The Rebel
Well-Known Member
Thought I'd pass this info along: http://www.2040-parts.com/ge-4-headlight-system-3-prong-4000-amp-2-prong-4001-vtg-nos-i2311326/
General Electric (50%), Tung-Sol (25%), and Westinghouse (25%) all supplied headlamp bulbs to Chrysler Corporation through the sixties and seventies. Ford used a lot of GE bulbs. AMC did not.
Fluting pattern refers to the grid of ridges in the front glass lens. Wide flutes are 1/4" wide and narrow flutes are 1/8" wide. See the next to last pic above for a side-by-side comparison. Narrow flute bulbs have some wide flutes, but wide flute bulbs have NO narrow flutes.
The 4000 was introduced by the industry on 12/29/1969 and the 4002 was phased out by the end of 1973. The 4000 is brighter than the 4002 it replaces, hence GE's "Plus 25" designation. Only the very early "Plus 25" bulbs like these had wide flutes and were identical to the old 4002 except for the ink stamp on the back (which doesn't show once installed) and the brighter filament. Most of the 4000 bulbs produced were narrow flute versions. Almost all of the GE 4000 and 4001 bulbs packaged in the common blue and yellow boxes (like the last pic above of a 4001 box) have narrow flutes.
If the box says "Also replaces 5001" it's narrow flute.
If the box is yellow (Westinghouse, Philips, GE) it's narrow flute.
During the 1961 model year, GE, as well as Tung-Sol, made noticeable appearance changes in their headlamps. Your 1961 model Chrysler product could have been delivered with either the earlier style or the style for sale here.
General Electric (50%), Tung-Sol (25%), and Westinghouse (25%) all supplied headlamp bulbs to Chrysler Corporation through the sixties and seventies. Ford used a lot of GE bulbs. AMC did not.
Fluting pattern refers to the grid of ridges in the front glass lens. Wide flutes are 1/4" wide and narrow flutes are 1/8" wide. See the next to last pic above for a side-by-side comparison. Narrow flute bulbs have some wide flutes, but wide flute bulbs have NO narrow flutes.
The 4000 was introduced by the industry on 12/29/1969 and the 4002 was phased out by the end of 1973. The 4000 is brighter than the 4002 it replaces, hence GE's "Plus 25" designation. Only the very early "Plus 25" bulbs like these had wide flutes and were identical to the old 4002 except for the ink stamp on the back (which doesn't show once installed) and the brighter filament. Most of the 4000 bulbs produced were narrow flute versions. Almost all of the GE 4000 and 4001 bulbs packaged in the common blue and yellow boxes (like the last pic above of a 4001 box) have narrow flutes.
If the box says "Also replaces 5001" it's narrow flute.
If the box is yellow (Westinghouse, Philips, GE) it's narrow flute.
During the 1961 model year, GE, as well as Tung-Sol, made noticeable appearance changes in their headlamps. Your 1961 model Chrysler product could have been delivered with either the earlier style or the style for sale here.
