[RockDoc]

Thought I would share the cheap-ass idea for an ATF temp gauge that I just installed. I picked up a digital oven thermometer, removed the metal "probe" housing around the thermocouple, cut it down and sealed it up with some heat-shrink and installed it in my truck. I routed the line through the rubber boot for the gear selector, and up over the transmission, and attached the probe to the output hard line for the stock cooler. It is held on and insulated with a piece of split heater hose and a hose clamp. The display unit is sitting under my parking brake lever.

The thermometer has an audible alarm for when the temp exceeds your setting, a range of 0 - 250C (32 - 480F) and I tested it as accurate to 1 degree at freezing and boiling. It runs off of a single AAA battery

I don't know how long it will hold up in this service, but I wanted something that would allow me to compare before and after some transmission mods that are coming, so if it gives up the ghost in a couple of months, I won't mind.

So far after one city drive, temps seem to stay in the 50-60C (120-140F) range once warmed up. For comparison, the stock ATF temp light comes on at 150C, and off at 120C (300F and 250F). At those temps you are already compromising the fluid and likely the transmission.

Some pics: The thermometer, the thermocouple, the modified temp probe.

[Fullsizeyota]

Thats a good idea but you do know they already make temp gauges for an auto tranny, right? keep us posted on how it works

[RockDoc]

Originally Posted by Fullsizeyota

Thats a good idea but you do know they already make temp gauges for an auto tranny, right? keep us posted on how it works

Note the title of the tread After splurging on an extreme valve body, cheap is good.

[Randy88FJ62]

Ingenious. I like the alarm feature. Cheap way to use thermocouple technology. Good mod for people on a real tight budget. Well done RocDoc.

[Spike Strip]

Very clever.... Wonder if this would work for the wife's Thanksgiving Turkey ?

[cruiser88]

Excellent!

[RockDoc]

1 year later, it's still working, and still on the original battery.

[overhanger]

Originally Posted by RockDoc

Note the title of the tread After splurging on an extreme valve body, cheap is good.

It's not splurging when buying the best brains possible for an A440F. Now take up a collection from all the 62 owners and buy Rodney's temp gauge kit so you can compare against your el cheapo thermometer and calibrate the el cheapo for them. You'd make everybody happy!

[RockDoc]

Originally Posted by overhanger

It's not splurging when buying the best brains possible for an A440F. Now take up a collection from all the 62 owners and buy Rodney's temp gauge kit so you can compare against your el cheapo thermometer and calibrate the el cheapo for them. You'd make everybody happy!

Saw the group buy thread, and thought for a couple minutes. If they aren't too expensive, I might go for one. But to be honest, seeing the temps I get with the aux. cooler and the extreme valvebody I'm not too concerned.

[overhanger]

Like our coolant temp and oil pressure gauges, having a relative base is way better than nothing at all and now that you have some experience with your method it is probably a good way to go. See my post regarding talking to Rodney and his "mate rate" though and it may help you go whole hog on his temp gauge kit. http://forum.ih8mud.com/60-series-wa...group-buy.html

Originally Posted by RockDoc

Saw the group buy thread, and thought for a couple minutes. If they aren't too expensive, I might go for one. But to be honest, seeing the temps I get with the aux. cooler and the extreme valvebody I'm not too concerned.