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Author Topic: brainiacs  (Read 9987 times)

Offline Bitzer!

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brainiacs
« on: October 26, 2010, 03:09:55 pm »

Hey brainiacs out there!

can anyone tell me how to find the difference between a C20 and a C30? Is there any obvious difference and are differences when ordering parts? ie brake discs (rotors?) etc?

The Vin tag (as discussed 2 1/2 years ago!) bares no resemblance to my truck. Slowly trying to work my way through the got, can make and need to get list!

thanks as always

Bitzer
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1979 GMC CrewCab  C20 1t
454 750 Holley,TH350, 14bolt diff fully floating
Why aren't there 8 days in a week!
A K5 rolling shell *new addition*

Offline Captkaos

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Re: brainiacs
« Reply #1 on: October 26, 2010, 03:36:34 pm »
PN off the frame.
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Offline Bitzer!

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Re: brainiacs
« Reply #2 on: October 26, 2010, 03:42:51 pm »

Cheers Chris,

How did I know it wouldn't be easy!

The chassis & cab will be wheeled into the garage soon, the beds already in the back garden ha ha ha

Could you remind me where I'm looking for the frame number? Under the cab passenger side somewhere?

cheers
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1979 GMC CrewCab  C20 1t
454 750 Holley,TH350, 14bolt diff fully floating
Why aren't there 8 days in a week!
A K5 rolling shell *new addition*

Offline Irish_Alley

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Re: brainiacs
« Reply #3 on: October 26, 2010, 08:40:20 pm »
C30s are about 8" while c20s are about 6"
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

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Offline Bitzer!

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Re: brainiacs
« Reply #4 on: October 27, 2010, 02:24:26 pm »
Quote from: Irish_Alley on October 26, 2010, 08:40:20 pm
C30s are about 8" while c20s are about 6"

what am I measuring??
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1979 GMC CrewCab  C20 1t
454 750 Holley,TH350, 14bolt diff fully floating
Why aren't there 8 days in a week!
A K5 rolling shell *new addition*

Offline ccz145a

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Re: brainiacs
« Reply #5 on: October 27, 2010, 03:36:21 pm »
Quote from: Bitzer! on October 27, 2010, 02:24:26 pm
Quote from: Irish_Alley on October 26, 2010, 08:40:20 pm
C30s are about 8" while c20s are about 6"

what am I measuring??
Frame channel height
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Offline zieg85

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Re: brainiacs
« Reply #6 on: October 27, 2010, 03:43:17 pm »
Quote from: Bitzer! on October 27, 2010, 02:24:26 pm
Quote from: Irish_Alley on October 26, 2010, 08:40:20 pm
C30s are about 8" while c20s are about 6"

what am I measuring??

I just went out 5 minutes ago and compared my 1985 C30 and 1985 C20.  I measures the height of the channel before the gas tank on each truck.  The C-30 is 8 inches tall and the C-20 is 6 1/2 inches tall.
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1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline Bitzer!

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Re: brainiacs
« Reply #7 on: October 27, 2010, 03:48:53 pm »

Cheers guys, I'll have a measure up when it stops raining and can lift the cover. Yup good old UK wet and miserable (and the weather's not much better!)
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1979 GMC CrewCab  C20 1t
454 750 Holley,TH350, 14bolt diff fully floating
Why aren't there 8 days in a week!
A K5 rolling shell *new addition*

Offline Lt.Del

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Re: brainiacs
« Reply #8 on: October 27, 2010, 04:48:38 pm »
You'll have to find a ruler there in the U.K. that is about 40 years old because we measure things in "inches" here.  ;D
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Offline zieg85

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Re: brainiacs
« Reply #9 on: October 27, 2010, 04:54:48 pm »
Quote from: SgtDel on October 27, 2010, 04:48:38 pm
You'll have to find a ruler there in the U.K. that is about 40 years old because we measure things in "inches" here.  ;D

I thought about giving the results in Centimeters.... but I didn't....
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Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline Captkaos

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Re: brainiacs
« Reply #10 on: October 27, 2010, 08:01:12 pm »
generally on the either side ( 2 PNs) and it is usually under the driver/passenger section where it is flat.
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Offline Bitzer!

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Re: brainiacs
« Reply #11 on: October 28, 2010, 02:38:52 pm »
Quote from: SgtDel on October 27, 2010, 04:48:38 pm
You'll have to find a ruler there in the U.K. that is about 40 years old because we measure things in "inches" here.  ;D

I've got a 3" ruler  :-[

Quote from: Captkaos on October 27, 2010, 08:01:12 pm
generally on the either side ( 2 PNs) and it is usually under the driver/passenger section where it is flat.

Ok plucked up the courage for a silly question! (I did warn you!) what does PN stand for?

ta
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1979 GMC CrewCab  C20 1t
454 750 Holley,TH350, 14bolt diff fully floating
Why aren't there 8 days in a week!
A K5 rolling shell *new addition*

Offline Irish_Alley

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Re: brainiacs
« Reply #12 on: October 28, 2010, 10:53:20 pm »
Don't feel bad I don't think I know what PN is lol. The 3 inch will do ok
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Offline Bitzer!

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Re: brainiacs
« Reply #13 on: October 29, 2010, 05:19:50 am »
Quote from: zieg85 on October 27, 2010, 04:54:48 pm
Quote from: SgtDel on October 27, 2010, 04:48:38 pm
You'll have to find a ruler there in the U.K. that is about 40 years old because we measure things in "inches" here.  ;D

I thought about giving the results in Centimeters.... but I didn't....

I guess it's the thought that counts! ;D
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1979 GMC CrewCab  C20 1t
454 750 Holley,TH350, 14bolt diff fully floating
Why aren't there 8 days in a week!
A K5 rolling shell *new addition*

Offline jaredts

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Re: brainiacs
« Reply #14 on: October 29, 2010, 06:15:52 am »
pn=part number
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