What kind of nsbu switch do I Need?

There are 2 switches that I’m aware of. – 2001-2004 Allison NSBU Switch (LB7). Part no. 29540479. Has 2 electrical connectors on the switch. – 2004 – 2005 Allison NSBU Switch (LLY).

How do you replace the nsbu in a diesel?

With a wrench keeping the shifter from rotating (out of neutral…you did put the transmission in neutral right?), remove the nut from the end of the selector shaft. Carefully remove the selector lever from the selector shaft.

Where is the nsbu switch located on an Allison Transmission?

Where is the NSBU switch located? – driver’s side of the Allison transmission…see pics below for details. Why does the NSBU need to be replaced? – due to road salt/water/debris getting into the switch via the switch hub and contaminates and corrodes the internals.

What makes the nsbu stay in the neutral position?

The new switch also has a thin metal clip called a Neutral Assurance Bracket to ensure that the NSBU remains in the neutral position. DO NOT REMOVE UNTIL THE NEW SWITCH HAS BEEN INSTALLED.

How does the nsbu switch affect the transmission?

The crap gets kicked up onto the switch on all left hand turns which affects the operation of the transmission because transmission shifts and functions are controlled by this switch. What are some of the symptoms that the NSBU switch is going bad?

What are the DIC codes for the nsbu switch?

– following DIC codes MAY suggest the NSBU as the culprit: P0700, P0708, P0847, P0872, P0875, P1711 and P1713. – no engagement even though your shifter is in D or R (like you were in neutral)…this was my situation (and I received a SEL (service engine light) code P0700). – you will only have forward motion in 3rd gear or reverse.

How to replace the nsbu in a LLY?

The new switch also has a thin metal clip called a Neutral Assurance Bracket to ensure that the NSBU remains in the neutral position. DO NOT REMOVE UNTIL THE NEW SWITCH HAS BEEN INSTALLED. 2. put the transmission in neutral. 3. disconnect NSBU wiring harness (2 in my case – I have a 2003 LB7…LLY only has 1 electrical connection).