Spid Rear End question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Already Gone** · 03-27-2013, 10:58 PM

Can anyone tell me what rear end gears this truck may have. It is an original unmolested truck. I'm thinking 3:73's but hoping for 3:54's

**leddzepp** · 03-27-2013, 11:04 PM

I don't think 3.73 was an option. 3.54 was standard, and 4.10 was an option IIRC on 72 3/4 ton trucks. Since no ratio is listed, I would say you have 3.54s there. I am sure SSTim will chime in and confirm or deny this.
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**Joesjunk** · 03-27-2013, 11:36 PM

It should be an eaton axle with a 4:10 gear. The "no spin" was the "posi" for the eaton
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SS Tim · 03-27-2013, 11:45 PM

Sorry, But from the SPID as presented it looks like 4.10 gears.
A 350(LS9) C20 coil truck would have a 5200 Eaton HO52 rear axle. The truck has HD coils, but not the leafs that would trigger a Dana60. The NoSpin is another confirmation its an Eaton axle.

Nice options.

Here are the 72 C20 and C30 powertrain charts if you want to have them on file.

**Already Gone** · 03-28-2013, 12:04 AM

Thanks for the info guys, its much appreciated. I kinda been wanting a C20 but really don't want 4:10 gears so I guess this truck as nice and original as it is is not for me. Its the one in the link.

http://cgi.ebay.com/ebaymotors/1972-...orcev4exp=true

**Already Gone** · 03-28-2013, 12:07 AM

Quote:

Originally Posted by SS Tim

Sorry, But from the SPID as presented it looks like 4.10 gears.
A 350(LS9) C20 coil truck would have a 5200 Eaton HO52 rear axle. The truck has HD coils, but not the leafs that would trigger a Dana60. The NoSpin is another confirmation its an Eaton axle.

Nice options.

Here are the 72 C20 and C30 powertrain charts if you want to have them on file.

Thanks Tim and looking at the chart I guess I should be looking for a C20 with a Big Block as they have the 3:54 gears from the factory.

SS Tim · 03-28-2013, 12:35 AM

Or putting a big block dana in this truck. It just needs to come out of a coil C20. Might have to work out driveshaft and park brake cable issues some.

03-27-2013, 10:58 PM	#1
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,130	Spid Rear End question Can anyone tell me what rear end gears this truck may have. It is an original unmolested truck. I'm thinking 3:73's but hoping for 3:54's Attached Images __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

03-27-2013, 11:04 PM	#2
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,012	Re: Spid Rear End question I don't think 3.73 was an option. 3.54 was standard, and 4.10 was an option IIRC on 72 3/4 ton trucks. Since no ratio is listed, I would say you have 3.54s there. I am sure SSTim will chime in and confirm or deny this. Posted via Mobile Device __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul

03-27-2013, 11:36 PM	#3
Joesjunk Senior Member Join Date: May 2001 Location: Independence MO. Posts: 7,698	Re: Spid Rear End question It should be an eaton axle with a 4:10 gear. The "no spin" was the "posi" for the eaton Posted via Mobile Device __________________ 72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale

03-27-2013, 11:45 PM	#4
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: Spid Rear End question Sorry, But from the SPID as presented it looks like 4.10 gears. A 350(LS9) C20 coil truck would have a 5200 Eaton HO52 rear axle. The truck has HD coils, but not the leafs that would trigger a Dana60. The NoSpin is another confirmation its an Eaton axle. Nice options. Here are the 72 C20 and C30 powertrain charts if you want to have them on file. Attached Images __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

03-28-2013, 12:04 AM	#5
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,130	Re: Spid Rear End question Thanks for the info guys, its much appreciated. I kinda been wanting a C20 but really don't want 4:10 gears so I guess this truck as nice and original as it is is not for me. Its the one in the link. http://cgi.ebay.com/ebaymotors/1972-...orcev4exp=true __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

03-28-2013, 12:35 AM	#7
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: Spid Rear End question Or putting a big block dana in this truck. It just needs to come out of a coil C20. Might have to work out driveshaft and park brake cable issues some. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban



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