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LT77

£445.00

Product Information

 

Please note that, due to parts availability, we are currently unable to offer the LT77 Defender suffix G or H gearboxes.  As an alternative you could consider upgrading to the direct fit R380 replacement.

This section covers the LT77 and the later LT77S as used between approx 1982 to 1994.


There are many different types of LT77 used in the Landrover range, the first ones were used in about 1983, these were the suffix D (last digit of the serial number) and were the weakest type. The LT77 was developed through to the suffix H LT77S and was last used in 1994, please have a look at the related "technical information" section for further information on this progression.

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Video of a LT77 being built.
 

What they arrive with :

The manual boxes can be catagorised as "Long Stick" as fitted to the Defender and "Short Stick" as fitted to the Disco.
If your serial number starts with any of the following then you have a longstick : 50A, 51A, 52A, 56A, 60A, 61A.
If your serial number starts with any of the following then you have a shortstick : 53A, 54A, 55A, 57A, 59A, 63A.
The longstick boxes come with the top casting that the gearlever and turret bolt to but you will need to remove the following from the old unit : the bellhousing and dowels, transfer case dowels, gearlever and turret and diff lock pivot bolt if fitted.

The shortstick boxes come with remote top assembly with reverse switch fitted but you will need to swap over the bellhousing & dowels, transfer case dowels, extension gearstick and diff lock pivot bolt.


Videos to show what each type of LT77 comes with.

Long Stick

Short Stick

Video to show where to find the LT77 serial number.

 

 

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Sorry we are unable to collect from customers outside of the UK.

Product Code: LT77

Technical Information / FAQ's » (Click to Expand Collapse)

 

LT77 Development

The LT77 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 LT77'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 synchro set up called the'Double Synchro', In reality it didn't work much better.

Upgrades to the R 380

Should the LT77 fail on your vehicle you will usually have the opportunity to replace it with a later R 380, unfortunately surcharges will apply but if you are either planning to keep the vehicle, working it hard for a living or going on an overland trip where both reliability and the facility to add an oil cooler are important then this additional expenditure may well be worthwhile.

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