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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Description

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

WIDE COMPATIBILITY - Fits GM 8.5"/8.6" differentials with 30 spline axles and gear ratios 2.73 and up—versatility for countless GM models.
UNMATCHED DURABILITY - Built with premium forged 4320 steel internals for long-lasting strength and reliability.
PROUDLY MADE IN THE USA - Crafted and assembled domestically, guaranteeing quality and supporting American manufacturing.
REBUILDABLE SERVICEABLE - Fully rebuildable design means you can maintain peak performance without costly replacements.
PRECISION TRACTION CONTROL - 4-spring clutch-style positraction ensures aggressive grip and smooth power delivery on any terrain.

The Yukon Gear Dura Grip Limited Slip Positraction unit is a high-performance differential upgrade designed for GM 8.5" and 8.6" differentials with 30 spline axles and gear ratios 2.73 and up. Featuring forged 4320 steel internals and a 4-spring clutch-style limited slip mechanism, it delivers aggressive traction and smooth handling for both on- and off-road driving. Fully rebuildable and assembled in the USA, this unit fits a wide range of GM vehicles, making it the go-to upgrade for millennial professionals seeking reliable, durable, and precision-engineered drivetrain performance.

Specifications

Manufacturer	Yukon Gear & Axle
Model	DuraGrip Limited Slip Differential Positraction GM 8.5" w/30 Spline
Item model number	YDGGM8.5-3-30-1
Exterior	Machined
Manufacturer Part Number	YDGGM8.5-3-30-1
OEM Part Number	YDGGM9.5331
Special Features	DIFFERENTIAL OIL: Use non-synthetic GL-5 gear oil and Yukon LSD (Limited Slip Differential) additive (ASIN B00J0G09JW, model OILADD) are recommended for durable performance and smooth operation. Synthetic oil is not recommended and can result in aggressive or noisy operation. This unit requires the use of carrier bearing & race part numbers LM102949 & LM102911 for the 8.5 in. housing (2.891 in. Race OD) or LM603049 & LM603012 for the GM 8.600 in. housing (3.062 in. Race OD)., The GM 8.5" & 8.6" came in the following vehicles \| GTO '70-'74 \| Hummer H3 '06-'10 \| Impala '71-'85 '94-'96 \| Isuzu Ascender '03-'08 \| Malibu '73-'83 \| Nova '70-'79 \| Oldsmobile Cutlass '70-'77 '85-'87 \| Omega '73-'79Pontiac Bonneville '70-'86 \| Rainier '04-'07 \| Regal '73-'87 \| Replacement Part Number: '559-010 \| Riviera '75-'78 \| S-10 Blazer '94 \| S-10 Pickup '99-'04 \| Saab 9-7X '05-'09 \| Savana '96-'13 \| Sierra 1500 '99-'17 \| Sierra 2500 '11-'13 \| Sierra 3500 '11-'13 \| Silverado 1500 '99-'17, The GM 8.5" and 8.6" came in the following vehicles \| Bel Air '70-'75 \| Blazer '77-'94 \| Buick Apollo '73-'75 \| Cadillac Escalade '99-'00 '02-'13 \| Camaro '70-'81 \| Canyon '04-'12 \| Caprice '70-'96 \| Catalina '70-'81 \| Chevelle '73 \| Chevy Avalanche '02-'06 '09-'13 \| Chevy Monte Carlo '73-'78 \| CK Pickup '77-'86 '88-'00 \| Colorado '04-'13 \| El Camino '71-'76 \| Electra '71-'89 \| Envoy '02-'09 \| Express '96-'14 \| Firebird '70-'81 \| GMC CK Pickup '77-'86 '88-'00 \| Grand Prix '71-'87, The GM 8.5" and 8.6" came in the following vehicles \| G-Series '75-'95 \| G-Series '78-'95 \| Skylark '70-'72 '75-'79 \| Sonoma '94-'04 \| SSR '03-'06 \| Suburban '77-'86 '92-'99 \| Suburban '77-'99 \| Tahoe '95-'17 \| Trailblazer '02-'09 \| Typhoon '92-'93 \| Ventura '76-'77 \| Yukon '00-'13 \| Yukon Denali '01-'13, The Yukon DuraGrip Positraction (also known as a "posi") is a Limited slip differential (LSD), is a traction device that splits torque to both axles, enabling continuous traction around corners as well as a strait line. This Posi fits a GM 10 Bolt 8.5" & 8.6" Inches with 30 Spline Axles. Aftermarket Carrier Style: Clutch-type. Fits 2.73 Gear Ratio & Up.
Item Weight	10.1 Kilograms

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