Rebuild of the 4-Speed Hydra-Matic Transmission

1954 Chevrolet 3100 (1/2 ton) Truck - RPO (Regular Production Option) 314
photos by Gene BerckRestoration Hydramatics

page 1 Disassembly - Teardown
page 1   page 2   page 3   page 4   page 5   page 6   page 7   page 8   page 9   page 10
one 2 4



3 four four
result of bad rear-main (drive shaft) seal

1954 Chevrolet Hydra-Matic

time for a an engine rebuild?

olds tank no pedal






three hq 71



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99 hm scross section 54 green



page 1 Disassembly - Teardown
page 1   page 2   page 3   page 4   page 5   page 6   page 7   page 8   page 9   page 10

1954 was the first year the Hydra-Matic was used in a Chevrolet truck
1954 was the last year for the enclosed (torque-tube) driveshaft in 1/2 ton trucks

the Hydra-Matic transmission was first used in a 1939 Oldsmobile
the Hydra-Matic transmission was used in WWII light tanks
the dual-range Hydra-Matic 1952 GMC PM-150-22
in 1953, GMC provided an optional Hydra-Matic in 100-250 series trucks (1/2 to to 1 ton trucks)
in 1955, GMC provided a 21 forward-speeds Hydra-Matic in large trucks


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