Help! Gearbox Oil Change, now noisy!

Ok, so I think I'm going to head to LR tomorrow to get some MTF94, but just want to pass this across you guys first...

So I've just greased up all my propshafts with Rocol Sapphire 2 bearing grease, fine, then I changed the gearbox oil out for Redline MTL 75w80 gear oil, as it comes highly recommended by a lot of people on many forums.

Before the oil change the car ran sweetly, quiet, bit of diff whine from the front diff but that was made much better by switching the oil out to Fuchs Titan stuff.

I jacked the front up off the pumpkin to level the car, then drained the old oil out. This came out crystal clear with only a slight amount of metallic sludge on the magnetic pickup. Filled up to the level with Redline using a pesticide pump spray from Homebase, and went for a drive. Great at first, slick changes, 1st to 2nd was maybe 5% better than before, but it was damn good anyway.

Then I jumped on the dual carriageway and all of a sudden got quite a loud whine coming through the cabin that carried on quite loud down to about 25mph. Pulled straight off and crept home slowly, about 2 miles.

Double checked levels, all good, so what do you guys think could have happened?

One thought that nay be pertinent, I don't know, is that I had to pry off the grease gun from the nipple on the rear-most UJ with a small screw driver as it would not come off... this couldn't have damaged anything could it?

I'm ****ting myself now, I'm driving to the Alps on Tuesday as me and the Mrs have started a ski chalet business, and I need the damn Land Rover to take our guests around resort!

grease gun wouldnt be an issue unless joint was buggered anyway, remove front prop and run in diff lock see if it makes a difference then do the same with rear

jamesmartin said:

grease gun wouldnt be an issue unless joint was buggered anyway, remove front prop and run in diff lock see if it makes a difference then do the same with rear

Click to expand...

Which it wasn't... Ok, will try that tomorrow.

Just to be clear, I will index both flanges on the prop and remove the 8 bolts, yes?

ok cool, thanks.

Any ideas on what "may" be the cause here?

Assuming you have a R380 gearbox, not sure about the gear oil you used - but that saidwouldn't expect it to cause suchnoise so quickly

I'd flush it out, replace with MTF94 and see if any better

So dropped the expensive Redline MTL and filled back up with MTF94 from LR Ascot.

Noise is now much improved but gearshift is back to what it was with the old stuff in, if not "slightly" worse... dunno. One thing is for sure, the Redline MTL makes shifts super sweet, and whether it was to blame for the very noisy box, or whether it was the front diff and it didn't like all the fresh new grease I gave the propshaft I don't know, I didn't remove the props to find out as I was just relieved that the noise is now 90% reduced.

Sometimes good old simple oil is the way to go, flash oil is fine in flash cars!