I just had a rebuilt transmission and new converter installed two months ago with no problems. I installed a Troyer cooler, ran it for two days with no problem, went out-of-town and didn't drive the truck for a week. When I returned,the first time I put it in drive it slipped for about 7 seconds then ran fine and has for the last two days. Because of some loss when installing the cooler I had to add half a quart of fluid and noticed that the fluid smelled a little burnt.

1) Did letting the truck sit for a week after installing the cooler with the fluid a half quart low cause the slippage?
2)Did that little bit of slippage cause the burnt smell?
3)Did operating the truck on and off for approx. four hours before adding fluid cause the burnt smell?
4)Could the slippage and slight burnt smell be unrelated to the cooler install?
5)Is there a brake-in process that might cause the burnt smell?

Sorry, about all the questions and I'm sure there's other possible causes, but it's the only way I can express my suspicions.

I'd greatly appreciate any input,
Tom

 

Look over the cooler lines installation. Be sure it's in right and not stopping/impeding the fluid flow.
Burnt fluid is not a good sign, so soon.

 

Thanks bluegrass,
I double checked my installation and I don't see any problems. I installed the cooler in front and on the upper passenger side of the a/c condenser. Troyer states that you can mount the cooler in any position, so I mounted it with the inlet and outlet up. I did this so the fluid would remain in the cooler and not drain back to the transmission creating air in the line that had to be pushed out at start-up. I tapped into the hard line returning to the transmission from the radiator outlet by cutting the line then double flared each end, then slipped the hoses over the flare using hose clamps to complete the connection.

I also installed a B&M temp gauge prior to installing the cooler. I installed it in the hard line that runs from the transmission to the inlet on the radiator. I never saw the temp rise over 160 and since installing the cooler, over 150. I can tell it's working because before I installed the cooler it ran about 150 on the highway and after installing, it drops to around 120. I haven't towed my boat yet and I expect higher temps when I do, but everything seems to be working properly.

As for the burnt smell, I checked it today by comparing the smell to what was left in the empty fluid bottle and it smells the same. My concern is the slipping after the truck set for a week. Is this normal or could it be air in the cooler line which I tried to avoid by my installation? Could air in the line cause this slipping, if not what would?
Thanks,
Tom

 

My opinion is the cooler installation should not be a cause of slipping, directly.
The fluid is pumped under pressure to the radiator, through your cooler and back to the pan where the pump picks it up through the filter out of the pan.
Air should never be a problem no matter how the cooler is mounted.
Slipping is more a low fluid level or a fault with the trans operation.
If it continues, I would at least take the pan down and see if the pick up some how is not in place well and causing poor fluid pick up by sucking air.
Otherwise you just have a coincidence with the trans having a fault at the same time installing a cooler.

 

Bluegrass, you answered my next question about how the fluid is pumped and picked up. That eliminates the cooler and as for the fluid being low, it was at the bottom portion of the cross hatches when I added half a quart. I think it would have to be a lot lower than that not to pick up fluid. It must be in the pick-up. Other than the pick-up, is there any type of check valve that keeps the fluid from draining out of the valve body over extended periods?

 

There is absolutely NO way the cooler could cause what you are describing..
None..0..Nilch...

 

My be some dirt in the tranny from the rebuild, the valve body is a very tempermental unit, After 500 mile replace the filter and fluid if it operatate ok be happy if not have the tranny shop run a pressure test, there should be a warranty if a shop did it... Did they replace the pump???

 

Bob, the first thing the shop owner said when I took it in, was that the pump was bad. So, I'd think it was replaced, but help me understand about transmission pumps. Are they gear pumps or some other type of positive displacement pump? Is it part of the transmission? The reason I ask is, that a rebuilt unit off the shelf was installed and I haven't asked what was wrong with mine. However, I will ask when I take it back, it's under warranty.
Thanks,
Tom

 

4r70w pumps are positive displacement, the old aod were gear.
Alan