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  #16 (permalink)  
Old 05-28-2005, 03:26 AM
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Cool, thanks Crossley. That's basically what my logic told me too but I just wanted to make 100% sure.

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  #17 (permalink)  
Old 05-28-2005, 01:23 PM
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Very interesting thread and a lot of good suggestions. It has always been my opinion that the trans temp gauge sending unit should be in the line to the cooler. This will give you a direct indication what temperature the fluid is after doing work in the trans. This temp is what you are concerned with as if it gets too high the fluid will breakdown and loose it's lubricating properties. With the temp sampled off the pan you will not get the true picture of what the oil is seeing in the trans. By the time the oil in the pan is too hot the oil in the trans and converter is burnt.

I've never sampled the temp at the line pressure tap so I can't comment on that without looking at the curcuit diagrams.

Not really wanting to argue here, just my two cents.
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  #18 (permalink)  
Old 05-28-2005, 03:52 PM
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the cooler "out" line from the tranny to the cooler is direct from the converter. This will give a false high temp reading. The tranny oil is not real hot long enough to damage anything. If something is wrong , then yes the temp wil continue on up and smoke the oil and the tranny

the cooler return line will give too low of a temp reading.

After the cooled fluid returns to the tranny it enters the lube circuit of the trans. The lube oil also cools the internal parts of the tranny and then falls to the pan.

In the pan is the best place for a temp reading since the oil has pulled some heat from the internal parts



Quote:
Originally Posted by Overdriv
Very interesting thread and a lot of good suggestions. It has always been my opinion that the trans temp gauge sending unit should be in the line to the cooler. This will give you a direct indication what temperature the fluid is after doing work in the trans. This temp is what you are concerned with as if it gets too high the fluid will breakdown and loose it's lubricating properties. With the temp sampled off the pan you will not get the true picture of what the oil is seeing in the trans. By the time the oil in the pan is too hot the oil in the trans and converter is burnt.

I've never sampled the temp at the line pressure tap so I can't comment on that without looking at the curcuit diagrams.

Not really wanting to argue here, just my two cents.
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Old 05-28-2005, 11:49 PM
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Crosley, I hear you and agree to some extent. But, by the time the trans fluid in the pan indicates too hot, the fluid in the line to the cooler has been burnt. It does not take very many trips through a hot transmission to ruin the oil.

I prefer to to see the highest temp in the curcuit. Besides, this is the oil that turns on the trans cooler fans.
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Old 05-29-2005, 11:45 AM
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turning cooling fans on for the tranny cooler is something that must be addressed on how you have the system hooked up to cool.

Same for engine cooling system. Folks have all kinds of ideas for the location of the cooling fan sensor for an engine

After seeing various setups over the decades I'll stick to reading the temp in the tranny pan or main case.



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Originally Posted by Overdriv
Crosley, I hear you and agree to some extent. But, by the time the trans fluid in the pan indicates too hot, the fluid in the line to the cooler has been burnt. It does not take very many trips through a hot transmission to ruin the oil.

I prefer to to see the highest temp in the curcuit. Besides, this is the oil that turns on the trans cooler fans.
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Old 05-29-2005, 12:42 PM
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Quote:
Originally Posted by Crosley
turning cooling fans on for the tranny cooler is something that must be addressed on how you have the system hooked up to cool.

Same for engine cooling system. Folks have all kinds of ideas for the location of the cooling fan sensor for an engine

After seeing various setups over the decades I'll stick to reading the temp in the tranny pan or main case.
Yes, what works good for you and what you feel comfortable is the way to go. In looking at the circuit diagrams for the 700R4 it appears the line pressure tap would give a reading about equivalent to the pan temp reading would be as the line pressure tap is right off the pump it looks like.

I have plans to put the trans cooler in the bed of the S10. It is a B&M cooler with an electric fan. It has a sensor in the inlet side that controls the fan. We cut a hole in the inside bed panel and I'm hoping that will provide enough air. If not I'll have to go to plan "B". BTW, I haven't figured out plan "B" yet.
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  #22 (permalink)  
Old 05-29-2005, 02:35 PM
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I am familar with the operation of a 700. I've built them professionally for over 2 decades . Still build them and other trannys for a living ( such as it is...LOL)



Quote:
Originally Posted by Overdriv
Yes, what works good for you and what you feel comfortable is the way to go. In looking at the circuit diagrams for the 700R4 it appears the line pressure tap would give a reading about equivalent to the pan temp reading would be as the line pressure tap is right off the pump it looks like.

I have plans to put the trans cooler in the bed of the S10. It is a B&M cooler with an electric fan. It has a sensor in the inlet side that controls the fan. We cut a hole in the inside bed panel and I'm hoping that will provide enough air. If not I'll have to go to plan "B". BTW, I haven't figured out plan "B" yet.
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  #23 (permalink)  
Old 05-29-2005, 11:27 PM
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My hat goes off to you then as I've only rebuilt one and I'm not sure it will work correctly. I have rebuilt many 350s and 400s, a few C4s and C6s. But I must say the 700 was the biggest mess I've ever been into.

Not knowing any better, I started with a 1983 model out of a diesel. Then I read what all must be done to update the older ones. I wish now I'd just got one from TCI or B&M. It was a good learning experience though, just hope it works.
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Old 06-01-2005, 02:22 PM
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i ended up putting the sender in the test port..

I put the sender in the pressure test port. After driving for a few miles the temp gets up to 150-160 range..

I took the truck to the drags and the first pass I went a 13.08..
not what I was looking for but the truck left the line like a turd.
My stock camaro would leave harder than my s-10 does now..

THanks for all advice...
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  #25 (permalink)  
Old 06-02-2005, 07:10 AM
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Quote:
Originally Posted by mychevystang
I put the sender in the pressure test port. After driving for a few miles the temp gets up to 150-160 range..

I took the truck to the drags and the first pass I went a 13.08..
not what I was looking for but the truck left the line like a turd.
My stock camaro would leave harder than my s-10 does now..

THanks for all advice...
Did you notice if the trans temp rose much after the run?
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Old 06-02-2005, 10:03 AM
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no, I didn't look at the tranny temp after the run. I will next time I take the truck (s-10) out..
are you jsut curious of the temp or are you thinkings something may be wrong and make it slip...
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  #27 (permalink)  
Old 06-02-2005, 12:50 PM
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Quote:
Originally Posted by mychevystang
no, I didn't look at the tranny temp after the run. I will next time I take the truck (s-10) out..
are you jsut curious of the temp or are you thinkings something may be wrong and make it slip...
Just curious about the temp.
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