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200-4R dip stick and tube with locking top

Part Number: 200-filler-tube

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200-4R dip stick and tube with locking top. This late model dip-stick has a locking top to prevent blow-out and make a positive seal

200-4R Information

In 1980, for the 1981 model year, the 200-4R (sometimes called 200R4) was introduced for use in GM vehicles. Internally, the components which were prone to failure in the THM200 were improved, and this transmission was used with high-power applications — primarily the Buick Grand National and the 1982 Chevy Corvette. GMs powered with the Oldsmobile 5.7 L Diesel powerplant were coupled with the 200-4R in place of the 200. The 200-4R was configured with several different torque converters and gear ratios depending on the vehicle application.

Unlike the 700R4, the 200-4R has a multicase bellhousing for use with Chevrolet, Buick/Olds/Pontiac (BOP), and Cadillac powerplants. Since the external dimensions are similar to the THM-350, 200-4Rs are often swapped in place of THM-350s in older vehicles to provide an overdrive gear. (However, in situations where case clearance and the need for drive shaft modification isn't an issue, the TH400 is more of a close mounting match to the 200-4R. Placement of the mount is identical. The yoke needs to be changed in most circumstances, and the drive shaft length will be different as well.)

Early models had PRND321 on the cluster, while later models had PRN(D)D21, with the left D identified as the overdrive gear by a square or oval ring.

The THM200-4R was phased out after 1990 — its final usage was in the GM B-body lineup (Chevrolet Caprice, Oldsmobile Custom Cruiser station wagon, Cadillac Brougham) coupled to either a Chevrolet 305 or an Oldsmobile 307 engine. It is believed that an HD version of the 200-4R was used in the late 80s Caprice 9C1 police package using the internals from the Buick Grand National.