TF-904 is light duty and was originally used with Chrysler 4 and 6 cyl engines starting 1960,
some early 273 V8s also got this tranny. Also some mid-size Chryslers with 318's got this tranny.
TF-998 was originally used with Chrysler small V8s (318) and was the original lock up converter tranny.
Note that you can identify a lockup 727 transmission because
it has about 5/8" of the end of the smaller input shaft machined smooth.
If it's a non lock up transmission the splines go to the end of the shaft (except for about a 1/8" bevel).
TF-904 has 3 pinion planetaries and a single wrap rear band.
TF-904 was available in 2 ratios, wide ratio with 4 cylinders, standard ratio with 6 cylinders.
TF-904 was used in all cars behind the 258s, except the Eagle which used the TF-998.
TF-904 uses the same output shaft and seal as the T-4 and T-5.
TF-909 used in Jeeps, is a 904 with a lock-up torque converter.
TF-998 was used behind the 258 only in the Eagle.
TF-998 has a larger front servo, 4 pinion planetaries, and a double wrap rear band.
TF-998 was used in all 304s in cars starting from '72, except some HD applications which got the 727.
TF-999 was originally used with 360 Chryslers, possibly also in later FSJs.
TF-999 is same as TF-998 except for 5 plate front clutch, and a wider front band.
TF-998/9 can be indentified from the TF-904 by the two external ribs on the case above the rear servo.
