Turbo 400 3L80 Valve Bodies & Parts

Valve Bodies & Parts for GM Turbo 400 / 3L80 automatic transmissions: 23 parts from Superior Transmission Parts, TransGo, Sonnax and Fitzall and other makers.

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Valve Body Parts & Shift Kits

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Fitzall

GM Mechanical Modulator (Designed for TH400 Swaps from 700R4 on 6.2L Diesels)

Part number: 40M A mechanical modulator from Fitzall that replaces the vacuum modulator when swapping a 700-R4 transmission onto a TH400 in 6.2L diesel engine conversions. It lets the TH400 use...

MSRP:

Now: $199.95
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Central Valve Bodies

Rebuilt TH400 Valve Body (1987-UP)

Part number: Rebuilt TH400 valve body for units from 1987 and up, from Central Valve Bodies. Confirm your TH400 dates from 1987 or later before ordering.

MSRP:

Now: $225.00
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Rostra Precision Controls

TH350 TH400 TH250C Modulator (1965-UP) Red Stripe

Part number: 1450 A modulator for GM TH350, TH400 and TH250C transmissions built 1965-UP, sold under our Red Stripe line. It runs without a gas EGR feature and is adjustable from 12-15 pounds, and is...

MSRP:

Now: $19.95
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Precision International

Check Ball, 1/4'' (Single) 8631975

Part number: 1247 A single 1/4 inch valve body check ball, made by Precision International. It replaces OEM part number 8631975 and is used across many automatic transmission platforms that share...

MSRP:

Now: $0.25
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Fitzall

GM Mechanical Modulator (Designed for TH400 Swaps from 700R4 on 6.2L Diesels)

Central Valve Bodies

Rebuilt TH400 Valve Body (1987-UP)

Rostra Precision Controls

TH350 TH400 TH250C Modulator (1965-UP) Red Stripe

Precision International

Check Ball, 1/4'' (Single) 8631975