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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 05-25-2019, 10:53 AM   #1 (permalink)
kerrye
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Replacing trans temp sensor

How difficult is it to replace the transmission temp sensor once the pan is dropped? Is the part of the internal harness it is zip tied to readily accessible?

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Old 05-31-2019, 08:03 PM   #2 (permalink)
bk95td
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It's part of the harness from what I've read. I've replaced the harness while in the truck. I bought the whole kit with all the solenoids and pressure regulator from here: Automotive Transmission Electronics Specialists or another is Discount Automatic Transmission Parts - To The Public

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91 K2500LD reg cab 6.2 4L60 deceased at 310k
92 k2500hd 6.5 4L80E std cab died of frame cancer285 k
4- 93 k2500hd 6.5 2-4L80E 2-NV4500 2-ex-cab 2 std
94 K2500HD 6.5td 4L80E new reman engine
94 K2500HD 6.5td NV4500 Std cab LB
2-94 K1500 Ex cab 6.5TD 4L80E 1-LB parts truck 1-SB
94 k25000 Suburban 6.5td 4l80E
95 tahoe 2 dr 6.5 4L80E needs HG or engine
95 k2500LD 6.5 4L80E std cab bad trans
95 k2500hd 6.5 4L80E ex-cab
2-95 K2500 Suburban 6.5TD 4L80E both need engines
97 k2500hd 6.5 4L80E std cab
97 k3500 C&C 6.5 4L80E std cab needs engine
98 k2500 hd 6.5 4L80E std cab bad trans
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Old 05-31-2019, 08:08 PM   #3 (permalink)
bk95td
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Here is the kits that I buy: 4L80E Master Solenoid Kit 1991 to 2003
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91 K2500LD reg cab 6.2 4L60 deceased at 310k
92 k2500hd 6.5 4L80E std cab died of frame cancer285 k
4- 93 k2500hd 6.5 2-4L80E 2-NV4500 2-ex-cab 2 std
94 K2500HD 6.5td 4L80E new reman engine
94 K2500HD 6.5td NV4500 Std cab LB
2-94 K1500 Ex cab 6.5TD 4L80E 1-LB parts truck 1-SB
94 k25000 Suburban 6.5td 4l80E
95 tahoe 2 dr 6.5 4L80E needs HG or engine
95 k2500LD 6.5 4L80E std cab bad trans
95 k2500hd 6.5 4L80E ex-cab
2-95 K2500 Suburban 6.5TD 4L80E both need engines
97 k2500hd 6.5 4L80E std cab
97 k3500 C&C 6.5 4L80E std cab needs engine
98 k2500 hd 6.5 4L80E std cab bad trans
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Old 05-31-2019, 09:55 PM   #4 (permalink)
johnH123
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yes you have to replace the harness. its easy. Drop the pan, remove the range switch and shift lever linkage from the outside of the trans, then unplug the harness. Use a 1 1/4" socket over the bulkhead connector to push it into the trans.

When you install the new one, lube the o ring with some atf or oil or something. just silde it into place until it locks, then hook up the internal connectors and route it correctly.

You have an early 4l80e so you probably have a temp sensor that is screw into the valve body. The new harness will not be like that- it will have its own sensor that is simply tied to the other wires. Make sure to plug the hole in the VB with something (not sure why, its just what i read in the rebuild manual) I guess you could just snip the wire and leave the old sensor body in place...
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Old 06-01-2019, 09:48 AM   #5 (permalink)
kerrye
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So on the early transmissions you have to replace the whole harness and not just the temp sensor itself? Initially I bought just the temp sensor which is zip tied to the harness. Then I bought a whole harness with the temp sensor since I wasn’t sure. The instructions with the harness imply leaving the original sensor in place when installing the harness with the attached sensor. Neither parts store I visited showed a temp sensor for a 93. The problem is intermittent and I’m on the road until August so I’m trying to avoid the job until I get home unless absolutely necessary
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93 GMC 2500 pickup
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4WD Xtra cab.
New Optimizer 10/14
Rebuilt Central Plains Diesel IP 10/14
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Old 06-01-2019, 03:10 PM   #6 (permalink)
johnH123
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I would just replace the whole harness.
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1993 K3500- 4x4, single cab/long bed, single rear wheels, 4.10 rear end, F vin, Nv4500 manual, factory red interior.


Gone but not forgotten: 2001 silverado 2500hd CC/SB, 4x4, 6.0 vortec, 229k miles when I traded it.
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