200 4R Reference

OEM 200-4R-Sonnax-VB GM 200-4R Sonnax Valve Body Kit: Symptoms, Specs & Install

Name: GM 200-4R Sonnax Valve Body Kit (OE# 200-4R-Sonnax-VB)
SKU: 200-4R-Sonnax-VB
Availability: InStock

If you searched for 200-4R-Sonnax-VB, this is the part. GM 200-4R Sonnax Valve Body Kit for the 200 4R. Below: failure symptoms, electrical specs, install procedure.

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What it does

Sonnax HD valve body upgrade for the classic GM 200-4R. Industry-standard fix for muscle car and high-HP applications.

Fitment

1981-1990 GM Buick Grand National, Monte Carlo SS, Olds 442, Chevy Caprice with 200-4R.

Common failure symptoms

Soft shifts, no overdrive lockup, harsh 1-2 shift, 200-4R failing under boosted/HP applications

Electrical / install specs

Includes pressure boost, accumulator, TCC regulator.
Designed for 500+ HP applications.

Run a resistance check before condemning. Bad wiring, corroded harness pins, or a failing PCM driver can cause identical symptoms.

Replacement procedure

Drop pan and filter
Remove valve body
Disassemble per Sonnax instructions
Install Sonnax kit components (springs, valves, accumulators)
Reassemble
Refill with Dexron III or Dexron VI
Verify pressure rises at WOT — should hit 200 psi on a properly tuned 200-4R

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