I had what sounded like similar noise which would happen when slowing down coming to a stop, in my case in the end it was bearings in the LT77 gearbox shot so had to fit a recon. When i got it out though the bronze spiggot bearing in the end of the crankshaft was also knackered I am told these can make strange noises when loose. Have you checked / changed gearbox oil. I fitted the recon gearbox a few weeks ago and since then I have now become obsessed with noises and rattles like it some kind of disease. I had a bad rattle in time with the engine when driving which made me think I had problems with the transfer box but figured it out today when I put the storage box in between the 2 seats a longer bolt was touching the top of the handbrake cable was all it was.