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M20 and M21 Gearbox

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Speedo Drive Gear

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- 66 ute
- saplin
- geof66
- freo9121
- Moe Mick

published by Holden Fan (not verified) on Tue, 20/05/2008 - 00:28

What these codes mean:

ENG: (Engine)

L20 - 202.

L31 - 308.

L32 - high compression 253.

L33 - low compression 253.

TRANS: (Transmission)

M15 - Three speed column shift manual, (except 308 & 350).

M20 - Four speed floor shift manual.

M21 - Four speed close ratio floor shift manual.

M22 - Four speed floor shift manual, (wide ratio) (six cyl commercial only).

M40 - Trimatic three speed column or console shift auto.

M41 - Turbo-Hydra-Matic 400 three speed column or console shift auto (308 only). Replaced in May 1979 by Turbo-Hydra-Matic 350.

M38 - Turbo-Hydra-Matic 350.

RRAXLE (Rear Axle / Diff Ratio)

GU4 - 3.08:1.

GU7 - 2.78:1.

GU8 - 3.90:1.

GV2 - 3.36:1 - only applicable to V8 HQ's.

GV4 - 3.36:1.

GV7 - 3.55:1.

G70 - 2.60:1 .

Breakdown of the VIN. (Early HQ only)

Eg: VIN - 80170QH500025.

80170 Q H5 00025

Model number

80170 - 6cyl Panelvan

80270 - 8cyl Panelvan

80180 - 6cyl Ute

80280 - 8cyl Ute Last letter of vehicle model year (HQ) Assembly plant code

H1 - H4 = Brisbane

H5 - H9 = Sydney

J1 - J9 = Dandenong

L1 - L5 = Adelaide

L6 - L9 = Perth Vehicle serial number

Breakdown of the VIN. (Late HQ, HJ-HX-HZ)

Eg: VIN - 8M70RH J598183Z.

8 M 70 R H J5 98183 Z

GMH Designation Model code

M = Commercial

N = Kingswood Body Style

70 = Panelvan 80 = Ute Engine

L = 3.3L

R = 4.2L

T = 5.0L Model Year

D = 1974

E = 1975

F = 1976

G = 1977

H = 1978 Assembly plant code

H1 - H4 = Brisbane

H5 - H9 = Sydney

J1 - J9 = Dandenong

L1 - L5 = Adelaide Vehicle Serial Number Series Code

Q = HQ

J = HJ

X = HX

Z = HZ

Model:

Topic:

## Comments

## WB pannel van

WB 1980 pannel van has 308v8 ,4speed manual,power steer,air/con,GTS dash,GTS steerin wheel,SLE alloy rims,I need info of compliance codes to check with my plate codes please.

## 5.0l conversion

what model can i legaly put a 5.0l or 5.7 i have hz onetonner, hq ute and a hx?

## you can put in a ls1 vt motor

you can put in a ls1 vt motor 308, anything more is more stuffing about. Straight in no need to change the mounts. However, im not 100% sure about the rack steering situation. Im not farmilar with hz's

30ATE

## VT LS1

I think you mean a VT Series 1 motor... a 308 CID LS1 doesn't exist...

Cheers...Dave

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Qute's Shed

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