Ford 9" from a 76 half ton - Page 4 - JeepForum.com

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post #46 of 82 Old 07-14-2010, 08:16 AM
DBLJ
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Originally Posted by Apex View Post
Ok, my brain is getting fried...here are my pre-bedtime questions.

Will the stock 3rd member work with 35 spline shafts? Or do I need something like a currie/moser/strange 3rd? (I think I know the answer, but I've read so much stuff I'm going into overload)

What would be the largest tire you would run on the 31 spline axles? (I may just regear it to 4.11 and run it stock until I can offload the super35 and d30 and buy a big bearing 3rd member and 35 spline ARB and shafts)
If you run your 35's on the stock 9" with 31spline shafts, its going to laugh at you and ask for more. Add in alloy shafts and your built for big tires. Add 35 spline shafts and your in the big leagues. Your still thinking in terms of dana 35's and 44's.

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post #47 of 82 Old 07-14-2010, 09:30 AM Thread Starter
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Originally Posted by DBLJ View Post
If you run your 35's on the stock 9" with 31spline shafts, its going to laugh at you and ask for more. Add in alloy shafts and your built for big tires. Add 35 spline shafts and your in the big leagues. Your still thinking in terms of dana 35's and 44's.
I agree wholeheartedly...I know I am.

Just for an idea of how small I am stuck in my thinking I can tell you what tire to run on certain spline counts in a 35, 44 and 8.8.

But then I think stock 9" with 31 spline shafts...and I get lost. I don't know what it will hold. If I never move past 37" tires do I really ever need to move past alloy 31 spline shafts? I stayed up until 3:30am searching and researching and learning and crying and getting confused and finding "a ha!" moments. I'm still lost.


BUT I am going to look at it today, and most likely pick it up.

My thoughts are that if I gear it at 4.11 (do it myself since the 9" is so easy) and stick with 31 spline stock shafts for now. I SHOULD still be able to use a big bearing 3rd member with the stock shafts if I run the stock carrier...THEN when/if I want 35 spline shafts, I can simply swap over a 35 spline ARB and shafts, use the same gears and just set them up again. No biggie. Right?

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Finesse in crawling looks way cooler than momentum.
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post #48 of 82 Old 07-14-2010, 11:04 AM
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All these questions about strength and you haven't mentioned what is likely to be your biggest problem with a LP 9" in a TJ.......
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post #49 of 82 Old 07-14-2010, 11:28 AM
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Would that be driveline angles for $100 Bob?
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post #50 of 82 Old 07-14-2010, 12:08 PM Thread Starter
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Would that be driveline angles for $100 Bob?
I believe it.

If I showed you how long my rear driveshaft is, would you believe me? Jason (who used to run Red Rock 4x4), and Tom Wood both made me measure two or three times because my measurements sounded stupid long.


Shouldn't having all that extra expendable driveshaft length help since the 3rd member sticks out so far?


Or is there a better way to deal with it? I've been wondering about this, but NOBODY has info about it in any build thread or write up I have seen.

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Finesse in crawling looks way cooler than momentum.
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post #51 of 82 Old 07-14-2010, 12:22 PM
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From what I've seen, your rear shaft would be stupid short with a LP9. I guess it's time to stretch.

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post #52 of 82 Old 07-14-2010, 12:30 PM Thread Starter
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From what I've seen, your rear shaft would be stupid short with a LP9. I guess it's time to stretch.
I wonder what knuckelhead did since his TJ doesn't appear to be stretched.

Or are the Currie 3rd members shorter?


With that said, I wouldn't be using the stock 3rd member either...hmm more research.

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Current vehicles: 06 F250 Superduty - 6.0L PSD Straight piped and tuned
03 CBR600RR -1 +2, Yoshi'd & Battlaxed

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Finesse in crawling looks way cooler than momentum.
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post #53 of 82 Old 07-14-2010, 12:41 PM
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Knucklehead has a HP 9. He only runs 35's so he's all set.
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post #54 of 82 Old 07-14-2010, 12:55 PM Thread Starter
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Well that's fun.

I don't plan on any crazy stretch...I might triangulate my uppers and ditch the trackbar in the process, that would give me a couple inches I could use to stretch.

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Current vehicles: 06 F250 Superduty - 6.0L PSD Straight piped and tuned
03 CBR600RR -1 +2, Yoshi'd & Battlaxed

Quote:
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Finesse in crawling looks way cooler than momentum.
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post #55 of 82 Old 07-14-2010, 12:57 PM
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Quote:
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From what I've seen, your rear shaft would be stupid short with a LP9. I guess it's time to stretch.
ding ding ding

I'm on board with you apex. The 9" solves a lot of my woes too....

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post #56 of 82 Old 07-14-2010, 01:12 PM Thread Starter
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ding ding ding

I'm on board with you apex. The 9" solves a lot of my woes too....


Lol well I am going to see how I can make this work without stretching the rear end 6".

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Current vehicles: 06 F250 Superduty - 6.0L PSD Straight piped and tuned
03 CBR600RR -1 +2, Yoshi'd & Battlaxed

Quote:
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Finesse in crawling looks way cooler than momentum.
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post #57 of 82 Old 07-14-2010, 01:16 PM
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What about a DS with a CV joint at eaxh end?
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post #58 of 82 Old 07-14-2010, 01:37 PM Thread Starter
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Ok, so I have a bunch of "it shouldn't work without a stretch"

How much further does the lp 9" stick out? How much would it shorten my driveshaft?

Bear in mind my driveshaft is currently 19" long from middle of the ujoint to middle of the ujoint.

Silver 02 TJ Apex Edition. SOLD

Current vehicles: 06 F250 Superduty - 6.0L PSD Straight piped and tuned
03 CBR600RR -1 +2, Yoshi'd & Battlaxed

Quote:
Originally Posted by bddisi View Post
Finesse in crawling looks way cooler than momentum.
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post #59 of 82 Old 07-14-2010, 02:55 PM Thread Starter
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leaving to go pick it up...adios.

Silver 02 TJ Apex Edition. SOLD

Current vehicles: 06 F250 Superduty - 6.0L PSD Straight piped and tuned
03 CBR600RR -1 +2, Yoshi'd & Battlaxed

Quote:
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Finesse in crawling looks way cooler than momentum.
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post #60 of 82 Old 07-14-2010, 06:12 PM
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I wonder what knuckelhead did since his TJ doesn't appear to be stretched.

Or are the Currie 3rd members shorter?
Yep.
And with the HP the DS length is not a problem. An automatic transmission also has a longer rear DS.



I did a lot of thinking and research on this (6 months). The triangulated J arm setup with Currie HP9" was my solution. No regrets ever since I installed it 5 years ago. The Explorer disc brakes were just another added plus...
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