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Allison Problems no 4th-5th anyone?

Hotair

By Hotair
in 2000-2014 Silverado HD & Sierra HD

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Hotair Enthusiast

Hotair

Posted
Posted

Driving my truck to work the other day and the Door Locks unlocked while doin 40 mph. then i noticed my indicator for my gear selection was not working. Now i only have 1st - 3rd and reverse. Anyone ever have this problem before? Goin to the dealer on Monday, they think is some sort of control box.... any ideas? :confused:

 

 

Bob

kylant Enthusiast

kylant

Posted
Posted

NSBU switch!

 

Neutral saftey backup switch. very common problem. go over to thedieselpage.com and check out all the threads on this.

 

good luck :confused:

Hotair Enthusiast

Hotair

Posted
  • Author
Posted

Thanks Kylant. the diesel page was very informative. now i have an idea what to expect. hopefully they have the part instock! Thanks again!

BlackSilver Senior Enthusiast

BlackSilver

Posted
Posted
count how many times the tranny shifts from a complete stop.

That may not work! Unless it's very cold out, or you're pulling and in "Tow/Haul", I think the truck starts out in 2nd gear.

kylant Enthusiast

kylant

Posted
Posted

hotair,

 

no problem. make sure you get the TAN switch. this is the updated one. they may need to clear your TCM for any trouble codes

 

good luck

 

:confused:

Roofer Senior Enthusiast

Roofer

Posted
Posted
count how many times the tranny shifts from a complete stop.

That may not work! Unless it's very cold out, or you're pulling and in "Tow/Haul", I think the truck starts out in 2nd gear.

I think you're right on the cold part. If the tranny is still under 100, 1st and 5th don't engage.

tbyrne Senior Enthusiast

tbyrne

Posted
Posted

I noticed the other day that mine felt like it was "catching up" when I came to a stop. Got down to about 5 MPH and felt it bang into 1st. Actually I thought I could feel it hit 2nd and then bang 1st within about 2 seconds. I haven't driven the truck much since then to pay attention to this.

 

Tom

 

02silveradonew2small.jpg02suburban22sm.jpg

 

2002 8.1 Silverado HD - Comp Cam, TOGs headers, Volant induction, Direct Hits ignition, 8" lift 18" wheels/tires + more

2002 8.1 Suburban -Intercooled Whipple supercharger, TOGs headers, Volant induction, 22" wheels/tires + more - 407hp/558 ft-lb torque at the rear wheels.

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