D300 upgrades or change case?

Mac5005

Mac5005

Well-Known Member
Joined
Oct 19, 2005
Location
Rocky Mount
I broke the rear output shaft on my dana 300 yesterday and was wondering what brands of HD outputs you guys are running and what you think of them.

I was also thinking of going with a 4 to 1 kit while i've got it torn down. What brands are ya'll running, and what do you think of them as well.

I'm still trying to decide whether i want to dump money into my 300 or...

look at going with a 205 I have instead
or
saving money/selling parts and investing in an Atlas/stak

opinions?

Thanks guys.
 
By the time you buy good out puts and 4:1 gears and twin sticks you will almost have enough to buy an atlas or stak. Jb conversions is good for the broke parts though if you end up going that route. LINK
 
lbyota85 said:
By the time you buy good out puts and 4:1 gears and twin sticks you will almost have enough to buy an atlas or stak. Jb conversions is good for the broke parts though if you end up going that route. LINK
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Alright chuck:fuck-you: I think the jb conversions stuff looks beefy, and that's what will eventually make its way into my 300. I'm pretty sure I remember reading about chip (upnover) breaking a tera 32 spline output and went with the jb kit when he fixed it, although I could be wrong. I also think the jb 4:1 kit looks stout, they even have pics comparing them to atlas gears (for you landon)
 
I broke a Tera 4:1 gear, Early version, and they replaced it. Also broke a STOCK output, and up graded to the JB Rear output. Believe me, much more beefier than stock, both shaft and housing. It has holes already there to put a disk set up on, and it is same length as stock, so no drive shaft mods needed.
I looked at the LoMax 4:1 gears and , well, they just look a lot beefier than my Tera stuff.
Prices( I think are close)

Tera 4:1 kit, $500
JB 32 Spline output(rear)$390
I'd say about the same for the front $390
so even with all that still about half of an Atlas

Oh yeah, add in some for some decent twin shifters.
 
Actually the front 32 spline kit is only $175, so with full 32 spline stuff and lomax gears you'd have about $1100 in it.
 
$1100 isn't that bad considering what i'd have when i'd be finished. I just got done looking at tera and jb and ya'll are right the jb stuff looks better.

Thanks everyone for your input. I still have alot of decisions to make.

I'm still running my ax-15 (i have 2) and i'm tired of rebuilding them twice a year b/c of blown synchros and broken gear hubs ( ripped the splines out of them) mainly because i beat the crap out of them with mid wheeling gear changes. So i'm really thinking of swapping in either a 700r4 I have or a tf 727 i also have.

The 700 has a 205 behind it, but i have another one that I can finally bolt my doubler behind using the input shaft out of a 231C into my 231J crawlbox, but then i would still need the HD stuff for my D300.

or

fix my ax-15's and my d300, sell them and the doubler, and buy an atlas.

I haven't put the doubler in yet b/c i'm going to need a 2 piece front driveshaft and that is mucho dinero from tom woods.

so i need to figure out what tranny i want to go with before spending any money on my 300.

here are the possible combos other than what i'm currently running, let me know what you guys think.

700/300(w/ 4:1 & outputs)
700/231/300(outputs)
700/205
ax-15/atlas
700/atlas
 
By the time you put the LoMax 4:1 gears and the 32-spline output shaft, your 300 will be stronger than an Atlas. That stuff is BEEFY.
 
Pacfanweb said:
By the time you put the LoMax 4:1 gears and the 32-spline output shaft, your 300 will be stronger than an Atlas. That stuff is BEEFY.
Click to expand...


I've seen several 300 cases break. Never seen an atlas case break, and they don't sell atlas replacement cases like they do for 300's. Not saying he needs to buy an atlas, but 300 < atlas.
 
Mac5005 said:
here are the possible combos other than what i'm currently running, let me know what you guys think.
700/300(w/ 4:1 & outputs)
700/231/300(outputs)
700/205
ax-15/atlas
700/atlas
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I'm a manual guy so I'd vote for the ax-15/atlas. I know some people have had probs with the ax-15 but if it's in good shape and rebuilt properly I would think it would hold up fine for your application. This is a quote from the Novak Adapters site, FWIW, "Though not suited for wild V8 power or punishing off-roading, mild V8's and V6's and all around trail use make the AX15 good match. "
 
I would go with the 700R4/Atlas. I prefer an automatic. Arent the 700R4 to D231/300 adapters very pricey?

DK
 
drkelly said:
I would go with the 700R4/Atlas. I prefer an automatic. Arent the 700R4 to D231/300 adapters very pricey?

DK
Click to expand...

some chevys came with a 700r4/241 setup factory, so I wouldn't think that adapter would be too bad with the right case... if you could find it
 
drkelly said:
I would go with the 700R4/Atlas. I prefer an automatic. Arent the 700R4 to D231/300 adapters very pricey?
DK
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One of the 700's I havve came with a 231c behind it. From what I can tell... I can do one of two things.

a) swap my doubler kit (box4rocks) onto a 231c I have, and bolt the 300 to it, or

b) swap the input planetaries from the 231c into the 231j case that the doubler is on now, and bolt it all up. I have a clocking ring that will allow me to bolt the either 231s behind the 700 and clock them accordingly, so the only real problem is the 27 spline count on the 700/231c, vs. the 23 spline count on my 231J and D300

Once again thanks for the help guys. Ive talked to a few people on pirate that have cracked their cases after bolting the doubler in, and ended up selling everything and going with atlas.

build 300 $1100 plus,
or
atlas $2400 but no worries.


JC,

My ax-15s seem to last a while behind the stroker, until I make a few quick gear changes, and that starts to blow the synchros. I have broken some gear hub parts on 2-3 gearshifts while on the power. They seem to hold up for about a year before needing a go-through, but they don't like being behind the stroker. But then again, neither does the D300 output either.


Thanks guys.


One last question,

Those of you (JC) as well as others, Is overall crawl ratio really that benefitial? In other words, is it really worth the extra loot to either get the 4spd atlas, or drop the coin on driveshafts so i can run my doubler, in order to have extra low low gearing? I'm just wondering if it is really that advantageous in the real world, or if web-wheelers over-rate its value.?



Thanks guys.
 
Whatever you go with, doubler or atlas you will like it. Adding the crawl box to my rig was the best thing I ever did. Our rigs are somewhat comparable it sounds like and it made a world of difference in my rig. Gives you alot more options than you have now while still allowing you "get it" on the access roads. I think you'll be happy with either one, just depends what will work best for you.

Side note....I'm running a 1 piece front shaft on mine with zero trouble. It doesn't even hang below my flat skid (HP60). I don't see the need for the $ 2 piece design. I was going to go that route on mine to get it up under the skid but the 1 piece was perfect for me. I'm sure your set up is a bit different though. Good luck!
 
SPOA87YJ said:
Whatever you go with, doubler or atlas you will like it. Adding the crawl box to my rig was the best thing I ever did. Our rigs are somewhat comparable it sounds like and it made a world of difference in my rig. Gives you alot more options than you have now while still allowing you "get it" on the access roads. I think you'll be happy with either one, just depends what will work best for you.

Side note....I'm running a 1 piece front shaft on mine with zero trouble. It doesn't even hang below my flat skid (HP60). I don't see the need for the $ 2 piece design. I was going to go that route on mine to get it up under the skid but the 1 piece was perfect for me. I'm sure your set up is a bit different though. Good luck!
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Yeah ours are alot alike. Kinda cool seeing your build and then what i did to mine. The problem with the front shaft is that I stretched the front w/ XJ springs, its just another 6 inches to the whole deal. I need to get mine out and get the dust off it to see if theres any way I can make a 1 piece work.

If I ever get mine back together we should go wheel sometime.
 
Ahh that makes more sense now. In all honesty I don't see why you couldn't build a 2 piece front and save yourself some money. Carrier bearings are cheap enough, iirc they can be had for around $20? Unless you want the good stuff then they are around $100....or something like that. We built a few 2 piece front shafts for Sam's buggy for cheap when he first got it going. Granted they wouldn't hold the speeds he was looking to achieve but for overall trail riding it did the job. He ended up spending money in the end due to drive flanges and other factors but I'd say you could build yourself one fairly easily on the cheap.

Definitely like to ride, mine is undergoing some changes as well right now but I should be ready soon enough.
 
If you do go with a 300/700r combo, you can get the factory th350 to np208/241 adapter off ebay for about $40, thats what I payed for mine. Jb conversions makes an input shaft that is the correct length to use this adapter also (I have 1 along with their clocking ring, awesome parts!)
 
The built D300 is really only good if you have the old tcase already. I always have to remind people that the Atlas is 4.3:1 versus the Lomax 4:1 in these "built D300 vs. Atlas" debates.
 
picked up a d300 w/ JB HD outputs front and rear, and 4:1 gears in it, as well as two tf999's.

I'mm going to run my ax-15 this weekend for the last time for Mtn City, then its coming out and the 999 is getting worked on and then going in.
 
thanks JC.

I just seriously laughed out loud....

that was good.


I've definitely been putting off work today to work on the jeep, for the single fact that I want to seee what 4:1 gears is all about.
 
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