Outer Limits 4x4 Board

I've been doing the search thing with partial results, I bought sj51 LWB 88 mod, and it appears that it has two different diff ratio's, I wish to know
1) the rear diff removed 11 pinion teeth 43 crown wheel teeth,What ratio is it
2) have another 11 pinion 45 crown What ratio.
I have swapped the rear as it was noisey with the 11/45 but still have the same problem,skidding wheel when in 4wd. I also have a front 11/43 from coily, and some other diffs unknown as yet. Any idea's what my front ratio could be? I will be checking other diff hopefully on weekend, would prefer not to have to do front diff if possible.
If I jack up car so as one front wheel off ground and the rear on the same side off ground,two turns tailshaft almost one turn with the 11/45 a bit over one turn with the 11/43 which was in it at the start and the front does approx 1 1/8 of a turn

43/11= 3.9
45/11= 4.09

To get the ratio, grab a calculator and divide number of crownwheel teeth by the number of pinion teeth.

However, I'm not good with model variants.

If it's a Narrow track, it should have a 3.9 diff ratio.
If it's wide track, it should have a 3.7 diff ratio
Coil sierras also have a 3.9 diff ratio
Jimny's are 4.09

A front coil sierra diff will will not fit your axlehousing.

My guess is your front ratio is 3.7:1 - that's the most obvious - 4.09 in the back diff and 3.7 in the front diff will give you 1.105 turns on the front vs 1 turn in the back. That's pretty close to 1.125, which is 1 and 1/8.

If that's true, you have a pretty funny mix - you actually have JIMNY rear and WT Sierra front. You'd need to find another jimny rear to go in the front. Depending on your tyre size and transfer gearing, that's not a bad outcome though.

Steve.

the 43/11 is a 3.9 centre

the 45/11 is a 4.1 centre..

just divide your ring y your pinion.The 3.9 is nt i believe and some maruti's had the 4.1????anyone else if im wrong
OH BUGGER STEVE WROTE TWICE AS MUCH AS ME AND STILL BEAT ME ignore my post


matt

Thanks guy's so will a coily rear fit my housing ?Also I had to change the pinion flange to fit the 4.1 that I just put in

if you where able to change the pinion flange to fit the 4.1, it has to be a jimny not a maruti centre. yes the coily rear will fit in your housing but at 3.9 do you want it to? sounds like it its the front diff that needs to be changed, or get a 3.7 rear to see if it matches the front. i'd be inclined to pull the front out and count the teeth. bit of mucking around but will take all the guess work out of it and may be quicker in the long run

I changed the tailshaft end to suit the 4.1

Well you guy's were right, was a 3.7 in the front,now replaced with the 4.1 and 4wd all good. Many thanks