Group	Effective Serial Number	Engine Serial Number	Model	Engine Model	Date	Description of change	Source	Page	Implied	Notes
31			CJ5		late	new floor pan cover plate w/ oval bubble	1965 Universal Dispatcher Service Manual	269	0
31			CJ6		late	new floor pan cover plate w/ oval bubble	1965 Universal Dispatcher Service Manual	269	0
21,22	13453		CJ2A			Semi floating rear axle from full floating	1965 Universal Dispatcher Service Manual	214	0	lube chart p10 shows serial number 13413
17,18	24196		CJ2A			Drilled passages between transmission and transfer case for oil circulation	1965 Universal Dispatcher	14,184	0
10		50705		L4		Piston head thickness from 3/16 to 1/4"	1965 Universal Dispatcher Service Manual	33	0
10		3J-161344		L4		Hardened exhaust valve seat inserts installed	1965 Universal Dispatcher Service Manual	41	0	also replacement CJ2A engine serial number RJ-297362
10		44417		L4		oil pump type change from planetary gear to internal rotor	1965 Universal Dispatcher Service Manual	43	0
10		3J-166871		L4		timing gear oil jet from .070 to .040"	1965 Universal Dispatcher Service Manual	49	0
10		175403	CJ2A	L4		flywheel timing mark notations changed	1965 Universal Dispatcher Service Manual	51	0
10		130859	CJ3A	L4		timing marks moved to timing gear cover from flywheel	1965 Universal Dispatcher Service Manual	51	0
15	30973	130859	CJ3A	L4		4-1/2" starter motor (larger) floor mount foot starter switch	1965 Universal Dispatcher Service Manual	51,151,155	0
10		130859	CJ3A	L4		wider cylinder block flange (at previous timing hole location)	1965 Universal Dispatcher Service Manual	51	0
10		All	DJ3A	L4		timing marks on timing gear cover	1965 Universal Dispatcher Service Manual	51	0
10		4J-200614		F4		Hardened exhaust valve seat inserts installed	1965 Universal Dispatcher Service Manual	75	0
10				F4		with 4-1/2" starter new flywheel housing, rear eng plate and ring gear required	1965 Universal Dispatcher Service Manual	80	0
10				F4		tapered flywheel attaching bolts replaced with straignt (drill out tapered holes)	1965 Universal Dispatcher Service Manual	82	0
10		4J-250095		F4		timing gear oil jet from .070 to .040"	1965 Universal Dispatcher Service Manual	84	0
12	43965		CJ3B 57348			fuel tank wider, hold-down strap longer	1965 Universal Dispatcher Service Manual	109	0
12	77001		CJ5 57548			fuel tank wider, hold-down strap longer	1965 Universal Dispatcher Service Manual	109	0
12	14359		CJ6 57748			fuel tank wider, hold-down strap longer	1965 Universal Dispatcher Service Manual	109	0
12	77983		CJ5 57548			fuel tank wider, hold-down strap longer	1965 Universal Dispatcher Service Manual	109	0
10						cylinder head change	1949 CJ2A, CJ3A parts	18	0
10		44418				timing gear oil jet added, oil slinger gasket deleted	1949 CJ2A, CJ3	18, 19	0
10		165477				from chain to gear driven camshaft	1949 CJ2A, CJ3	19,25	0	also changed, oil pump (Eaton), timing cover. 1968 revised parts lists the engine number for change as 44418
10		178217				starter crank nut replace with regular nut	1949 CJ2A, CJ3	19,20	0
10		54101				crankshaft front packing replaced with seal	1949 CJ2A, CJ3	20	0
10		190235				crankshaft pulley change	1949 CJ2A, CJ3	20	0
10		89738				connecting rod bolt change from 7/16 to 3/8"	1949 CJ2A, CJ3	21	0
10		89012				shorter valve spring cover bolts	1949 CJ2A, CJ3	23	0
10		163076				oil pump change from Eaton to aluminum body	1949 CJ2A, CJ3	26	0
10		40353				oil filter change to Purolator or un-named filter	1949 CJ2A, CJ3	26	0
10						oil filter change to Fram	1949 CJ2A, CJ3	26	0	no serial number listed
10		57295				oil distribution elbows changed	1949 CJ2A, CJ3	27	0
10		190235				crankshaft pulley change to twin groove	1968 revised parts list		0
10		163076				spring, oil relief plunger	1968 revised parts list		0
10		148680				intake manifold change	1949 CJ2A, CJ3	29	0
10						intake manifold plug and stud changes	1949 CJ2A, CJ3	29	0	no serial number listed
10		200202				Heat control valve (heat riser) spring change	1949 CJ2A, CJ3	29	0
10		164506				engine stay cable attachment hardware change	1949 CJ2A, CJ3	30	0
10		41781	CJ2A			front insulator (motor mount) change	1949 CJ2A, CJ3	30	0
10		44418	CJ2A			front engine plate change	1949 CJ2A, CJ3	31	0
10		49298	CJ2A			rear engine plate change	1949 CJ2A, CJ3	31	0
10			CJ2A, all CJ3A			rear engine plate change	1949 CJ2A, CJ3	31	0	no serial number listed
11	14127					clutch lever and tube assy change	1949 CJ2A, CJ3	33	0
11	179771					clutch pedal assy change	1949 CJ2A, CJ3	33	0
11	141459					clutch control cotter pin eliminated	1949 CJ2A, CJ3A parts	35	0
12	50000					fuel line clip (front floor sill) change	1949 CJ2A, CJ3A parts	36	0
12	69590		CJ2A			Carburetor change, use Novi governor only	1949 CJ2A, CJ3A parts	36,37	0	was King Seeley and Monarch gov. only
12	212111		CJ2A, all CJ3A			Carburetor change Carter 636-SA	1949 CJ2A, CJ3A parts	39	0
12	49697					gasket (for restrictor plate)	1949 CJ2A, CJ3A parts	39	0
12	69590					plug for vacuum control vent	1949 CJ2A, CJ3A parts	39	0
12	45985					Oakes air cleaner	1949 CJ2A, CJ3A parts	39	0
12						Air horn change	1949 CJ2A, CJ3A parts	40	0	no serial number listed
10		164506				engine stay cable lock washer eliminated	1968 revised parts list		0
11	141459					pedal shaft washers eliminated	1968 revised parts list		0
30	193801		CJ2A all CJ3A			trough, drain, hood hinge added	1968 revised parts list		0
13	18639					Exhaust system change	1949 CJ2A, CJ3A parts	46,47	0	rear muffler?
14			CJ3A			change to side mount radiator, rad. hoses change, grille change also	1949 CJ2A, CJ3A parts	48	0	no serial number listed
14	170065		CJ2A			radiator hose connecting tubes eliminated	1949 CJ2A, CJ3A parts	49	0
14	97741		CJ2A			radiator guard change (grille)	1949 CJ2A, CJ3A parts	49	0	park light change?
15	37218					brace, generator change	1949 CJ2A, CJ3A parts	50	0
15	46479		CJ2A			ign coil mounted to engine 46479-50800 and 50901-51184 inclusive	1949 CJ2A, CJ3A parts	52	0
15						spark plug wire set change	1949 CJ2A, CJ3A parts	52	0	no serial number listed
15	178362		CJ2A			horn button cable added	1949 CJ2A, CJ3A parts	52	0
15			CJ2A			clip added	1949 CJ2A, CJ3A parts	53	0	no serial number listed
15			CJ2A			clip deleted	1949 CJ2A, CJ3A parts	53	0	no serial number listed
15	47100		CJ2A			connector change	1949 CJ2A, CJ3A parts	53	0
15	47100		CJ2A			Harness,body wiring, long changed	1949 CJ2A, CJ3A parts	53	0
15	51229		CJ2A			Harness,body wiring, long changed	1949 CJ2A, CJ3A parts	54	0
15	75449		CJ2A			Harness,body wiring, long changed	1949 CJ2A, CJ3A parts	54	0
15	97441		CJ2A			Harness,body wiring, long changed	1949 CJ2A, CJ3A parts	54	0
15	116422		CJ2A			Harness,body wiring, long changed	1949 CJ2A, CJ3A parts	54	0
15	178362		CJ2A			Harness,body wiring, long changed	1949 CJ2A, CJ3A parts	54	0	horn contact brush removed from steering column
15			CJ2A			harness, body wiring, right side change	1949 CJ2A, CJ3A parts	54	0	no serial number listed
15	51229		CJ2A			chassis wiring change	1949 CJ2A, CJ3A parts	54	0
15	75449		CJ2A			chassis wiring change	1949 CJ2A, CJ3A parts	54	0
15	219466		CJ2A			chassis wiring change	1949 CJ2A, CJ3A parts	54	0
15	32434					lamp, highbeam telltale	1949 CJ2A, CJ3A parts	57	0	use after serial no 32433
15	97741					lamp, parking light	1949 CJ2A, CJ3A parts	57	0	use after serial no 97740
15	158111					headlight attachment screw change	1949 CJ2A, CJ3A parts	57	0
15	38688					headlight door changed from black to chrome	1949 CJ2A, CJ3A parts	58	0
15	45681					parking light change	1949 CJ2A, CJ3A parts	58	0	change to chrome door
15	97741					parking light change	1949 CJ2A, CJ3A parts	58	0	change to later grille w/integral light
15	209952					light, tail and stop change door black to chrome	1949 CJ2A, CJ3A parts	59	0	different serial # for black to chrome change???
15	45724					door and lens change black to chrome	1949 CJ2A, CJ3A parts	60	0	different serial # for black to chrome change???
15					1954 start of production	a few Delco-Remy starter and distributors were used	1965 Universal Dispatcher Service Manual	122	0
15		35523	CJ3B			key start, combinded gauges, 12v	1965 Universal Dispatcher Service Manual	126	1	from schematics
15		49249	CJ5			key start, 12v	1965 Universal Dispatcher Service Manual	128	1	from schematics
15		12578	CJ6			key start, 12v	1965 Universal Dispatcher Service Manual	128	1	from schematics
15			CJ5A			alternator	1965 Universal Dispatcher Service Manual	140	0
15			CJ6A			alternator	1965 Universal Dispatcher Service Manual	140	0
15	10253		CJ2A			headlight switch change to CJ3A style	1965 Universal Dispatcher Service Manual	156	0
15			CJ3B			headlight switch change to CJ5 style	1965 Universal Dispatcher Service Manual	156	0
15	178362		CJ2A			brush horn contact on column eliminated	1965 Universal Dispatcher Service Manual	161	0
15			CJ3A			generator change from GDZ 4817 to GDZ 6001	1965 Universal Dispatcher Service Manual	165	0
15			CJ2A			distributor change from IGW-4177-1 to IAD-4008	1965 Universal Dispatcher Service Manual	167	1
15			CJ3A			distributor change from IAD-4008 to IAD-4008-T	1965 Universal Dispatcher Service Manual	167	1
12	77882		CJ5 57548			fuel tank return to narrow w/ short strap	1965 Universal Dispatcher Service Manual	109	0
15						light, tail and stop change	1949 CJ2A, CJ3A parts	59	0	no serial number listed
15	209952					bracket, tail and stop light added part	1949 CJ2A, CJ3A parts	60	0
15	209952					housing, tail and stop change	1949 CJ2A, CJ3A parts	60	0	different serial # for black to chrome change???
15						housing, tail and stop change	1949 CJ2A, CJ3A parts	60	0	no serial number listed
15	116422					light,IP, assy changed	1949 CJ2A, CJ3A parts	60	0
15	116422					wire, lead, IP, assy changed	1949 CJ2A, CJ3A parts	60	0
15	116422					switch, IP light, assy part deleted	1949 CJ2A, CJ3A parts	60	0
15	219466					switch, stop light, assy changed	1949 CJ2A, CJ3A parts	61	0
15	47100					block, junction,  headlight change 2 post to 3 post	1949 CJ2A, CJ3A parts	61	0
15	13909					horn change	1949 CJ2A, CJ3A parts	61	0	2 manufacturers possible after change
15	51229					horn bracket and mount bolt change dash to fender	1949 CJ2A, CJ3A parts	61,62	0
15	191721					horn and bracket changed	1949 CJ2A, CJ3A parts	61	0	3 manufacturers possible after change
15	178361					brush, contact, horn wire deleted	1949 CJ2A, CJ3A parts	62	0
15	67922					reflector change balck to chrome	1949 CJ2A, CJ3A parts	63	0
17	24197					transmission change	1949 CJ2A, CJ3A parts	64	0
17	38222					transmission change to cane shift, and some internal changes	1949 CJ2A, CJ3A parts	64,67,69	0
17	24197					internal transmission parts change	1949 CJ2A, CJ3A parts	67	0
17	67495					plate, lock, idler, rear gasket and countershaft change	1949 CJ2A, CJ3A parts	67,69	0
17	77759					ball change	1949 CJ2A, CJ3A parts	68	0	shift knob change??
17	11826					shift linkage lube fitting change	1949 CJ2A, CJ3A parts	69	0
18	24197					transfer case change	1949 CJ2A, CJ3A parts	69	0
18	67495					transfer case change	1949 CJ2A, CJ3A parts	69	0
18	24197					transfer case idler gear, shaft and bearing change	1949 CJ2A, CJ3A parts	71	0
19	13454					rear prop. Shaft change	1949 CJ2A, CJ3A parts	73	0
20	22973					frt axle steering arms moved from king pin cap to steering knuckle	1949 CJ2A, CJ3A parts	76	0
21,22	13454		CJ2A			rear axle change to semi floating	1949 CJ2A, CJ3A parts	80,81,82	0	model 23 to 41
23	199080					steering bellcrank, bearing and bracket change	1949 CJ2A, CJ3A parts	83,84	0
23	199080					drag link change	1949 CJ2A, CJ3A parts	84	0
23	22973					tie rods length change	1949 CJ2A, CJ3A parts	84	0
23	38222		CJ2A			steering gear change	1949 CJ2A, CJ3A parts	85	0	end of remote shifter
23	178362		CJ2A			steering gear change, housing and internal parts	1949 CJ2A, CJ3A parts	85, 86	0
24	183499