1968 AMA Specifications – Drive Units

AMA Specifications-Passenger Car
— Drive Units —

 

6 – Cyl. Engines

V – 8 Engines

Drive Units – Clutch (Manual Transmission)

Make and Type

Own-Dry

Type pressure plate springs

Disc Spring

Total spring load (lb.)

2050 (b)

No. of clutch driven discs

One

Clutch facing

Material

Woven Molded Asbestos

Outside and inside dia.

10.0 x 6.0 (c)

10.4 x 6.5

Total eff. area (sq.in.)

82.93 (c)

85.56

Thickness

0.135 (c)

0.140

Engagement cushion-ing method

Driven Plate Waved Spoke Springs

Release bearing

Type and method of lubrication

Ball Thrust – Prepacked and Sealed

Torsional damping

Methods: springs,friction material

Coil Springs and Metal to Metal Friction

NOTES

(b) 2350# pressure on Firebird Sprint and Firebird 400.

(c) Firebird Sprint uses 10.4 x 6.5 driven plate with 80.56 effective area and 0.140 facing thickness.

MODEL

Firebird

Firebird Sprint

Firebird 350

Firebird H.O.

Firebird 400

Drive Units – Transmissions

Manual 3-speed (std. or opt.)

Standard

Manual 4-speed (std. or opt.)

Optional

Manual with overdrive (std. or opt.)

Not Offered

Automatic (std. or opt.)

Optional

Drive Units – Manual Transmissions

Number of forward speeds

3-speed

4-speed

6-Cyl. (a)

350 V-8 (b)

All V-8 (c)

6 Cyl.

All V-8 (d)

Transmis-sion ratios

In first

2.85:1

2.54:1

2.42:1

2.85:1

2.52:1

In second

1.68:1

1.50:1

1.61:1

2.02:1

1.88:1

In third

1.00:1

1.00:1

1.00:1

1.35:1

1.46:1

In fourth

—

—

—

1.00:1

1.00:1

In reverse

2.95:1

2.63:1

2.33:1

2.85:1

2.59:1

Synchronous meshing, specify gears

All Forward

Shift lever location

(a)

(b)

Floor Shift

Lubricant

Capacity (pt.)

3.5

2.8

3.5

2.5

Type recommended

Type A – Extreme Pressure

SAE vis-cositynumber

Summer

80 or 90

Winter

80 or 90

Extreme Cold

80 or 90
NOTES

(a) Column shift standard – floor shift optional (standard on Firebird Sprint).

(b) Available with standard column shift only.

(c) Standard on 400 cu. in. V-8 includes floor shift – optional on 350 cu.in. V-8.

(d) Special order close ratio transmission (2.20:1, 1.64:1, 1.28:1, 1.00:1 and 2.27:1R) available with 3.9:1 rear axle ratio on firebird 400 only.

MODEL

Firebird with 250 and 350 cu.in. Engine

Firebird with 400 cu.in. Engine

Drive Units – Automatic Transmission

Trade name

Automatic

Turbo Hydra-Matic

Type describe

Torque Converter

Selector location

Steering column (c)

List gear ratios Selector Pattern and indicate which are used in each selector position

R

D

L

1.76

1.76

1.76 (a)

1.00

R

D

S

L

2.08

2.48

2.48

2.48 (b)

1.48

1.48

1.00

6 Cyl. Engines

V-8 Engines

400 cu. in. V-8 Engines

Max. upshift speed-drive range

80 mph

73 mph

78 mph

Max. kickdown speed-drive range

75 mph

68 mph

3-2 @ 70, 3-1 @ 29 mph

Torqueconvertor

Number of elements

Three

Max. ratio at stall

2.8:1

2.5:1

2.3:1

Type of cooling (air, liquid)

Water

Nominal diameter

11.75

12.5

Lubricant

Capacity-refill (pt.)

15 (Approx.)

19 (Approx.)

Type recommended

GM Dexron Automatic Transmission Fluid

Special transmissionfeatures

Shift lever must be lifted over stop to enter ¨Park¨, ¨Reverse¨, and ¨Low¨ (¨S¨ on 400) positions. Engine starting on ¨Neutral¨ and ¨Park¨ positions provided for.
NOTES

(a) Total transmission torque multiplication in first gear is 4.93:1 with 6 cyl. and 350 HO engine, 4.44:1 with 350 cu.in. 2 bbl. carburetor engine.

(b) Total transmission torque multiplication in first gear is 5.7:1

(c) Floor – with optional console

Drive Units – Propeller Shaft

Number used

One

Type (straight tube, tube-in-tube,internal-external damper, etc.)

Straight Tube

Outer diam. x length* x wall thick-ness

Manual 3-speed trans.

2.75 x 49.96 x 0.065

Manual 4-speed trans.

2.75 x 49.96 x 0.065

Overdrive transmission

Not Available

Automatic transmission

2.75 x 49.96 x 0.065

2.75 x 49.30 x 0.065

Inter-mediatebearing

Type (plain,anti-friction)

Not Used

Lubrication (fitting,prepack)

Not Used

SlipYoke

Type

Splined

Number of teeth

27

Spline O.D.

1.175

Universal joints

Make and Mfg. No.

Saginaw – Size 44 (Regular)

Number used

Two

Type (ball and trunnion, cross)

Cross

Rear attach.(u-bolt, clamp, etc.)

U-Bolt

Bearing Type

Anti – Friction

Bearing Lubric.

Prepacked

Drive taken through (torque tubeor arms, springs)

Springs

Torque taken through (torque tubeor arms, springs)

Springs

NOTES

* Center to center of universal joints, or to centerline of rear attachment.

MODEL

Firebird

Firebird Sprint

Firebird 350

Firebird H.O.

Firebird 400

Drive Units – Axle

Type (front, rear)

Rear

Description

Semi-Floating Hypoid

Limited Slip differential, type

Spring Loaded Clutch (Opt.)

Drive Pinion Offset

1.50

No. of differential pinions

2

Pinion adjustment (shim, other)

Shim

Pinion bearing and. (shim, other)

Collapsible Spacer

Wheel bearing type

Single Row Ball Bearing

Lubricant

Capacity (pt.)

3

Type recommended

A-9 Hypoid (a)

SAE vis-cositynumber

Summer

80-90

Winter

80-90

Extreme cold

80-90

NOTES

(a) Special lubricant required with limited slip differential.

Axle Ratio Tooth Combinations (See Power Teams for axle ratio usage)

Axle ratio

2.41:1

2.56:1

2.78:1

2.93:1

3.08:1

3.23:1

3.36:1

3.55:1

3.90:1

No. of teeth

Pinion

17

16

14

14

13

13

11

11

10

Ring gear

41

41

39

41

40

42

37

39

39

Ring gear O.D.

8.125

MODEL

Firebird

Firebird Sprint

Firebird 350

Firebird H.O.

Firebird 400

Drive Units – Wheels

Type & Material

Disc – Steel

Rim (size & flange type)

Std.

14 X 6 (a)

Opt.

None

Attachment

Type (bolt or stud)

Bolt

Circle diameter

4.75

Number and size

5, 7/16 – 20

NOTES

(a) On four road wheels – std. Space Saver Spare tire is on 14 x 5 rim wheel.

Drive Units – Tires

Standard

Size, ply rating, & ply

E70 x 14 (b)

F70 x 14 (b)

Type (bias, radial, etc.)

Bias

Full rated Inflation Press.

Front

24 (Full Load) – 24 (Reduced Load)

Rear

28 (Full Load) – 24 (Reduced Load)

Rev. Mile at 50 mph

807

790

Optional

Size, ply rating, & ply

F70 x 14 (b)

 

195 R x 14 Radial, 2 Ply Carcass – 4 Ply Tread, Type

NOTES

(b) 2 Ply – 4 Ply rated. Std. spare tire size is 7.35 x 14 – space saver type.

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