series to range rover diff swap

[Rob]

Good day.
Has anyone done a diff swap putting rr classic diffs in a series rover (non salisbury)? The "google" bible doesn't list alot of info but what I have found suggests it is not too tough (and has some speed advantages). One site suggests it is a straight "bolt-up" swap... can't be THAT easy... can it?

Thanks, Rob

83 88
88 RRC

[exmod110]

Unless u are running a v8 it will be a slug....it is a straight forward swap but is too large of a ratio change for a 2.25-2.5 to power down the road....
I dont recomend this kind of swap, had a 2.8 ford v6 in a 2a 88 and swaped in rr difs and killed all thaughts of performance even with 160 hp....had hard time to keep it in top gear and maintain speed highway speeds.. ended up with stock ratios and a fairy od and it worke out good...

[reefworld1]

Hi, I'm wondering what ratio diffs you were looking to go to? I'm looking at trying 3.54 with a 2.5 na diesel.

[tuko]

I, like Bill, had 3.54's from a Range Rover in my series landy.

For me, they were a great road going alternative to buying an overdrive. BUT, when it came to 4x4ing, I lost the use of 4Hi, it was simply geared too high. 4Lo had to used all the time.
Yes, we can argue, that the landy spends most of it's time on the road, but it's the legendary off-roadability, that I really wanted.

Earlier this year, I also, changed back to my 4.7's and managed to buy a used, reasonably priced Fairy Overdrive. Haven't looked back since. 8)

" One site suggests it is a straight "bolt-up" swap... can't be THAT easy... can it? "

Yes, it is Rob.
I may have even said that on my homepage to. :P



Todd.

[Rob]

The range rover diffs are the standard 3.54:1 (the series 3 is 4.7:1). It would give about a 33% reduction in RPM for the same speed with the new diffs (a bit higher than an over drive but can't be disengaged like an overdirve).

One site I found interesting was: http://users.mrbean.net.au/~rover/high. ... l%20Ratios.

I was considering the swap as I use my landy mostly for runs up and down the island highway (with occassional off-road use). I also happen to have a brand new RRC diff and another good "used" diff so it seeed like a cheap alternative to an overdirve.

I do appreciate Doughboy's warning though.... this rover is slow enough on the hills as is.

Rob

[exmod110]

also depending on tire size, u could get a more suitable tire size to reduce rpm, effectivly raising the ratio the taller the tire the lower the rpm at the same road speed, it all depends on what u want to do with ur truck.
juat an alternate choice....
Don