How often do you guys change your tranny fluid and rear diff fluid?
My tranny fluid looks fine after I got it rebuild about 15K miles ago. I haven't changed the fluid and it looks fine! Smells and doesn't seem that it needs a change.
About 1000 miles ago I got a SLP take-off torsen posi unit installed, the torsen doesn't have a clutch so.....
Thanks guys

 

Tranny - 15K or 2 years, whichever comes first. I just use Havoline Dexron III in everything. New filter each time as well.

Rear - 30K, Mobil 1 75W-90

I'm really ****, I guess.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley module, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Streetdampr, Ruger P95DC, hot wife, new oil filter, !cats, !TBC, !AIR.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

If you monitor your fluid (check it once a week or after any heavy duty driving) and the fluid retains the color & smell from the beginning, you could go for years or just weeks depending on "how you drive". Always run an external trans cooler. Do not think that you will get it to run too cool. Been in the trans business going on 25 years, still looking for my first one that ran "too cool".

 

2 years or 24,000miles, this is the best to go by

 

Rear.. every 15,000miles or gear ratio change

Trans 15,000miles on the daily,
once a yearon the Z, provided it looks good the whole time.

 

I'm with Pro Built. The intervals for maintenance on a vehicle that is driven hard do not conform to any one standard. The individual fluids need to be monitored and changed when they show signs of needing to be changed, ie smell change, color change, contaminent build up, etc.....

As an example for the trans: I drive my car pretty hard and it has a stall in it (and a big cooler). I have only owned this car since April and I have changed the filter twice and dropped and replaced the fluid two other times on top of that (I installed a drain plug on the pan...). ATF is cheap in the big picture.......

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1987 GTA L98 MD8
355, TFS Heads, LT4 Hot Cam
My GTA

The Minnesota F-body Club