lt77 gear ratios

shortysshaker · Post by **shortysshaker** » Wed May 22, 2013 9:19 pm

does anyone no the gear ratios on 1st 2nd 3rd 4th & 5th on a lt77 box witch I beleave is a Sherpa box id number 17A0009247D

sidecar · Post by **sidecar** » Wed May 22, 2013 9:46 pm

Dunno about your suffix but I don't think they differed too much anyway...

http://www.keirhague.com/gearboxes.html

DaveEFI · Post by **DaveEFI** » Wed May 22, 2013 10:33 pm

shortysshaker wrote:does anyone no the gear ratios on 1st 2nd 3rd 4th & 5th on a lt77 box witch I beleave is a Sherpa box id number 17A0009247D

I can give you the ratios for an SD1 box from the BL manual. Van boxes have wider spaced ratios, IIRC. If you have the box out of the vehicle, it's easy to work out the ratios.

softdash3.9 · Post by **softdash3.9** » Thu May 23, 2013 7:07 pm

G17A SD1 2300/2600 5 speed

shortysshaker · Post by **shortysshaker** » Thu May 23, 2013 9:53 pm

DaveEFI wrote:
shortysshaker wrote:does anyone no the gear ratios on 1st 2nd 3rd 4th & 5th on a lt77 box witch I beleave is a Sherpa box id number 17A0009247D
I can give you the ratios for an SD1 box from the BL manual. Van boxes have wider spaced ratios, IIRC. If you have the box out of the vehicle, it's easy to work out the ratios.

yes the box is out,how s the best way to work outthe ratios? thanks lee

DaveEFI · Post by **DaveEFI** » Thu May 23, 2013 10:41 pm

Mark the input and output shafts with Tippex or whatever. Count the number of turns for each one in each gear.
4th is direct, so both shafts will have the same number of turns.

Ist - if an SD1 box - will have 3.321 turns of the input shaft to one of the output shaft. A Sherpa box has 4. something - so easy to tell.

ChrisJC · Post by **ChrisJC** » Sat May 25, 2013 8:16 am

I mark the input and output shafts, and then turn / count both ends until both ends have made an exact whole number of turns.

So you might get 33 turns of the input to 10 turns of the output which would be a ratio of 3.3

Chris.

sidecar · Post by **sidecar** » Sat May 25, 2013 9:22 am

ChrisJC wrote:I mark the input and output shafts, and then turn / count both ends until both ends have made an exact whole number of turns.

So you might get 33 turns of the input to 10 turns of the output which would be a ratio of 3.3

Chris.

That's what I did with and old R380, it is much better than just doing one turn of the input shaft. It can 'do your head in' counting turns on two shaft, having a second person helps!

DaveEFI · Post by **DaveEFI** » Sat May 25, 2013 10:53 am

Do two columns (input and output) on a sheet of paper and put a tick on them each time the shafts pass zero.

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lt77 gear ratios

lt77 gear ratios

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