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

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Yukon Dura Grip Limited Slip for GM 8.5" & 8.6" Diff, 2.73 & Up Ratio, 30 Spline

Product ID: 20830785

Details

Brand
Yukon Gear &
Color
Silver
Global Trade Identification Number
Material
Alloy Steel
UPC
883584260165

🔧Fully Rebuildable Design

🚙4-Spring Clutch Style Positraction

🛠️Forged 4320 Steel Internals

€ 904.86

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Grip the road like a pro with Yukon Dura Grip – where power meets precision!

PRECISION FIT FOR GM - Compatible with GM 8.5" & 8.6" differentials, 2.73+ gear ratios, and 30 spline axles.
UNMATCHED DURABILITY - Built with premium forged 4320 steel for long-lasting strength and reliability.
SUPERIOR TRACTION CONTROL - 4-spring clutch style positraction delivers aggressive grip on any terrain.
CUSTOMIZABLE SERVICEABLE - Fully rebuildable design lets you maintain peak performance over time.
PROUDLY ASSEMBLED IN THE USA - Crafted with care and quality assurance to keep you confidently on the road.

The Yukon Dura Grip Limited Slip Differential is engineered with forged 4320 steel internals and a 4-spring clutch style positraction system, providing aggressive traction and smooth ride quality. Fully rebuildable and compatible with GM 8.5" and 8.6" differentials featuring 30 spline axles and gear ratios of 2.73 and up, this USA-assembled unit ensures durability and performance for both on- and off-road driving.

Specifications

ASIN	B003O755NS
Best Sellers Rank	#34,372 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Performance Drive Train #326 in Automotive Replacement Drive Train Parts
Brand Name	Yukon Gear & Axle
Customer Reviews	4.7 4.7 out of 5 stars (1,657)
Global Trade Identification Number	00883584260165
Included Components	DuraGrip Limited Slip Differential Positraction GM 8.5" w/30 Spline
Item Type Name	Dura Grip Limited Slip Positraction Unit
Item Weight	0.27 g
Manufacturer	Yukon Gear and Axle
Material Type	Steel
Model	YDGGM8.5-3-30-1
Number of Items	1
Part Number	YDGGM8.5-3-30-1
UPC	883584260165
Unit Count	1 Count
Warranty Description	1 year warranty against Manufacturer defects

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