It is really all about reversing with a manual transmission, especially with a trailer.
The 2WD low switch is a wiring harness that plugs inline with the ECU and tricks it allowing you to place the truck into low gear (transfer case) WITHOUT engaging the front axle and 4WD.
The manual transmissions reverse is geared very high! This makes backing up a hill, or with a trailer a pain. One way around is to drop it into the low range on the transfer case, which then also engages 4WD.
Of course 4WD makes steering difficult going slow in reverse.
If you have driven the manual and spend time backing trailers, you will have felt this frustration.
My understanding is someone on the Tacoma World forum came up with it, but is no longer making them. I did find another source, “Aliexpress” but it’s a Chinese knock off and I’m just not so sure about that?
I did also find a wiring schematic, but electrical has never been a strong suit and I’m not too keen on cutting and splicing my factory harness. The one that I can’t find available any longer was a “plug and play” harness.
Still looking. Will update.
Concerning the Clutch Accumulator delete, I found one I liked and hopefully will get it installed in the next few days. Will update on that project as well.
Will be busy in the shop the next few days…
New tires, 60K service, OTT tune going in, and the Clutch Accumulator Delete.