View Poll Results: Where best to put sending unit...
Pressure line from tranny
4
44.44%
Return line from cooler
1
11.11%
The transmission pan
4
44.44%
Voters: 9. You may not vote on this poll
Transmission Temp Gauge Consensus?
Thread Starter
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Senior User
Joined: Jun 2003
Posts: 159
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From: CA
Transmission Temp Gauge Consensus?
Has there ever been a consensus over where to put the sending unit for a transmission temperature gauge? I've seen people talk about three possibilities:
1) line coming from transmission - best to see how hot it's really getting
2) line coming from the cooler - best to see how effective the cooler is
3) in the pan - not sure why this would be best...happy median?
I'm planning on installing one along with a few other transmission mods and want to see if this has ever been decided.
1) line coming from transmission - best to see how hot it's really getting
2) line coming from the cooler - best to see how effective the cooler is
3) in the pan - not sure why this would be best...happy median?
I'm planning on installing one along with a few other transmission mods and want to see if this has ever been decided.
Senior User
Joined: Nov 2001
Posts: 161
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I placed the sending unit in my dad's dodge ram in the line coming from transmission. Just make sure you ground the sending unit or it will not work, as we found out. I plan to put one on my 1990 F-150 300 E4OD. We went with a Autometer gauge mounted below the dash.
I would recommend an additional cooler for the tranny fuild, at least a $50 one to be on the safe side with size and weight rating. I already mounted a cooler on my Ford as well as the dodge. I am going to put a Hughes Aluminum pan off Ebay on, it adds 4qt to capacity.
Hope this helps
I would recommend an additional cooler for the tranny fuild, at least a $50 one to be on the safe side with size and weight rating. I already mounted a cooler on my Ford as well as the dodge. I am going to put a Hughes Aluminum pan off Ebay on, it adds 4qt to capacity.
Hope this helps
Senior User
Joined: Sep 2003
Posts: 178
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From: Winnipeg
I second that, as that is the temp. that you are concerned about. A thermocouple sender, which is only about $20, works just fine, 2 wires to the gauge in the dash - no grounding-no power. (Except for the lamp). I used them on my vehicles for years. The trick seemed to be that if the temp climbed over 200f, to back off on the power.
Senior User
Joined: May 2003
Posts: 205
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From: Garden Grove, CA.
I installed mine in the 'test port" on the side of the trans(4r100).
The line coming out of trans to cooler, won't the temps be high? Isn't the torque converter the last place the fluid goes?
I agree an addtional cooler is a good idea.
The line coming out of trans to cooler, won't the temps be high? Isn't the torque converter the last place the fluid goes?
I agree an addtional cooler is a good idea.
Thread Starter
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Senior User
Joined: Jun 2003
Posts: 159
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From: CA
I just put a poll on this one hoping to get some conversation on all the applications. The test port in V104Me's 4r100 is great, but for those without it we are left with the three choices. What are the pros and cons of each application?
Posting Guru
Joined: Feb 2004
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From: Saratoga, NY
Originally Posted by V-104Me
Isn't the torque converter the last place the fluid goes?
NO! It goes from the pan to the pump to the TC (and hydraulic regulator) out to the cooler back in as lube oil. The TC is where most of the heat comes from doesn't make alot of sense for already hot oil to go to the most heat producing part.
Senior User
Joined: May 2003
Posts: 205
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From: Garden Grove, CA.
Phinxter, Where in the cycle of the fluid are the clutch packs lubed? Are they pre TQ?
The clutch packs are the real worry about heat. I'm not discounting the TQ either. I know heat is it's enemy, just not to the extent of the clutch packs.
body9599, yes the test port is very convenient. With an older trans, I would take the temp at the pan. I'm sure plenty of folks can give you safe ranges from the pan.
The clutch packs are the real worry about heat. I'm not discounting the TQ either. I know heat is it's enemy, just not to the extent of the clutch packs.
body9599, yes the test port is very convenient. With an older trans, I would take the temp at the pan. I'm sure plenty of folks can give you safe ranges from the pan.
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Posting Guru
Joined: Feb 2004
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From: Saratoga, NY
Maybe I was a bit too generic on that explanation, so how about instead of sounding like there is one single circuit like it sounded, there is a single lube circuit that goes through the cooler before lubing actual parts. There are other circuits operating at the same time, applying pressure and such. Once the fluid leaves the TC on it's return line it goes through the cooler then back to the case where that line is connected to the lube circuit for the whole trans. Lock-up TC's generate more heat due to it's friction surface if it is constantly in and out of OD. Generally the softer the shifts the more heat it will produce because of more slippage heating up those clutch packs.
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