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⚙️ Upgrade your GM 8.5" differential with confidence—master the road like a pro!
The ZK GM8.5 Master Overhaul Kit by USA Standard Gear is a comprehensive, vehicle-specific differential rebuild kit featuring high-quality Koyo bearings, races, seals, and all necessary hardware. Designed for GM 8.5" differentials, it ensures a precise fit and professional-grade installation, backed by trusted USA manufacturing and extensive research for optimal performance and durability.
| ASIN | B003O07BZ0 |
| Best Sellers Rank | #9,360 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Differential Assembly Kits |
| Brand | USA Standard Gear |
| Customer Reviews | 4.4 4.4 out of 5 stars (2,732) |
| Date First Available | February 13, 2012 |
| Exterior | Machined |
| Is Discontinued By Manufacturer | Yes |
| Item Weight | 6 pounds |
| Item model number | ZK GM8.5 |
| Manufacturer | USA Standard Gear |
| Manufacturer Part Number | ZK GM8.5 |
| Model | ZKGM8.5 Rear Master Overhaul Kit for GM 8.5" Differential |
| OEM Part Number | ZKGM8.5 |
M**B
Great value on quality parts
Not sure why this kit is so inexpensive. It uses quality Koyo bearings made in Japan and the US. The only reason I can see for its low price is the kit was not packed in its original box. However, the seller included the original box end flap showing the USA Standard Gear P/N and description. Score! Just noticed the "YK" kit costs nearly 4 times as much as this "ZK" kit, probably because it uses Timken bearings. Makes no sense to me because Timkens can be made outside of the US, and I don't see how they can be significantly better than a US- or Japanese-made KOYO. And I've read where KOYOs are used in all kinds of Japanese car and truck applications. Maybe someone can enlighten me.
R**Y
Works great!
These guys are great, superior customer service and quality parts. Thanks so much. This kit works great in a factory GM 8.5" rear for 1998 Tahoe with the GU6/G80 carrier. I had to make some changes and the seller accommodated my needs and helped me out with everything else. Thanks Brydon!
J**R
fits perfect
Wonderful and worked great on my Tahoe rebuild
S**T
Great Product!
Bought one from Napa and took ir back. This one was half the price and it came with an instruction guide with all the spec's!!
P**R
good kit. koyo bearings.
Great and complete kit. However, bearings did not fit my trutrac diff. ordered the correct bearings and all good to go.
L**S
exactly as advertised!!!
Great value! got here early!!
A**R
Makes the job easy!!
Excellent kit that had everything you need to install your differential ring and pinion set.
R**T
Overhaul kit
Everything came in the box..very pleased with the product
R**.
buen producto
todo se ve de buena calidad y completo falta realizar la instalación y comprobar su durabilidad
B**D
Good customer service
Good kit but if your buying Yukon unit YDGGM8.5-3-30-1 don’t buy this kit the carrier bearings don’t fit you’ll need to get LM102949 and LM102911 bearings and races called amazon and they did refund me some money
D**R
good product
everything i needed when i gear swapped a 1978 firebird .
J**Y
Great rebuild kit
Great kit worth the money, if you need axle seals and bearings they do not come with this kit. For stock carrier
J**.
Incompatible con chevrolet s10 1995 2.2lts
Ustedes afirmaron le queda a mi vehículo y NO le queda. El producto está nuevo sin desempacar e intenté hacer devolucion pero en paquetería me piden factura para permitir devolucion. Y en Amazon no dan factura porque está en proceso de devolucion. O sea... no es posible la devoluciones pues. Tengan mucho cuidado con Amazon
Trustpilot
2 months ago
2 days ago