Lt77 Gearbox

1. Lt77 Transmission For Sale
2. Lt77 Gearbox Ratios
3. Lt77 Gearbox Seals
4. Lt77 Gearbox Rebuild
5. Lt77 Gearbox Numbers

The 3 Speed GM180 Automatic Transmission and the 5 Speed LT77 Manual Gearbox were fitted to the automatic and manual versions of the Series II Rover SD1. In both cases they are considered to be very robust units providing routine maintenance guidelines are observed.

TWS LT77 Transmission metal oil pump gear kit - TR8/TR7 $89.00 $79.00 Bellhousing - Rover V8 to LT77/R380 Gearbox - New $499.00 $439.99 Hood Buffers TR7 TR8 $14.23. When you let go of the gearstick on either the LT77 or the R 380 Discovery boxes the stick will spring to the 3 / 4th gate. This gate position is set by the position of the bias plate. This gate position must be adjusted correctly to agree with the selectors in the gearbox to ensure a good gearshift.

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Unfortunately as the age of our cars increased and ownership began to fall into the hands of enthusiasts not seeking dealership servicing, like all mechanical components they start to give problems if maintenance is overlooked.

During my ownership of four Rover SD1's I have come across a number of routine and difficult fault situations that needed solutions. It’s fair to say that most elements of this essay are the result of original thought (not to say other people hadn’t thought of them too) but I had not previously come across them.

Frequently we are reminded - 'Top up the gearbox'. It's easy to say, isn't it? Not so frequently we are reminded - 'Drain the gearbox ---, etc' and don’t they both fill your head with dark thoughts?

Here then are some ideas to make things easier and few other snippets I have come up with, including a really radical treatment for a badly behaved 5 Speed LT77 Manual Gearbox. Read or download the PDF fromhere:(36kb)

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Land Rover Gear Box FAQ

This page has been set up as a reference source for gear sets thathave beenused in Land Rover gearboxes. Data has come from a variety ofsources. It has not necessarily been cross checked and verified,so usethe information with the appropriate amount of discretion. Inother wordsdon't blame me if the gears you get don't fit. It you have somemore orbetter info., please let me know and I'llupdate thelist. Send any comments to my e-mail address: red90 ampersandred90.ca “Spam blocking, replaceampersand with @ and nospaces”

ManualGearboxes

MT82Manual Gearbox(GetragFord transmissions)

LT77/LT77SManual Gearbox

The LT77 gearbox was used from 1983 to 1989 on 90/110s with 4cylinderengines and 1990/91 on all 90/110s. LT77S were used all allDiscoverys to1993 and90/110s during 1992/93. All of these boxes use a separatetransfer casecalled the LT230 which is mounted directly onto the output flange ofthegearbox. The '77' refers to the centerline spacing in mmbetween the mainshaft and the layshaft. Reverse is to the left and up.

Strength and suffix information courtesy ofAshcroft Transmissions:The LT 77 was introduced to the Landrover range in approx 1983 with the suffix Dbox andwas developed over the years to the suffix H which was last used in1994.The D and E are very similar theonlydifference being the reverse gear was a little fatter in the E. Whenthey wentfrom E to F larger layshaft bearings wereused.The G was further improved by allthe gearteeth including the pinion getting approx 20% thicker. Also a muchwider pumpwas used to increase the lubrication and cope with the fact that someof the LT77's were now being supplied oil cooled, ieV8NAS 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 ofstrength butused a different syncro set up called the'Double Syncro', In reality it didn’twork much better.

R380 Manual Gearbox

Updated information on 2005/01/22 from Ashcroft Transmissions

The R380 gearbox was used from 1994 to 2006 on Defenders and Discoverys. All of these boxes use aseparatetransfer case called the LT230 which is mounted directly onto theoutput flangeof the gearbox. Reverse is to the right and down. This boxwasbrought in as a replacement for the LT77S. It is noted to besmoothershifting than its predecessor.

Strength and suffix information courtesy ofAshcroft Transmissions:The R 380 was introduced in 1994 with thesuffix J which was a significant improvement on the LT 77 it supercedes, differences included a steel oilpump (asopposed to the LT 77 fibre one), anadditional 2support bearings were used on the layshaftand the mainshaft, wider gears, biggerdiameter syncrorings, syncromesh on reverse and a longer mainshaftspline.This suffix J did unfortunately have a coupleof design flaws which gave the R 380 some bad press, they were prone tothe mainshaft shearing across the oil feedholes, the layshaft also sheared at astress concentration behind thesandwich plate causing loss of 5th and reverse also early ones stillsufferedfrom mainshaft wear until the crossdrilled transfercase gears became fitted as standard on the suffix G transfer cases.In 1999 the suffix K was used very brieflyfor a few months then came the suffix L that is used currently. The Jand L arevery different, 2 of the bearings were substantially upratedand pinion and layshaft teeth were widenedagain, this results in a much stronger unit.

LT85 Manual Gearbox

The LT85 gearbox was used from 1984 to 1991 on 90/110s with V8s and1986 onfor Isuzu diesels. All of these boxes use a separate transfercase calledthe LT230 which is mounted directly onto the output flange of thegearbox. This is normally referred to as the 'Santana' gearbox as it was usedon Santana Land Rovers.

LT95 Manual Gearbox

The LT95 gearbox was used from 1969 to 1983 on Range Rovers, all101s, StageIs and 90/110s with V8s in 1983/84 and 1985 with Isuzu diesels. All ofthese boxes use an integral transfer case. The transfer case is a'full time' units with a lockable,mechanical differential. The differential is locked via a vacuumactuator. Overdrives are available that mount off of the PTOflange andreplace the transfer case input gear. Note that the gearbox andtransfercase use separate sumps. See the transfercasesection for information on transfer case ratios.

Series Gearboxes

Lt77 Transmission For Sale

AutomaticGearboxes
ZF4HP22 Automatic Gearbox

TransferCases
LT230 Transfer Case

The LT230 is an all gear transfer case. It has been used onallDefenders, Discoverys, pre' 1989 RangeRovers and90/110s with LT77/LT77S/LT85/R380/ZF4HP22 gearboxes. The transfer caseis a'full time' unit with a lockable, mechanical differential. Thedifferential is locked via a mechanical linkage through a spring insidethebox. Overdrives and underdrives areavailablethat mount off of the PTO flange and replace the transfer case inputgear. The gear set is comprised of 4 pieces:

·LT230Gear Set
LT230 Gear Part Numbers

Lt77 Gearbox Ratios

Lt77 Gearbox Seals

LT95 (Transfer Case section)

Lt77 Gearbox Rebuild

Lt77 Gearbox Numbers

All LT95 transfer gears are interchangeable. They canbe changed with the gearbox on the vehicle.