225

My truck for the last year has had the drive line clunk issue. I haven't really worried about it because I drive my truck about 500 miles a month.

Now, my transmission sometimes slips. Not a lot or a real noticeable slip, but it does. When the truck is driving in cruise control on the highway, I feel it "skipping" here and there.

Also, if I drive the truck 100 miles or more straight, when I slow down back to city driving, the transmission is real notchy and slips some ( from heat, I'm sure).

My question is, do I flush it, or just wait for it to go boom and replace it? When I flush it, I will do greasing of the slip yoke to fix the clunk.

I'm worried if I do the flush, the transmission slips even more.

The truck has 106k miles btw.


Thoughts?

Mod (Ret.)

Take it to a good transmission shop that uses a LOW PRESSURE flush process.

Its been discussed back and forth as to flushing or not with a high mileage transmission for its first flush. I've had 3 trucks purchased, all with over 100K when purchased. My local transmission shop inspects the truck (pan drop) before they recommend a flush. Then they use a low pressure process, and remove ALL the fluid.

A pan drop and filter only gets about 4 to 5 quarts; your transmission has much more then that (torque converter, valve housing, transmission cooler).

A pan drop and top off is better than nothing, and if you do that every 4 to 6 months, you may eventually get all the old fluid replaced with clean fluid with the needed additives that help prevent slippage.

650NutKase

This would be my recommendation. That way, you're not "shocking" the transmission with completely new fluid. Little by little, the old fluid will work its way out.

225

Thanks for the replies. I think I might just do a pan drop then and do it once a month for a while until I have all red fluid.

I work offshore and when I get off, I have to drive the truck 12 hours home. Usually I fly but this time I had to drive.

I think I'm going to do it before I leave. I have the tools in my truck to get it done.

650NutKase

Recommend getting this if you're going to drain regularly.
Mine's going on this weekend