Genuine ATP throttle valve detent cable with bracket and grommet for the GM 700R4 and 200-4R; it sets TV line pressure so the trans shifts right and does not burn up.
If your 700R4 or 200-4R suddenly shifts early and soft, slips on the 2-3 or 3-4 under throttle, or will not kick down when you floor it, check the throttle valve cable before you blame the transmission. On a 1982-1986 Chevy C10 or K10 pickup, a 1983-1990 G-van, a 1986-1990 Astro or Safari, a 1988-1992 C1500 or K1500, or an 80s Camaro, Firebird or Caprice, the factory cable is now 35-plus years old. The ATP Y-228 is a new replacement detent/TV cable for those GM applications, with an adjustable self-ratcheting slider at the throttle end.
On a TH350 the cable is just a kickdown. On a 700R4 and 200-4R it is the transmission's only load sensor. The cable pulls a lever on the side of the case, the lever strokes the TV plunger in the valve body, and the plunger meters throttle (TV) pressure to the boost valve in the pump. More throttle means more TV pressure, and more TV pressure means higher line pressure, later shifts and firmer clutch apply. The same signal decides part-throttle and full-throttle downshifts. A cable that is broken, stretched, kinked or adjusted short gives the valve body almost no TV pressure, so the clutches see idle-level clamping force at full engine torque. That is how a good 700R4 gets burned up in a few miles. We walk through the whole circuit in our guide to the 700R4 TV cable versus the 4L60E electronic pressure control.
The 700R4 has no computer and no trouble codes for any of this. Diagnosis is mechanical.
With the engine off, have a helper hold the throttle wide open and look at the cable at the carb or throttle body. It should travel fully and snap back with no drag. Then look at the case end: a cable that has pulled out of its bore or has a broken lock tab is obvious. The best test is a line pressure gauge on the case. Pressure should climb as you add throttle; if it sits flat, either the cable is not pulling the TV lever or something inside the valve body is worn. A worn TV plunger sleeve or a leaking boost valve can mimic a cable problem, so read our 700R4 valve body testing guide before you replace parts on the transmission side. For burnt 3-4 clutches and the rest of the common list, see 700R4 common problems and fixes.
The ATP Y-228 is listed for a wide spread of 1981-1993 GM applications. Catalog coverage includes 1982-1986 Chevrolet C10, C20, K10, K20, K5 Blazer and Suburban and the GMC equivalents, 1987 R/V trucks and 1987-1991 R/V Suburbans, 1988-1992 C/K 1500 and 2500 pickups, 1983-1990 G10/G20/G30 and GMC G-series vans, 1986-1990 Astro and Safari, 1983-1987 Camaro and Firebird, and 1982-1990 Caprice. It interchanges with several GM cable numbers, including 14102146 and 25515598, and with Dorman 4217 and Pioneer CA-1970.
Be careful with two things. First, catalogs disagree on length: the product spec lists 41.75 inches while the fitment notes say 44 inches, so measure your old cable housing end to end and compare. Second, the same cable is catalogued for some GM front-wheel-drive cars that used other cable-controlled transmissions, so the vehicle fitting it does not prove you have a 700R4. Some G-van and Caprice listings note a 16-bolt pan. If your truck has a carb or EFI swap, the bracket geometry matters more than the cable itself. When in doubt, send us your year, model, engine and VIN and we will check it. Browse everything else we carry for this unit on our 700R4 parts page.
If the transmission already slipped long enough to smell burnt, a new cable will not heal glazed clutches. Pair the repair with a 700R4 shift kit to firm up apply, or plan a reseal with the 700R4 overhaul kit. A weak 700R4 pump can also hide behind a cable complaint, which we cover in 700R4 pump failure symptoms.
| Fits | GM 700R4 (4L60) and 200-4R (TH2004R) automatics |
| Part Number | ATP Y-228 |
| Function | Throttle valve (TV) / detent cable — controls line pressure and shift feel |
| Includes | Cable, mounting bracket, case grommet, throttle-end fitting |
| Material | Polymer-insulated cable, corrosion and abrasion resistant |
| Brand | ATP Automotive |
| Warranty | ATP 1-year limited |
No. On the 700R4 and 200-4R it sets line pressure and shift points at every throttle position, and it also controls part-throttle and full-throttle downshifts. A loose or broken cable lets the clutches slip under load.
The Y-228 is catalogued for 1982-1986 C10 and K10 pickups. Measure your old cable before ordering because catalogs list both 41.75 and 44 inch lengths, or send us your year, engine and VIN.
Engine off, press the adjuster tab, push the slider fully back, release the tab, then turn the throttle to wide-open. The cable ratchets itself to length. Then check that it returns freely with no binding.
The cable will, but the throttle bracket has to give the right pull. TCI specifies 1-7/64 to 1-1/8 inch from throttle shaft to cable stud and about 78 degrees of travel. Most swap problems come from the bracket, not the cable.
Dexron ATF. Current Dexron-VI fluid is backward compatible with the older Dexron grades the 700R4 originally used.
Only if the clutches are not damaged yet. If the fluid is dark and smells burnt, the 3-4 clutches or the 2-4 band are likely glazed and need an overhaul in addition to the cable.
