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GM OEM TH400 / 4L80E / 4L85E HEAVY-DUTY DIRECT DRUM ASSEMBLY
Complete heavy-duty GM transmission direct clutch drum assembly equipped with a 34-element sprag for select TH400, 4L80E and 4L85E automatic transmission applications.
This is a LOADED / PACKED assembly with the clutch and steel components shown in the listing photos—not a bare drum.
Ideal for heavy-duty towing, performance and transmission rebuild applications where the stronger 34-element sprag configuration is desired.
WHAT YOU RECEIVE:
OEM GM direct clutch drum
34-element sprag assembly
Clutch frictions shown
Steel plates shown
Related internal components shown
Complete loaded assembly exactly as pictured
HEAVY-DUTY 34-ELEMENT SPRAG:
The 34-element intermediate sprag configuration is commonly used in upgraded TH400, 4L80E and 4L85E transmission builds.
Compared with basic roller-style configurations, this design is widely used in heavy-duty and performance applications where greater holding capacity and durability are desired.
POPULAR APPLICATIONS INCLUDE:
LOADED / PACKED ASSEMBLY:
Many competing listings include only the bare direct drum or drum with sprag.
This listing includes the loaded components shown in the photos, including the clutch and steel stack when pictured.
This can save the builder time and expense compared with sourcing the drum, sprag, clutches and steels separately.
OEM QUALITY:
This is an original OEM GM transmission hard-part assembly—not a generic low-cost reproduction.
The drum and related components are cleaned and inspected before shipment.
We check the drum, splines, sprag race, clutch area and related surfaces for visible damage and excessive wear prior to sale.
Normal cosmetic marks, discoloration or signs of previous use may be present without affecting intended operation.
IMPORTANT FITMENT VERIFICATION:
GM used multiple direct-drum, sprag, piston, clutch and geartrain configurations throughout the TH400 / 4L80E / 4L85E transmission family.
Before purchasing, compare:
Do not purchase based only on the transmission family name.
If you are unsure about compatibility, send us your transmission information, measurements, original part numbers or clear photos of your current drum and we will help verify fitment before purchase.
PERFORMANCE / RACING NOTE:
This assembly is suitable for builders looking for the 34-element heavy-duty sprag configuration commonly used in towing and performance transmission builds.
Final suitability for horsepower, torque or racing use depends on the complete transmission build, vehicle weight, tuning and installation. No specific horsepower rating is transmission inspection and installation are strongly recommended.
Before installation, inspect:
All clearances and related internal components should be verified according to the correct transmission service procedure before final assembly.
LIFETIME WARRANTY INCLUDED
Purchase with confidence. This OEM heavy-duty direct drum assembly is backed by our Lifetime Warranty.
30-DAY RETURNS:
Refunds and exchanges are accepted within 30 days.
The complete assembly must be returned in its original, untampered condition.
Installed, altered, damaged, disassembled or tampered components may be subject to a partial refund.
No returns are accepted after 30 days.
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