Tired of breaking 4L60E's?
Specializing in Racing Automatics, GM LSx crate engines, parts, and retrofits, Performance Engine Building and Installation, and complete musclecar service.
TH400's are what we cut our teeth on. We have extensive experience building the TH400 for all types of applications. We do stock rebuilds all the way up to 1500+ HP Monster Truck applications.
Our "stock" rebuild is strong enough for over 600 HP repeatedly yet functions like a stock transmission.
We specialize in building TH400's for forced induction street driven applications where the customer wants the comfort of retaining the automatic shifting features. Many builders don't know how to make the trans live with boost and still shift automatically, so they recommend a full manual valve body. We have automatic shifting TH400's in turbocharged applications approaching 1000 HP.
We prefer you call in before ordering so that we can help you select the transmission that best meets your needs. Each unit is custom built so not all available options are available on the checkout cart.
Our Stage I TH400's don't shift brutally hard, we are able to keep them reliable by using many of the features GM designed into them. Crisp shifts at part throttle progressively getting firmer with throttle. Very streetable and very reliable.
As with all Jake's Performance transmissions they include all new friction clutches, bands, steel plates, soft parts, filter, modulator (if applicable), as well as hydraulic upgrades, bearings added at several thrust locations, and other modifications depending on power level.
"Stage I" TH400 is the basic rebuild with valve body and hydraulic improvements, rollerized rear thrust, heavy duty intermediate snap ring, and new chrome transmission pan. 450 HP/TQ capable.
Our Stage II TH400 includes all the components in the Stage I rebuild but is upgraded to a 34 element sprag and the corresponding direct drum, 6 clutch direct with carbon based frictions, 4 clutch intermediate, manual/automatic valve body or forward pattern full manual upon request. OEM Deep pan and additonal modifications. 750 HP/TQ capable.
Stage III TH400 has all the features of the Stage III but includes a billet input shaft, forward hub and intermediate shaft. Deep cast aluminum pan is standard. Reverse manual valve body with transbrake is standard. 1000+ HP/TQ capable. The Griner Aluminum Transbrake with or without safe neutral is an optional upgrade.
Other upgrades available include a billet aluminum direct drum assembly for 7,000+ rpm applications, please add this option to your cart seperately.
Aluminum Direct Drum Option for Stage III TH400's.
Stage 4 TH400 has all the features of the Stage III but includes the 36 element Super Drum for more reliability at power levels over 1000 HP.
Stage 5 TH400 uses a Griner billet Aluminum valve body and eliminates the intermediate sprag. Ultrabell is standard.
Approximately a 2 week lead time is required on most transmissions. Our more common units (Stage I and Stage II) may be in stock.
Please note:
Shipping fees are estimated based on pickup from Jake's Performance and delivery within the continental U.S. to a freight terminal or business with loading dock or forklift. Any other shipping methods will require you to call us for a quote.
JW Ultrabells (including Ford and Chrysler patterns), CSR SuperShields $315 with trans order, custom built Billet Converters from $750, 2.10, 2.75 and other ratio gearsets.
Transbrakes available for $350 additional. Reverse pattern valve body is $125 additional.
4340 input shafts, mainshafts, 36 element sprag "Super Drum", electronic speedometer for late model conversions, variable pitch builds, and other options available.
We also sell the components for you to rebuild your own TH400 to our specs. See our Transmission Kits page.
Our "stock" rebuild is strong enough for over 600 HP repeatedly yet functions like a stock transmission.
We specialize in building TH400's for forced induction street driven applications where the customer wants the comfort of retaining the automatic shifting features. Many builders don't know how to make the trans live with boost and still shift automatically, so they recommend a full manual valve body. We have automatic shifting TH400's in turbocharged applications approaching 1000 HP.
We prefer you call in before ordering so that we can help you select the transmission that best meets your needs. Each unit is custom built so not all available options are available on the checkout cart.
Our Stage I TH400's don't shift brutally hard, we are able to keep them reliable by using many of the features GM designed into them. Crisp shifts at part throttle progressively getting firmer with throttle. Very streetable and very reliable.
As with all Jake's Performance transmissions they include all new friction clutches, bands, steel plates, soft parts, filter, modulator (if applicable), as well as hydraulic upgrades, bearings added at several thrust locations, and other modifications depending on power level.
"Stage I" TH400 is the basic rebuild with valve body and hydraulic improvements, rollerized rear thrust, heavy duty intermediate snap ring, and new chrome transmission pan. 450 HP/TQ capable.
Our Stage II TH400 includes all the components in the Stage I rebuild but is upgraded to a 34 element sprag and the corresponding direct drum, 6 clutch direct with carbon based frictions, 4 clutch intermediate, manual/automatic valve body or forward pattern full manual upon request. OEM Deep pan and additonal modifications. 750 HP/TQ capable.
Stage III TH400 has all the features of the Stage III but includes a billet input shaft, forward hub and intermediate shaft. Deep cast aluminum pan is standard. Reverse manual valve body with transbrake is standard. 1000+ HP/TQ capable. The Griner Aluminum Transbrake with or without safe neutral is an optional upgrade.
Other upgrades available include a billet aluminum direct drum assembly for 7,000+ rpm applications, please add this option to your cart seperately.
Aluminum Direct Drum Option for Stage III TH400's.
Stage 4 TH400 has all the features of the Stage III but includes the 36 element Super Drum for more reliability at power levels over 1000 HP.
Stage 5 TH400 uses a Griner billet Aluminum valve body and eliminates the intermediate sprag. Ultrabell is standard.
Approximately a 2 week lead time is required on most transmissions. Our more common units (Stage I and Stage II) may be in stock.
Please note:
Shipping fees are estimated based on pickup from Jake's Performance and delivery within the continental U.S. to a freight terminal or business with loading dock or forklift. Any other shipping methods will require you to call us for a quote.
JW Ultrabells (including Ford and Chrysler patterns), CSR SuperShields $315 with trans order, custom built Billet Converters from $750, 2.10, 2.75 and other ratio gearsets.
Transbrakes available for $350 additional. Reverse pattern valve body is $125 additional.
4340 input shafts, mainshafts, 36 element sprag "Super Drum", electronic speedometer for late model conversions, variable pitch builds, and other options available.
We also sell the components for you to rebuild your own TH400 to our specs. See our Transmission Kits page.
