Does any one have an the BD exhaust brake on their truck?
https://www.shopatron.com/product/part_number=1037115/532.0.20133.20100.0.0.0
I hope this is a site vendor. Sorry if not.

150hp of engine braking power? That might just be the fastest way to cook a 4L80e.

something a little less expensive:
Manual operation of the torque converter lock-up clutch in 1992-1995 trucks with the 4L80E

will get braking from trans, cost is free or as little as 10.00, do it yourself. taken from here:http://blog.heathdiesel.com/2005/11/manual-operation-of-torque-converter.html

In our opinion, the factory transmission programming is quite well sorted out and works very well in the majority of applications. This factory programming affords torque converter lock-up clutch function only in 3rd and 4th gears. When towing uphill, with vehicle speeds that are below the converter unlock point, a significant amount of torque converter-induced transmission heat will build. Being able to hold the converter clutch in lock-up mode will prevent this unwanted heat build-up.
An annoying characteristic of the program is that it 'unlocks' the lock up clutch as soon as the throttle is released. The engine returns to a near idle speed and the truck just coasts down, without the benefit of being slowed by the engine.
A simple two-position toggle switch (Part #HDP1053) (http://www.heathdiesel.com/P/HDP1053/) can be installed on the dash panel to provide a full, manual control of the lock up clutch. This will allow the manual locking of the torque converter in 2nd, 3rd and 4th gears and this is beneficial when towing.
Under towing conditions when vehicle speed must be low due to traffic and or road conditions, the converter can now be held in the lock-up mode while the trans is held in 2nd or 3rd gear.
To accomplish this modification, you will need a two-position, three pole toggle switch. The one we use us a Cole-Hersee #5584.
You must locate the 'BROWN' wire coming out of the electrical connector at the transmission. This wire runs to the ECM and controls the lock-up function in the transmission.
You will interrupt this brown wire at some point conveniently away from the electrical connection on the transmission. Splice a wire to both the transmission-end of this brown wire as well as the ECM-end of it. These two spliced-on wires will run to the new dash mounted switch. We usually mount the toggle switch in one of the ‘block-off’ plates on the dash, however it can be mounted virtually anywhere you like.
The switch has three connector terminals. Connect the ECM-side wire to one of the end terminals on the switch. Connect the transmission-side wire to the center terminal on the switch. Connect the remaining terminal to a good ground.
In one position, the switch connects the ECM to the transmission to achieve factory control of the converter lock-up clutch. In the other position, the switch grounds the wire running to the transmission to force a lock-up of the clutch.

Deejaaa, doesn't that only work on OBDI trucks?

Deejaaa, doesn't that only work on OBDI trucks?

exactly. that doesn't work on OBDII trucks.

exactly. that doesn't work on OBDII trucks.
I still need to do that mod yet... But I'm def not using that $140 switch from heath lol.

So how do we fix this on newer trannys? Like mine 1998, for example....

so far i have found this but no solution yet:
http://www.powertraincontrolsolutions.com/download/tcu/harness/4L60_65_70_80_85%201993%20and%20up.pdf
http://www.powertraincontrolsolutions.com/downloads.php
http://www.bmracing.com/PRODUCTS/Transmission-Accessories-and-Kits/Converter-Lockup-Control-for-GM-automatic-trans-w-lockup-converter-mechanical-speedometer
http://www.bmracing.com/PRODUCTS/Transmission-Accessories-and-Kits/Converter-Lockup-Control-for-GM-automatic-trans-w-lockup-converter-electronic-speedometer
couldn't find any real good solutions for the OBD2 trans. b&m is kind of pricey and not sure if it's even for the 4l80. maybe the schematic will be a clue for someone who knows how to read them.