Casting #3858403 153 Tooth Chevy

The Chevrolet Part 3858403 # Clutch Housing

The Chevy "403" is an aluminum 153 tooth bell

housing with a 4 5/8" center hole.  This makes it

compatible with all GM car 4 speeds (Muncie,Saginaw,T-10),

except the truck SM 465 and the 1963 small bearing

retainer transmissions. According to the 1967-75

Chevrolet Parts Catalog this is the only Clutch housing

listed for the 302 cubic inch engine (69 Z-28 Camaro).

Yet the I.D. number is 3840383.

Front View

This example has the Z Bar stud bosses molded in

on both sides with the drivers side drilled and tapped.

Part # and Engineering Codes

The part number 3858403 and engineering codes

are on the unused clutch fork knock out.

Clutch Fork Hole Side

This example has a z-bar stud boss on drivers and

passenger sides with the drivers side drilled and

taped and a stud in it. I've had "403"s with the stud

boss on the driver's side only.

Starter Side

The above view shows the passenger side Z-bar

stud boss and the straight starter side typical of

153 tooth flywheel Bells.
See Chevy Bellhousings

Inside View

This casting could be used on right or left hand

drive vehicles.

The Chevrolet parts manuals that I have are dated after 1980 and ALL 3858403 part numbers are followed by this notation ( IDENT.  NO. 3840383 ). I was under the impression that the "383" bellhousing was the earlier model. To add to the confusion, the bell 462606 has 383 cast on the clutch fork ball stud boss of some bells.

Applications per the 1967-1975,1976-1981(July 1986) Chevrolet parts catalogs and 1953-1981(Nov.1981) Corvette parts catalog.

0.683 Housing Assy., clutch (ident.No. 3840383) (note 1)
note 1 : Less ball stud

69	Chevy,Chevelle,Camaro w/ reg. fuel(350)
69	Pas.(350 w/ reg. fuel)(exc. Taxi,Police,H.D, clutch)
69	Chevy,Chevelle,Camaro w/ reg. fuel(327)
67-68	Camaro(327)
65-68	Chevelle(327)(exc. H.D. clutch)
64-69	Pass. w/ reg.fuel (327)(exc.Taxi.Police,H.D. clutch)
70-73	All(307)
68	Chevy(307)
68	Chevelle(307)(exc,H.D. clutch)
68	Pass.(307)(exc. Taxi,Police,H.D. clutch)
67-69	All(302)	I.D, #3840383
65-67	Chevelle (283)(exc. H.D. clutch)
64-67	Pass.(283)(exc. Taxi.Police,H.D. clutch)
75	Nova(262)
73-75	All (6 cyl.)
70-72	All (6 cyl.)(exc. Taxi, Police)
69	Chevy, Chevelle, Camaro(230.250)
68	Chevy(6 cyl.)
64-68	Chevelle, Camaro,(6 cyl.)
64-69	Pass. (230.250)( exc. Taxi, Police, H.D. clutch)
69	Pass. (350 w/reg. fuel) (exc.Taxi, Police, H.D. Clutch)
69	Chevy, Chevelle, Camaro w/reg. fuel (350)
76-77	A (250) W/M.T.
76-79	F (250) W/M.T.
77-79	B (250) W/M.T.
78-78	X (250) W/M.T.
80-81	F (229) W/M.T.
64-68	Y (327,396)
66	Y (427) W/SP. H/PER.
67-69	Y (427) W/H.D., AL.CYL. and Case
68-70	All(153)

A= Malibu
B= Fullsize
F= 67-81Camaro, 69-72 Nova
X= Nova
Y= Corvette
Pass.= Fullsize
Chevy= 62-68 Chevy II / Nova

* This catalog can be confusing. All = all cars with that engine available and all vehicles covered by this catalog.

Applications per the Thru 1975 Oldsmobile Parts Catalog

(*1) NOTE : When installing this housing also order one 3729000 stud listed in Group 0.796.

66-74	L6 S.T. (*1)
75	All X S.T.

Applications per the Thru 1975 Buick Parts Catalog

68-71

L-6 Eng. C.T.

Applications per the Thru 1975 Pontiac Parts Catalog

70-74	All 250M
71-72	X/307
75	All 250 3 spd.-M.T.

Applications per the1976-81 Oldsmobile Parts Catalog Effective July,1987

76	ALL(250) W/3 SPD

Applications per the 1973-78 Truck Parts Catalog, Effective February,1985

73	G-1,2 (exc.H.D. Clutch)