Will this fit a 86 Chevy C10 with the 8.5 10 bolt rear?

no you will need 30 spline axles those trucks used 28 spline axles

This fit a 94 chevy 1500?

Yes, this unit will work GREAT in a 1994 Chevy 1500. Let me know if you have any other questions. Thanks, BRYDON 641-751-8060 staticz2229@gmail.com

Is this a drop in replacement?

Almost a drop in unit, you will have to move your ring gear from your original unit..and press on new bearings...

Will this fit a 1973 Pontiac Firebird?

First answer is not correct. This is NOT for a 9.5” 14 bolt. The description states it is for a 10 bolt 8.5” or 8.6” with 30 spline axle shafts

Yukon Gear And Axle Dura Grip Limited Slip Differential Positraction

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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¥147471

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚙 Grip the road like a pro with Yukon’s Dura Grip – where power meets precision!

BUILT TO LAST - Forged 4320 chromoly spider gears and nodular case ensure unmatched durability in any terrain.
PROUDLY USA ASSEMBLED - Crafted with meticulous quality control and backed by a one-year warranty for peace of mind.
REBUILDABLE UPGRADEABLE - Designed for easy repairs and upgrades, extending your differential’s lifespan and performance.
PRECISION TRACTION CONTROL - Composite clutches deliver smooth yet aggressive torque distribution for superior handling.
PERFECT DANA 44 COMPATIBILITY - Engineered specifically for Dana 44 axles with 30 splines and 3.73 & down gear ratios for a flawless fit.

The Yukon Gear & Axle Dura Grip Limited Slip Differential (YDGD44-3-30-1) is a high-performance, rebuildable positraction unit designed for Dana 44 axles with 30 splines and 3.73 & down gear ratios. Featuring forged 4320 chromoly spider gears and composite clutches, it delivers aggressive yet smooth traction, enhancing vehicle stability and torque distribution. Proudly assembled in the USA, this differential offers durability, reliability, and a perfect fit for off-road and high-demand driving conditions, backed by a one-year warranty.

Specifications

ASIN	B00AWE6396
Best Sellers Rank	#38,074 in Automotive ( See Top 100 in Automotive ) #13 in Automotive Replacement Differential Assembly Kits
Brand	Yukon Gear & Axle
Customer Reviews	4.7 4.7 out of 5 stars (1,666)
Date First Available	January 3, 2013
Exterior	Machined
Item Weight	10 pounds
Item model number	YDGD44-3-30-1
Manufacturer	Yukon Gear & Axle
Manufacturer Part Number	YDGD44-3-30-1
Model	DuraGrip Limited Slip Differential Positraction Dana 44 w/30 Spline 3.73- Ratio
OEM Part Number	YDGD443301

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