I was wondering if anyone has replaced a rear diff assembly before in here i notice alot ppl have questions about Fluid changes , but anyway i have a 1991 V6 4 Runner Yota , not really sure what size the rear diff is but it makes alot of noise , when the gas pedal is released, yes the fluid level is good, i have another 4 runner in the back yard for parts , not sure what size the rear diff on it is i plan to swap it out right into my 1991 , I have purchased a service manual for it but i notice the rear diff replacement section is not that detailed it basically says to disconnect driveshaft and both rear axles , then the diff housing bolts , does it simpily just come out after that any one with info please post thanks