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

751478CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Grip the road like a pro — never lose traction, never lose control!

UNMATCHED DURABILITY - Forged 4320 steel internals engineered for long-lasting strength and reliability.
CUSTOMIZABLE PERFORMANCE - Fully rebuildable design lets you fine-tune your limited slip differential for peak traction.
PROUDLY ASSEMBLED IN THE USA - Crafted with American quality standards to ensure top-tier performance and durability.
SMOOTH YET AGGRESSIVE TRACTION - 4-spring clutch style positraction delivers confident grip on and off-road without sacrificing ride quality.
PRECISION FIT FOR GM 8 5 8 6 DIFFS - Compatible with multiple GM differential models and spline counts for seamless installation.

The Yukon Dura Grip Limited Slip Differential is a high-performance, fully rebuildable positraction unit made with forged 4320 steel internals. Designed for GM 8.5" and 8.6" differentials with 30 spline and 2.73+ gear ratios, it delivers aggressive traction while maintaining a smooth ride. Assembled in the USA, this clutch-style limited slip is perfect for both on-road and off-road enthusiasts seeking reliable grip and durability.

Specifications

ASIN	B003O755NS
Best Sellers Rank	#40,058 in Automotive ( See Top 100 in Automotive ) #2 in Automotive Performance Drive Train #436 in Automotive Replacement Drive Train Parts
Brand Name	Yukon Gear & Axle
Customer Reviews	4.7 out of 5 stars 1,674 Reviews
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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751478CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

View all Trustpilot reviews