-REBUILD KITS - 2 separate
premium kits provide all of the parts usually required to assemble the transmission. These kits do not include replacement
parts for warped or warn hard components, washers or selectives. To obtain the full details on these kits, check out
the rebuild kit section of this website.
VALVEBODIES & TRANSBRAKES: Install one of our complete upgraded
and modified valvebodies to obtain the shift quality, increased cooling and lubrication, anit-drainback features, transmission
performance and reliability that your application requires. Available in Restoration, Heavy Duty, High Performance,
Full Manual control and Transbrake Competition levels to suit your needs.
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| billet steel drum & alum. piston |
BILLET ALUMINUM and BILLET STEEL DRUMS For Performance, Reliability
and most importantly Safety, we recommend installing these critical components in any Torqueflite that will
be used in extreme high performance or competition applications. The high gear drum must accelerate from a dead
stop to full speed in first gear, stop completely and instaniously in second gear and back to full speed in high gear.
From a performance point, the light weight of the aluminum drum drastically decreases the inertia weight
that must be started, stopped and re-started improving the overall accelleration performance. The Aluminum Drum reduces
the weight by 3.15 lbs over the stock 904 drum. Increasing the number of billet aluminum components further
lightens the inertia and increases performance.
Both of the Billet Steel and Billet Aluminum Drums feature a 28% larger Billet Aluminum Piston, to provide
greatly increased clamping force and clutch holding capacity.
Either Drum will hold 5 full thickness, clutch plates.
From the all important safety stand point, in low gear, the total torque of the engine being multiplied
by the low gear ratio, is being transfered by the low drum which is being held locked by the sprag clutch. If when under
full torque, it is suddenly unloaded by breaking a "u"joint, driveshaft,rear-end, etc., the high drum is driven 2.2 times
the engine speed at flair up. At even 5000 rpm flash before you get out of it, this drum has turned 11,000 rpm.
The stock cast drum has an explosion point of approx.9000 rpm. If the stock drum explodes,
it destroys the transmission, the body of the car, possibly severely injuring the driver,
track personel, etc. The billet components stay safely intact reducing possible serious consequences.
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| 904 high gear spring kit |
HIGH GEAR RETURN SPRING PACK The only way to make the high gear
clutches live under severe duty is to replace the high gear coiled clutch return spring with the individual spring pack.
The stock single coiled spring collapses by centerfugal forces when the transmission is reved above 6000 rpm in 1st and
2nd gear. This allows the high gear clutches to drag burning them up. The new spring pack features individual
springs that are not effected by rpm.
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MOLYBDENUM BURNISHED REAR SUPPORT The Steel output
shaft is supported in the rear of the case by an aluminum support. This support also provides the carrier for the steel
rear drum. In both cases you have highly loaded steel surfaces supported by aluminum which is required to be constantly
lubricated by a film of trans fluid returning from the cooler. If for any reason the supply of this fluid is temporarily
interupted while the vehicle is in motion, the aluminum will bind and gall on the surfaces of the steel shaft and drum.
This will seize the transmission and lead to further damage.
Attempts have been made to resolve this problem by installing expensive roller bearings between the surfaces.
This however can lead to other problems such as weakening the support (breaking it off on hard accelleration) and losing the
seal between the support and the shaft and drum allowing fluid to leak past and not lubricate the planetaries-burning them
up.
We have greatly reduced the likelyhood of damage from momentary lack of lube by burnishing the aluminum support on
both surfaces with Molybdenum creating a barrier with a 140,000 psi of abrasion resistance. This
support also reduces the power robbing friction experienced with stock support
PRESSURE PLATES One area that needs close attention in the Torqueflite
is that of the pressure plates. Both the forward clutch pack and the high clutch pack pressure plate (located immediately
under the snap ring) are notorious to warping from heat and pressure. They must be checked very closely with a straight
edge or 150 grit emory paper on glass to make sure that they are making contact on their entire surface. Because the
frictions and steels depend on a thin layer of fluid between them, the apply of uneven pressure will squeeze the fluid away
and allow steel to friction contact resulting in clutch slippage and burnup. To obtain long service life
of frictions and maximum performance, we make available new "true" pressure plates.
PUMP ASSEMBLY Another important item is the
pump assembly. This is the heart of the transmission - pumping the lifeblood (the transmission fluid) to all parts of
the transmission. To provide adequate fluid to the clutch packs to hold them closed, charge the converter, lubricate
all bearings and planetaries and keep all components and critical rubber seals cool, the pump must maintain precise clearances, flat
and true surfaces, provide leak free seal at the fluid transfer surfaces, support the converter, input shaft and high clutch
drum. A pump with worn surfaces, pump gears, bushings or warpage between the front rear halves(which is common in the
904) will not produce a quality rebuild and will surely lead to early failure. Every other
part of your body could be in perfect shape, but if your heart quits the other parts will die too.
Our replacement pumps are fully remachined and modified to provide peak performance.
BLUEPRINT KITS The extract the maximum performance
from your vehicle every clearance must be adjusted to obtain the optimum operating specification. To set your clutch
pack and endplay clearances to the specific factor, we have assembled the hard to find components into a blueprint kit that
make this task much simpler.
 REMOTE VENT AND FILTER KIT
For all Chrysler Transmissions
This kit eliminates transmission drips from the vent (located above the neck of the converter, inside the
bellhousing), after hard running or decelleration, high temperature or transbrake use.
The remote air filter, prevents dust and dirt from entering the transmission in dusty, dirty operating conditions.
The remote resevoir holds any fluid emitted during extreme conditions and returns it to the transmission
when normal conditions resume.
It includes a vent plug for the existing vent, a #4AN 90deg. vent adapter fitting, #4 braided steel
line and the aluminum reserve tank with filter. The tank has provisions for roll bar mounting and can also be mounted
by 2 screws to a flat surface.
Several sanctioning associations require the installation of such a venting system.
OTHER COMPONENTS That will add to the performance
and reliability of your 904 Torqueflite are:
4.2:1 KICKDOWN BAND LEVER This lever replaces the 2.9, 3.2, 3.8 ratio units in your
stock unit. It will increase the clamping capacity of the 2nd gear apply band (remember it has to come to a complete
stop), providing an improved 1-2 shift and improve band life.;
REAR DRUMS and BANDS Because the rear drum and rear band are not applied in an upshift
sequence they often don't need replacement. However if they show signs of wear or if you are installing a transbrake,
they should be replaced. We can supply these components.
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