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The Autosports Engineering LS to 8HP conversion kit adapts a Mopar/Ram ZF 8HP eight-speed automatic transmission to any Gen 3, Gen 4, or Gen 5 GM LS or LT engine. The kit includes a billet torque converter flex plate that fully replaces the weak stamped-steel OEM LS/LT flex plate, a billet engine-to-transmission adapter plate with an integrated dust shield, and a press-fit steel converter pilot adapter.
The flex plate in this kit is a full replacement for the factory LS/LT unit — not a converter spacer that leaves the stock stamped plate in service. On a high-torque swap the OEM plate is the weak link long before the transmission is. CNC machined from heat-treated billet 6061-T6 aluminum and engraved.
The steel pilot adapter presses into the factory pilot bearing register in the crankshaft rather than slip-fitting, which keeps the converter concentric to the crank and eliminates the rattle common to loose-fit adapters. Both common ZF converter pilot diameters are covered — 46mm and 34mm adapters are included, so there is no need to identify your converter before ordering.
Running a used transmission? Fluid and filter should be changed before it goes in the car. Budget for a ZF service kit alongside this adapter.
Will this kit work with car-platform 8HP transmissions from a Charger or Challenger?
Yes. Be aware that the car versions of the ZF 8HP do not have a provision for a passenger-side starter, so the bellhousing will need to be trimmed to clear the LS/LT starter snout. Truck-spec transmissions have the pocket already.
Does this require modification to my engine or transmission?
The engine side is a bolt-on. On the transmission side, the Mopar 8HP has starter provisions cast into both sides of the bellhousing. Because the LS platform cannot run a driver-side starter, that casting is unused on this swap — and depending on your header choice, the boss on the driver's side may need to be relieved for clearance. Header designs vary too widely for us to predict this, so plan for the possibility.
Do I need to reuse my stock flex plate or pilot bearing?
No. Both come out and stay out. The billet flex plate in this kit replaces the factory unit entirely, and the pilot adapter takes the place of the pilot bearing or bushing.
What flywheel bolts does this use?
Standard-length OEM GM or ARP manual transmission flywheel bolts, 6 or 8 depending on your crank. Bolts are not included — use ARP for anything making real power, torqued to ARP spec with thread locker and ARP lube under the head.
Will this work with an aftermarket oil pan?
Yes. The adapter plate uses all seven fasteners with a factory GM cast oil pan for maximum rigidity, or five fasteners with a fabricated steel pan. Both configurations are supported by the included hardware.
Does this include the transmission, torque converter, or controller?
No. This is the mechanical adapter package only — adapter plate, flex plate, pilot adapter, and hardware. You will source the 8HP, converter, controller, driveshaft adapter, and mount separately.
All standard non custom made to order items are eligible for return within 30 days of purchase. To request a return purchaser must email us or call to request Instructions on how to proceed with returning an item. Upon receipt of your return you will be issued a return within 3-5 business days. Any custom order items will only have 7 days from the date of purchase/payment to request a cancellation/refund. Beyond that time frame you will be issued a refund up to 30 days from purchase minus a 20% restocking/cancellation fee. All refunds will be issued in the same form as your payment was made/ If you purchase via PayPal your refund will be via PayPal etc. Buyer is responsible for all costs associated with the return of an item as far as shipping/freights go. All items must be return in NEW unused condition. Any damage to the item with be due a 20% minimum restocking fee. Exchanges for product defect or warranty will not incur any restocking charges and shipping charges will be credited as well.
