4x4 zf

scotb · Post by **scotb** » Wed Feb 06, 2008 5:01 pm

can a rr zf auto ,1988 box be converted to 2 wheel drive and how?

Post by **katanaman** » Wed Feb 06, 2008 5:18 pm

Yes take the transfer box off and bolt a tail housing on from a BMW or Jag. If you have a quick search you will find quite a few threads covering this.

ChrisJC · Post by **ChrisJC** » Wed Feb 06, 2008 5:31 pm

I'd be interested to hear how you get on.... as I'm not 100% convinced that the output shafts are the same.........

Chris.

russell_ram · Post by **russell_ram** » Wed Feb 06, 2008 6:21 pm

"I'm not 100% convinced that the output shafts are the same"

They're not, and you have to totally strip the box to change them as they come out 'through the front'. It's much, much, much easier to do it the other way and get a 2WD BMW or Jag box and bolt on the bell housing and torque convertor from a 4x4 RR or Discovery box. OK, the shift maps/governor won't be quite right for a V8 (but they'll be close if you use a diesel BMW box) but then you don't really want 4x4 maps in a 2WD drive car either. Either way you need both boxes in any case.

Russ

scotb · Post by **scotb** » Wed Feb 06, 2008 7:06 pm

sounds like too much bother, anybody got cheap sd1 aout borg warner 65 and torque convertor......

leepop633 · Post by **leepop633** » Wed Feb 06, 2008 7:16 pm

Ive got a 4x4 box here minus the transfer. I will take a pic of the splines and people can confer. I was told off a guy who put a 4.6 in his granny and thats all he done, changed tail end for a beemer and sump.

scotb · Post by **scotb** » Wed Feb 06, 2008 7:24 pm

await anything anybody would like to add.got lots a time, not got chassis built for my moggy yet.

ChrisJC · Post by **ChrisJC** » Thu Feb 07, 2008 8:23 am

Sherpa ZF4HP22:

output shaft:

and a pic of the Sherpa tailcone:

I guess we need pics from other variants to be sure......

Chris.

leepop633 · Post by **leepop633** » Thu Feb 07, 2008 9:13 am

Will try and dig my zf out of the shed at weekend and take pics but looks like the output shaft splines are different from memory.

ChrisJC · Post by **ChrisJC** » Thu Feb 07, 2008 10:11 am

Right, according to this:
http://www.jpat.co.uk/jpat_pdfs/ZF%20Ac ... 04HP22.pdf
which contains an exploded diagram & parts list of the ZF4HP22, there are 6 different types of output shaft.

And it appears the Range Rover one is different to all the 2WD drive ones.

So therefore I conclude that if you want to change a Range Rover autobox to 2WD, you need the output shaft & matching tailcone from a different version of the box. And as said here (and elsewhere), changing the output shaft entails a complete teardown & rebuild of the gearsets:

http://www.cowdery.org.uk/zf.php

Chris.

JSF55 · Post by **JSF55** » Thu Feb 07, 2008 10:20 am

All ican add to this is when i changed from the gm180 to the jag version, it was almost a bolt in job, even the prop hooked up changeing the bellhousing and convertor was easy, compared to stripping and rebuilding a box !

ChrisJC · Post by **ChrisJC** » Thu Feb 07, 2008 10:38 am

Yup, I would start with a 2WD one and change the bellhousing / torque converter. The same exploded diagram / parts list above shows that there's only one input shaft type........

I might even consider swapping the valve block & governor with a Range Rover one, as both of those jobs are simple enough.

Chris.