dana 300 swap!! - Page 3 - JeepForum.com

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post #31 of 74 Old 04-12-2013, 09:26 AM
MisfitSeven
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The problem with the 231/300 is the length of the case once it's all together. I tried a black box-i bolted to a Stak D300, which is just as long as a stock 231. Unless you stretch the rear axle way back, it's too long of a combination especially when used with a TT skid.


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post #32 of 74 Old 04-15-2013, 01:38 AM
cavscout187
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...the 300 to a 231 doubler is within an inch of my stock 231 why would you need to stretch?
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post #33 of 74 Old 04-15-2013, 04:00 AM
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Because having a longer driveshaft is a huge plus when doing a tt as already stated. The 231 was also used in half ton ram pickups and has had a good, long service life it those. Case failure can often be attribute to something else failing and causing the case to fail. Lack of maintenance, high mileage and excessive use contribute to these failures.

Not a fan of the d300 myself. It isn't a very smooth operating t case being it isn't synchronized. And by the time you by a clocking ring, 4:1 kit, 32 spline output and a rebuild kit you are $1300. into it. If you buy the stak flip case, there's another $700. If you double, there's another $500.

Sacrificing smooth operation for a near nonexistent strength issue is a bit silly isn't it. If you have fears of breaking your 231j then throw in a six pinion planetary and a wider chain and gears.
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post #34 of 74 Old 04-15-2013, 04:16 AM
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Ive snapped the chain three times since i did my 5.9 swap twice its been jbs wide chain so there is a strength issue.
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post #35 of 74 Old 04-15-2013, 04:33 AM
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Quote:
Originally Posted by cavscout187 View Post
Ive snapped the chain three times since i did my 5.9 swap twice its been jbs wide chain so there is a strength issue.
There is something wrong with your case ,or bearings, or something else than. I have had a 5.9 for 3 years now with no issue. I'm still running the narrow chain as well.
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post #36 of 74 Old 04-15-2013, 04:53 AM
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Ive got quite a bit done to mine im putting down 516 ft lbs and 435 hp at 3100 I've got intake, rhs heads ported and polished, domed piston's compression at 11, performance tuned through bg Chrysler and twice the chain broke the case so im on my third. 231
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post #37 of 74 Old 04-15-2013, 05:09 AM
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Plus your forgetting a tera low for the 231 is 1200 plus the wide chain is 350... already more and no twin stick and weaker
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post #38 of 74 Old 04-15-2013, 05:38 AM
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Quote:
Originally Posted by cavscout187 View Post
Ive got quite a bit done to mine im putting down 516 ft lbs and 435 hp at 3100 I've got intake, rhs heads ported and polished, domed piston's compression at 11, performance tuned through bg Chrysler and twice the chain broke the case so im on my third. 231
There would be the problem. You aren't running anywhere near a stock 5.9. In this case it does make sense to upgrade to a gear driven case.

Look at the stack flip case. IIRC they fix a lot of issues with flipping vs a stock case. You will still need a donor for internal parts, but it may be your answer.

http://www.stak4x4.com/Dana_300/replace-a-case.htm
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post #39 of 74 Old 04-15-2013, 06:04 AM
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I got a 300 already from an 80
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post #40 of 74 Old 04-15-2013, 06:58 AM
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With that much tq you are really going to want a 32 spline jb conversions output as well.
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post #41 of 74 Old 04-15-2013, 07:27 AM
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Yup actually going with the no novack setup
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post #42 of 74 Old 04-15-2013, 08:03 AM
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Quote:
Originally Posted by cavscout187 View Post
Ive got quite a bit done to mine im putting down 516 ft lbs and 435 hp at 3100 I've got intake, rhs heads ported and polished, domed piston's compression at 11, performance tuned through bg Chrysler and twice the chain broke the case so im on my third. 231
I suspect you'll be not better off with a D300. With those numbers I'd seriously be looking at an Atlas.

Everyone is quick to say the D300 is gear driven therefore it's automatically stronger. I've honestly seen a lot more broken D300 gears on the various forums than busted 231s. Really the only time I've seen a 231 grenade is when the front CV joint seizes up due to improper maintenance.
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post #43 of 74 Old 04-15-2013, 08:43 AM
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Advanced adapters told me he rate them the same. And terra low 4:1 kits suck that's the gears you see tanked.
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post #44 of 74 Old 04-15-2013, 08:52 AM
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Plus I'm going off my buddies cj 7 he has a supercharged ls in there with a lame power robbing auto but it's pretty built and his Dana 300 has held up every time we go out
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post #45 of 74 Old 04-15-2013, 10:24 AM
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My flipped D300 has held up fine for over 6yrs and i'm not easy on the throttle at all...Stock 4.0 tho

2000 TJ Crawler- 5.5 lift w/14in coilovers, HP44, ARB, Cromo's, 300m Joints/D60, Detroit, D80 35spl shafts. Full hydro, OBA, OBW, Flipped D300 W/4:1 kit, custom cage etc.
2001 Cherokee Sport, 4.5 RC Longarm, 33 Duratrac's, SYE, 4:56's, Front HP30 w/Lockrite, Autopals- Sold
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