GM's 14 bolts. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ziegelsteinfaust · 12-17-2013, 10:29 PM

I have a 74 C20, and I need to get a better gear ratio.

I know the 9.5 14 bolts have 3.42 gears, but how common are they? Or are they still more common with the 4.11's?

Also which trucks would be most likely to have 3.42's at the pick a part.

D13 · 12-18-2013, 07:12 AM

3.42's are the 'standard' 9 1/2 rear. look for light (low GVW) 3/4 tons. Mine is an 81 8200GVW. Remeber, these trucks are old, and a lot of them have had axle swaps - best bet is to check the ratio by pulling the cover or spinning the axle.

Ziegelsteinfaust · 12-19-2013, 01:16 AM

Cool thanks.

What about Suburbans?

1968vetL-71 · 12-19-2013, 08:34 AM

I seen a 14 bolt rear for sale on craigslist in the Huntsville, or Chattanooga ,TN area with 3.21!

*nekkidhillbilly* · 12-19-2013, 11:18 AM

mine was pretty low geared idk what it had though.

russgt · 12-19-2013, 09:07 PM

Quote:

Originally Posted by 1968vetL-71

I seen a 14 bolt rear for sale on craigslist in the Huntsville, or Chattanooga ,TN area with 3.21!

Yep, I have one of those, kinda hard to come by.

Ziegelsteinfaust · 12-19-2013, 11:48 PM

I am in Chino Hills Ca which is a drive to TN.

Also I want the smaller 14 bolt for many reasons, and it is tough enough for what I do.

12-17-2013, 10:29 PM	#1
Ziegelsteinfaust Registered User Join Date: Dec 2012 Location: Temple City Posts: 3,567	GM's 14 bolts. I have a 74 C20, and I need to get a better gear ratio. I know the 9.5 14 bolts have 3.42 gears, but how common are they? Or are they still more common with the 4.11's? Also which trucks would be most likely to have 3.42's at the pick a part.

12-18-2013, 07:12 AM	#2
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: GM's 14 bolts. 3.42's are the 'standard' 9 1/2 rear. look for light (low GVW) 3/4 tons. Mine is an 81 8200GVW. Remeber, these trucks are old, and a lot of them have had axle swaps - best bet is to check the ratio by pulling the cover or spinning the axle. __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

12-19-2013, 01:16 AM	#3
Ziegelsteinfaust Registered User Join Date: Dec 2012 Location: Temple City Posts: 3,567	Re: GM's 14 bolts. Cool thanks. What about Suburbans?

12-19-2013, 08:34 AM	#4
1968vetL-71 Junior Member Join Date: Jun 2004 Location: Murfreesboro, Tn Posts: 1,092	Re: GM's 14 bolts. I seen a 14 bolt rear for sale on craigslist in the Huntsville, or Chattanooga ,TN area with 3.21! __________________ 1969 impala conv 427 #s loaded. dad bought new 1969 "Judge" RA-3, rare warwick blue/white, #'s 1968 vet convertible #s 427/435 tripower (sold) 1968 belair 2door post #s 427/385 1936 ford 5w coupe dads 1st car 1969 camaro ss (17,xxx) miles Wanted: 69-72 suburban project, 69 camaro convertible. also any big block cars. 69-70 gto judge project.

12-19-2013, 11:18 AM	#5
nekkidhillbilly Account Suspended Join Date: Apr 2009 Location: hazard, ky Posts: 1,674	Re: GM's 14 bolts. mine was pretty low geared idk what it had though.

12-19-2013, 11:48 PM	#7
Ziegelsteinfaust Registered User Join Date: Dec 2012 Location: Temple City Posts: 3,567	Re: GM's 14 bolts. I am in Chino Hills Ca which is a drive to TN. Also I want the smaller 14 bolt for many reasons, and it is tough enough for what I do.



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