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Old 01-25-2009, 07:48 AM   #1
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dana hp30 installed

so i put a wrench on my xj and took out the hp30 out of the front end. all the perches and control arms lined right up. it took me 3 hours took complete by myself. took it out of xj, unistalled the dana 30 out of the tj and reinstalled the hp30 in the tj. one thing i forgot because i was so dam excited and wanted to get it in asap is the gearing. my jeep isn't driviable right now. the gearing is different and i don't want to mess anything up. i'm going to trailer it to the shop tues. morning. i didn't swap my 35 for a 44 like i intended, instead i went to the yard and pulled it out yesterday with a friend of mine. i ended up paying $400 and it has rear discs. my birthday is coming soon so i'm asking my wife for a front axle kit for the 30 and then i'll have to figure out the gearing issues. i know i will need new gears front and rear.
does anyone have a gearing chart? i use my jeep as a dd, but it is also a everyday warrior. if i see something i want to try i just do it. i'm thinkg 4.10's, but if anyone knows what would be better let me know. i never take my jeep on the hwy and i rarely drive more than 45mph. most of the time i just putt around. (i don't work, hate me if you must).

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Old 01-25-2009, 07:57 AM   #2
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i'm thinking right now for my better interest would be to reinstall the 30 in the tj and wait till i get the axle kit and have a chance to re-gear both diffs. (then i can sneak them off to the powder coaters too) i would be able to rebuild both axles as well.
what would be a good build up on these?
front is a dana hp30 and rear would be a dana 44.
i want to do alloys and seals, bearings, lockers.
think budget please. i already have the axle housings.
budget is $2500 for both. this is breaking my bank but of course i want it done right. i don't like going back to fix things i stimped on. i like to do it right the first time around.

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Old 01-25-2009, 10:31 AM   #3
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What size tires are you running and do you plan to go any bigger??? IMO 31s=4.10 33sto35s=4.56 35s+ =4.88
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Old 01-25-2009, 10:46 AM   #4
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i plan on running 33's most of the time with the exception of 35's when i go mudding or a really hard trail ride. i know i'll lose flex when i run the 35's
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Old 01-25-2009, 10:51 AM   #5
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if i take on a short trip about 12 miles, how bad will it mess things up. i don't know what gears i have in either diff but i can tell you when i drive it something just isn't right. been around the block twice, but my block is about 3 miles. hope i didn't already do the damage.
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Old 01-25-2009, 11:36 AM   #6
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if you are payin to regear, make sure you regear it to what you want it, so you dont have to regear later down the road..

4.56s atleast if you ever plan to throw 33s or bigger on it

i drove my jeep with 3.07s in the front and 3.73s in the rear.. as long as its in 2wd you are ok, heck you could even pull your front driveshaft if you want to..
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Old 01-25-2009, 12:34 PM   #7
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Quote:
Originally Posted by infamousbliss View Post
i plan on running 33's most of the time with the exception of 35's when i go mudding or a really hard trail ride. i know i'll lose flex when i run the 35's
4.56 if you have a 4.0

4.88 if you have a 4 banger
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Old 01-25-2009, 03:38 PM   #8
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MoA is right. As long as you don't put it in 4wd then the gearing difference won't matter on the road. Just don't put it in 4wd on your way to the gear shop.
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Old 01-25-2009, 03:55 PM   #9
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remove the front drive shaft and just drive it
the front doesnt have unlocking hubs so it still turns in 2wheel drive but if you remove the front driveshaft it will be fine


as for whet to do with building that axle put 30spline alloys with the 30spline arb
and if you want to go crazy one of the 4x mags just did a build of a
HP D30/44 hybird
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Old 01-25-2009, 04:18 PM   #10
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Quote:
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remove the front drive shaft and just drive it
the front doesnt have unlocking hubs so it still turns in 2wheel drive but if you remove the front driveshaft it will be fine


as for whet to do with building that axle put 30spline alloys with the 30spline arb
and if you want to go crazy one of the 4x mags just did a build of a
HP D30/44 hybird
True it does spin however unless the Tcase has the fron engaged it just free spins.
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Old 01-25-2009, 07:29 PM   #11
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i had put it in four wheel for about 100 yards and it seem like it was surging a little. i then disengaged it and all seemed to be fine. i only put it in four high. 4.56's sound right for me. thanks for the heads up.
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Old 01-25-2009, 07:52 PM   #12
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Quote:
Originally Posted by infamousbliss View Post
i had put it in four wheel for about 100 yards and it seem like it was surging a little
wait what? you put it in 4hi with different gear ratios?
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Old 01-25-2009, 08:02 PM   #13
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yeah and i drove it for 100 yards or so. i wanted to know if i did any damage? it surged a little.
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Old 01-25-2009, 08:04 PM   #14
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i plan on rebuilding it anyways. i'm not to worried if i did do damage. now i have an excuse...right
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Old 01-25-2009, 08:06 PM   #15
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are you rebuilding the internals of the tcase too? :P
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Old 01-25-2009, 08:13 PM   #16
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It was doing that because everything was binding up and then unloading.

I'm sure that you didn't do any kind of damage.
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Old 01-26-2009, 09:11 AM   #17
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i ordered a two rebuild kits from quadratec. the kits that include the seals, gaskets, crush sleeves, and bearings. my mechanic told me about ten minutes ago he can get me a set of 4.88's for around $300. (does that sound good for a set of gears?) i have the carriers and pinions still. i plan on putting some sort of lockers in there and some sort of alloy axles. besides that, it's just gonna take me some more time. i spent my money for my sye on the dana 44 and rebuild kits. going to run the drop transfer case for now. i should be able to purchase my slip yoke in march or april, and the axles are going to have to wait till june or july before they are completed.

what is going to be the difference between the 4.88's and 4.56's? is my gas mileage gonna crap the bed? (not that i really care?) i drive about 150 miles a week, if that. so mpg isn't a real big concern but it is nice to know. i will be running 33's.
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Old 01-26-2009, 09:50 AM   #18
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You will want to go with 4.56 for 33s and that would be ok even on the occasions that you have the 35s on.I wouldn't go with 4.88 just to run 35s every now and then and 33s most of the time because that will drop your MPG due to the fact it would be like running a 5 speed in 4th gear at 70MPH down the highway and never shifting into 5th.And actually with the 4.56 gears and 33s you should notice a slight increase in MPG.What is yours now,3.73s???
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Old 01-26-2009, 12:09 PM   #19
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i have no clue as to what gearing i have. i bought it as a stock 2002 wrangler sport w/ auto. dana 30 & 35. i have since switched the 30 back in so i could get around. my wife won't let me drive my rubi do to the stipulation i told her i bought it for her. i now watch what i say around her, but i can do whatever i want to my tj and she's just says it's your jeep do what you want.
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Old 01-26-2009, 12:12 PM   #20
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again thanks for all the info. i'll be down the garage for the next 2 days and i'll speak with my mechanic about the axles. my jeep has got to go back in, in a month or two for the sye install, if i can piece together an axle build up using used parts i might be able to get them in at the same time.
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Old 01-26-2009, 12:13 PM   #21
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if i just install the gears i should be alright till i can get the rest of the parts. that would be my best bet so i can sell my old axles for some extra funding.
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Old 01-26-2009, 12:18 PM   #22
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Originally Posted by mr4x4 View Post
remove the front drive shaft and just drive it
the front doesnt have unlocking hubs so it still turns in 2wheel drive but if you remove the front driveshaft it will be fine
There is absolutely no need to remove the front driveshaft. The OP's not an idiot who will try to drive it on the highway or at length in 4x4 with mis-matched front and rear ratios.

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