200-4R Planetary, used and ready to install. Fits the 200-4R. Ships fast from the USA.
A 200-4R that whines in first and reverse, will not hold in first gear in Drive, or has dumped bronze-colored flakes and steel glitter on the pan magnet usually has a problem at the very back of the gear train. This listing is a used, cleaned GM 200-4R low/reverse planetary: the rear planet carrier with its pinions and the clutch hub that the low/reverse plates and the low roller clutch work on. Rebuilders call it the low/reverse planet, and it came out of a 200-4R of the type used in 1981-1990 Buick Grand National, Regal, Monte Carlo, Cutlass, Caprice and other GM full and mid-size cars.
GM built the 200-4R by taking the three-speed TH200 and adding an overdrive planet set, drum and clutches to the front of it. The low/reverse planet sits at the far end of that original TH200 section, next to the output. It is the reaction member for the two highest-torque ranges the transmission has. In first gear in Drive the low roller clutch stops the carrier from turning backward, so the forward clutch can drive the gear train through the lowest ratio. Lift off the throttle and the roller clutch freewheels, which is why Drive-range first gear has no engine braking. In manual 1 and in Reverse the low/reverse clutch pack clamps the same carrier instead, and in Reverse the direct clutch turns the sun gear against that held carrier to drive the output backward.
Because the carrier carries full launch torque in first and reverse, its pinion pins, pinion needle bearings, thrust washers and hub splines take more abuse than any other planet in the unit, especially behind a turbocharged V6 or a modified V8.
Use the ranges to split the holding devices. If the car pulls in manual 1 but slips or will not move in Drive first, the low roller clutch is not holding, and the race and hub on this carrier assembly need inspection. If Drive is fine but Reverse and manual 1 both slip, suspect the low/reverse clutch pack or its piston seals first; that is the more common cause and is covered by an overhaul kit. A noise-only complaint with good clutch function points at the pinions. Check line pressure and the TV cable before condemning hard parts; our 200-4R common problems guide walks through those checks, and the delayed engagement guide covers slow Drive and Reverse engagement from internal leakage.
This carrier is a GM 200-4R part from the 1981-1990 production run, when the 200-4R went into B, C, D and G-body GM cars. The listing does not tie the part to one donor vehicle or year, so match it to your own carrier before you order: compare the hub spline count, the number of pinions, the overall height and the roller clutch race against the old part on your bench. If you are unsure, send us your year and VIN, or a photo of your carrier, and we will check it. All of our 200-4R parts are listed on the 200-4R parts page.
If the noise came with metal debris, flush the cooler and lines before the rebuilt unit goes back in, so leftover particles do not chew up the new pinion bearings. The sun gear shell rides directly ahead of this carrier, so look over its splines and tangs while the case is empty; we stock a used 200-4R sun shell if yours is worn.
| Fits | 200-4R |
| Part type | Planetary |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is the low/reverse planet at the rear of the 200-4R's TH200 gear train, the carrier that the low roller clutch and the low/reverse clutch hold. It is not the overdrive planet at the front of the case.
It is a GM 200-4R part from that production run. Compare hub spline count, pinion count and the roller clutch race to your old carrier, or send us your year and VIN before ordering.
Sometimes, but a worn low/reverse clutch pack, a leaking piston seal or a stripped sun shell are more common. Check whether manual 1 also slips; if Drive works but Reverse and manual 1 do not, start with the clutch pack.
Thrust washers and bearings, the low/reverse frictions and steels, the piston seals, and the low roller clutch if it shows wear. A master rebuild kit covers the soft parts.
Use a GM-licensed Dexron automatic transmission fluid. GM states DEXRON-VI is the fluid for transmissions that originally called for earlier DEXRON grades.
