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Transfer cases
Posted: Thu Jul 09, 2009 8:08 pm
by rangie85
Hey guys,
I have an 83 RR with a 3 speed auto. I understand I have either an LT230L or an LT230R transfer case. What is the differents between the 2 if any? And will this transfer case bolt strait onto a RR 5 speed manual gear box out of an 1986 model? Or is it different?
Just asking because i'll be doing a manual conversion shortly..
Cheers guys.
Luke
Posted: Thu Jul 09, 2009 8:28 pm
by Loanrangie
You have an LT230R, R signifies roller bearing as oposed to later 230T's which use tapered rollers. You can bolt up an LT77 or R380 spd, the 230R also has the highest high range gear of all landys at 1.003/1, others have 1.22/1 or in defenders 1.4/1 . A ZF 4spd auto will also bolt up.
Posted: Thu Jul 09, 2009 8:38 pm
by ISUZUROVER
Loanrangie wrote:You have an LT230R, R signifies roller bearing as oposed to later 230T's which use tapered rollers. You can bolt up an LT77 or R380 spd, the 230R also has the highest high range gear of all landys at 1.003/1, others have 1.22/1 or in defenders 1.4/1 . A ZF 4spd auto will also bolt up.
Great info, however to be pedantic for a minute, 0.998:1 LT95 was the highest high range.
110 countys with isuzu diesel had a 1.003:1 LT230T from 1985-on.
gear box
Posted: Thu Jul 09, 2009 8:38 pm
by rangie85
Thanks mate, so is the LT77 a strong enough box or should i look harder for a 4 speed?
Cheers
Re: gear box
Posted: Thu Jul 09, 2009 8:44 pm
by ISUZUROVER
rangie85 wrote:Thanks mate, so is the LT77 a strong enough box or should i look harder for a 4 speed?
Cheers
The LT77 isn't the world's strongest box, but they will last OK in a rangie if you look after it. 5th gear is weak and has oiling issues. Run good quality oil like syntrans, never labour it or accelerate hard in 5th, and it should last fine.
Also add an oil feed tube to the t-case PTO cover if you don't have a cross-drilled input gear.
Posted: Fri Jul 10, 2009 5:45 am
by red90
One LT77 is not the same as the next. The early suffix boxes are not very strong. Later ones are as strong as an R380.
http://www.ashcroft-transmissions.co.uk/part_1.html#pa1
The LT 77 was introduced to the Landrover range in approx 1983 with the suffix D box and was developed over the years to the suffix H which was last used in 1994.
The D and E are very similar the only difference being the reverse gear was a little fatter in the E,
When they went from E to F larger layshaft bearings were used.
The G was further improved by all the gear teeth including the pinion getting approx 20% thicker. Also a much wider pump was used to increase the lubrication and cope with the fact that some of the LT 77"s were now being supplied oil cooled, ie V8 NAS 90, 3.9 RR Classic and the 3.5 EFI Discos.
The H (termed the LT 77S) was the same as the G in terms of strength but used a different syncro set up called the "Double Syncro", In reality it didn"t work much better.
Posted: Fri Jul 10, 2009 12:14 pm
by Loanrangie
ISUZUROVER wrote:Loanrangie wrote:You have an LT230R, R signifies roller bearing as oposed to later 230T's which use tapered rollers. You can bolt up an LT77 or R380 spd, the 230R also has the highest high range gear of all landys at 1.003/1, others have 1.22/1 or in defenders 1.4/1 . A ZF 4spd auto will also bolt up.
Great info, however to be pedantic for a minute, 0.998:1 LT95 was the highest high range.
110 countys with isuzu diesel had a 1.003:1 LT230T from 1985-on.
I WAS ONLY REFERRING TO LT230'S
Posted: Fri Jul 10, 2009 3:45 pm
by nottie
Dont the LT230s use different adapters for a Auto and a Manuel As well is input shafts??
Oh and 3 speed auto uses a different one again compared to a ZF??
Posted: Fri Jul 10, 2009 4:13 pm
by subaman
I have put an lt230 from a manual disco and bolted it straight up to a zf on a rangie. So I dont think there is any different mounts as far as that is concerned.
Posted: Sat Jul 11, 2009 12:08 am
by Loanrangie
nottie wrote:Dont the LT230s use different adapters for a Auto and a Manuel As well is input shafts??
Oh and 3 speed auto uses a different one again compared to a ZF??
Adapter is just the extension housing of the box and yes TF727 and ZF use a different spud shaft but otherwise all will interchange.
Posted: Sat Jul 11, 2009 11:14 am
by cloughy
ISUZUROVER wrote:Loanrangie wrote:You have an LT230R, R signifies roller bearing as oposed to later 230T's which use tapered rollers. You can bolt up an LT77 or R380 spd, the 230R also has the highest high range gear of all landys at 1.003/1, others have 1.22/1 or in defenders 1.4/1 . A ZF 4spd auto will also bolt up.
Great info, however to be pedantic for a minute, 0.998:1 LT95 was the highest high range.
110 countys with isuzu diesel had a 1.003:1 LT230T from 1985-on.
Great info, however to be pedantic for a minute, 0.996:1 is the highest high range
Posted: Sat Jul 11, 2009 12:25 pm
by nottie
OK then i have a transfer here with a completly diffrent looking adapter housing and spud shaft that i cannot identify. The shaft is about 50mm longer and has a bigger input spline cut into it that wont fit any rover output splines that i have here. Ill try get some pics up as someone may identify it.
It certainly looks like a gearbox adapter and not an auto adapter though.