Quality OEM Parts - Fast Shipping - Wholesale Pricing
Free Shipping
On orders over $70
Same-Day Ship
On in-stock parts
Verified Fitment
Year, Make, Model
OEM Quality
AC Delco, Sonnax, Transtar
Why Core Transmission

Built by Transmission Pros, for Transmission Pros

01
OEM & Premium Brands Only

AC Delco, Sonnax, Transtar, Raybestos, Alto, Borg-Warner, TransGo. No no-name junk. No counterfeit risk. Every part traceable to its manufacturer.

02
Fitment You Can Trust

Every listing tagged by transmission family AND year range. No "will this fit my 2004?" confusion — your year is in the title. If it doesn't fit, ship it back free.

03
Same-Day Shipping

Order by 2pm ET on a weekday and your in-stock parts ship the same day. Free shipping over $70. Tracking emailed automatically.

Not Sure What You Need?

Tell us your transmission, we'll point you at the right part. Free.

20+ years rebuilding 4L60E, 4L80E, 6L80, and 68RFE units. We know what fails and what fixes it.

FAQ

Common Questions

What transmission part fits my 4L60E?

Every product page on CoreTransmissionParts.com shows verified year range and OEM part numbers. Filter by 4L60E (1993-2008) in the sidebar or search by your OEM number to find the exact part.

Do you carry OEM AC Delco solenoids and shift kits?

Yes. We stock genuine AC Delco shift solenoids, EPC pressure control solenoids, TCC solenoids, and complete solenoid kits for 4L60E, 4L65E, 4L80E, 6L80, and 6L90 transmissions.

How fast do orders ship?

Same-day shipping on in-stock orders placed before 2pm ET on weekdays. Free shipping over $70. Tracking is emailed automatically.

Do you sell Sonnax HD performance parts?

Yes — we carry the full Sonnax HD lineup including SmartShell, Heavy Duty Sun Shells, Boost Valve Kits, Pressure Regulator Valve Kits, Pressure Booster Kits, and torque converter rebuild components for 4L60E, 4L80E, 6L80, 700R4, 48RE, 68RFE, and Allison families.

What's your fitment guarantee?

Every part is tagged with its transmission family and exact year range in the title. If the part you ordered doesn't fit your application, ship it back free within 30 days.

Do you carry Allison 1000 rebuild kits?

Yes — Allison 1000 master rebuild kits, friction packs, steel kits, valve bodies, solenoids, filters, and Goerend, SunCoast Diesel, BD Diesel performance components for 2001-2024 Duramax Allison 1000.

Can I get tech help picking the right part?

Absolutely. Use the Ask a Tech button on any page or email us your transmission family + year + VIN and we'll point you at the right part. 20+ years rebuilding 4L60E, 4L80E, 6L80, and 68RFE units.

Do you sell Transtar parts?

Yes — Transtar overhaul kits, Banner kits, master rebuild kits, friction packs, and individual hard parts for nearly every domestic transmission family.

What brands do you carry?

AC Delco, Sonnax, Transtar, Raybestos, Alto, TransGo, Borg-Warner, TransTec, Motorcraft, Dorman, SunCoast Diesel, BD Diesel, Allison, Mopar, JEGS, Hughes Performance, Goerend Transmission, and many more.

Do you offer wholesale pricing for shops?

Yes — registered shops get wholesale pricing on bulk orders. Email us with your shop name, location, and tax ID for an account.

Quality Parts From Brands Pros Trust
AC Delco·Sonnax·Transtar·Raybestos·Alto·TransGo·Borg-Warner