Transmission problem

[Fanatic1074]

Hey guys im about to to do a motor rebuild because of low compression at the rings. The transmission on this truck has been doing some kind of rubbing/grinding sound when shifting from OD to a lower gear, like when im on the interstate and it needs a bit more power to go up a hill or pass someone.

However it only seems to do this at higher speeds. Could this be related to the engine having low compression? Or is this positively a Tranny issue?

If i need to fix the transmission, i want to do it while we have it out of the truck.

Thanks!

 

[FordandPolaris]

Best thing to do would be to pull the pan and see what it looks like on the inside. If it isn't immaculate, I would rebuild that as well.

 

[Fanatic1074]

Best thing to do would be to pull the pan and see what it looks like on the inside. If it isn't immaculate, I would rebuild that as well.

I did a pressure flush 10k ago and it looked like this...

https://dl.dropboxusercontent.com/u/92122299/CameraZOOM-20120217131358058.jpg

The guy who did the pressure flush said it was the cleanest tranny he had seen with that many miles on it.

 

[Fanatic1074]

Can any transmission experts at please comment on this. I have heard that simply draining the fluid and putting synthetic will fix it.

Thanks!

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[stamp11127]

How many miles are on the tranny?

If you rebuild or swap the engine change over to an external trans cooler or replace the radiator with a new one. Very few shops will tell you about changing the radiator after a trans rebuild. Had the internal trans cooler let go on a rebuild in the past, $1200 down the drain because of keeping the old radiator.

 

[Fanatic1074]

145k on the truck. Original trans.

So what happened to the trans cooler ? Plug up?

I can use my mityvac and run some fluid through it to check flow before I put the radiator back in

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[stamp11127]

Don't know the exact location of the leak but I had coolant and trans fluid mix. The only place that can happen is inside the radiator. Indication of trouble was the large white smoke billowing out from behind. Once I stopped it was pouring out of the transmission like it was coming out of a garden hose. Luckily I carry extra fluids when I travel and was able to make it back to Georgia by slightly overfilling the trans and relieving pressure on the cooling system. Dropped the pan after I got home and most of the clutch material was in it. Lasted about a month after that. A $200 radiator is cheap insurance.

 

[Fanatic1074]

Damn. Yea very good point. Ok well I guess I'm going to order a radiator.

Thanks for the input!

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