Replaces the 3-4 clutch pack in GM 4L60E and 700R4 units with Red Eagle high-energy frictions, the pack that burns first under load.
Building a 700R4 or 4L60E for a truck that tows, a Camaro or Firebird with a stall converter, or a Silverado that just lost third and fourth? The 3-4 clutch is the pack that fails first in these transmissions, and this is a direct upgrade for it. TCI part number 374190 is a matched set of Red Eagle high-energy friction discs and steel plates for the 3-4 drum, made in the United States, and it fits the GM 700R4 from 1982-1993 and the 4L60 and 4L60E from 1993 on. It is just the 3-4 pack, so it suits a builder who already has seals and gaskets or is upgrading one clutch on a fresh rebuild.
The 3-4 clutch sits in the input housing. It applies on the 2-3 shift and stays applied in fourth, so any truck cruising in overdrive is loading it constantly. When it is new the stack clamps tight and passes torque without slipping. As the factory frictions glaze, they lose grip, slip on each shift and heat up, and the slip feeds itself until the linings are gone. Red Eagle is a high-energy friction material used in performance builds because it tolerates more heat during engagement than stock paper. That makes it a sensible choice behind a higher stall converter, a towed load or a modified engine, where the stock 3-4 pack is most likely to burn.
No third and fourth can also come from stripped reaction sun shell splines, a known 4L60E failure, so confirm which one you have on teardown.
A burned 3-4 pack is usually a symptom. Sonnax traces most 3-4 slipping to low line pressure or third gear oil leaks, and its tech notes also blame the weak factory backing plate, which flexes during apply and lets heat build unevenly through the stack. Air check the input drum, inspect the 3-4 piston for cracks, and check the pump and 3rd accumulator area before you trust a new pack. Our 3-4 clutch failure diagnosis guide has the full checklist, and the friction count and upgrade guide compares stock and aftermarket stack-ups.
Listed for the GM 700R4 (1982-1993) and the 4L60 and 4L60E (1993 and up) in Silverado, Sierra, Tahoe, Yukon, Suburban, Blazer, S-10, Astro, Camaro, Firebird and Corvette. Input housings, piston styles and plate counts changed over the years and differ between V6 and V8 applications, so count your existing plates and measure clearance on assembly. If you want us to check before you order, send the year and VIN. More parts for this unit are on our 4L60E shop page.
The pack ships at about 2.85 lb. Break it in with easy driving for the first few hundred miles before towing or hard launches.
| Part number | TCI 374190 |
| Fitment | GM 700R4, 4L60, 4L60E |
| Clutch pack | 3-4 (third and fourth gear) |
| Friction material | Red Eagle high-energy |
| Contents | Red Eagle friction discs and steel plates |
| Made in | United States |
| Shipping weight | 2.85 lb |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. TCI 374190 is listed for the GM 700R4 (1982-1993) and the 4L60 and 4L60E (1993 and up). Count your old plates and check clearance on assembly, because housings and plate counts vary by year.
A matched set of Red Eagle friction discs and steel plates for the 3-4 clutch. Seals, the piston, backing plate and gaskets are not included.
Red Eagle is a high-energy friction that handles more engagement heat than stock material, which helps the 3-4 pack survive towing, a higher stall converter or extra engine power.
At least 30 minutes in clean ATF before installation. Use Dexron VI for a 4L60E.
Not always. A stripped reaction sun shell causes the same symptom. Burnt 3-4 frictions are more likely if the fluid smells burnt and there was a flare on the 3-4 shift before it failed.
Follow the spec for your housing and pack. Alto, for example, recommends .025 to .040 inch for its Red Eagle 3-4 PowerPack, measured with a feeler gauge after air checking. Set it with a selective plate or snap ring.
