transfer box front bearing & oil seal

Gentlemen,

I would appreciate your advise. My 1999 V8 Disco II (I'm fresh owner) makes strange BANG noise while accelerating and decelerating/braking. I took it to repair shop, not official BritishMotors dealer, but to second and last LR garage. They've diagnosed me with a number of things, including

-front propeller shaft front V worn, needs replacement
-transfer box, LT230SE, front bearing

The estimated cost for replacement is around 200 pound together with BritPart replacements.

My questions are:
-did anyone attempt replacing the bearing and oil seal without the LRT-51-003, LRT-99-500, and LRT-41-012 tools? (because it looks like I can do it myself in garage if the tools are not THAT necessary)

-does it at all sound reasonable, diagnostic and fault? asking because I don't trust them 100%

-would BritPart be a reasonable replacement? I was told that all solid steel things from bp are ok, but the rubbers are too soft and generally suxx. Is that true?

All opinions appreciated, thanks!!!

do it yoself.
I havent had probs with Britpart - but others dont call them ****part for nothing.

This might be useful...
How to Remove/Renew Transfer Case Front Output Shaft Bearing
and this
http://www.landyzone.co.uk/lz/f38/how-replace-front-transfer-box-output-oil-seal-59242.html
and this
http://www.landyzone.co.uk/lz/f41/uj-renewal-59812.html

but, clonking on taking up the drive is more commonly caused by a worn A Frame Ball Joint...
http://www.landyzone.co.uk/lz/f41/upper-link-frame-bushes-renewal-65602.html

Thanks! I'll see if it's A frame joint later today or tomorrow.

Another one - is replacing swivel joints (upper and lower) on left front wheel a do-it-myself job? Garage was all "it's so hard even with LR tools..."

Swivels aren't too difficult on Disco 1 - I don't know if D2 is different?
The only special tool needed is a spring-balance for setting the preload.
Paddocks do a kit, containing all the parts you need and will deliver anywhere.

http://www.landyzone.co.uk/lz/f41/swivel-ball-renewal-63808.html

if yu are thinking of going fur a 2" lift - they do camber adjusted swivels anorl.