88mjmanche Posted December 3, 2009 Share Posted December 3, 2009 anyone dothis??? is it possiable... anything is possiable i know but how easy is it and what parts do i need and what adaptor is needed. :dunno: just wondering Link to comment Share on other sites More sharing options...
JeepcoMJ Posted December 3, 2009 Share Posted December 3, 2009 gonna be doing it for a friend's jeep soon....google search box4rocks np231 doubler, it will come up with some good write-ups on other forums. ...I don't know if box4rocks is still available, but there are other doubler companies. it's not cheap, but I'm told it's worthwhile. you'll need the front half of an np231 case to do it, plus your good np231 Link to comment Share on other sites More sharing options...
cracker Posted December 3, 2009 Share Posted December 3, 2009 This is a tough thing to decide. I did my math and low/low is too low (7.4:1) and low/hi (2.72:1) is too high. My AA Atlas with a 3.8:1 was perfect on 37s with 5.13s and an AW4. My buddy tried a 5:1 on an auto and it was WAY too low so I know the 7.4:1 wouldn't work. My buddy with a 5:1 and an AX-15 loves it on 40s and 5.38s. For my MJ, I chose a 4:1 Klune in front of a 231. I now have a three speed TC set up with 2.72:1, 4:1, and 10.88:1 If you were to find a NP205 (2:1) and a 231 (2.72:1) it would be a nice combination of 5.44:1. Good luck. Link to comment Share on other sites More sharing options...
Oizarod115 Posted December 4, 2009 Share Posted December 4, 2009 you could always do a 4lo kit to take your 231 to 4:1 ratio... or if you use the doubler run a higher gear in the transmission to pick ratios. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted December 4, 2009 Share Posted December 4, 2009 both the klune and the 4:1 kit cost more than twice what a box4rocks doubler kit costs. not in my budget in any foreseeable future...upwards of $1200 for that... best bet for 4:1 is to find someone who totalled a rubicon wrangler and nab that np231 Link to comment Share on other sites More sharing options...
cracker Posted December 4, 2009 Share Posted December 4, 2009 both the klune and the 4:1 kit cost more than twice what a box4rocks doubler kit costs. not in my budget in any foreseeable future...upwards of $1200 for that... best bet for 4:1 is to find someone who totalled a rubicon wrangler and nab that np231 There are deals to be had. The 4:1 rubicon will be tough to get your speedo going. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted December 4, 2009 Share Posted December 4, 2009 both the klune and the 4:1 kit cost more than twice what a box4rocks doubler kit costs. not in my budget in any foreseeable future...upwards of $1200 for that... best bet for 4:1 is to find someone who totalled a rubicon wrangler and nab that np231 There are deals to be had. The 4:1 rubicon will be tough to get your speedo going. ...and will still be cheaper than spending $2000+ on a klune. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted December 4, 2009 Share Posted December 4, 2009 plus, IIRC the case is the same...the only difference is the output housing where the speedometer assembly *should* mount, and there probably is not a worm gear on the output shaft. but, if it's true to most NP t-cases, you can *probably* take the guts from a rubicon case, put them in a regular np231 case, and either add a worm gear for your speedo gear, or swap output shafts with a regular np231 t-case. Link to comment Share on other sites More sharing options...
cracker Posted December 4, 2009 Share Posted December 4, 2009 plus, IIRC the case is the same...the only difference is the output housing where the speedometer assembly *should* mount, and there probably is not a worm gear on the output shaft. but, if it's true to most NP t-cases, you can *probably* take the guts from a rubicon case, put them in a regular np231 case, and either add a worm gear for your speedo gear, or swap output shafts with a regular np231 t-case. Nope. It is all electronic. The parts are quite different and nicer! I rebuilt a RockTrac and can post up all the images for you if you want. I took them for the TeraFlex website and their 2LO install. I never priced a Klune. One fell into my lap. I spent the $80 on a couple of parts from them to get it going. Doint it again I would probably get an atlas at the price you stated but I didn't pay that much for my Atlas though. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted December 4, 2009 Share Posted December 4, 2009 plus, IIRC the case is the same...the only difference is the output housing where the speedometer assembly *should* mount, and there probably is not a worm gear on the output shaft. but, if it's true to most NP t-cases, you can *probably* take the guts from a rubicon case, put them in a regular np231 case, and either add a worm gear for your speedo gear, or swap output shafts with a regular np231 t-case. Nope. It is all electronic. I never priced a Klune. One fell into my lap. I spent the $80 on a couple of parts from them to get it going. Doint it again I would probably get an atlas at the price you stated but I didn't pay that much for my Atlas though. what's all electronic? the speedo? yes, it is. the 91+ ones were electric too, but you could pull the electric sender out and put a mechanical one in...they were the same. with that in mind, I think someone with a bit of time and inginuity could pull it off. Link to comment Share on other sites More sharing options...
Geonovast Posted December 4, 2009 Share Posted December 4, 2009 Why wouldn't the rubi case have a worm gear? What does it have to tell the speedometer what to do? Link to comment Share on other sites More sharing options...
JeepcoMJ Posted December 4, 2009 Share Posted December 4, 2009 Why wouldn't the rubi case have a worm gear? What does it have to tell the speedometer what to do? reed switch (magnetic sensor) inside a magnetic ring on the output yoke/flange...it does not have a slip rear driveshaft Link to comment Share on other sites More sharing options...
cracker Posted December 4, 2009 Share Posted December 4, 2009 what's all electronic? the speedo? yes, it is. the 91+ ones were electric too, but you could pull the electric sender out and put a mechanical one in...they were the same. with that in mind, I think someone with a bit of time and inginuity could pull it off. The 231s were the same but the RockTracs are not. JB Conversions makes an adapter to use the electronic plug (RockTrac is a 4 prong and the XJ/MJ is a 3 prong). http://www.jbconversions.com/index2.php?pc=7 The folks I know that have it never addressed the speedometer issue and are going without. I would like to see the one who comes up with a way of making this compatible with the mechanical speedometer. :wavey: Link to comment Share on other sites More sharing options...
Pete M Posted December 4, 2009 Share Posted December 4, 2009 bah. speedometers are overrated. I use the Tach in my 88. :D Link to comment Share on other sites More sharing options...
HKB3 Posted December 4, 2009 Share Posted December 4, 2009 I am using a 231/D300(flipped) doubler with a Box4rocks kit. plenty of info on pirate4x4 Link to comment Share on other sites More sharing options...
88mjmanche Posted December 4, 2009 Author Share Posted December 4, 2009 I am using a 231/D300(flipped) doubler with a Box4rocks kit.plenty of info on pirate4x4 flipped can you show me a pict ???? Link to comment Share on other sites More sharing options...
HKB3 Posted December 5, 2009 Share Posted December 5, 2009 I do not have any pics of my setup(it is in boxes in my shed) you can find some good pics at down east offroad or google "flipped dana300" I copyed the d.e.o. flip kit with some drawlings I got on pirate 4x4 Link to comment Share on other sites More sharing options...
jpnjim Posted December 5, 2009 Share Posted December 5, 2009 Flipped 300/flipped 231 doubler: 231/300 doubler vs Atlas: Atlas size compared to D300: Link to comment Share on other sites More sharing options...
HKB3 Posted December 5, 2009 Share Posted December 5, 2009 the Dana 300 above does not have a flip kit installed, which can work fine but limits shifter options & could leak from the shift rails. I do not have any pics of my setup(it is in boxes in my shed)you can find some good pics at down east offroad or google "flipped dana300" I copyed the d.e.o. flip kit with some drawlings I got on pirate 4x4 here a couple pics of the flip kit Flip kit installed 231/D300 (NOT flipped) Link to comment Share on other sites More sharing options...
akamcbird Posted December 5, 2009 Share Posted December 5, 2009 had to share cause its bad @$$ http://www.alaska4x4network.com/showthread.php?t=38178 Link to comment Share on other sites More sharing options...
cracker Posted December 6, 2009 Share Posted December 6, 2009 had to share cause its bad @$$ http://www.alaska4x4network.com/showthread.php?t=38178 Wow. That is a lot of work for just 7.5:1 Link to comment Share on other sites More sharing options...
jpnjim Posted December 6, 2009 Share Posted December 6, 2009 the Dana 300 above does not have a flip kit installed, which can work fine but limits shifter options & could leak from the shift rails. Yeah, that was the mock up stage, the plan was to run a STaK replace-a-case. Stronger than the stock 300 case, and has the output on the correct side without flipping it. It's just the old problem of once you do the math: case + $$ for the HD ft output + 4:1, you're knocking on the door of an Atlas. Then AA offered a 5:1 Atlas w/HD ft output, + lube & tube kit for $1995 this time last year, so I readjusted 'the plan'. :D Link to comment Share on other sites More sharing options...
jpnjim Posted December 6, 2009 Share Posted December 6, 2009 had to share cause its bad @$$ http://www.alaska4x4network.com/showthread.php?t=38178 Wow. That is a lot of work for just 7.5:1 :yes: And using 3 boxes with the same exact low range really limits your selection. Triple 1.96 cases (4 options): 1.96 x 1.96 x 1.96 = 7.53 1.96 x 1.96 = 3.84 1.96 = 1.96 1:1 There are cheaper options that would give you deeper overall gears, and as many, or more gear choices, but most aren't even close in strength to this combo. Link to comment Share on other sites More sharing options...
akamcbird Posted December 6, 2009 Share Posted December 6, 2009 i think that guy was after strength... here is his build thread http://www.alaska4x4network.com/showthread.php?t=32573 Link to comment Share on other sites More sharing options...
pingpong Posted December 7, 2009 Share Posted December 7, 2009 I think with rockwells as axles 7to1 in the t-cases give it helluva low firsy gear. ON my truggy I am doing the Jed's machine 203/d300 doubler. With new 203 to 300 output, it was 600 shipped. Of course this will be tripple sticked, But I am going to make my own cable shifters for it though. I will have 1 to 1 2 to 1 1 to 2.64 1 to 5.28 With the option of ading a 4 to 1 to the d300 for an ultimate low of 8 to 1. Also be able to do front digs :yes: Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now