VIN help

[superwade57]

i have a 78 thats pretty much junk. except the axles are supposed to be dana 60 and corporate 14 with 5.xx:1 gears... this is what im told. it is impossible to get under the truck to verify numbers, i would have to dig the truck out from its grave as its very very overgrown into place as its been in its place for 20 years.

is there a way to know what the gears are based on vin or spid if its not specified? heres the info i have

VIN CKR248J149958

SPID
MODEL: CK20903
A28 SLIDING REAR WINDOW
E63 FLEETSIDE BED
G80 LOCKING DIF.
K76 61 AMP DELCOTRON GE
MX1 AUTO TRANS
NL2 AUX FUEL TANK
UO1 ROOF MARKER LIGHTS
VO2 TRANS OIL COOLER
XUE 9.50X16.5 TUBELESS
Z53 GAGES VOLTMETER
71W XRR1 RED CUSTOM VINYL
A01 SOFTRAY GLASS
DG4 EXT. B/EYE MIR (7.5"
F60 H.D. FRONT SPRINGS & HEAVY DUTY POWER BRAKES
LF4 400 4B ENG
NA2 STANDARD EMISSION
UA1 4000 WATT HD DELCO F
U63 AM PUSHBUTTON RADIO
U76 TOWING DEVICE
YUE 9.5X16.5 TUBELESS
Z62 SCOTTSDALE EQUIP
9V1 COLOR COMBINATION BL

I GOT THE BASIC VIN DECODE- 78 CHEVY 3/4TON 400CID MADE IN JANESVILLE. SEEMS LIKE A PRETTY WELL ORDERED TRUCK I JUST WISH I KNEW OR COULD VERIFY THAT THE GEARS ARE THE 5.13 THAT IM TOLD
THANKS A TON!

[Car'n'Guitars]

I'm pretty positive the only way is if it shows on the SPID in the glove box of the truck, or stamped or a tag that is actually on the axles themselves.

[Jonboy]

I can't imagine them being that low from the factory, especially being only a 3/4 ton. I would bet they are 3.73 or 4.11, unless the gears have been changed out. 5.13's are awfully low.

[hatzie]

Originally Posted by Jonboy

I can't imagine them being that low from the factory, especially being only a 3/4 ton. I would bet they are 3.73 or 4.11, unless the gears have been changed out. 5.13's are awfully low.

X2
20903 is a K20. It would have GT4 3.73 or GT5 4.10 gears with a Dana 44HD axle up front. The only CK trucks with 5.xx gears are the 2wd Cab-N-Chassis trucks with the Dana 70 dually and 19" wheels.

If it really has a Dana 60 up front then it could have anything for gears.

Look behind the front wheel. A Dana 44 has ball joints the 60 has king pins. If dirt is over the top of the axles they're likely hurt bad.

[Keith Seymore]

Per the powertrain chart in the GM Heritage Center archives the base axle (and only available axle) for a '78 K20 with the LF4 is a 3.73:1.

Your truck has 3.73's in it, assuming they have not been changed.

K



Link to free downloads of information kits: http://www.gmheritagecenter.com/gm-h...tion-kits.html

[superwade57]

Thanks Keith that's the type of chart I was hoping to see. They may have been changed. Its my dads truck I know its a 350 th400 in it now dad says he remembers it just screaming at road speed And he says 5.13 or 5.38 however he is generally knowledgeable he's also getting forgetful and a 373 scream may seem like. 5.13 20+ years later: ) thanks again they'll be pulled eventually for a.straight. axel convervison on a 93 and ill let you guys know what I come up with then
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