Chevy & GMC Vans

Is there a place that I can fit a sender unit to monitor the running temp on the 700R4?......if so, do we have any diagrams/photos to show where that is?

who makes the most cost effective gauges?

I know this has been done & said before but I couldnt quite find what i was looking for when searching

Thanks!

nobody??

ok, so there is the test port, there is getting a threaded boss welded to the side of the pan, and there is tapping in, in-line after the cooler, what experience do we have of these different places??

where is the preferred position to get the best result?

any better ideas for positioning a temp sender?

OldSmoker, I wish I could help...

I have seen your question and I have no clue. My trans is different.

I hope/wish that one of the oldfarts on here will help you out.

Jim

I also don't know about the 700R4. If the test port is similar to the 4L60E port, you can thread a sensor right in. Your best bet would be to splice a "T" into the hot line to cooler and put the sensor there. This is a more up-to-the-minute view of the fluid temps. The test port gives you more of an average as it sees the fluid that is circulated internal. The test port is easier!

Thank you, chaps!

I have an aux cooler fitted so doing an in-line, before or after the cooler aint so hard!

Part of the reason to do it, is to see if I would be better off just using the aux cooler and bypassing the stock rad cooler completely.

Kewl Beans...

Keep us posted as to what the results are.

Thanks, Jim

will do, Jim, cheers!

There are many opinions as to where to install the gauge's sending unit that vary from the pan to the fluid lines. The easiest and very effective way is to mount the sending unit in the transmission pressure test port.

The pressure test port is an excellent spot for the sender for a temperature gauge. The port has a pipe plug in it now. On most of our transmissions the pressure test port is in the driver's side of the case, just above the shift linkage.



THM700-R4 - 4 Speed transmission used in GM cars and light trucks with the 2.8, 3.1, 4.3, V6, Chevrolet built 305, 350 and 454 engines from 1982 to 1992.

4L60 - Early 1990's saw the 700R4 renamed to the 4L60, and "electronic" models were named 4L60E. 4L60 means 4 forward speeds, L = longitudily mounted (rear wheel drive). 60 is the strength rating (less than the 4L80).

Autometers have a selection of gauges that have a perfectly sized sender with no adapters needed.

http://www.autometer.com/search_results ... ansmission

Wow Great Answer Mr James...

Jim

MrJames, thank you, kind sir!

Today I ordered this kit:

http://www.amazon.com/Derale-13009-Oil- ... 59&sr=1-36

I did some looking around and decided upon this since its a decent price, decent brand, has a good temp range, comes with the sender, a tranny pan plug-in option AND it comes with a nice little mounting bracket that is perfect for my old '89 lower dash.

Initially, im gonna start with the test port, on the next tranny service, I may, may change to reading temp at the pan.

will post pictures of my install too!

That sounds like a good plan.

The installation of the gauge and wiring to the transmission will be part one of the project. It would be nice to see it working right away without the time spent or possible problems cutting into the lines or pan. I believe that the plug is a tapered fit so don't over tighten and use some thread tape.

Now you will be able to gain some experience with how the temperature fluctuates. I recommend that you then obtain the use of a temperature sensor gun. Make measurements of the lines and pan when the highest gauge reading is obtained. Also measure the gauge's sender in the pressure port.

You will now have an idea of any variance of the gauge and sender location before your shop visit.

Good Luck !!

I don't now anything about the 700R4's but I do know the 4l60E's have an internal temp sensor built into another internal component (a valve or something, I forget). Anyway, the PCM monitors the trans temp using that sensor. If the 700R4 has this too then it may be as simple as tapping into the wiring harness. Perhaps someone here with a FSM from that year can look into it. I think it's thermistor that regulates a 5V input like most aftermarket vehicle sensors.

The 4L60E transmission does have a 'GM standard spec' internal temperature sensor. The 4L60E is controlled through a 14 pin wire harness connected to the computer. Two wires in the harness are for relaying the temperature sensor signals.

There is no temp sensor in either the 700R4 or the 4L60. Originally, only the torque converter was computer controlled.

Between 1982 to 1987 the 700R4 transmission was evolving. Post 1987 700R4's had many problems already solved.