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It turns on the low/rev clutch in D3 position first gear. Can also be set up to do so in OD position but not advised except in plow vehicles as downshifts coming to a stop can be rather brutal.
But in very extreme power levels D3 racing and in plow vehicle's here constant R TO D TO R TO D happens it can help protect the low roller, I have only used it 2x in performance one was a 1200 rwho vet that kept exploding the low roller on launch and it did fix it . And one a few plow trucks as they are also well known to kill the low roller with the constant fwd/rev shifts usually without coming to complete stop. I have not posted method as it is really something anyone should do except in these type extreme situations as I said the downshift coming to a stop from coast is pretty brutal when accompanied with the ft overrun mod which logically would be used with it .
Note when using 4th servos and in particular the sonnax dual 4th that sticks out with rubber seals , It is important to reinstall the heat shield. With the exhaust and cats so close and the servo being a dead end flow wise, Once applied they fluid just sits there till released. temps can go extremely high and this can and will result in a break down of the seals sometimes in short order.
I saw a post recently a guy posted fussing cause he had a slipping 4th on facebook and when he removed the servo the seals have more or less disintegrated. He was not running a heat sheild and was fussing how hard to was to get out he had to remove the exhaust.
The servo is a dead end though I have considered adding an orifice to perhaps make a quicker apply and aid in cooling . So next to exhaust with no shield it will get very very hot in there and cause the seals to break down.
SO I do strongly advise the heat shield be reinstalled. Also failure to do so can result in damage and leaking at the electrical plug https://scontent-bos5-1.xx.fbcdn.net...Nw&oe=66D42C37
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