Originally Posted By: Spawne32
Originally Posted By: MetalSlug
Back when I own a mustang, I put in RP for transmission and rear end, 1k miles later it having problem shifting, I take to ford and they drain the transmission and it look like water. I search the mustang forum and some have same problem fluid come out like water. ford put wat ever in it and it shift right again, I drain the rear end and put in mobil 1. Never use rp again. Mabe work for other, just not me -_-
The RP might have not been the right grade or the right additive package for your particular rear end, not all fluids work with all rear ends, people mess this up constantly. Additive packages play a huge part in how the rear end holds up. As far as the trans, depends on what mustang you have you might have actually required automatic transmission fluid and used the wrong fluid or something. Ive never had an issue with RP oil or transmission fluid, and their oil made a world of difference in my friends mustang.
Back then I shop everything from americanmuscle.com, I think the max gear is for rear end and Synchromax for the 5 speed. When I pour in , it kinda purple, when the ford dealer drain it, it look like water.