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#Post#: 88398--------------------------------------------------
2.5 n/a, Range Rover diffs?
DIR By: Violet Vivid
Date: May 20, 2014, 6:20 am
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Heya All!
With my daily driver (Hillman Imp) being smashed into I'm
looking to press my 88" 2.5 n/a diesel into daily service, if
not immediately (got the family 110 :gay: once the hire car
goes back) but maybe around November I'm considering upgrades to
make her a bit more suitable, purely because I do motorway
drives every other weekend.
Now I cannot justify a tdi, as the engine is a good one, and
she'll cruise at 55-60mph already.
What I'm thinking is a overdrive, naturally.
But would it also be worth fitting range rover diffs?
xXx
#Post#: 88400--------------------------------------------------
Re: 2.5 n/a, Range Rover diffs?
DIR By: tonyg
Date: May 20, 2014, 7:39 am
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I used to 'commute' from Nottingham to Yorkshire Dales in a 109
diesel. I had rangey axles fitted on leafs ..... it was a
nightmare! I spent most of my time on M1 in 3rd gear with trucks
passing me. I really wouldnt recomend going down the diff route.
Knocks the crap out of your clutch too... I believe auld P5
rover diffs are inbetween 4.7 of the landy and 3.54 of the
rangey. Might be a better bet.
T
#Post#: 88410--------------------------------------------------
Re: 2.5 n/a, Range Rover diffs?
DIR By: Roveerman
Date: May 20, 2014, 11:03 am
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Recivied wisdom is not to fit strange rover diffs into standard
engined land rovers, not having enough grunt for the higher
ratio you will struggle to maintain speed on anything but a good
downhill.
Overdrive is the best bet but finding one that won't scream it's
nuts off WILL be hard and costly. I don't know if the roverdrive
is still available, supposed to be stronger and quieter, but if
it it's it was over a grand last time I looked, this leaves
rover car diffs with a ratio of about 4.1:1 these are around but
you will need a pair (the cars only had one each :wink: ) and
they both need to be good un's.
The choice is yours and comes down to hearing loss, wallet and
sanity, good luck :thumbs:
#Post#: 88412--------------------------------------------------
Re: 2.5 n/a, Range Rover diffs?
DIR By: divie
Date: May 20, 2014, 11:49 am
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Been there and tried the rangie diffs on a 88" 2.25 doozle. Soon
went back to 4.7s You need a TDI or strong petrol engine to pull
tall diffs. If you must try it just change the rear diff and run
for a couple of months to try out. Just dont get putting it in
4wd.
#Post#: 88547--------------------------------------------------
Re: 2.5 n/a, Range Rover diffs?
DIR By: Matthew
Date: May 25, 2014, 9:24 am
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There are inexpensive rebuild kits available now to cure the
screaming symptoms of knackered Fairey units - and what with the
Roverdrive having knocked the bottom out of Fairey prices, you
should be able to find a slightly shagged one cheaply enough now
#Post#: 88562--------------------------------------------------
Re: 2.5 n/a, Range Rover diffs?
DIR By: nickjaxe
Date: May 25, 2014, 2:57 pm
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As stated...depends what engine you have....2.25d forget
it...2.25p maybe ok...I run a 200 di...no turbo...supposed to be
similar to a petrols output and its fine...I start in 2nd most
of the time,
I ran an o/d from 1975till about 3 years ago when I fitted my
200...so glad be away from its noise and constantly having to
check its oil level,
The diffs give more or less the same ratio...easy to fit but
maybe other thing to modifie such as diff oil filler holes and
the speedo under reads by around 25%...I just took the glass off
mine and put white dots of paint for every 10mph of the correct
speed,
The have got to be the 10 or is it 11 spline type I can never
remember...anyway its not 24 as per the later type,
Sorry I see you have a 2.5na...if its as powerful as a petrol
should be ok...you could always give it a quick test by just
fitting a rear diff and take off the front prop if no FWHs
Nick.
#Post#: 88796--------------------------------------------------
Re: 2.5 n/a, Range Rover diffs?
DIR By: NoelC
Date: May 31, 2014, 2:54 pm
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I would say not to go with 3.54 diffs with any of the pre-Tdi
engines in a series. I've got a 2.5 petrol with stage 2 head in
the 88 and granted it's on bigger 255/85R16s but even on
standard 750s I'd reckon it to be fairly unpleasant on 3.54
diffs. It has a Roverdrive and effectively it's the same as
leaving that engaged all the time, I've tried it and it's
horrible.
BTW Rocky Mountain still make overdrives but due to someone
getting arsey about them calling it a "Roverdrive" it's now
branded a "Roamerdrive". Yes, they are quieter. I've had mine
for over 10 years now. It's not been faultless, but is better
than a Fairey all things considered.
#Post#: 88997--------------------------------------------------
Re: 2.5 n/a, Range Rover diffs?
DIR By: puddlejumper
Date: June 5, 2014, 1:47 am
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2.5 NA with ranger diffs is a no no for me, it might be ok(ish)
on an 88 with small tyres but it would be very marginal, mine 88
with 750 tyres wouldn't pull the skin off a rice pudding when it
had the ranger diffs in so back to series diffs and it goes
great now with the 750 tyres
Doug
#Post#: 89002--------------------------------------------------
Re: 2.5 n/a, Range Rover diffs?
DIR By: Arjan
Date: June 5, 2014, 4:15 am
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I can only suggest to forget the RR Diffs.
I had them on the 88 with a 2.5 N/A and it just doesn't work. I
drove a 200 Tdi 109 with them and it sort of was ok. But you
loose a lot of low down torque - and in low box you are going
faster than you'd want.
Don't do it.
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