gear ratios advice

Ok so while stripping down my blue rebuild, noticed I have the lt85 gearbox..... I hoped for lt75 but I guess I'm out of luck these days!

So trying to decide....

Do I go lt85 with 1.410 disco transfer giving me 2100 rpm at 50.... Wastgate is adjusted and fuel adjusted so pulls from the bottom anyway

Or should I source a lt75 with 1.410 giving me 2000 rpm at 50?

What are you guys running?

I do about 200 miles of driving a day, mix of motorway and town. Economy is important

I don't tow often but when I do its normally a dead car of some description and I'd like to be able to tow a trailer at decent speed (65 would be nice)

Might be after a gearbox dependant on the outcome of this!

I would say as other's have chose and say LT77 and 1.2 Disco tranny but if it will fit thinking of an R380 with 1.2 Disco tranny but not sure

i would so that you must have an immaculate fender if all thats bothering you is it over revving by 100 revs at 50mph

mick the builder said:

i would so that you must have an immaculate fender if all thats bothering you is it over revving by 100 revs at 50mph

Click to expand...

It will be when I have finished building it :-D

And the lt77 with 1.2 vs 1.4 will make more than 100 rpm difference? Or is it just late and I'm confusing myself :-S

And 100 rpm for 200 miles a day 6 days a week will save me a few bob in fuel!

I wonder if I can fathom the maths there.... Lol

I have an LT77 with 1.2 disco tbox and I sit at 3000 revs at 50mph...