A common problem in GM 200-4R and 4L60 transmissions is burned bands and/or 3-4 clutches. This failure can be reduced by eliminating throttle boost oil leaka
Sonnax GM 200-4R Transmission
Sonnax Oversized Pressure Regulator Valve - 77917-07
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Sonnax TV Boost Valve Kit - 77917-500
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TV Mega Boost Valve, Sonnax 77917-04K, 2 piece Kit, Size: .500, Factory-Style sleeve (no O-rings), Browse our Shop for all our Sonnax branded Parts!
Sonnax 77917-04K, 700R4 / 200-4R TV Mega Boost Valve Kit
200-4R Boost Valve & Sleeve - Cobra Transmission
200-4R, 4L60 TV Boost Valve Kit Part No. 77917-04K .500 Bore Dia., Factory-Style Sleeve 200-4R, 4L60 TV Boost Valve Kit Part No. 77917-04K .500 Bore
Sonnax 77917-04K TV Boost Valve Kit .500 Dia., Factory-Style Sleeve (No O-Ring)
Sonnax Dual-Ratio Boost Valve Kit - 97741-01K
Sonnax GM 200-4R Transmission
Sonnax 77917-04K TV Boost Valve Kit .500 Dia., Factory-Style Sleeve (No O-Ring)
