Before jumping into 33's pudpudin mo muna ang gulong mo - which look like 30's or 31's . I think those are good enough for basic trailing na.
Once you go 33's magiiba na ang pull ng jeep mo...you will need either a body lift (less than P10k siguro) or a suspension lift (depends if you go branded...can go near P50k) and maybe a re-gear (unless your diffs are already geared low pang pang truck tires na lagpas 31". Si 199 offroad house sa maynila ang alam kong merun mga gear diffs for that upgrade purpose.
Sa talyer, wala na (di ko na alam saan lumipat ang shop) yung suki ko kasi - si Dayu and his brother Garo na memner the AC4 wheelers club. However, there are three shops na mapansin ko sa vicinity.
1) is in Magalang avenue, right side ng road before reaching Don Pepe Henson Avenue coming from Pandan rd. Are familiar with this road description? If not, take NLEX, exit ka sa Angeles and take the road going to Sto Rosario...yan yung Pandan Rd. From the rotonda ng Marquee mall, you will pass the bridge....then later on merun Y section ang road. Take the right, that's Magalang avenue na. Just go straight that road and later may madadaanan kang talyer sa left side na mostly 4x4s ang ginagawa.
2) next that I know is nasa Sto Rosario st. tumbok ng Sn Jose st. Have google map. Sila lang ang talyer sa Sto Rosario. Most of his clients are LC 40s. From Sto Rosario church lagpas ka na pag umabot ka sa Villa Angela Subd.
3) is in sn fernando after telabastagan area but before Sindalan (if i am not mistaken)... Name of shop owner is Obet. Try mong isearch sa :: 4x4 Philippines :: yung name na yun.