I worked on upgrading the heater blower today. It sucks because the heater fan is inside the cab, so the pm102 fan is spinning the wrong direction, but still a huge upgrade in air volume.I unbolted the original panel, unbolted the fan, and enlarged the mounting hole to let the nose of the motor fit through. I used the squirrel cage from a different fan, I'll get some dimensions and part numbers when I take it back apart to seal it.
Heater fan upgrade. I drilled a hole in the box and added a resistor assembly to control fan speed. For those playing the home game, the correct part # for the under-dash fan is PM 113 from Autozone. Counter-clockwise rotation, from an early 90's S-10. I ground the flat spot on the shaft to bring the fan as close to the mounting plate as possible. I still had to shim the mounting plate away from the heater box about 1/8 of an inch. Unbelievable the amount of air this thing pushes! I also added a fan speed resistor for high and low speeds. If I change to a four position switch I could use both coils and have 3 speeds.
Cut and spliced dash to move the glove box to clear roll bar. Still using an old motorcycle battery box mounted on the dash for dry storage. Cell phone, smokes and mp3 player go in there. No radio, but the cord draped over the box goes to the amp mounted under the driver's side seat.
Kinda confused now. The steel top I am restoring for the 74 is definitely a Kelly Steel top, with the indents in the side walls and the forward-angled area above the windshield, like the one in post 13 here http://www.jeepz.com/forum/cj-yj-tj-...steel-cab.html . The other top I have on my 78 is shaped the same, but with no indents (maybe just a production change?). Anyone know?