Its A4LD time again...

[e21pilot]

Thanks for the info. As part of this work, I am going to replace the rusty cooling lines between the transmission and the radiator. Does anyone know what the fittings I would need to both connect to the transmission and the radiator? It looks to me like the line thickness is bigger than 1/4" like maybe 5/16" or perhaps it is a metric thickness. I am going to try thin wall stainless tubing if it is not too hard for my bending and flaring tool.

 

[e21pilot]

I did some testing tonight on the local expressway and I can confirm that my A4LD will lock up the torque converter in the Drive (3rd) gear at 45mph exactly (given my tire size) when I am cruising on a flat road with high engine vacuum. I notice a drop of about 200 rpm in my case.

Since the ECU is already doing a good job at locking up the TC in Drive (3rd) and OD (4th) I don't believe I would gain much by trying to override the ECU and locking the converter at lower speed or a lower gear like 2nd where I would run the risk of making the converter clutch slip under the torque and thus prematurely fail. I going to focus my mod efforts on getting the most cooling I can so that the transmission doesn't go too much above 180 during towing operations.

 

[e21pilot]

On the 1992 4.0 Ranger, does the factory trans output cooling line (hot line) go from the A4LD to the top of the radiator or the bottom of the radiator?