Products

700R4 Short Extension Housing  (#TH10001)
$395.00

700R4 Short Extension Housing (#TH10001)

Speed Gems

Allows for building a 27-inch long 700R4 transmission utilizing a 4x4 output shaft. Comes with bushing, seal and O-ring. NOTE:  27-inch yoke must b...

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$395.00
AMC Rambler 6-Cylinder to Chevy Automatic Transmission (Kit #AMC101)
$1,100.00

AMC Rambler 6-Cylinder to Chevy Automatic Transmission (Kit #AMC101)

Speed Gems

*CALL TO ORDER* Speed Gems806H S. Division St., Waunakee, WI 53597PHONE: (763) 767-4480EMAIL:  sales@transmissionadapters.com

$1,100.00
BH10002  1957-1963 Buick Nailhead to GM 4-and 5-Speed Bellhousing
$395.00

BH10002 1957-1963 Buick Nailhead to GM 4-and 5-Speed Bellhousing

Speed Gems

This is a BRAND NEW cast-aluminum Bellhousing that will allow you to bolt a 3, 4, or 5-speed Manual Transmission to the 1957 thru 1966 Buick Nailhe...

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$395.00
BH10003  Oldsmobile & Cadillac Bellhousing
$395.00

BH10003 Oldsmobile & Cadillac Bellhousing

Speed Gems

This is a BRAND NEW cast-aluminum Bellhousing that fits Oldsmobile (1949 thru 1964) or Cadillac extended bellhousing engines (1949 thru 1954).  T...

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$395.00
BPOC (1969-1975) to Chevy Automatic Transmission (Kit #BPOC101)
$265.00

BPOC (1969-1975) to Chevy Automatic Transmission (Kit #BPOC101)

Speed Gems

Materials Included: (1) Adapter Plate - GM Common 1969-1975 to GM Common(1) Pilot Bushing(4) HCS 3/8-24 x 1-1/4(2) HCS 3/8-16 x 1-1/2(4) FHSCS 3/8-...

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$265.00
BU1001  Buick 364 Nailhead Heavy Duty Cast-Aluminum Stick Kit
from $1,450.00

BU1001 Buick 364 Nailhead Heavy Duty Cast-Aluminum Stick Kit

Speed Gems

*Please indicate what year your engine is in the comments when ordering.1957-63 has a 2.00" Crank I/D1964-66 has a 1.70" Crank I/D*Please indicate ...

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from $1,450.00
BU1002  Buick 401 & 425 Nailhead Heavy Duty Cast-Aluminum Stick Kit
from $1,450.00

BU1002 Buick 401 & 425 Nailhead Heavy Duty Cast-Aluminum Stick Kit

Speed Gems

*Please indicate what year your engine is in the comments when ordering.1957-63 has a 2.00" Crank I/D1964-66 has a 1.70" Crank I/D*Please indicate ...

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from $1,450.00
BU101  Buick Straight-8  233/248/263 w/ orig. Manual Transmission to Chevy Automatic
from $1,250.00

BU101 Buick Straight-8 233/248/263 w/ orig. Manual Transmission to Chevy Automatic

Speed Gems

Materials Included: (1) Adapter Plate-Inner - Buick Straight-8 to Chevy(1) Adapter Plate-Outer - Buick Straight-8 Manual to Chevy(1) Crank Adapter ...

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from $1,250.00
BU201  Buick Straight-8  248/263 w/ orig. Dynaflow to Chevy Automatic
from $1,250.00

BU201 Buick Straight-8 248/263 w/ orig. Dynaflow to Chevy Automatic

Speed Gems

Materials Included: (1) Adapter Plate-Inner - Buick Straight-8 to Chevy(1) Adapter Plate-Outer - Buick Straight-8 to Chevy(1) Crank Adapter - Buick...

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from $1,250.00
BU301  Buick Straight-8  320 w/ orig. Manual Transmission to Chevy Automatic
from $1,250.00

BU301 Buick Straight-8 320 w/ orig. Manual Transmission to Chevy Automatic

Speed Gems

Materials Included: (1) Adapter Plate-Inner - Buick Straight-8 manual to Chevy Auto.(1) Adapter Plate-Outer - Buick Straight-8 manual to Chevy(1) C...

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from $1,250.00
BU401  Buick Straight-8  320 w/ orig. Dynaflow (w/ 3.625" crank flange) to Chevy Automatic
from $1,250.00

BU401 Buick Straight-8 320 w/ orig. Dynaflow (w/ 3.625" crank flange) to Chevy Automatic

Speed Gems

Materials Included: (1) Adapter Plate-Inner - Buick Straight-8 manual to Chevy Auto.(1) Adapter Plate-Outer - Buick Straight-8 manual to Chevy(1) C...

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from $1,250.00
BU501 1953-1956 Buick 264/322 Nailhead to Chevy Automatic Transmission
from $925.00

BU501 1953-1956 Buick 264/322 Nailhead to Chevy Automatic Transmission

Speed Gems

Materials Included: (1) Adapter Plate - Buick Nailhead to Chevy(1) Crank Adapter 1953-56 Buick 264/322 Nailhead to Chevy Auto.(1) Torque Converter ...

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from $925.00
BU601 1957-1963 Buick 364 Nailhead to Chevy Automatic Transmission (w/ 2.90” crank flange)
from $1,075.00

BU601 1957-1963 Buick 364 Nailhead to Chevy Automatic Transmission (w/ 2.90” crank flange)

Speed Gems

Materials Included: (1) Adapter Plate - Buick Nailhead to Chevy(1) Crank Adapter-Inner(1) Crank Adapter-Outer(1) Torque Converter Drive Plate(1) Fl...

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from $1,075.00
BU602 1957-1963 Buick 401/425 Nailhead to Chevy Automatic Transmission (w/ 2.90" crank flange)
from $1,075.00

BU602 1957-1963 Buick 401/425 Nailhead to Chevy Automatic Transmission (w/ 2.90" crank flange)

Speed Gems

Materials Included: (1) Adapter Plate - Buick Nailhead to Chevy(1) Crank Adapter-Inner(1) Crank Adapter-Outer(1) Torque Converter Drive Plate(1) Fl...

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from $1,075.00
BU701 1964-1966 Buick 401/425 Nailhead to Chevy Automatic Transmission
from $925.00

BU701 1964-1966 Buick 401/425 Nailhead to Chevy Automatic Transmission

Speed Gems

Materials Included: (1) Adapter Plate - Buick Nailhead to Chevy(1) Crank Adapter-1964-66 Buick 401/425 Nailhead to Chevy Auto.(1) Torque Converter ...

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from $925.00
BU702 1964-1966 Buick 401/425 Nailhead to Chevy Automatic Transmission (w/ small-hole Flexplate)
from $1,075.00

BU702 1964-1966 Buick 401/425 Nailhead to Chevy Automatic Transmission (w/ small-hole Flexplate)

Speed Gems

Materials Included: (1) Adapter Plate - Buick Nailhead to Chevy(1) Crank Adapter-1964-66 Buick 401/425 Nailhead to Chevy Auto.(1) Torque Converter ...

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from $1,075.00
BU801  Buick Flexplate and Adapter for 1963 & Older Buick 364 to 1964 & Newer Automatic Transmission
from $179.00

BU801 Buick Flexplate and Adapter for 1963 & Older Buick 364 to 1964 & Newer Automatic Transmission

Speed Gems

Materials Included: (1) Buick Tapered Pilot Bushing (PB10009)(1) Flexplate (FP10003)(1) 166W-tooth Ring-gear (RG10004)(1) Balance Weight for Buick ...

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from $179.00
BU802  Buick Flexplate and Adapter for 1963 & Older Buick 401/425 to 1964 & Newer Automatic Transmission
from $179.00

BU802 Buick Flexplate and Adapter for 1963 & Older Buick 401/425 to 1964 & Newer Automatic Transmission

Speed Gems

Materials Included: (1) Buick Tapered Pilot Bushing (PB10009)(1) Flexplate (FP10003)(1) 166W-tooth Ring-gear (RG10004)(1) Balance Weight for Buick ...

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from $179.00
CA101 1954 and up Cadillac 365/390 to Chevy Automatic
from $1,100.00

CA101 1954 and up Cadillac 365/390 to Chevy Automatic

Speed Gems

Materials Included:  (1) Adapter Plate - 1954 & up Cadillac to Chevy Automatic(1) Crank Adapter(1) High Torque mini-Starter(2) HCS 3/8-16 x 3-3...

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from $1,100.00
CA102 1954 and up Cadillac 365/390 to Chevy Manual
from $1,450.00

CA102 1954 and up Cadillac 365/390 to Chevy Manual

Speed Gems

*This kit includes everything you will need to mate your 365 or 390 to a manual transmission. There is no need to buy additional parts when you ord...

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from $1,450.00
CA201 1942-1948 Cadillac 346 Flathead w/Hydra-matic to Chevy Automatic
from $1,350.00

CA201 1942-1948 Cadillac 346 Flathead w/Hydra-matic to Chevy Automatic

Speed Gems

*This kit will only fit the 346-Cadillac Engine that originally had a Hydra-matic Transmission.   Materials Included: (1) Adapter Plate-Inner - Cad...

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from $1,350.00
CA401 1949-1953 Cadillac 331 to Chevy Automatic
from $1,650.00

CA401 1949-1953 Cadillac 331 to Chevy Automatic

Speed Gems

Materials Included: (1) Adapter Plate - Olds/Cadillac 1949-1964 to Chevy(1) Crank Adapter - Olds/Cadillac 1949-1964 to Chevy(1) Torque Converter Dr...

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from $1,650.00
CA501 1949-1953 Cadillac 331 to Chevy Manual
from $1,650.00

CA501 1949-1953 Cadillac 331 to Chevy Manual

Speed Gems

Materials Included: (1) Bell Housing - 1949 Old/Cad to Chevy Manual(1) Flywheel(1) Starter(1) Starter Block - Multiple Olds/Cadillac applications(1...

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from $1,650.00
CA601  Cadillac 429 to 700R4
$750.00

CA601 Cadillac 429 to 700R4

Speed Gems

Materials Included: (1) Adapter Plate - Cadillac 429 to Chevy 700R4(1) Torque Converter Spacer(1) Pilot Bushing - Cadillac 429 to 700R4(2) Dowel Pi...

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$750.00