Skip to main content ↑ ↓
Topic: Transmission Temperature Sender Resistance (Read 408 times) previous topic - next topic

Transmission Temperature Sender Resistance

My coach has the originally outfitted Stewart Warner gauge set. Transmission temp(150-350 gauge range) is reading excessively high, when compared with an IR gun it is reading 80-100dgs high. Normal flat land driving is registering 240dgs (everything shifting perfect, engine coolant temp below 180dg) . You can pull the dipstick and wipe the fluid in your fingers and tell it's maybe 140-ish.. The sender (at 75dgs) reads 2300ohms, I've disconnected it and simulated some differing resistance values to the guage and it seems to track really well from 600ohms (close to 150dg) down to 150ohms (275dgs). Does anyone have the actual sender resistance specs? or the actual sender part number?
Thanks
Len Barron
1988 GV36 U280 3208T(250hp)/MT643
1972 Jeep Commando LS2/4L65e
2000 Chevy Express Hightop Campervan
LBZ Duramax /6sp Allison

Re: Transmission Temperature Sender Resistance

Reply #1 –
Quote from: len.barron –
My coach has the originally outfitted Stewart Warner gauge set. Transmission temp(150-350 gauge range) is reading excessively high, when compared with an IR gun it is reading 80-100dgs high. Normal flat land driving is registering 240dgs (everything shifting perfect, engine coolant temp below 180dg) . You can pull the dipstick and wipe the fluid in your fingers and tell it's maybe 140-ish.. The sender (at 75dgs) reads 2300ohms, I've disconnected it and simulated some differing resistance values to the guage and it seems to track really well from 600ohms (close to 150dg) down to 150ohms (275dgs). Does anyone have the actual sender resistance specs? or the actual sender part number?
Thanks

I don't have spec's for your trans, but went through this with the retarder sensor on ours.

No matter how much I bench tested, it OMH'd fine. I just bought a new one, and it solved the problem.

Chris
Chris and Tammy White  CDA Idaho
Previous owners 1997 U295 36' 3126 Cat 300 HP Build # 4998
Former Foretravel tech & RVIA certified tech
Former owner Custom Satellite home/RV satellites 
Former owner Vans LTD  van conversions
Unemployed, panhandler, drag racer NHRA #6348

Re: Transmission Temperature Sender Resistance

Reply #2 –
I found what I believe to be the closest Stewart Warner sender(280EE-F) available. It is a 140-320dg sender, my SW gauge is 150-350dg. $20 shipped from ebay so it's worth a shot.
Len Barron
1988 GV36 U280 3208T(250hp)/MT643
1972 Jeep Commando LS2/4L65e
2000 Chevy Express Hightop Campervan
LBZ Duramax /6sp Allison

Re: Transmission Temperature Sender Resistance

Reply #3 –
Installed the new SW 280EE-F sender and that fixed it. I tested the resistance of the new unit and compared it to the old, about 73dg yesterday, new sender was 8200ohms, old sender was 2300ohms...with the resistance decreasing as they warm up it's pretty easy to see why  I had 80-100dg higher than actual temp display.
I also found the original part number on the old unit, it is a Datcon 02025-00, it also is listed as a 140-320dg sender.
Len Barron
1988 GV36 U280 3208T(250hp)/MT643
1972 Jeep Commando LS2/4L65e
2000 Chevy Express Hightop Campervan
LBZ Duramax /6sp Allison

Re: Transmission Temperature Sender Resistance

Reply #4 –
Good job, thanks for leaving all the info and part numbers, it will help people in the future.

I wish others would post resolves.

I have read  long posts, with no resolve.

CW
Chris and Tammy White  CDA Idaho
Previous owners 1997 U295 36' 3126 Cat 300 HP Build # 4998
Former Foretravel tech & RVIA certified tech
Former owner Custom Satellite home/RV satellites 
Former owner Vans LTD  van conversions
Unemployed, panhandler, drag racer NHRA #6348