Band Adjusments for Borg-Warner Automatic Transmissions - Top

           The T-409 automatic transmission is a heavy duty cast iron unit made by Borg-Warner. AMC
           called it a flash-o-matic. The T 39 and T 49 are the same just not as heavy duty in the servo
           and planetary area. This style goes way back to the 50's with IHC T26 T28. They got better
           over the years but were quite heavy and Warner quit making them in 1971 or there
           abouts-- Ford also used this design but used linkage for the kick-down not electrical
          [ Ford Model FMX ]. I think Japan even copied it but shrunk the mold   somewhat. 

           Adjustments 

           Front band setting--Back off adjusting screw and put a .250in spacer between the adjusting
           screw and piston pin and tighten the screw to 10 inch lbs. There should be a one-way clutch
           spring on the adjusting screw that will automatically adjust the front servo. Older units had a
           lock nut. [ Tighten lock nut to 20-25 ftlbs ] 

           Rear band setting---unlock jam nut and back off adjusting screw untill free travel is obtained.
           Tighten adjusting screw to 10 inch lbs--then back off screw 1 and 1/4 turns. Lock jam nut. 


           As far as I know the IH tools [ SE-1908 & SE-1910 ] are just fancy torque wrenches that
           overrun at 10 inch lbs. One [ SE-1910, front ] has a 1/4 in spacer with it. Try looking up the
           adjustments in a trans. book under AMC. They used the same trans called type 12 with 390
           and 401 engines about 1969--1971. Hope this helps. Dana 

           [ Note: the front band adjustment is the same for most BWauto transmissions. The rear band
           adjusment is similar, with the number of turns the screw is backed off differing between the
           IHC, AMC & Ford Applications. Make sure to check the specification for the model that you
           have. The tools called for in the IH shop manual are simply preset torque wrenches. The torque
           setting of 10 inch pounds is the same for all models.] 


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The FMX/Cruise-O-Matic three speed evolved from the 1950’s Ford-O-Matic and was used until 1980 when the
     AOD was introduced. 

jalcott@mwd.dst.ca.us

Type F only/ do NOT use Dexron/Mercon

Ford code "y" for trans in 68-70 Mustang/ last # on VIN plate

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The AOD gear train design was based on the gear train of the FMX/Cruise-O-Matic transmission which (in one form or
another) has been part of Ford's automatic transmission history for decades. This gear train incorporates a compound
(six-pinion) planetary gear unit, utilizing one planetary carrier with a set of short and long pinions, rather than two or three single
planet carriers. This design was probably used because of the minimal changes needed to "add" overdrive to it. In fact, the
FMX, AOD and AOD-E/4R70W are the only modern Ford transmissions which share the compound planetary design
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FILTERS / TRANS KITS
ask for an FMX filter and gasket... but 
specifically, I go to the parts counter and ask for a filter and pan 
gasket for a 1979 Ford... full size, with the FMX transmissionl.  The 
gaskets have usually sealed better, and the filter has a fabric 
covering, rather than the stock screen..... this newer filter does a 
much better job... but you will need to use a tin snips and cut a hole 
on one end of the filter for the return tube to stick into....   just 
make the hole a little smaller than the pipe to insure a tighter fit.
Lew