Gearing Q's

[83zook]

Im after christovers advice on diff ratio's into a 1 litre.
My question is if i put lj80 4.6 ratios into my 1ltr can i run 31's that read 30.51"?, because this is what im working off:

New tire size
old tire size x current gear ratio = New ratio

30.51
27.10 x 4.1 = 4.614831372549019

And with that being a bit lower than standard my 4 speed is going to be ringing its head off to do 100 Km/h
And will i still have to change the side gear between lj and sierra?, because you told me about the lj50 r&p you would have to change the side gears or put the r&p into the sierra centre, do lj80's have the same size axles in the back as a sierra does?
And i wanted to know have you got standard transfer? because i read somewhere on here that the 1.3 rockhoppers will fit into the 1ltr transfer! is that correct? btw i know you have lj50 4.9's
Sorry i rambled with so much sh*t but i've got lots of Q's and everyone i talk to either dont want to listen or dont know what in the hell im talking about!
Thanks
p.s What do you think of Sumitomo Sarengeti M/T because thats what im planning on putting on because there cheap enough and did pretty good in the 4WD monthly Muddie comparo!

[christover1]

There is some LJ80's with same rear axle size as Sierra, but very rare.
So putting the r&p onto Sierra centre is best way.
Front bolts straight in, so do what I did, try the ratio by fitting front only, and driving front wheel drive for a bit. (with rear tailshaft out)
This will tell you if its ok.
Mine is LJ50 diffs which is 4:9 and I run 31" measured tires. 32's.
Its a little low for highway cruising, but ok round town.

Some gearing kits will fit either 1.0litre or 1.3 cases with 4wd lights.
No gearing kits will fit older 1.0 litre t-cases.
I run an older 1, but mine came out with the newer 1.

Sumitomo Sarengeti M/T seem to work ok, have not seen many in action, but those who have them are happy with value and performance

Mines now fitted with a 1.3 eng and box. The 1.3 box is different gearing to the 1.0 box slightly.

1.0 litre engines work best when they rev a bit so in my opinion 4:6 would suit yours. For road use, mine would be better with 4:6 but I am very happy with it offroad.
But just buy 1 and see if you like it, then if you don't you haven't wasted anything.

christover

[christover1]

lj10.com is a great reource for LJ and 1.0 Sierra questions.
Thats where I got my info from.

http://www.lj10.com/forum/index.php?sid ... f80774d0d8

[83zook]

Thanks Christover thats a real help!