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Looking to buy 1974 K5

GoAWOL said:
From what I can tell, everything looks original underneath...which should prove interesting to remove. The front springs are actually bent towards the ground, I suspect they are worn out or should they do that? The rear shocks have springs around them and look like they were built in 1974.
Click to expand...

Somebody else mighta mentioned, but yes, the front springs were negative arched from the factory (umm, an upside-down U instead of U-shaped like the rears.) Now, they may also be worn (and if they're original, I'm sure they are) but they are supposed to be bent that way, fwiw.

I'm curious to see the rear shocks with the spring around them, that's new to me. Sounds like an aftermarket help spring, or maybe they're just weird shocks.

-- A
 
Alright fellas...been plugging away at the truck in my spare time. I've stepped back from the rust repair as it is beginning to get colder and I prefer to do that type of work outside. I'm working on servicing the brakes, diffs, hubs, transmission, engine, etc. My question is...what rear axle do I have here? I'm trying to determine if I have a limited slip or not...my guess is no, I do not as there are no springs or plates. The other photo is my tribute to Ryoken's green prep advice...I am listening.

IMAG0551.jpg


Had to buy new drums as the old ones were probably the originals and had exceeded specs. I cleaned them thoroughly and sprayed some zinc chromate on them as a base prior to hitting them with some high temp black.

IMAG0550.jpg
 
I think there is a stamping on the side of the ring gear...but I am not sure...

IMG_3191.jpg
 
Did you find a tag or sticker in the glove box or door jamb that had the VIN code on it?
 
I read that a Limited Slip Differential test is to get both wheels off the ground....turn one wheel in a specific direction...if you have limited slip the other wheel will turn in the same direction....if you don't it will turn in the opposite direction


Admittedly, I know nothing about differentials...I've never been in one...at some point when I change the fluid in mine I will have a closer look at the inside...
 
GoAWOL said:
I ran the VIN through the slosh website...didn't find how that info helped with the axles
Click to expand...

There could be other RPO numbers that indicate what differential should be in there if it hasn't been changed...here are some of the codes

F01 : FRAME, HEAVY DUTY
F16 : RATIO, TRANSAXLE FINAL DRIVE 2.53
F17 : RATIO, TRANSAXLE FINAL DRIVE 2.84
F19 : HEAVY DUTY CROSS SILL
F25 : RATIO, TRANSAXLE FINAL DRIVE 3.32
F29 : RATIO, TRANSAXLE FINAL DRIVE 2.82
F40 : SUSPENSION SYSTEM, FRT, RR, HD, VAR I
F41 : SUSPENSION SYSTEM, FRT, RR, FIRM RIDE, HANDLING
F42 : SUSPENSION SYSTEM, FRT, HD
F44 : CHASSIS, HEAVY DUTY
F45 : CHASSIS, CONTINUOUSLY VARIABLE REAL TIME CAMPING
F47 : AXLE FRONT, 2 73 RATIO
F51 : SHOCK ABSORBERS, FRT & RR, HD
F58 : STASILIZER SHAFT FR, HD
F59 : STABILIZER SHAFT FR,
F60 : SPRING FRONT, HEAVY DUTY
F61 : STABILIZER SHAFT,RR
F62 : RATIO TRANSAXLE FINAL DRIVE 2.39
F66 : SUSPENSION SYSTEM, FRT, AIR BAG & SEATS, HD
F67 : RATIO, TRANSAXLE FINAL DRIVE 3.19
F68 : RATIO, TRANSAXLE FINAL DRIVE 3.45
F72 : SPRING HEAVY DUTY, VAR 2
F73 : DRIVE, ALL WHEEL
F75 : RATIO, TRANSAXLE FINAL DRIVE 3.18
F77 : RATIO, TRANSAXLE FINAL DRIVE 3.73
F79 : RATIO, TRANSAXLE FINAL DRIVE 2.97
F93 : SPRING FRONT, 6000 LB, MULTILEAF
FE0 : SUSPENSION SYSTEM, FRT & RR, ACTIVE
FE1 : SUSPENSION SYSTEM, SOFT RIDE
FE2 : SUSPENSION SYSTEM, RIDE HANDLING
FE3 : SUSPENSION SYSTEM, SPORT
FE5 : SUSPENSION SYSTEM, RIDE l HANDLING ---- DELETE
FE7 : SUSPENSION SYSTEM, FRT & RR HD, VAR 3
FE8 : RADIAL TUNED SUSPENSION
FE9 : CERTIFICATION, EMISSION, FEDERAL
FF4 : ARM, LH, TORSION BAR SPRING ADJ (C)
FF5 : ARM, RH, TORSION BAR SPRING ADJ (D)
FF6 : ARM, LH, TORSION BAR SPRING ADJ (E)
FF7 : ARM, RH, TORSION BAR SPRING ADJ (F)
FG2 : SHOCK ABSORBERS, FRT & RR, FIRM RIDE
FG3 : SHOCK ABSORBERS, FRT & RR, GAS PRELOADED
FK2 : ARM, LH, TORSION BAR SPRING ADJ (A)
FK3 : ARM, RH, TORSION BAR SPRING ADJ (B)
FNT : FENDERS DELETION
FP0 : RATIO, TRANSAXLE FINAL DRIVE 2.55
FP1 : RATIO, TRANSAXLE FINAL DRIVE 2.72
FP2 : RATIO, TRANSAXLE FINAL DRIVE 3.58
FP3 : RATIO, TRANSAXLE FINAL DRIVE 2.73
FP5 : RATIO, TRANSAXLE FINAL DRIVE 2.95
FP6 : RATIO, TRANSAXLE FINAL DRIVE 3.54
FP7 : RATIO, TRANSAXLE FINAL DRIVE 3.73
FP8 : RATIO, TRANSAXLE FINAL DRIVE 3.54
FQ1 : AXLE FRONT, STD RATIO
FQ2 : RATIO, TRANSAXLE FINAL DRIVE 3.48
FQ6 : RATIO, TRANSAXLE FINAL DRIVE 4.12
FQ8 : RATIO, TRANSAXLE FINAL DRIVE 2.96
FQ9 : RATIO, TRANSAXLE FINAL DRIVE 3.21
FR1 : FRONT SPRING, LEFT SIDE
FR2 : FRONT SPRING, RIGHT SIDE
FS3 : SUSPENSION SYSTEM, I-BEAM CONSTRUCTION
FT2 : ARM, LH, TORSION BAR SPRING ADJ (FT2)
FT3 : ARM, RH, TORSION BAR SPRING ADJ (FT3)
FV0 : RATIO, TRANSAXLE FINAL DRIVE 3.67
FV1 : RATIO, TRANSAXLE FINAL DRIVE 3.72
FV3 : RATIO, TRANSAXLE FINAL DRIVE 3.11
FV4 : RATIO, TRANSAXLE FINAL DRIVE 3.71
FVM : AXLE FRONT, F050, 5000 LBS CAPACITY, HYD
FVO : RATIO, TRANSAXLE FINAL DRIVE 3.67
FW1 : MANUAL ELECTRIC CONTROL, RIDE AND HANDLING
FW2 : RATIO, TRANSAXLE FINAL DRIVE 3.06
FW3 : RATIO, TRANSAXLE FINAL DRIVE 4.02
FW4 : RATIO, TRANSAXLE FINAL DRIVE 3.89
FW5 : RATIO, TRANSAXLE FINAL DRIVE 4.10
FW6 : RATIO, TRANSAXLE FINAL DRIVE 3.42
FW7 : RATIO, TRANSAXLE FINAL DRIVE 3.83
FW8 : RATIO, TRANSAXLE FINAL DRIVE 4.28
FW9 : RATIO, TRANSAXLE FINAL DRIVE 3.43
FWI : PLANT CODE FORT WAYNE, IN, USA
FWS : RATIO, TRANSAXLE FINAL DRIVE 4.10
FWX : SPRING FRONT, 5OOO LBS CAPACITY
FX1 : RATIO, TRANSAXLE FINAL DRIVE 3.94
FX2 : RATIO, TRANSAXLE FINAL DRIVE 2.66
FX3 : RIDE AND HANDLING, AUTOMATIC ELECTRONIC CONTROLLED AAA
FX4 : RATIO, TRANSAXLE FINAL DRIVE 3.35
FX8 : RATIO, TRANSAXLE FINAL DRIVE 3.61
FY1 : RATIO, TRANSAXLE FINAL DRIVE 2.36
FY3 : RATIO, TRANSAXLE FINAL DRIVE 3.79
FY5 : RATIO, TRANSAXLE FINAL DRIVE 3 52
G11 : RATIO, TRANSAXLE FINAL DRIVE 2.56
G31 : SPECIAL REAR SPRING
G32 : REAR SPRINGS
G33 : REAR SPRING, LEFT SIDE
G34 : REAR SPRING, RIGHT SIDE
G44 : AXLE REAR 3.07 RATIO
G50 : SPRING REAR, HEAVY DUTY, VAR 1
G51 : SPRING REAR, HEAVY DUTY, VAR 2
G52 : SPRING, RR, 15000 LBS
G5O : SPRING REAR, HEAVY DUTY, VAR 1
G60 : SPRING REAR, AUXILIARY
G66 : LEVEL CONTROL, MAN, AIR
G67 : LEVEL CONTROL, AUTO, AIR
G69 : LEVEL CONTROL, AUTO, AIR, HD
G72 : AXLE REAR, 2.14 RATIO
G74 : HEAVY DUTY SUSPENSION
G75 : AXLE REAR, 3.62 RATIO
G76 : POSITRACTION REAR
G80 : AXLE POSITRACTION, LIMITED SLIP
G81 : POSITRACTION REAR AXLE
G82 : AXLE REAR, 4.56 RATIO
G84 : AXLE REAR, 4.10 RATIO
G86 : AXLE, REAR, LIMITED-SLIP
G87 : RING GEAR, 8.50 INCH
G89 : RING GEAR, 7.50 INCH
G91 : SPECIAL HIGHWAY REAR AXLE RATIO 3.08
G92 : AXLE REAR RATIO, PERFORMANCE
G94 : AXLE REAR, 3.31 RATIO
G95 : AXLE REAR RATIO, ECONOMY
G96 : AXLE REAR, 3.55 RATIO
G97 : AXLE REAR, 2.73 RATIO
GH0 : AXLE REAR, 3.54 RATIO
GH2 : AXLE REAR, 2.29 RATIO
GH3 : AXLE REAR, 2.77 RATIO
GH4 : AXLE REAR, 2.92 RATIO
GK9 : AXLE REAR, 4.63 RATIO
GL3 : AXLE REAR, 6.17 RATIO
GM1 : AXLE REAR, 2.59 RATIO
GM3 : AXLE REAR, 3.45 RATIO
GM8 : AXLE REAR, 2.56 RATIO
GMC : PLANT CODE PONTIAC, MI, USA
GN9 : AXLE REAR, 4.11 RATIO
GQ1 : AXLE, STD RATIO
GS1 : AXLE REAR, 2.73 RATIO
GS3 : AXLE REAR, 3.73 RATIO
GS4 : AXLE REAR, 3.70 RATIO
GS5 : AXLE REAR, 4.11 RATIO
GS6 : AXLE REAR, 4.56 RATIO
GT1 : AXLE REAR, 2.56 RATIO
GT2 : AXLE REAR, 2.29 RATIO
GT4 : AXLE REAR, 3.73 RATIO (DUP WITH 5 X 1)
GT5 : AXLE REAR, 4.10 RATIO (DUP WITH GT8)
GT7 : AXLE REAR, 3.33 RATIO
GT8 : AXLE REAR, 4.10 RATIO (DUP WITH GT5)
GTY : AXLE, WIDE TRACK
GU1 : AXLE REAR, 2.41 RATIO
GU2 : AXLE REAR, 2.73 RATIO
GU4 : AXLE REAR, 3.08 RATIO
GU5 : AXLE REAR, 3.23 RATIO
GU6 : AXLE REAR, 3.42 RATIO
GV1 : AXLE REAR, 2.73 RATIO
GV2 : AXLE REAR, 5.83 RATIO
GV3 : AXLE REAR, 3.08 RATIO
GV4 : AXLE REAR, 3.36 RATIO
GV5 : AXLE REAR, 3.55 RATIO
GV7 : AXLE REAR, 4.11 RATIO
GV8 : AXLE REAR, 2.72 RATIO
GW2 : AXLE REAR, 2.56 RATIO
GW3 : AXLE REAR, 2.56 RATIO
GW4 : AXLE REAR, 3.31 RATIO
GW5 : AXLE REAR, 2.73 RATIO
GW6 : AXLE REAR, 3.27 RATIO
GW8 : AXLE REAR, 4.10 RATIO
GW9 : AXLE REAR, 2.93 RATIO (DUP WITH GU3)
GWL : SPRING, RR, 9000 LBS CAPACITY
GX1 : AXLE REAR, 3.70 RATIO
GX2 : AXLE REAR, 3.07 RATIO
GX3 : RATIO,TRANSAXLE FINAL DRIVE 3.33
GY2 : AXLE REAR, 3.31 RATIO
GYS : RATIO TRANSAXLE FINAL DRIVE 3.65
H01 : AXLE REAR, 3.07 RATIO
H04 : AXLE REAR, 4.11 RATIO, SINGLE SPEED
H05 : AXLE REAR, 3.73 RATIO
H12 : AXLE REAR, 21000 LBS, EATON 21065S, SINGLE SPEED
HA3 : AXLE REAR, 5.29 RATIO, SINGLE SPEED
HC4 : AXLE REAR, 4.56 RATIO
HC7 : AXLE REAR, 5.13 RATIO, 7500 LBS, SINGLE SPEED
HC8 : AXLE REAR, 3.21 RATIO, SINGLE SPEED, TRUCK
HE3 : AXLE REAR, 3.07 RATIO, 3500 LBS, SINGLE SPEED,
HF7 : AXLE REAR, 4.56 RATIO, 10000 LBS, DANA 70, SINGLE
HF8 : AXLE REAR, 4.88 RATIO
HK1 : AXLE REAR, 2.87 RATIO
HK9 : AXLE REAR, 5.86 RATIO 10000 LBS, SINGLE SPEED
HOT : APPEARANCE PACKAGE GMC “HOT TRUCK”
HPR : HEADLAMPS, DUAL, RECTANGULAR
I5J : TRIM COMBINATION, CLOTH, MED SLATE GRAY (J) (91)
I5Q : MOLDING COLOR, MED GRAY MET (91)
IF3 : TRIM, INTERIOR DESIGN
IFD : TRIM, INTERIOR DESIGN
IL2 : TRIM-INTERIOR DESIGN
IL3 : TRIM-INTERIOR DESIGN
ILC : TRIM-INTERIOR DESIGN
ILD : TRIM-INTERIOR DESIGN
IPC : TRIM-INTERIOR DESIGN
 
My sticker says I have the GT4 : AXLE REAR, 3.73 RATIO

I wonder if that is good or bad?

DSC_00030002.JPG
 
3.73 is a good ratio. 3.42's would probably be better for you, buy 3.73's will be just fine.


Martin
 
GoAWOL said:
I'm guessing these codes are separate from the VIN? If so, it will have to wait till tomorrow
Click to expand...

Yes...they are actually listed as "options", and preceded by the number 1
I have no reason to believe that my rear diff has ever been changed...but I guess you never really know till you look...
 
I was hoping someone could visually identify what's there but will definitely take a look at the options tag tomorrow. Thanks for the hint.
 
Chief Brody said:
Yes...they are actually listed as "options", and preceded by the number 1
I have no reason to believe that my rear diff has ever been changed...but I guess you never really know till you look...
Click to expand...

I looked and found the sticker you were referring to. It was in the glove box but a little worn out. The numbers are still readable so I'll reference them against the chart you posted and this website

http://www.rpocodes.com/

 Thanks again.
IMAG0554.jpg

 
Looks like you have gr4 as well. So 3.73 to 1 ratio like chief. Not a bad ratio. Good for 33 inch tires. I've seen a lot worse rust. That interior is gross but can be worked over. At least get a matching color on there. Lol
 
chulisohombre said:
Looks like you have gr4 as well. So 3.73 to 1 ratio like chief. Not a bad ratio. Good for 33 inch tires. I've seen a lot worse rust. That interior is gross but can be worked over. At least get a matching color on there. Lol
Click to expand...

Thanks, I couldn't decipher the G code...that makes sense. The interior will take some serious TLC to get it back into shape. But right now, nothing is as bad as trying to get my rear brakes back together. Whoever the sadistic bastich is who created drum brakes should be shot down like a lame horse.:weapon2: Getting my butt kicked getting them back together. The good news is I'm doing one side at a time so I do have a reference.
 
It gets easier the more you do them. They work well for most situations but I like my disk brakes much better.
 
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