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