The Chevy "403" is an aluminum 153 tooth bellhousing with a 4 5/8" center hole.
This makes it compatible with all GM 4 speeds (Muncie,Saginaw,T-10), except 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
My 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 and engineering codes are on the unused clutch fork knock out.
Clutch Fork Hole Side
The example I have 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 spotted "403"s on ebay 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
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
Applications per the 1973-78 Truck Parts Catalog, Effective February,1985
| 73 | G-1,2 (exc.H.D. Clutch) |
Disclaimer:
Factory correct applications are your responsibility.
GM made part and part # changes with no rhyme but a reason (no production interruptions at any cost).
Application charts are for replacement parts that were available at the time of parts book printing.
My observations come from the parts I have in my collection or other reliable sources. Your parts may differ.
If Factory correctness is your goal, do more research, join car clubs and forums and buy an assembly manual if one is available for your Project Car (you wont be sorry).
This is a fun and interesting part of the hobby!
