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Old 07-31-2011, 09:21 AM   #1 (permalink)
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Newbie P38 Axle Question

Since I was smart enough to buy a Range Rover P38 for myself,

i've added 245/75/16 tires E rated, 65 lbs each, pro-comp rockcrawler wheels, 40 lbs each and about 2 inches of lift. my gas mileage sucks ass especially when i add all my camping crap i take when i go 4 wheeling.

before i did the lift and tires i was getting around 19 mpg highway. now i get 13mpg.

the power isn't bad, my motor has 110K miles on it now. i have a 2001 HSE with the 4.6L.

I think i currently have 3.54 gears in the rover with 24 spline center chunks front and rear.

It seems like all there is for gearing is 4.10's for this axle. I'd really like to be around 3.73 for towing and hauling my crap. i like to run down the interstate at 80 mph so i think the 4.10's would have me reving to 4000 rpm going that fast.

any solutions for this or other places i can get gearing for it. i'd also like to add an ARB locker in the rear. would some dana axles be a better choice? they would have to be custom built, but having gearing, locker and domestic parts at hand anywhere would be helpful.

i'm not building a rock crawler, i know its not the pirate way, i've kind of grown out of that.
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Old 07-31-2011, 12:47 PM   #2 (permalink)
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Dana axles are great, but the cost to switch over snow balls really fast.

If you are looking for suggestions, call Justin at http://lucky8llc.com/, he is who I get most of my drivetrain parts from and is familiar with your platform.
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Old 07-31-2011, 03:25 PM   #3 (permalink)
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Quote:
Originally Posted by miniyota View Post
Since I was smart enough to buy a Range Rover P38 for myself,

i've added 245/75/16 tires E rated, 65 lbs each, pro-comp rockcrawler wheels, 40 lbs each and about 2 inches of lift. my gas mileage sucks ass especially when i add all my camping crap i take when i go 4 wheeling.

before i did the lift and tires i was getting around 19 mpg highway. now i get 13mpg.

the power isn't bad, my motor has 110K miles on it now. i have a 2001 HSE with the 4.6L.

I think i currently have 3.54 gears in the rover with 24 spline center chunks front and rear.

It seems like all there is for gearing is 4.10's for this axle. I'd really like to be around 3.73 for towing and hauling my crap. i like to run down the interstate at 80 mph so i think the 4.10's would have me reving to 4000 rpm going that fast.

any solutions for this or other places i can get gearing for it. i'd also like to add an ARB locker in the rear. would some dana axles be a better choice? they would have to be custom built, but having gearing, locker and domestic parts at hand anywhere would be helpful.

i'm not building a rock crawler, i know its not the pirate way, i've kind of grown out of that.
You may get some more specific data on:
http://hardrange.com/
http://forums.lr4x4.com/
http://www.rangerovers.net/
Hope that helps, also I would be very keen to see any pics of your lift (pm me!)
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Old 07-31-2011, 04:29 PM   #4 (permalink)
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there are some pictures of it on my blog. www.getlost4x4.com

i'm running OME springs from a RR classic and Bilstien 5150 shocks.

nothing special. i've just been fixing it up from the previous owners sins. i bought it for $5500 and i've put about $2000 into since i bought it in Nov. 2010. it had 98000 when i bought it, its at 110K now.
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Old 07-31-2011, 09:34 PM   #5 (permalink)
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find a calloway Tcase, it has lower gearing. you are very limited with P38 diffs (they are specific and the other ones wont fit)
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Old 08-01-2011, 05:32 AM   #6 (permalink)
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You currently have a BorgWarner NV225 transfer case, these are interchangeable with a LT230 transfer case off a discovery 1 or defender.

There are many ratio's of LT230 which will give you a much more desirable cruising speed, its quite a common modification here in england to swap a 1.2:1 ratio transfer case off a discovery onto a defender.

A defender transfer case is generally 1.4:1 but you can get 1.6:1 from various models.
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Old 08-01-2011, 06:48 AM   #7 (permalink)
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The P38 transfer box offsets the propshafts to the opposite side to an LT230??

Don't think they will swap!
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Old 08-01-2011, 06:38 PM   #8 (permalink)
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can the LT230 be clocked to the driverside?

i'd love to get one of those tcases.
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Old 08-01-2011, 07:46 PM   #9 (permalink)
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Quote:
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can the LT230 be clocked to the driverside?

i'd love to get one of those tcases.
It wasn't designed or intended to be rotated like that, but if you are willing to put the time into it there's no reason why not.
You'll need to setup adapter plates to mount it, move all the fill and vent points and then connect and protect the now exposed hi-lo and CDL linkages.
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Old 08-01-2011, 07:59 PM   #10 (permalink)
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can the LT230 be clocked to the driverside?

i'd love to get one of those tcases.
No.
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Old 08-01-2011, 09:28 PM   #11 (permalink)
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actually there is an easier way to do it.

use D2 axle housings, swap my center chunks, axles, and brakes over, and use a LT230 with center diff lock. there is a rolled D2 in the junkyard. hmmm measurements will be forth coming.
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Old 08-01-2011, 09:33 PM   #12 (permalink)
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actually there is an easier way to do it.

use D2 axle housings, swap my center chunks, axles, and brakes over, and use a LT230 with center diff lock. there is a rolled D2 in the junkyard. hmmm measurements will be forth coming.
check where the gas tank is, and report back.
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Old 08-01-2011, 09:34 PM   #13 (permalink)
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i'll move it to the other side.
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Old 08-01-2011, 10:20 PM   #14 (permalink)
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i'll move it to the other side.

yeah yeah... your gonna realize it isn't that great of a platform, much less one to do all of that modification too.... i have owned two, a 2000 10th anniversary great divide event truck/lr equinox training vehicle and a 2001 holland and holland so im not biased against them too bad...

sad to say, a newer big body rr will kick its butt off road and get to the trail in way more comfort and style...

like i said, find a calloway tcase and run it. it is high 1.294:1 low 3.481:1 vs high 1.216:1 low 3.271:1 (iirc) in the rest of them... and dont just buy one off of ebay, make sure it is really the right one...
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Old 08-02-2011, 03:20 AM   #15 (permalink)
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Did you ever put your springs on right?
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Old 08-02-2011, 04:29 AM   #16 (permalink)
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Quote:
Originally Posted by Mortus View Post
You currently have a BorgWarner NV225 transfer case, these are interchangeable with a LT230 transfer case off a discovery 1 or defender.

There are many ratio's of LT230 which will give you a much more desirable cruising speed, its quite a common modification here in england to swap a 1.2:1 ratio transfer case off a discovery onto a defender.

A defender transfer case is generally 1.4:1 but you can get 1.6:1 from various models.
An LT-230 will not bolt directly to the transmission of a P38. The transmission rear housings are completely different for several reasons.

Putting an LT-230 into a P38 is gonna require some electrickery to explain to the BeCM and transfer case controller why there are no inputs from the transfer case.
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Old 08-13-2011, 11:58 PM   #17 (permalink)
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just some more to throw out there the gear reduction on the borg warners is done from input cog to output cog.(besides the planetary). and the internals are supposed to be similar to ford bw's so what about swapping out the ford 1:1 cogs in combination with 4.10s. your case should still retain a 2:71 (or is it2:67?) low range.

Last edited by well; 08-13-2011 at 11:59 PM.
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