Will this fit a 68 - 72 GM A body?

This is for the HD Trucks. 2500, and 3500 respectfully. I would cross reference part numbers.

Will this fit a 2005 chevy tahoe z71?

No. For your application search 178-1030

Does this part come with master cylinder pushrod?

I suppose you mean the pushrod that connects to the brake pedal under the dash? Yes. The MC itself bolts directly to the nose of the unit. No rods necessary. It doesn’t include the gasket which seals the MC housing to the unit however. I would always recommend replacing that.

Does it have gas inside or spring?

The hydro- boost unit does have a inner spring but uses power steering fluid also to operate. That's why there are power steering fluid lines on the unit.

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ACDelco GM Genuine Parts 178-1036 Power Brake Booster Assembly

ACDelco GM Genuine Parts 178-1036 Power Brake Booster Assembly

Product ID: 140949708

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Details

Brand
GM Parts
Vehicle Service Type
ATV
Orientation
Forward facing
Global Trade Identification Number
Assembly Required
No

⚙️OE-certified precision engineering

🛠️Pre-adjusted master cylinder rods for effortless install

🛡️Rust-resistant finish for extended durability

Description

🚗 Boost your brake game with GM precision power!

BUILT TO LAST - Exclusive rust-prohibitive finish keeps your brake booster looking and working like new.
TRUE OEM QUALITY - Genuine GM parts engineered to the exact specs of your vehicle for seamless compatibility.
TESTED FOR RELIABILITY - Every unit undergoes rigorous testing to ensure flawless operation under pressure.
PLUG AND PLAY INSTALLATION - Pre-adjusted rods mean zero guesswork—get back on the road faster.
RESTORES PEAK BRAKING POWER - Feel the confidence of GM-backed performance every time you hit the pedal.

The ACDelco GM Genuine Parts 178-1036 Power Brake Booster Assembly is a forward-facing, OE-certified brake booster designed for ATV applications. Weighing 13.96 pounds and measuring 20.62 x 12.62 x 10.25 inches, it features pre-adjusted master cylinder rods for quick installation, a rust-resistant machined exterior, and is rigorously tested to meet GM’s high standards for reliable braking performance.

Specifications

Brand	GM Parts
Vehicle Service Type	ATV
Orientation	Forward facing
Global Trade Identification Number	00808709855255
Assembly Required	No
OEM Part Number	19371361
Manufacturer	ACDelco
UPC	808709855255
Model	ACDelco
Item Weight	13.96 pounds
Product Dimensions	20.62 x 12.62 x 10.25 inches
Item model number	178-1036
Exterior	Machined
Manufacturer Part Number	178-1036