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Topic: Transmission Heating Up (Read 341 times) previous topic - next topic

Transmission Heating Up

Headed from Colorado to HWH going across I-80, ambient temperature 85 degrees, running at 1700 RPM, coolant temp 185 which is about normal.

Transmission temp is usually just a bit higher than the coolant temp, but all of a sudden it jumped up to 202 and as high as 210 averaging about 208.

2001 8.3 Cummins with the Allison 3000.

At idle it cools back to about 195 after a few minutes.

Any help on figuring this out is appreciated.
Mark & Bev
2001 U295 36' Slide
Cummins ISC 8.3 350HP
Build #5802
Jeep Wrangler Toad

Re: Transmission Heating Up

Reply #1 –
Check the obvious first,fluid level,with the dipstick not the shift pad,check coolant level.
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: Transmission Heating Up

Reply #2 –
Yes, I should have added that. Fluid is good.
Mark & Bev
2001 U295 36' Slide
Cummins ISC 8.3 350HP
Build #5802
Jeep Wrangler Toad

Re: Transmission Heating Up

Reply #3 –
Bad gauge?  I don't trust any of my gauges, they are all off when checked against other sources.  Are you using VMSPC
George Mann
2002 U320 #5934
2017 Rubicon
2013 BMW GS
Waterford MI

Re: Transmission Heating Up

Reply #4 –
Yes, using VMS, gushes seem accurate
Mark & Bev
2001 U295 36' Slide
Cummins ISC 8.3 350HP
Build #5802
Jeep Wrangler Toad

Re: Transmission Heating Up

Reply #5 –
When using VMS, do you also have your retarder temperature enabled? I'd like to know the difference between the two. When I'm using the retarder, I usually try to limit it to 260, but my trans temps don't ever go above 200, even climbing up a pass. This is on a 4000 though, so things may be a bit different on a 3000.

Also
"Straight from Allison Website:

Q4: What is the "normal" 3000M transmission operating temperature?

Answer: Normal operating temperature for Non-Retarder transmissions should be between 60 deg. C and 120 deg. C. For Retarder transmissions maximum temperature can increase to 150 deg. C during Retarder operation."

So, 140-248F is considered normal but generally 100F above ambient.
1999 U320 WTFE #5586
2014 Subaru Forester 6sp
4000 watts of solar
650 aH @ 24v