Raybestos Kevlar 2-4 band for 700R4, 4L60, 4L60E, 4L65E and 4L70E builds. Holds harder than a paper band under towing heat and high torque.
A 4L60E that flares on the 1-2 shift, slips in overdrive, or suddenly starts off in 3rd with no 2nd or 4th has usually burned its 2-4 band. This is the Raybestos Pro-Series RPS77765 band for the GM 700R4, 4L60, 4L60E, 4L65E and 4L70E, 1982 and up, with a Kevlar fiber blend lining instead of the standard paper material. It is the band to put in a Silverado or Tahoe that tows, a Camaro that launches hard, or any rebuild where the last band came out glazed.
The band wraps the reverse input drum and holds it still in 2nd and 4th gear. In 2nd, the servo clamps it to give the 1-2 shift; on the 2-3 it releases as the 3-4 clutch applies; on the 3-4 it applies again for overdrive. That means the band takes the heat of two upshifts on every trip, and it has to hold the full torque of the engine in 4th at highway speed. When fluid gets hot from towing or a converter that slips, a paper lining glazes and loses grip. The Kevlar lining on this band is rated by Raybestos to 700 degrees F, so it keeps its friction when a paper band would start to slide. At 2.6 inches wide with heat-treated anchors, it is a direct OE-width replacement, not a wide band that needs a different drum.
Note which gears are missing. A band failure takes out 2nd and 4th but leaves 1st, 3rd and reverse; a slipping 3-4 clutch shows up in 3rd and 4th instead. Pull the pan and look for friction material, then check the servo pin and seals, because a leaking servo will burn a new band in short order. Our 4L60E shift problems guide lays out which components work in each gear, and the 4L60E common problems guide explains the 3-4 clutch and sun shell failures that get mistaken for band trouble.
Fits the GM TH700-R4 / 700R4, 4L60, 4L60E, 4L65E and 4L70E from 1982 on. That includes the 1993-2013 Silverado and Sierra 1500, Tahoe, Yukon, Suburban, S10, Sonoma, Blazer, Camaro and Corvette. Part number RPS77765 (also listed as A74020BAHK) is the standard 2.6 inch width, so it works with the stock drum and either the stock servo or a larger Corvette-style servo. See every part for this unit on our 4L60E transmission parts page, and send year plus VIN if you want fitment confirmed.
Band failures rarely travel alone. If the fluid was burnt, the 3-4 pack and pistons have usually seen the same heat; the bonded piston set and a rebuild kit with high energy clutches cover the rest of the job.
| Part number | Raybestos RPS77765 (A74020BAHK) |
| Position | 2nd/4th (2-4) band |
| Fits | GM TH700-R4 / 700R4, 4L60, 4L60E, 4L65E, 4L70E, 1982-on |
| Width | 2.6 in |
| Friction material | Kevlar fiber blend |
| Anchors | Heat-treated |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It fits the full TH700-R4 family from 1982 on: 700R4, 4L60, 4L60E, 4L65E and 4L70E. All of these use the same 2-4 band position.
No. It is the standard 2.6 inch width, so it fits the stock reverse input drum. Replace the drum only if its band surface is scored, blued or out of round.
Kevlar handles heat well and tends to last in towing and high-torque use, while red high-energy linings give a firmer bite. For a work truck or tow rig, Kevlar is the safe choice.
Check the servo seals and apply pin, inspect the reverse input drum, and look at the 3-4 clutch pack. A leaking servo or worn drum will ruin a new band quickly.
Yes. Soak it in fresh ATF for at least 20 minutes so the lining is saturated before the first apply.
