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Old 06-16-2009, 06:46 AM   #1 (permalink)
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Dana 300 strength

Looking for a little real world experiences with a dana 300 and its strength. What did you break exactly and under what circumstances? Was it an aftermarket or stock part that broke? If aftermarket then who was the manufacturer of the said part? Circumstances means, tire size, vehicle weight, hp, full throttle abuse, or parking lot, maintenance, etc. I want to hear what you personally have had happen not your third cousin twice removed type deal.
Thanks,
Bobby
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Old 06-16-2009, 06:54 AM   #2 (permalink)
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two stock jeep d300 houseings.

case loaded with lomax 4:1 gears and 32 spline outputs.

stock jeep 318 to 46rh. 300 clocked flat.

42's, roughly 4500#'s

heavy foot (we're breaking stock 14 bolt shafts as well)

dunno exactly when the case is breaking but i suspect its durring hard, reverse front burns.


lots of others breaking here as well.
http://pirate4x4.com/forum/showthrea...light=cracking
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Old 06-16-2009, 07:24 AM   #3 (permalink)
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I Terralow gearset and a broken case. I think the chipped gear led to the broken case as there were chunks of gear floating around when I opened it up. The gears chipped when I came off a waterfall backwards and busted the rear axle in 3 pieces. I think the rig weighed about 4000lbs at the time.
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Old 06-16-2009, 07:30 AM   #4 (permalink)
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Other than the case how would you compare the lo max gears in the 300 to an atlas II? Who are breaking the lomax gears in the d300?
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Old 06-16-2009, 07:31 AM   #5 (permalink)
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3,000 lb TJ, 37 stickies Popping up a climb.

Teralow Gearset, Tera Tail Shaft in the D300, Gears stripped and housing cracked. Everything else inside the tcase was fine.
Also the shock load cracked the tranny case. It sounded like a gun shot.

It was a bad day. In defense of the 300. It probably had 130 days of wheeling on it. The 300s seem to hold up better when the axle gears are low and take the majority of the stress.
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Old 06-16-2009, 07:37 AM   #6 (permalink)
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Quote:
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Who are breaking the lomax gears in the d300?
no one that i know of.
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Old 06-16-2009, 07:46 AM   #7 (permalink)
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I keep hearing about tera gears breaking only and not lo max. I'm thinking about upgrading to the stak case if the lo max gears will hold up. Other than strength does the stak 300 provide any other benefits over stock?
Thanks,
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Old 06-16-2009, 07:48 AM   #8 (permalink)
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Tube Chassis, 5.3, Auto, D60's w/4.10s and 37" stickies, 3300 lb

Broke the stock front output doing a front burn in loose dirty(probably previously stressed)

Upgraded to 32 spline outputs front and rear.

Teraflex 4:1 input gear failed (press fit failed and the gear stripped into 2 pieces)

Then on a waterfall like climb sounded like a gun shot, case split, gears all stripped inside. I imagine a gear broke(could of been stock or teraflex) then the broken pieces got sucked through the gearset, fractured the case, and stripped the remaining gears.

Bought an atlas and haven't looked back
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Old 06-16-2009, 08:11 AM   #9 (permalink)
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I have the JB conversions th350 adaptor, 4to1s, 32 outputs and I have now broken two cases. Both were on steep climbs giving it hell. My buggy is 3100 without water and is powered by 4.3l. I did crack one of my 4to1 gears(wasnt when the case broke) and JB conversions were real stand up and it replaced it for me. I am now going to the stak replace a case with all my Jb conversions goodies and not gonna look back.

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Old 06-16-2009, 08:31 AM   #10 (permalink)
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Sounds like most are cracking cases w/4 to 1 gears in them . Has anyone had experience breaking one w/ stock gear sets and deeper gears in the diffs . If so was it the first thing to break ?
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Old 06-16-2009, 08:38 AM   #11 (permalink)
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Quote:
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Sounds like most are cracking cases w/4 to 1 gears in them . Has anyone had experience breaking one w/ stock gear sets and deeper gears in the diffs . If so was it the first thing to break ?
output shafts
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Old 06-16-2009, 09:33 AM   #12 (permalink)
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Sounds like most are cracking cases w/4 to 1 gears in them . Has anyone had experience breaking one w/ stock gear sets and deeper gears in the diffs . If so was it the first thing to break ?
broke two stock output shafts in mine with TerraLo 4:1 gears. So far that's it.

Of course now I've swapped to an Atlas 4 speed
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Old 06-16-2009, 09:34 AM   #13 (permalink)
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x2 on deep axle gears being a big factor.3300# buggy,v-8,bone stock dana 300,7:17 gears with no breakage in 6 years of use,2 of those years in competition.
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Old 06-16-2009, 09:38 AM   #14 (permalink)
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No one has broken a STak D300 case. IMO unless their ase space limitations a STak Mini is a better deal that building up a complete D300..or just get a complete STak D300.

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Old 06-16-2009, 09:49 AM   #15 (permalink)
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Running a stak 300 with lomax gearset. BBC, 60/14B, 44tsls, Heavy right foot. No problems whatsoever.
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Old 06-16-2009, 09:51 AM   #16 (permalink)
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No one has broken a STak D300 case. IMO unless their ase space limitations a STak Mini is a better deal that building up a complete D300..or just get a complete STak D300.

cary
What's the advantage of buying a complete STaK dana 300? I can understand buying the case itself if you've already got all the upgraded internals, but not if you're buying everything new from them.

Wouldn't you be better off buying an Atlas or a normal STaK case? Especially with the packaging issues that a lot of people run into getting the front driveshaft around automatic transmissions when using a dana 300.
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Old 06-16-2009, 10:00 AM   #17 (permalink)
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I broke two stock outputs and 2 stock cluster gears on 4 seperate occasions. 40's/eaton/60(4.11's)/302ford/t-18 full bodied CJ about 4000lbs. couple times popping up a ledge and others not really getting after it. Cases usually break after the gear teeth are floating.

It's cheaper in the long run to go to an aftermarket t-case. I had a stak 3-speed, ok except for the popping out of gear issue, now I run an atlas. I think the stak box with the lomax gears would be the doo-doo, but how much money are you saving over an aftermarket unit?
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Old 06-16-2009, 12:26 PM   #18 (permalink)
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output shafts
Yep.

I blew up the mid gear as well as an output shaft.

God only knows what's next.

http://s244.photobucket.com/albums/g...May09042-1.flv

I suppose you could say i'm a little hard on them too.
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Old 06-16-2009, 12:31 PM   #19 (permalink)
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I already have all the 300 parts, and it is much cheaper even buying everything new and building it yourself. 1900 to my door vs. 2300+ for a mini stak, 400 difference and I don't see that big of an improvement for my personal needs in the mini over the 300. now a monster box is another story but hell its 2800+ Especially if you factor in shipping and taxes.
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Old 06-16-2009, 12:52 PM   #20 (permalink)
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I already have all...300 pieces. They just haven't come apart yet.
Fixed it for ya.
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Old 06-16-2009, 01:04 PM   #21 (permalink)
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For reference Lomax vs. Atlas gear pics.
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Old 06-16-2009, 01:41 PM   #22 (permalink)
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For reference Lomax vs. Atlas gear pics.
They never show a good picture of the width of the atlas vs. lo max gears, just the diameter. The width is where the strength comes from.
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Old 06-16-2009, 03:32 PM   #23 (permalink)
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I wheel a "fair" amount in a ~3K tube car with a fiesty 5.0,built C-6, STOCK GEAR 300,1350 D-lines and 60's with 6.17's, cromo shafts F&R,39" Reds.
I have had ZERO probs with my 300....broken everything around it but so far so good(now I'm doomed)

I break R/P on a regular basis....that seems to be the weak link in my setup.

I will not put a 4:1 gearset in the stock case as planned from day one.My car is too narrow to take an Atlas so I plan on doing the Stack 300 case with 4:1 and 32 spline outputs F&R then TALLER gears in the Diffs to get some strength back
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Old 06-16-2009, 05:22 PM   #24 (permalink)
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So you put lomax gears (which seem pretty beef) in a stak case with heavy duty outputs front and rear and you're done right? How much do you really save over just buying an atlas or a stak...

I had a D300 for a few years with no problems ( 3500lb tube buggy with burnt 350sbc sm465 clutch drops with 5.13s and sticky krawlers) and was thinking about going the same route because i already had the case and adapter. But when you add it all up I ended up with an atlas. Call me crazy but i enjoy having the piece of mind that only 1 or 2 people in the world have blown up an atlas.

Old rig with d300
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Old 06-16-2009, 05:34 PM   #25 (permalink)
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So you put lomax gears (which seem pretty beef) in a stak case with heavy duty outputs front and rear and you're done right? How much do you really save over just buying an atlas or a stak...
No denying, it's cheaper to buy an Atlas or Stak up front. I went the 300 replace-a-case route because I didn't have room for anything bigger without magor chassis mods.

Geo - Judging by the case sizes the gears can't have much of a thickness difference. I didn't measure mine before I installed them so I can't give the width on the Lo-Max but visually they were beef and made the Terra stuff look puny.
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