Dana 60 Ratios - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

factorystock · 11-29-2015, 03:14 AM

Quote:

Originally Posted by special-K

What ratios was the Dana 60 available in for 67-72? Was 3.73:1? I was under the impression GM offered 3.54,4.11.and 4.56.

Older post, but the question was never fully answered. I was under the same impression on Chevy C 20's, but never thought about GMC 2500's. Just came across this '69 GMC 3/4 ton with 3.73 ratio. SPID says its option JA2. Funny, looked at some GMC sales brochures, there were no mention of the ratios, Chevy sales brochures from the same era list ratios. No wonder why I didn't have the knowledge then.http://www.hemmings.com/classifieds/...0/1760063.html

factorystock · 11-29-2015, 10:05 AM

Next logical question would be if this ratio was a regular option on GMC 3/4 tons with the Dana 60, could this ratio be special ordered on a Chevy 3/4 ton with a Dana 60?

**special-K** · 11-29-2015, 10:51 AM

Interesting find. I'd think yes, in Chevys too.

**68350** · 11-29-2015, 11:19 AM

That is quite an interesting find. First I've ever seen or heard of 3.73s factory optioned in a 67-72 3/4 ton.

**Joesjunk** · 11-29-2015, 10:40 PM

Very interesting thread, I had never seen or heard of a 3:73 ratio in a 3/4 or 1 ton before. But here is a GMC longhorn SPID with it listed.

1972RedNeck · 11-30-2015, 12:43 AM

Quote:

Originally Posted by jocko

just spitballin here - but a few questions:

1) I'm assumin one can't simply slap a 3.54 R&P on a carrier that previously held 4.10s (or 4.56s), correct? - the whole carrier would need to be swapped, yes?

2) Aftermarket was mentioned above - what is the lowest numerical R&P set that will fit on a 4-series carrier, 4.10? Who are some of the aftermarket companies that might carry some of this stuff? Currie? etc.

3) Is there an aftermarket means of making one's 4.10 D60 a 3.73?

If you currently have 4.10's, you can swap in 4.30's,3.92's, 3.73's, and 3.54's on your carrier.

If you have 4.56's, you can run 4.88's, 5.13's, and a fair bit lower.

It is also possible to swap in 3.07's if needed.

**special-K** · 11-30-2015, 10:06 AM

Makes me wonder about any 4wds out there.

1972RedNeck · 12-01-2015, 12:45 PM

Quote:

Originally Posted by special-K

Makes me wonder about any 4wds out there.

I had a '72 K2500 (D60/D44) that had 3.73's. There was no mention of gear ratio on the SPID so it could have been swapped but IDK.

**A1971Blazer** · 12-01-2015, 12:48 PM

Quote:

Originally Posted by special-K

Thanks for confirming that. I know you are book-wise and trust what you say,when it comes to factory specs. I like that motto and have never argued it. My take on it has always been,"Ford has the better idea and GM has the best ideas"

. Did Ford offer 3.54s? That's the best idea if you want tall gears for the hiway and maintain pulling power and that was GM's idea

Don't forget...Ford had Dana to build a high-pinion front Dana 60......that WAS a "better idea"......

Tkmadone · 12-01-2015, 03:37 PM

I've got a 3.54 in my coil spring C20, but since I've recently installed a 2004r I'm looking for a 4.11 but haven't had any luck. Has anyone changed gears? I'm wondering how hard it would be.

**special-K** · 12-02-2015, 09:09 AM

You really shouldn't need to do that. Look a little harder, I am sure you will find someone who would swap. Is yours a factory big block/TH400 truck?

Tkmadone · 12-02-2015, 02:11 PM

Quote:

Originally Posted by special-K

You really shouldn't need to do that. Look a little harder, I am sure you will find someone who would swap. Is yours a factory big block/TH400 truck?

It originally had a 327 T400 combo with the HO52 rear with 4.56 gears. That was too high so I swapped in the dana 60 with the 3.54, which was much better! Then I came across the 2004r and installed that and now the gears are a little too low, about 1600 at 65.

1972RedNeck · 12-03-2015, 12:33 AM

Quote:

Originally Posted by Tkmadone

It originally had a 327 T400 combo with the HO52 rear with 4.56 gears. That was too high so I swapped in the dana 60 with the 3.54, which was much better! Then I came across the 2004r and installed that and now the gears are a little too low, about 1600 at 65.

Swap the HO52 back under?

I consider swapping gears to be easy, but I see many people that are scared of setting up a Dana differential that will advise against it. I don't even have a case spreader and still don't have any trouble.

Tkmadone · 12-03-2015, 02:03 PM

Quote:

Originally Posted by 1972RedNeck

Swap the HO52 back under?

I would but I gave it to a fellow truck owner that needed it for a project.

I think I'll give swapping the gears a try. Worst case is I'll take it to a shop if I'm not confident with it.

11-29-2015, 10:05 AM	#27
factorystock Registered User Join Date: Feb 2007 Location: west coast Posts: 3,353	Re: Dana 60 Ratios Next logical question would be if this ratio was a regular option on GMC 3/4 tons with the Dana 60, could this ratio be special ordered on a Chevy 3/4 ton with a Dana 60?

11-29-2015, 10:51 AM	#28
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	Re: Dana 60 Ratios Interesting find. I'd think yes, in Chevys too. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

11-29-2015, 11:19 AM	#29
68350 Senior Member Join Date: Jan 2002 Location: Williston, ND Posts: 2,999	Re: Dana 60 Ratios That is quite an interesting find. First I've ever seen or heard of 3.73s factory optioned in a 67-72 3/4 ton. __________________ 68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi

11-29-2015, 10:40 PM	#30
Joesjunk Senior Member Join Date: May 2001 Location: Independence MO. Posts: 7,689	Re: Dana 60 Ratios Very interesting thread, I had never seen or heard of a 3:73 ratio in a 3/4 or 1 ton before. But here is a GMC longhorn SPID with it listed. Attached Images __________________ 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

11-30-2015, 10:06 AM	#32
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	Re: Dana 60 Ratios Makes me wonder about any 4wds out there. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

12-01-2015, 03:37 PM	#35
Tkmadone Registered User Join Date: Aug 2009 Location: Simi Valley, CA Posts: 193	Re: Dana 60 Ratios I've got a 3.54 in my coil spring C20, but since I've recently installed a 2004r I'm looking for a 4.11 but haven't had any luck. Has anyone changed gears? I'm wondering how hard it would be.

12-02-2015, 09:09 AM	#36
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	Re: Dana 60 Ratios You really shouldn't need to do that. Look a little harder, I am sure you will find someone who would swap. Is yours a factory big block/TH400 truck? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~



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