Quote:
Originally Posted by jgue467
Great info - thanks for posting. Overall its still about avoiding High trans fluid temps.
So besides proper OCI (is 30K the general consensus for a drain/fill?), using OD override when climbing hills/mountain passes and/or towing, perhaps using auxiliary cooling, we also need to remember to use Lo on slow steep climbs, slow yet steady maneuvers and such. I don't do much of the last, yet will use Lo more often from now on.
Also on the 01-02s you can start in 2nd gear to avoid the 1-2 shift jolt if you're planning on going that 'fast'. Luck all.
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I think a drain and refill every 30k is insufficient. You're only draining out a 1/3 of the capacity, around 4-4.5 quarts of a 12 quart system. This means you're exchanging out 12 quarts every 90k miles.
I do a drain and refill of the pan every other engine oil change or approximately every 10k miles. Why? Because with the way I drive my rig, and with how heavy it is, I'm running higher temps even with a decent size trans cooler. As the temperature of the fluid goes up, the effective life of the fluid goes down. I want to give my trans the best chance at a long life and doing regular drain and refills is the best insurance to achieve that.
If you drive the flat lands for the most part using your rig as a grocery-getter, your trans fluid could last you 100k miles. For anyone who drives a lot in the mountains and/or goes 4wheeling, your trans fluid is not going to last anywhere near 100k, more like 15-30k.
Drain and refills are a dilution process, but it's a very effective way to keep your trans fluid in great shape. I'd rather do regular drain and refills than wait a longer interval and do a full flush/exchange.