PERFORMANCEHigh Performance TRANSMISSION PartsLINE PRESSURE BOOSTER KIT 4R100-LB1 I n s t r u c t i o n S u p p l e m e n t
Pump Tech
Good Pressure Depends on a Good PumpVerify Pump SpecificationsExcessclearanceequalslowpumpvolumeandpressure.
Check for Wear• Ifgearsareworn,replacewithdirectreplacementSonnaxpumpgearkit36438A.
NOTE: F5 and later casting number has larger volume (1.7 cu. in. ) pump gears and is a preferred upgrade for early units with E9 and F2 (1.5 cu. in. ) pump gears.
.001" to .0022"Check with feeler gauge and straight edge over pump face, or with Plastigauge and bolt complete pump together.
Outer Gear to Pump Body .004" max.
Lobe to Lobe .004" to .006" max.
Pump Housing Flatness .001"
The Prescription for Optimum PressureStrongerpressureregulatorspringsraisepressureequalamountsatidleandmaximumpressure.Manyaftermarket“kit”springsareacompromise,raisingpressuretoomuchatidleandnotenough at maximum pressures (A in graph). Larger boostvalves,ontheotherhand,haveaprogressiveeffectonpressure,changingtherateofpressureincrease(Bingraph).
TheSonnaxlargeratioboostvalvesandstrongerpressureregu-lator springs are designed towork together.This is an idealcombination: smooth engagements and lower load on thepumpatidle,butagreaterincreaseinpressureasthetransmis-sionisworkedharder.
For a more in-depth look at raising line pressure, readThe Prescription for Optimum Pressure in the Sonnax onlinetechnicallibraryatwww.sonnax.com.
Figure 3
Increases in Line PressureStronger Springs vs. Larger Boost Valves
B
B
A
A
OE SpringsA - B -
Key
Aftermarket “Kit” SpringsSonnax Line Pressure Booster Kits
Low EPC/Torque Signal Pressure HighLo
wLi
ne P
ress
ure
Hig
h
Wet air tests can be done from either location for this particular application.
PERFORMANCEHigh Performance TRANSMISSION PartsLINE PRESSURE BOOSTER KIT 4R100-LB1 I n s t r u c t i o n S u p p l e m e n t
Optional Shif t Tech
Looking for even f i rmer shi f ts?Raise Accumulator Pressure During All ShiftsInstallalargerlinemodulatorvalvetoraiseaccumulatorpressureduringallshifts.Mostheavydutyapplicationscangouponesizewithoutgettingtooharsh.BesuretoinspectoriginalsleevebecauseawornsleeveallowsEPCoiltoleak.Sonnaxoffersseverallinepressuremodulatorplungerandsleevekitsfor4R100units:• Kitfor6-cylinderandsmall8-cylinderapplications,.331"Part No. 36948-03K
Accumulator Control Valve Kits36948-13K, 36948-09K
Quicker and Firmer ShiftsInstallSonnaxperformance-ratedaccumulatorspringkit36948-18K.Thisspringkitistunableandrecalibratesaccumulatorpistonsforquickerandfirmer1-2,2-3and3-4shifts.
Selective Increase of Apply Pressure and Shift FeelInstallSonnaxaccumulatorcontrolvalvekit36948-13Kfor1-2and2-3locationsandkit36948-09Kfor3-4location.Theseimprovedvalvesincludespringshimsforselectiveincreaseofapplypressureandshiftfeel.
Sonnax line-to-lube pressure regulator valve36424-04K features a patented, internal line-to-lubepassagewith anti-drainback check valve that allows full-timeflow to the converterandcoolercircuit,yetpreventsdrainback.Thisupgradeisanessentialpartofanyheavydutyrebuild.Nomachiningisrequired.
