The 1947 - Present Chevrolet & GMC Truck Message Board Network

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The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)

- The 1967 - 1972 Chevrolet & GMC Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=3)

- - Dana 60 Ratios (https://67-72chevytrucks.com/vboard/showthread.php?t=524360)

factorystock

11-29-2015 03:14 AM

Re: Dana 60 Ratios

Quote:

Originally Posted by special-K (Post 5377718)

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

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?

special-K

11-29-2015 10:51 AM

Re: Dana 60 Ratios

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

68350

11-29-2015 11:19 AM

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.

Joesjunk

11-29-2015 10:40 PM

Re: Dana 60 Ratios

1 Attachment(s)

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

Re: Dana 60 Ratios

Quote:

Originally Posted by jocko (Post 5682667)

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

Re: Dana 60 Ratios

Makes me wonder about any 4wds out there.

1972RedNeck

12-01-2015 12:45 PM

Re: Dana 60 Ratios

Quote:

Originally Posted by special-K (Post 7393559)

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

Re: Dana 60 Ratios

Quote:

Originally Posted by special-K (Post 5378130)

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" :lol:. 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 :cool:

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

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.

special-K

12-02-2015 09:09 AM

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?

Tkmadone

12-02-2015 02:11 PM

Re: Dana 60 Ratios

Quote:

Originally Posted by special-K (Post 7396015)

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

Re: Dana 60 Ratios

Quote:

Originally Posted by Tkmadone (Post 7396275)

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

Re: Dana 60 Ratios

Quote:

Originally Posted by 1972RedNeck (Post 7396944)

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.

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