LT77 Gearing

wrickm · Apr 30, 2015

Can anyone here confirm for me whether or not MOD Lt77's have a different (lower) gearing than non-MOD units?

I seem to have lost 10mph of top speed after a transmission and transfer case swap.

fanatic · Apr 30, 2015

transfer box, check transfer box ratio and box suffix

wrickm · May 1, 2015

fanatic said:
transfer box, check transfer box ratio and box suffix

will do thanks for the lead.

top drive · May 1, 2015

test speed with GPS ? if its just the dash speedo reading thats different

Could simply be down to a different speedo gear in the speedo drive.

110s had different tires to 90s thus different speedo gear to correct the speedo.

not a hard job to change.

lynall · May 1, 2015

See here Ashcroft Transmissions - Ratio Calculator
Seems military spec 77 is lower top ratio than std 200 unit.
Look at your serial number to confirm

300bhp/ton · May 1, 2015

Some MoD 110's also use the 1.6 rather than 1.4:1 transfer box. This will mean lower mph per 1000rpm in top. But should make it a heck of a lot more peppy.

LT77 Gearing

wrickm

Active Member

fanatic

RESPECT IS EARNED, BEATINGS ARE FREE ;-)

wrickm

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top drive

Well-Known Member

lynall

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300bhp/ton

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