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Re: Dana 60 lost backlash, again [Re: dvw] #3096398
11/22/22 08:14 PM
11/22/22 08:14 PM
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Anoka County, MN
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Leigh Offline
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So they weren’t Richmond?

Re: Dana 60 lost backlash, again [Re: Cab_Burge] #3096399
11/22/22 08:19 PM
11/22/22 08:19 PM
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fredericksburg,va
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cudaman1969 Offline
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Back in late 60s early 70s the race engineers at Chrysler said to have as much as .015 in the backlash because the gears would ‘suck’ into each other (zero lash) on a Dana.

Re: Dana 60 lost backlash, again [Re: Cab_Burge] #3096402
11/22/22 08:39 PM
11/22/22 08:39 PM
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MI, usa
dvw Offline OP
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Originally Posted by Cab_Burge
Maybe it is time to upgrade the rear end for one that will live longer with less maintenance, and I am not talking about GM 12 bolt or Ford a nine inch with all after market parts either shruggy


What would you suggest? I'm surprised that a foot brake car kills Dana 60 gears. It very well could be the backlash settings I've been using. For $200 I'll try it and see.
Doug

Re: Dana 60 lost backlash, again [Re: dvw] #3096461
11/23/22 03:44 AM
11/23/22 03:44 AM
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Bend,OR USA
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The only other rear end I have heard of that I would consider using would be one of Mark Williams complete rear ends made for high and faster cars that we don't run yet. work scope
On foot braking I did some testing years ago on leaving at different RPM and found out that car like no flash at all, stalled at max RPM that the converter would take shruggy scope
Same thing on my old S/P car, leaving at WOT against the tranny brake, 5600 to 5800 RPM depending on the track elevation and density altitude hammer
I put a used set of stock 4:56 ratio Dana 60 gears out of a 3/4 ton Dana 60 rear end out of a 1972 Ford 3/4 ton pickup I bought from a junk yard for the housing up I did reset that backlash up right at .006 shruggy
Another thing I just thought of was that car came with a set of Pro 5:86 gears in it with Redline synthetic ultra low friction rear end gear lube, the green stuff, not the red stuff scope up twocents

Last edited by Cab_Burge; 11/23/22 03:50 AM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Dana 60 lost backlash, again [Re: Cab_Burge] #3096466
11/23/22 07:57 AM
11/23/22 07:57 AM
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Posts: 5,762
Hot Rod Ridge
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I have hurt them in as few as 6 passes. I have adjusted the wear pattern set up now and its helped them live but it's something you just keep an eye on.

Re: Dana 60 lost backlash, again [Re: dvw] #3096469
11/23/22 08:27 AM
11/23/22 08:27 AM
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Connellsville
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71Demon528 Online content
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Connellsville
Doug,

I have used 2 sets of US Strange gear 4.30. Both sets broke in 200 passes. Like clock work. The first set broke a few teeth off on the pinion. The second set just heard the clicking while coasting, I parked it, pulled rear end, no teeth were broke or cracked. Seemed like one or two teeth on the pinion were possibly bent because you could feel the bind when turning the driveshaft by hand, then freeing up, however no cracks were found. I went back to Richmond 4.56 gear and am hoping to get more than 200 passes out of them as my original richmond gear had a lot of runs on it. The last I checked, nitro gear still offers a 4.30 pro gear, a little bit more pricey, but they may hold up better. I personally am staying away from the 4.30 gear. From what I gathered about the 4.30 strange US gear, we basically chalked it up to inferior metal.

Re: Dana 60 lost backlash, again [Re: 71Demon528] #3096490
11/23/22 10:07 AM
11/23/22 10:07 AM
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fredericksburg,va
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It comes down to a pro gear or street gear. Street gears are very hard = brittle, pro gears are softer. A friend had a fast Ford with a 9”, keep knocking teeth off the gear, installed a pro gear and lasted two years. 8-3/4s have the same problem. Radials will break an anvil (dead hook)

Re: Dana 60 lost backlash, again [Re: cudaman1969] #3096552
11/23/22 01:19 PM
11/23/22 01:19 PM
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Posts: 1,811
South Bend
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Used to run a 3700 car in modified production that had a 57 to 64 Pontiac 9.3 inch rear axle. It would crack teeth on the pinion gears. Took a new set to a heat treat place and had them soften the gears by three or four numbers and didn't have the problem with the gears cracking any more. Cheap solution. Cost twenty bucks to have them done back in the late 60's early 70's. Probably be about 75 of todays dollars.


July 19th should be "Drive Like Rockford Day". R.I.P. Jimmie.
Re: Dana 60 lost backlash, again [Re: John Brown] #3096555
11/23/22 01:38 PM
11/23/22 01:38 PM
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COLUMBUS, OH
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I told you not to spray off the line!!

Casey FJ

Re: Dana 60 lost backlash, again [Re: Cab_Burge] #3097605
11/27/22 07:01 PM
11/27/22 07:01 PM
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MI, usa
dvw Offline OP
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Examining the new pinion I can see why cracks start in that area. Spent an hour polishing the edges and valleys of the teeth. Will it help? Can't hurt. Ran pinion shims from .40" to .060". All with back lash .010-.013. Lat one looks decent to me with .060"@.011 B/L.
Doug

20221127_113631.jpg20221127_121207.jpg20221127_170607.jpg20221127_170647(0).jpg
Re: Dana 60 lost backlash, again [Re: dvw] #3097622
11/27/22 08:05 PM
11/27/22 08:05 PM
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Fulton County, PA
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Buddy of mine has a stick car that we have worked on over the years. Heavy. Makes the car dead hook and go low 9s @ 1.30ish in 60 with his clutch tune up.

Has progressed over the years from 12 bolt, to Dana, to 9", to good 9" with Pro Stock level parts. Just stepped up to a 9 !/2 set up. Gear life improved dramatically.

His contacts at MW and other places confirm - gear quality has declined over the years.


If the results don't match the theory, change the theory.
Re: Dana 60 lost backlash, again [Re: CMcAllister] #3097724
11/28/22 10:59 AM
11/28/22 10:59 AM
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MN
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Doug, were you able to find another 4.30 Pro Gear? If so, where?

Jeff


69 GTX 68 Road Runner
Re: Dana 60 lost backlash, again [Re: Whompin_Wedge] #3098293
11/30/22 09:26 AM
11/30/22 09:26 AM
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Shelby Twp. Mi
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Originally Posted by Whompin_Wedge
I told you not to spray off the line!!

Casey FJ

I knew it, I KNEW HE WAS SPRAYING!

Re: Dana 60 lost backlash, again [Re: an8sec70cuda] #3098299
11/30/22 09:42 AM
11/30/22 09:42 AM
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Shelby Twp. Mi
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Originally Posted by an8sec70cuda
Originally Posted by n20mstr
Is the housing flexing on launches?? Are the tubes stock? maybe time to brace the housing somehow.

This was my thought also. Seems like every time I've heard of a Dana having problems keeping a gear in it, you end up finding the housing was bent.
Monte Smith warned me about this years ago when I decided to keep my Dana and not change to a 9".

I think this could be happening on the launch. I know Doug is pretty methodical so, a small change in set-up may not change the service life. But I hope it does! A long time ago, I was told about every rear can use help with fore-aft reinforcement. So, i just do it. This is one i made for Randy's Dana with .375 wall axle tubes.

EditRJ100_1294.jpg
Re: Dana 60 lost backlash, again [Re: HardcoreB] #3098324
11/30/22 11:01 AM
11/30/22 11:01 AM
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MI, usa
dvw Offline OP
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I'm sure a brace wouldn't hurt. But if the tubes were moving. I can't see that tightening the B/L. This is what I ended up with.
Doug

20221129_164741.jpg20221129_164830.jpg
Re: Dana 60 lost backlash, again [Re: dvw] #3098396
11/30/22 02:50 PM
11/30/22 02:50 PM
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Rittman Ohio
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Rittman Ohio
Originally Posted by dvw
Examining the new pinion I can see why cracks start in that area. Spent an hour polishing the edges and valleys of the teeth. Will it help? Can't hurt. Ran pinion shims from .40" to .060". All with back lash .010-.013. Lat one looks decent to me with .060"@.011 B/L.
Doug


Looks good Doug. I put a set of those rem polished gears in Fran's Dana and it sure is smooth but it's a lot more difficult to see the pattern during set-up. I'm sure the polish job helps with friction and might also reduce stress risers shruggy

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64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
Re: Dana 60 lost backlash, again [Re: fourgearsavoy] #3098403
11/30/22 03:11 PM
11/30/22 03:11 PM
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Posts: 11,678
W. Kentucky
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Are any of the fast stick cars having these issues?

Re: Dana 60 lost backlash, again [Re: justinp61] #3098410
11/30/22 03:43 PM
11/30/22 03:43 PM
Joined: Dec 2004
Posts: 10,549
Rittman Ohio
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Most of the fast stick cars run some type of slider clutch or a hydraulic device that controls the bite at the hit to keep the shock load away from the hard parts.

Gus beer


64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
Re: Dana 60 lost backlash, again [Re: fourgearsavoy] #3098486
11/30/22 07:31 PM
11/30/22 07:31 PM
Joined: Oct 2003
Posts: 11,678
W. Kentucky
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