No Compromise Overdrives !



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 3000+ HP Pro-Mods.
Our "stock" rebuild is strong enough for over 600 HP repeatedly yet functions like a stock transmission.
Our TH400's use exclusive proprietary parts that are only available in our builds as well as techniques that your normal transmission shop or builder is likely not aware of.

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 also cater to you Ford guys. If you need a stout TH400 for your Mustang, Lightning, or other Mod Motor or SBF, BBF combo, give us a call.

We prefer you call in before ordering so that we can help you select the transmission that best meets your needs.

Our Stage I TH400's are an upgraded "stock" type build. These are designed to replace a daily driver TH400 behind a stock or near stock engine and have increased service life due to our hydraulic, mechanical, and lubrication upgrades. They 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 start with a select core that is disassembled, the case is blasted clean, hot tanked, pressure washed, inspected, painted and prepped for reassembly. They also 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.

Street/Strip and Drag Racing TH400's

"Stage I" TH400 is a heavy duty rebuild with valve body and hydraulic improvements, rollerized rear thrust, heavy duty intermediate snap ring, and OEM pan. 450 HP/TQ capable but proven at much higher HP levels.

400-1A Auto Shift $1300
400-1M Full Manual Forward Pattern $1350
400-1RM Reverse Manual without engine braking $1450


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. Aluminum Deep pan and additonal modifications.  750 HP/TQ capable.

400-2A Automatic Shift with manual downshift control $1550
400-2M Full Manual Forward Pattern with engine braking $1600
400-2RM Full Manual Reverse Pattern without engine braking $1700
400-2RMEB "RockCrawler" Full Manual Reverse Pattern with engine braking $1850
400-2RMTB Reverse Pattern with transbrake $1850
400-2ATB Automatic Shift Forward Pattern with transbrake-$2050

400-2G10 Griner G10 Valve Body $2150
400-2G10B Griner G10B "Band On" Valve Body (great for turbo combos) $2200

Fully rollerized upgrade add $300. (includes all thrust areas between drums, planetary sets, case, center support, and pump, and direct drum stablization)


Stage III TH400 has all the features of the Stage II but includes a billet input shaft, and forward hub. Deep cast aluminum pan is standard. 1000+ HP/TQ capable. The Griner Aluminum Transbrake with or without safe neutral is an optional upgrade.

400-3A Automatic Shift $1950
400-3M Forward Pattern Full Manual shift $2000
400-3RM Reverse Pattern Full Manual $2100
400-3RMTB Reverse Pattern with transbrake $2250
400-3ATB Automatic Shift Forward Pattern with transbrake-$2450
400-3G10 Griner G10 $2550
400-3G10B Griner G10B "Band On" $2600
400-3G10 1+2 (1st or 2nd gear launch) $2700 
400-3G15 (Safe neutral VB and aluminum drum standard)- $3300

Aluminum Direct Drum Option for Stage III TH400's.  Add $500
Fully rollerized upgrade add $300. (includes all thrust areas between drums, planetary sets, case, center support, and pump, and direct drum stablization)




Stage 4 TH400 has all the features of the Stage III but includes the 36 element Super Drum and alloy intermediate shaft for more reliability at power levels over 1000 HP.

400-4A Automatic Shift $2850
400-4M Forward Pattern Full Manual shift $2900
400-4RM Reverse Pattern Full Manual $3000
400-4RMTB Reverse Pattern with transbrake $3150
400-4G10 Griner G10 $3500
400-4G10B Griner G10B "Band On" $3550
400-4G10 1+2 (1st or 2nd gear launch) $3600
400-4G15 (Safe neutral and alum drum standard)-$4100

Aluminum Direct Drum with 36 element Super Sprag Drum is optional. Add $400 to  Stage 4 pricing.

Fully rollerized upgrade add $300. (includes all thrust areas between drums, planetary sets, case, center support, and pump, and direct drum stablization)


2.10 gearset add $1800.



Stage 5 TH400 uses a Griner G20 billet Aluminum valve body and eliminates the intermediate sprag. Ultrabell is standard. Great setup for 1500+ HP combos.

400-5 $3600
400-5A Aluminum Drum upgrade $4100
400-5x210  Stage 5 build with 2.10 gearset $5200
400-5Ax210  Stage 5 with Aluminum Drum and 2.10 gearset $5600

Fully rollerized upgrade add $300.

Add $1850 for new Reid Racing Super Hydra 400 case, SuperBell bellhousing, and roller tailhousing to any 400 build.

Offroad and Rockcrawler TH400s

"Rockcrawler 400"
We offer a TH400 setup for Rockcrawler and off-road applications. This is similar to our Stage I build but uses a HD "K" case 4x4 TH400 core with a reverse pattern manual valve body that retains engine braking. 450 HP/TQ capable. $1600. We can upgrade this unit to our other level of builds as necessary for you big power off road guys.


Offroad Stage 2 400
This build is based on our standard Stage 2 build. It starts with a 4x4 core and HD case. We use a reverse manual valve body with engine braking, a wider 1.25" intermediate band for engine braking with HD material. A 34 element sprag, offroad specific clutch materials, lubrication modifications, and torrington bearing upgrades are added. $2000
Upgrades are available for bigger power combos.


Maximum Effort Offroad TH400
This build has all the stops. It is built specifically for the harsh conditions experienced in offroad competition. 
We start with a new Reid Racing case for a bulletproof foundation to prevent stress cracks and case failure common when used in rough terrain and/or with a transfer case attached. We include a Reid Super Bellhousing and a new roller tailhousing (where applicable). The next key ingredient to this package is the spragless design used instead of the typical roller clutch or sprag design used for 2nd gear. This requires the state of the art billet aluminum Griner valve body to control shift timing and includes a direct drum assembly that eliminates the failure prone sprag. An important additional benefit of this design is the extremely strong engine braking ability. Most TH400's with engine braking rely on the OEM design 1" wide band. This does not, it uses the entire 2nd gear clutch pack to give the same capacity and strength to engine braking as it does acceleration. Additionally we use 300M input shaft with larger splines in the forward drum, 300M alloy intermediate shaft, and billet alloy steel forward hub. We add torrington needle bearings in several key locations to deal with friction and thrust loading caused during heavy deceleration.
We make several lubrication improvements, pump modifications, and other improvements to help with lubrication and cooling issues seen in offroad competition. As always, all new clutches, steels, bands, and soft parts. Clutches are specific design that we use for offroad builds. Custom length output shafts and planetary ratios are available. 
6 month warranty. 
Pricing begins at $7100. 



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) available, CSR SuperShields $315 with trans order, custom built Billet Converters from $600
 
2.10 ratio gearsets add $1800 to build price.
2.75 ratio gearet (6 pinion rear planet) adds $1000 to build price.

Electronic speedometer for late model conversions, and other options available.
 
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