Dana 60 VS Corporate Questions.

[imdarren]

Could you good folks please share some Pro's / Cons of the Dana 60 Rear Ends VS the Corporate rearends?
I'm refering to the ones that came on the 72 3/4 ton 4x4's
Did the 72 even come with a Dana 60 on the 4x4 3/4 ton?
Are the corporate rearends "full floating" rear axles?
In other words . . . Are they a pain in the a$$ to do brake jobs on?

Thanks for the education.

Darren

[CPNE]

Both are fiull floaters. All 3/4 tons ( 2 and 4wd) came with either a dana 60 or an eaton, though I'm not sure what determined this.

All my GMC 4x4's 3/4 tons had dana 60's, all my chevy's 4x4 3/4 tons had corps.

All my leaf spring 2wd 3/4 tons had dana's all coils 3/4 tons had corps.


This is my experience but I know others have had something to contadict this so it's just MY experience.

Dana's are easier to find parts for. Both are plenty strong.

[1969 GMC]

to add on, it seems only dana 60's came behind bb powered 2wd trucks, chev or gmc, and only with 3.54 gears. both axles are full floating, although the eaton ho52 is physically larger, and stronger. part selection is better for the dana, as well as gear selection. but i saw in your other post that this truck is supposed to have a factory detroit locker, that is a big plus. there is a website I have seen that offers rear disc brake conversion kits for both axles.

[CPNE]

to add on, it seems only dana 60's came behind bb powered 2wd trucks, chev or gmc, and only with 3.54 gears.

While it is true that BB 2wd 3/4 ton automatics got the 3:54 rear dana 60, I've seen 60's behind small blocks too. The ratios on these were mostly 4;11 while 4:56 was available too.

[Woody]

What does Full Floater mean?

[Yukon Jack]

Check this link for info on what a full floater is http://www.off-roadweb.com/tech/0112or_axle/

[1969 GMC]

Originally posted by CPNE


While it is true that BB 2wd 3/4 ton automatics got the 3:54 rear dana 60, I've seen 60's behind small blocks too. The ratios on these were mostly 4;11 while 4:56 was available too.

yeah, brainfart. i meant to say only 2wd 3/4 ton bb trucks only got the dana rear, not that they were the only trucks that go it though. just that they didn't get the eaton.

[COBALT]

The 10 bolt GM Corporate axles (HO52 and HO72) came suspended under 3/4 ton coil sprung suspensions and 1 ton leaf sprung suspensions respectively and share a lot of the same parts and characteristics. They're strong as hell, but obsolete. It's becoming harder and harder to find parts for them. They're easily recognizable with their perfectly round salad bowl back cover, and unboltable and droppable 3rd member out the front like the Ford 9".

They sport an Eaton carrier, which is usually why they're mis-named an "Eaton" (which typically sends people with little experience who want to find out about their rear axles on wild goose chases until they finally find out that HO52 or 72 is the term they should be using - ME included). Their housing was made by GM, hence the "GM Corporate" label. Axles and pinion I believe were made by Spicer. They originally came with either the 4-spider peg leg, one-wheel-wonder thing, but while in production saw Eaton Posi and Lockers in the carrier. Some have survived but not many.

Gearing ranged from 4.10 all the way up to 5 something...(I did see one set of 3.73s for this thing, but only one, so I have to speculate that it was either an aftermarket thing that was available a long time ago or a factory/dealership replacement that never saw a lot of distribution).

Now there aren't any spiders available PERIOD unless you can find them used. Detroit lockers can be put in brand new, but they're expensive, and unless you're lucky enough to find an old posi unit in good working order you're SOL on posi. The only gear change you can do is down to 3.90 or 4.10 replacements, and the bearing kits are not only HUGE but expensive as well. Complete rebuilds can get in the $1000-1500 range.

Strong, robust, and almost (I mean this loosely) maintenance free as long as they're well sealed. I've never had my axles out, or rebuilt the brakes (someone else did the honors), but it looks like it wouldn't be too tough. Several bolts on the hubs hold the axle in place, and I don't think there's any clips or anything inside the carrier.

Since I've had mine I've replaced the 4.10s with 3.90s for better highway driving, had a Detroit Locker put in, and had the bearings replaced. I wouldn't do that again - strictly an amature mistake, but now it will last another 30 years, so what the hell...