i own an 86 LX (duh). but the drivetrain is 69. i just had my c-4 rebuilt. the stock tranny blew, too much power i guess. total price was 700. i got the 2800 stall converter, reverse manual valvebody, shift kit, kevlar clutches, input shaft, front drum. there is more, just can't remember. anyway, as far as mileage, i didn't see it get any worse with the converter. my car revs high at highway speed with the c-4, i have 3.27 gears, and at 70 i am just below 3000 RPM. but, when the tranny shifts now, the car launches. it is unbelievable. i am veeeeeery happy with my rebuilt ford unit, and didn't have to spend thousands. thopught i would put my two cents in.
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86LX 306 out of a 69. c-4 auto with b&m shift kit. 3.27 gears
1 5/8" flowtech longtubes, 2 1/2" flowmasters, ported polished and shaved edelbrock performer intake
Holley 650 vacuum carb. ported, polished early casting heads.
11:1 compression, accel 300 race wires, stock duraspark ignition, with MSD blaster 2 coil.
12.6 @115 on GTech
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