Suzuki Club UK

Hi there can anyone help me I recently bought a sj413 samuria for offroading . The engine has struggled a bit since I got it Ihave done all I can to the engine it still struggles so I thought I would check the diffs the front one is marked s or 5.726 on the crown gear and the rear is marked s or 5.794 can you help

I don't think those markings aren't the ratio but the pinion depth setting or something like that.

best way to tell is to count the teeth on both the ring and pinions to check that they are both the same!

Is it any better in 2wd?