Dana 60 problem
#2834073
10/17/20 11:05 PM
10/17/20 11:05 PM
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Joined: Jul 2011
Posts: 781 wine country
8urvette
OP
super stock
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OP
super stock
Joined: Jul 2011
Posts: 781
wine country
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I have a dana 60 under a car. it has been shortened and rebuilt.
I put the car in reverse and it tries to move. in neutral it unloads like it should. in drive it rocks forward then nothing. just free revs.
I blocked the wheels and looked under the car with it in drive and a friend on the brakes. the driveshaft was spinning, we rev it the DS spins faster the car won't move.
I pulled the diff cover and had it on the wheels, started the car and put it in gear. the diff is rotating like you expect to see it... except the wheels are not moving.
I pulled the axles and there is a TON of spline engagement. I can barely spin the driveshaft in neutral wheels on the ground and the car off, but i can get it to rotate.
So this means the diff is bad?????
Help
Also- is this a stock differential unit?
Last edited by 8urvette; 10/17/20 11:05 PM.
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Re: Dana 60 problem
[Re: 8urvette]
#2834097
10/18/20 12:58 AM
10/18/20 12:58 AM
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Joined: Aug 2011
Posts: 2,864 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,864
Pattison Texas
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Yes it is broken, take it apart to find out what is broken
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Dana 60 problem
[Re: 8urvette]
#2834099
10/18/20 01:01 AM
10/18/20 01:01 AM
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Joined: Aug 2003
Posts: 43,228 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,228
Bend,OR USA
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Sounds like the posi is missing some plates or it was not assembled correctly That is the good early Dana 60 clutch type posi If you are able to work on it yourself, rebuild the posi, check the current backlash and then remove the posi with the ring gear on it and mark the two halfs of the posi case before taking it apart to inspect it so you can reassemble it with the cases aligned properly. All the stock Dana 60 clutch type posi have two beveled clutch drive plates, the rest are flat I don't remember which way the curved plate install, towards the ring gear or towards the axles tubes Buy or borrow a good 1967 to 1971 B body FSM and use it for your information on that unit and how to repair it properly maybe it is something really stupid like the wrong clutch plates in the posi unit for the axle splines I remember being told years ago to remove the bevel plate and used a straight plate instead to help reducing friction in high gear for a drag race only rear end, the one thing you had to do after backing up was to make the car go forward 5 or 6 inches minimum to reload the friction plates before getting on the throttle hard IHTHs Mark the caps also so they go back on the proper side installed correctly
Last edited by Cab_Burge; 10/18/20 01:02 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Dana 60 problem
[Re: cudaman1969]
#2834188
10/18/20 11:53 AM
10/18/20 11:53 AM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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Is this a fresh job? Or is this something that broke? How do you know there is a ton of axle engagement? Do the axles rotate by hand? Can they be rotated independently of each other?
"use it 'till it breaks, replace as needed"
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Re: Dana 60 problem
[Re: TRENDZ]
#2834190
10/18/20 12:09 PM
10/18/20 12:09 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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Is the housing offset? Is the right axle in the left side of the housing? That would be the only thing that makes sense to me. This would cause the car to “try” to move. That condition would be relying solely on the single side diff clutches to drive the car. The clutches are not enough to drive the car. It needs both axles to engage the side/ spiders. Also of note, the spider pin rides on a ramp that increases clutch application, assuming both axles are loaded against the diff case.
"use it 'till it breaks, replace as needed"
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Re: Dana 60 problem
[Re: TRENDZ]
#2834199
10/18/20 12:26 PM
10/18/20 12:26 PM
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Joined: Jul 2011
Posts: 781 wine country
8urvette
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super stock
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OP
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Posts: 781
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Is this a fresh job? Or is this something that broke? How do you know there is a ton of axle engagement? Do the axles rotate by hand? Can they be rotated independently of each other? I pulled the axels out and can see the oil line on the spline. it is 1 5/8" engagement. This was a "fresh job" almost 15 years ago. it has been sitting. the shop is no longer and the guy moved out of state. he was very reputable chassis builder. Lots of cars running around he built. I'd chalk this up to an mistake. with the wheels on, and off the ground and the trans in neutral the drive shaft will spin both wheels. I won't be able to touch it for a few days, but ill pull it out and part and post up a few more pictures.
Last edited by 8urvette; 10/18/20 12:30 PM.
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Re: Dana 60 problem
[Re: 8urvette]
#2834232
10/18/20 02:17 PM
10/18/20 02:17 PM
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Joined: Nov 2004
Posts: 16,491 On the run…
BloFish
I Live Here
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I Live Here
Joined: Nov 2004
Posts: 16,491
On the run…
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That’s a terrible “mistake”.
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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Re: Dana 60 problem
[Re: AndyF]
#2834323
10/18/20 07:13 PM
10/18/20 07:13 PM
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Joined: Dec 2005
Posts: 11,611 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,611
Fulton County, PA
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Even if it had no clutches in it, it should still move...or am I missing something?
Cover off? Stick the axles in and try to rotate the rear with a bar stuck in the studs. Gotta have the wrong size axles in it or the teeth cleaned off of a spider gear.
If the results don't match the theory, change the theory.
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Re: Dana 60 problem
[Re: CMcAllister]
#2834339
10/18/20 07:56 PM
10/18/20 07:56 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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master
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Posts: 2,540
Milwaukee WI
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The fact that it tries to move, tells me that only one axle is engaged in the side gears. This would allow the clutches to slip enough to seem like it wants to move the car, but not quite be able to. It’s the only explanation that makes sense to me. If the clutches /plates weren’t in there, the cross pin would be flopping around. In the pic, the cross pin is sitting on the ramp as it should. I have to assume that the clutches are there based on that picture.
"use it 'till it breaks, replace as needed"
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Re: Dana 60 problem
[Re: AndyF]
#2834347
10/18/20 08:25 PM
10/18/20 08:25 PM
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Joined: Jan 2003
Posts: 1,908 Nebraska
4406bbl
top fuel
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top fuel
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Nebraska
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My bet is an early suregrip unit with 2 piece side gears and the axle is only in far enough to get the clutch plate, but not the gear that engages the spider/ pinion gears. It happens a lot at chassis shops that do not know danas are offset, they measure the short side and order axles, exact symptoms you describe. Late clutch type diffs had one piece side gears so they could "slide" by with that kinda work. I did a trans for a guy, car would not move on the ground after narrowing the rear, of course blamed the trans, nope, one axle too short, by a bigshot chassis shop.
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Re: Dana 60 problem
[Re: AndyF]
#2834387
10/18/20 10:42 PM
10/18/20 10:42 PM
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Joined: Jul 2011
Posts: 781 wine country
8urvette
OP
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OP
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wine country
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I'm not clear on what would cause a rear end to act like that but it seems to be either broken or else it was put together wrong. Not sure how come it wasn't noticed for the past 15 years. Wasn't the car ever driven after the rear end was worked on? Usually the car has to be moved around the shop or driven on a trailer or something. The car went to the chassis shop, came home and sat in the garage a bare shell for the last 15 years. I decided to get it going for my uncle. All he has to do is pay for parts, im donating all my labor. I loaded it on my trailer with my winch and had 3 guys help me get it into my driveway. this was the first attempt for it to move under its own power.
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Re: Dana 60 problem
[Re: 8urvette]
#2834389
10/18/20 10:47 PM
10/18/20 10:47 PM
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Joined: May 2019
Posts: 713 Lake Villa Il
INTMD8
super stock
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super stock
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Lake Villa Il
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Even with destroyed plates, input in should result in rpm out.
If you have input in as as far as driveshaft speed and nothing out, it's much worse than any diff clutch. Even completely open would result in outside shaft rpm....
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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