Bought this and it came with no instructions. What gear does the trans need to be in so it is clocked correctly while I install it?

Any gear will work, then just put your bolts back in

Is this the correct part for an Allison 1000 trans in a 2005 Kodiak C4500?

No this is different, it is for 4L80E transmissions

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General Motors GM Genuine Parts D2257C Park/Neutral Position and Back-Up Lamp Switch

Product ID: 391462551

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Details

Operation mode
automatic
Current rating
20 Amps
Operating voltage
5 Volts
Contact type
Normally Open
Connector type
Clamp

🔋Optimizes vehicle electronics

🚗Enables safe start & backup lights

⚙️Precision GM OE fit

Description

🚦 Drive with confidence—GM precision that never quits!

DURABILITY YOU CAN TRUST - Built with premium materials to match GM’s original factory quality and longevity.
PLUG AND PLAY INSTALLATION - Direct replacement part designed for hassle-free, professional-grade installation.
DUAL FUNCTION SAFETY SWITCH - Ensures your vehicle starts only in park or neutral while activating backup lamps automatically.
ENHANCE VEHICLE RELIABILITY - Optimizes electronic controls to maintain peak vehicle performance and safety.
SEAMLESS GM OE COMPATIBILITY - Engineered to exact GM specifications for flawless fit and function.

The GM Genuine Parts D2257C Park/Neutral Position and Back-Up Lamp Switch is a GM-recommended, factory-spec replacement part that ensures your vehicle starts safely only in park or neutral and automatically activates backup lamps. Manufactured by ACDelco to meet GM OE standards, it guarantees reliable performance, durability, and seamless integration with your GM vehicle’s electronics.

Specifications

Manufacturer	ACDelco
Brand	GM GENUINE PARTS
Model	Neutral Safety Switch
Product Dimensions	27.94 x 12.19 x 11.94 cm; 303.91 g
Item model number	D2257C
Exterior	Painted
Manufacturer Part Number	24221125
OEM Part Number	24221125
Lift Type	automatic
Item Weight	304 g

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₩165551

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TrustScore 4.5 | 7,300+ reviews