My diffs are incredibly rusty. I mentioned that they are so rusty that the MOT guy mentioned them but I already was aware that they are really rusty. I am talking about flakes of metal falling off them when you touch them slightly, so badly that you cannot be underneath them as your eyes fill up with metal. Large chunks and small chunks. Really really rusty. I do not need an MOT guy to tell me that, I can see it with my own eyes.Have you got any mechanical knowledge at all? An MoT tester saying a diff is rusty just sounds like a poor dodgy MoT tester tbh.
The ratio change you are proposing is HUGE, have you bothered to use a gearing calculator to see what the actual impact would be?
Why on Earth do you think running at higher revs in its current state would be bad anyway? It already has pretty long tall gearing, just go and look at how most high revving 4 cylinder cars are geared.
Are you 100% sure the diffs didn't change in any other way during production? Are they 100% a direct swap over? Not saying they aren't, I don't know. But the L322 was built for many years and changed a lot in that time.
Please do not compare four-cylinder engines to a 23 year-old V8 engine that was actually designed years earlier before it came to the Range Rover. It is about the RPM that the engine runs at compared to its top RPM.
I had a motorbike that would rev to 11,000 RPM but who cares? I am talking about a 2002 petrol 4.4 L V8 Range Rover. And yes I have years of experience working on cars which is why I am talking about changing over the diffs on a forum, to reduce the RPM.
I am not sure if the diffs did not change over time, which is part of the reason that I am posting this comment here. They seem to be the same based on every visual information that I have from looking at the two different diffs on the Gentlemen of Salvage website.
I was hoping that someone with more knowledge than me would be able to answer that question as opposed to someone without knowledge throwing out opinions.
As for the gear ratios, since nothing else would change in the drive train it is a simple ratio of 3.73 / 2.76. That is a 74% difference so if it was reving at 1,500 it would now rev at 1,500 x 74% =1,110. It's not complicated.
(I see that I typed 1,300 rpm before when I should have typed 1,500 rpm, sorry.)