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 Transmission Company Automatic Transmission Boost Valves - Free Shipping on Orders Over $109 at Summit Racing
Sonnax Oversized Pressure Regulator Valve - 77917-07
200-4R Mega Boost Valve, Sonnax 77917-500
48RE Sonnax Sure Cure Valve Body Kit Complete SC-48RE (03-10) - Trans Parts Direct
Sonnax 22771-03K Transmission Throttle Valve Kit 48RE A500 A518 A618 0 — MaxxIndustries
SONNAX TRANSMISSION & VALVE BODY PARTS & TOOLS
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Sonnax 200-4R 4L60 TV Boost Valve Kit (#77917-500)
Sonnax Tv Boost Valve Kit, GM, 200-4R, 4L60 Commodore VS to VE 4L60E.471in. Dia., Each - SONNAX
Sonnax Transmission Company Automatic Transmission Boost Valves - Free Shipping on Orders Over $109 at Summit Racing
L2theW 700R4 Transmission Assembly - Part 5, The Input Housing, Raybestos 3-4 Z-Pak Clutch Setup
Sonnax GM 200-4R Transmission
Sonnax GM 200-4R Transmission
700R4 boost valve, Order On Line, 700R4 transmission parts
SNX-77917-500
700R4 .500 Boost Valve and Sleeve With O-Ring Sonnax 200-4R 4L60 Transmission TV Throttle
700R4 200-4R TV Boost Valve Kit w/ Factory-Style Sleeve - Sonnax - Global Transmission Parts