khouse

[khouse]

I got a 2001 AC SR5 V8 with 79200 miles. The truck has given me no problems I just recently had the two front O2 sensors replaced because of check engine light and that was done under the enhancement warranty. I was curious, last time the dealership changed transmission fluid but I would like to do this myself to save money. I am also going to change the rear differential oil but would like to know how much fluid and oil are required for a change. The owners manual says 2.1 Qts for the transmission but I heard its a little more and the differential oil says 4Qts of 75W/80W-90. I'm just curious if anyone has performed this and what they ran into.

Thanks,

[ThomasE]

Drain & refill of transmission is 4 qts. For rear differential, I don't recall exactly, but it's somewhere between 2-3 qts when I changed it a couple years ago. You just keep filling it until it comes out the fill hole.

[khouse]

Ok, thanks for the info.

[khouse]

Hey ThomasE, would you recommend using the synthetic in the rear and how about adding synthetic to the existing transmission fliuid. I've been running Mobil 1 synthetic in the engine for awhile. I was just curious if it made a difference in the rear diff. and the transmission.

Thanks,

[ThomasE]

I've been running Mobil 1 synthetic for engine, transmission, and rear differential. Since you have a 2001, the transmission calls for Dexron 3 or compatible, so the Mobil 1 works well, feels like it shifts smoother to me. For the rear diff, it runs cooler after I switched to synthetic. I put my hand on the diff after driving the same route home from work, before & after switch to synthetic and it's noticably cooler w/ synthetic. I know if you have a later model (like 2003? & later) you're not suppose to use synthetic in the diff because of seals but I've been using synthetic for probably 4 years now working great.

[woodfc]

Khouse,

If I remember correctly, a full transmission fluid change is around 8-10 quarts. I did this on my 00 several years ago and used synthetic fluid. Fluid cost was around $130 and instructions for a complete flush were in the technical and vehicle assistance forms. Synthetic tranny fluid made a big difference in shifting,smoothness and tranny temp but you need to do a full flush otherwise you have a mixture of fluids and will not get the full benifit.

[elrcastor]

if you have a rear LSD, make shure you get LSD fluid or an LSD additive