range rover transfer box swap

[JIMBOBLY]

hello people,my question is,my rangie still has the standard borg warner transfer box,i believe its possible to fit an lt230 unit to the original auto box,whats involved in doing this,and what ratio would be better for 235/85x16,im thinking 1.410,what do you think?any help is always appreciated,jim. :D

[Bowie]

1.4 will lower your gearing to slightly less than stock, so will accelerate faster, but it's not much :)

[ChrisV8]

I run a Disco 1.2 transfer behind my 200tdi with 5 speed LT77 in my RR and it's fine with 235/85 x 16s, tows my big trailer loaded with no real issues either.

[Range Rover Blues]

I find my V8 struggles a bit with 238/85s on it, but I'm not sure it's giving 100%v any more.  Given the choice though I'd fit the 1.4 box to keep the gearing correct, it is 10% or thereabouts between the original tyres and the taller ones you have.

[Henry Webster]

Why replace the Borg Warner?  I much prefer the way a car with the viscous centre handles to an LT230.  If you want to lower the ratio Tomcat Motorsport do a reduced ratio gear and chain kit for the BW.

[JIMBOBLY]

well thaks everyone for the replys,i didnt know they done such a kit for the borg warner box,that'd be far better way,even if it does cost more,dont spose you know of a web site or something do you henry?cheers.

[Range Rover Blues]

Why replace the Borg Warner?  I much prefer the way a car with the viscous centre handles to an LT230.  If you want to lower the ratio Tomcat Motorsport do a reduced ratio gear and chain kit for the BW.

When it's moving I prefer the B-W too, but once it's stood still I sometimes find having the handbrake only work on the rear wheels a PITA, you can't winch a second vehicle anywhere near as effectively and on one occasion I found it dangerous.  The one thing the B-W lacks is a positve lock-up, otherwise it's a far better box in many ways.

[Henry Webster]

http://www.tomcatmotorsport.co.uk/

[clbarclay]

Even with a locked LT230, I always have someone with their foot on the brakes to make sure all 4 wheels are locked when winching.

Does the Tomcat kit for the BW change the low range ratio as well as the hi range? It may be an alternative to a pair of new ring and pinions to retain the low range speed with bigger tyres.

[JIMBOBLY]

http://www.tomcatmotorsport.co.uk/

cheers henry,you're a diamond,and thanks again to all of you,jim. :D

[Range Rover Blues]

Does the Tomcat kit for the BW change the low range ratio as well as the hi range? It may be an alternative to a pair of new ring and pinions to retain the low range speed with bigger tyres.

I'd imagine it does because the B_W works differently to the LT230, the low range is via an epicyclic gearbox on the inout shaft, both ratios then drive viz the same chain drive.  In high range the epicyclic gearbox is locked out.

[clbarclay]

Thanks Andy, another option to bear in mind.

[Range Rover Blues]

I'd thought about changing the pinion and crownwheels too but as Tim at D44 pointed out it would be better to use stock parts as much as possible, for example if you trash a diff you've had it until you get a new one built.  Changing the T box is probably the better option, I'm planning a Defender lt230 when I can afford a good one.

[buster uk]

how do i check that its locking up ?
The reason i ask is, i blew another front diff the other day.Managed to drive a few miles in rear drive but then lost all drive.Only the front prop was spinning and no drive.I put another front diff in , now it drives but im concerned the transfer box is goosed or maybe just the lock up

[Range Rover Blues]

Hmmm, unusual that the viscous diff fives up, they normally overheat and seize solid.

I'd strongly suggest you fit a good LT230 and have a manual diff lock now Buster, with those tyres you are putting more strain on the drivetrain than it was designed for and a good Borg-Warner won't come quite as cheap.

[Henry Webster]

It is unusual indeed for the viscous not to fail solid.  You might have stripped the splines - this is more likely if the box has done some work!

[buster uk]

It is unusual indeed for the viscous not to fail solid.  You might have stripped the splines - this is more likely if the box has done some work!

stripped the splines in the transfer box ? This would make sense as its been cluking from the transfer box quite badly when put into drive.
If i use a defender lt230, what do i get the hi/low lever and linkages from as mines an auto with borg warner transfer box.

[Range Rover Blues]

You should find the linkages on any Disco that's being broken.

You will see in fact that the lever on te BW will look like a LT230 lever that's been welded up.