Let's play.....Name that differential!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Leedogg · 03-24-2011, 10:19 PM

Looks like a Dana 60 by the bolt pattern(using the LMC book)...am I right? If so- a 3.54 is as tall a gear they make?(in LMC anyway)

1989 R3500 dually.

Altec · 03-24-2011, 10:22 PM

Dana 70.

maynardtruckin · 03-24-2011, 10:54 PM

If you look at the webbing that is cast as part of the center section it will tell you what it is. On any Dana they cast the size numbers in the webbing could be top, bottom, or ether side.

Altec · 03-24-2011, 10:56 PM

The 70 is easy to spot by the extra bit of meat below the bottom right area of the diff cover. The 60 doesn't have this.

wyattglock · 03-24-2011, 10:56 PM

Dana 70, check the numbers and it will tell you if it is an HD or a regular.

Leedogg · 03-24-2011, 11:10 PM

I planned to clean it tomorrow(oily- just on the chunck). Thanks for the info. Trying to figure out 1) what gear is in it(rediculously low) and 2)then what gear I want to run...hwy friendly(75-80mph) towing 5000#'s.

pig rig · 03-25-2011, 12:09 AM

my money is its got 4.11 in it

Leedogg · 03-25-2011, 08:17 AM

The speedo it reads ~83 at 70mph. so it isn't the stock gear/rear end...or They messed up the speedo gear...not sure why it is that far off. 83 mph indicated is 3300-ish rpm.

*C-10 simplex* · 03-25-2011, 02:12 PM

Or the rear tire sizes(diameter) may have been changed.

Verify if tire size is stock first to save headache.

GmtGmt · 03-25-2011, 02:29 PM

if its a dually 1Ton its a Dana 70HD

03-24-2011, 10:19 PM	#1
Leedogg Registered User Join Date: Jan 2010 Location: Brewton AL Posts: 236	Let's play.....Name that differential!!! Looks like a Dana 60 by the bolt pattern(using the LMC book)...am I right? If so- a 3.54 is as tall a gear they make?(in LMC anyway) 1989 R3500 dually. Attached Images __________________ 1989 Chevy Crew Cab Dually - 454/400, Trans Am Hauler, Future bagged project. 96 Trans Am: 383/m6 - 11.98@115 on 315 M/T D/R's - 408rwhp 394 rwtq 05 VW Passat TDI - 38mpg @75mph 07 Bandit 1250S - Two wheeled fun! Click here to see my FQuick Garage! Last edited by Leedogg; 03-24-2011 at 10:20 PM.

03-24-2011, 10:22 PM	#2
Altec Getcha Pull Join Date: Nov 2010 Location: MD Posts: 691	Re: Let's play.....Name that differential!!! Dana 70. __________________ '81 K10 454/SM465 '86 S10 Blazer '95 H-D Softail '96 Integra

03-24-2011, 10:54 PM	#3
maynardtruckin Registered User Join Date: Jan 2011 Location: Falcon \ Colorado Posts: 193	Re: Let's play.....Name that differential!!! If you look at the webbing that is cast as part of the center section it will tell you what it is. On any Dana they cast the size numbers in the webbing could be top, bottom, or ether side. __________________ Chris 67 c10 swb build in progress 70 c10 lwb driver pending parts for drastic overhaul 70 c20 lwb parts truck for above mentioned drastic overhaul 71 k20 lwb building for off road use and towing

03-24-2011, 10:56 PM	#4
Altec Getcha Pull Join Date: Nov 2010 Location: MD Posts: 691	Re: Let's play.....Name that differential!!! The 70 is easy to spot by the extra bit of meat below the bottom right area of the diff cover. The 60 doesn't have this. __________________ '81 K10 454/SM465 '86 S10 Blazer '95 H-D Softail '96 Integra

03-24-2011, 10:56 PM	#5
wyattglock Registered User Join Date: Jul 2010 Location: Lafayette, IN Posts: 622	Re: Let's play.....Name that differential!!! Dana 70, check the numbers and it will tell you if it is an HD or a regular.

03-24-2011, 11:10 PM	#6
Leedogg Registered User Join Date: Jan 2010 Location: Brewton AL Posts: 236	Re: Let's play.....Name that differential!!! I planned to clean it tomorrow(oily- just on the chunck). Thanks for the info. Trying to figure out 1) what gear is in it(rediculously low) and 2)then what gear I want to run...hwy friendly(75-80mph) towing 5000#'s. __________________ 1989 Chevy Crew Cab Dually - 454/400, Trans Am Hauler, Future bagged project. 96 Trans Am: 383/m6 - 11.98@115 on 315 M/T D/R's - 408rwhp 394 rwtq 05 VW Passat TDI - 38mpg @75mph 07 Bandit 1250S - Two wheeled fun! Click here to see my FQuick Garage!

03-25-2011, 12:09 AM	#7
pig rig Registered User Join Date: Feb 2009 Location: washington the state Posts: 730	Re: Let's play.....Name that differential!!! my money is its got 4.11 in it __________________ my sports car rolls on six wheels only because I'm to fat to get in and out of new corvette http://hubgarage.s3.amazonaws.com/ph...ped_detail.JPG

03-25-2011, 08:17 AM	#8
Leedogg Registered User Join Date: Jan 2010 Location: Brewton AL Posts: 236	Re: Let's play.....Name that differential!!! The speedo it reads ~83 at 70mph. so it isn't the stock gear/rear end...or They messed up the speedo gear...not sure why it is that far off. 83 mph indicated is 3300-ish rpm. __________________ 1989 Chevy Crew Cab Dually - 454/400, Trans Am Hauler, Future bagged project. 96 Trans Am: 383/m6 - 11.98@115 on 315 M/T D/R's - 408rwhp 394 rwtq 05 VW Passat TDI - 38mpg @75mph 07 Bandit 1250S - Two wheeled fun! Click here to see my FQuick Garage!

03-25-2011, 02:12 PM	#9
C-10 simplex Account Suspended Join Date: Dec 2008 Location: indisclosed Posts: 1,515	Re: Let's play.....Name that differential!!! Or the rear tire sizes(diameter) may have been changed. Verify if tire size is stock first to save headache.

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