What's a "normal" trans temp range?
Thread Starter
On The Tree
Joined: Mar 2012
Posts: 114
Likes: 7
From: Sarasota FL
What's a "normal" trans temp range? Knowing the issues with transmissions in LS4 cars, I drove my 26k mile GXP home for the first time last night. Cruising at 80 for awhile, playing with buttons, I came across the trans temp at 222. OUCH....
Slowed down to 65, and it was down to 195 within 15-20 minutes, and stayed there for the rest of the ride (80 degree night, no traffic). I sped up to 75, and it started climbing over 200 again, so I backed it down to 65.
Parked in the garage this morning, I checked the fluid. Clean, but smells burned (no ****, right??), and its down a little. I'm going to do a complete flush and put fresh fluid in on Monday. I don't remember my 04 GTP temp ever going over 190.
Do LS4 transmissions run hotter? Probably just old fluid, or maybe the trans cooler lines are blocked a little? Otherwise, all this car needs is the HUD replaced, and its a brand new 10 year old car! Any help is appreciated...
Slowed down to 65, and it was down to 195 within 15-20 minutes, and stayed there for the rest of the ride (80 degree night, no traffic). I sped up to 75, and it started climbing over 200 again, so I backed it down to 65.
Parked in the garage this morning, I checked the fluid. Clean, but smells burned (no ****, right??), and its down a little. I'm going to do a complete flush and put fresh fluid in on Monday. I don't remember my 04 GTP temp ever going over 190.
Do LS4 transmissions run hotter? Probably just old fluid, or maybe the trans cooler lines are blocked a little? Otherwise, all this car needs is the HUD replaced, and its a brand new 10 year old car! Any help is appreciated...
TECH Junkie
Joined: Nov 2013
Posts: 3,913
Likes: 366
From: White Bear, Mn
I would say most stock vehicles tranny temps are around 185-205 degrees.
If you were to add a aftermarket tranny cooler and bypass the one in the radiator your temps will drop massively.
I know my car is not a gxp but I put the B&m 70266 tranny cooler in and bypassed the radiator cooler and the highest temps I have seen are 180 on a 90 degree day beating on it on a road course.
I was just out beating on my car today and hit 155 degrees. That's also with a high stall converter.
On the highway in overdrive and the converter locked it will sit around 130-145 degrees depending on outside temp.
This past spring on a 50 degree day it sat at 112 degrees going down the highway at 70 mph
If you were to add a aftermarket tranny cooler and bypass the one in the radiator your temps will drop massively.
I know my car is not a gxp but I put the B&m 70266 tranny cooler in and bypassed the radiator cooler and the highest temps I have seen are 180 on a 90 degree day beating on it on a road course.
I was just out beating on my car today and hit 155 degrees. That's also with a high stall converter.
On the highway in overdrive and the converter locked it will sit around 130-145 degrees depending on outside temp.
This past spring on a 50 degree day it sat at 112 degrees going down the highway at 70 mph
Thread Starter
On The Tree
Joined: Mar 2012
Posts: 114
Likes: 7
From: Sarasota FL
Because the miles are so low, and I've wanted a GXP for years, I'm probably gonna add a tranny cooler to it in the near future, regardless of how it acts after the fluid change.
I traded my beloved 14 Charger RT on my CTS-V, and now the GXP is to save miles on the V. I'm stuck with the GXP for a very long time...the V payment is not cheap
I traded my beloved 14 Charger RT on my CTS-V, and now the GXP is to save miles on the V. I'm stuck with the GXP for a very long time...the V payment is not cheap
Knowing the issues with transmissions in LS4 cars, I drove my 26k mile GXP home for the first time last night. Cruising at 80 for awhile, playing with buttons, I came across the trans temp at 222. OUCH....
Slowed down to 65, and it was down to 195 within 15-20 minutes, and stayed there for the rest of the ride (80 degree night, no traffic). I sped up to 75, and it started climbing over 200 again, so I backed it down to 65.
Parked in the garage this morning, I checked the fluid. Clean, but smells burned (no ****, right??), and its down a little. I'm going to do a complete flush and put fresh fluid in on Monday. I don't remember my 04 GTP temp ever going over 190.
Do LS4 transmissions run hotter? Probably just old fluid, or maybe the trans cooler lines are blocked a little? Otherwise, all this car needs is the HUD replaced, and its a brand new 10 year old car! Any help is appreciated...
Slowed down to 65, and it was down to 195 within 15-20 minutes, and stayed there for the rest of the ride (80 degree night, no traffic). I sped up to 75, and it started climbing over 200 again, so I backed it down to 65.
Parked in the garage this morning, I checked the fluid. Clean, but smells burned (no ****, right??), and its down a little. I'm going to do a complete flush and put fresh fluid in on Monday. I don't remember my 04 GTP temp ever going over 190.
Do LS4 transmissions run hotter? Probably just old fluid, or maybe the trans cooler lines are blocked a little? Otherwise, all this car needs is the HUD replaced, and its a brand new 10 year old car! Any help is appreciated...
The HUD not working could be something as simple as a spring unhooked, or the switch is very inexpensive as well.
https://www.amazon.com/ACDelco-10438...iglink20380-20
https://www.amazon.com/ACDelco-10438...iglink20380-20
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Average temperature for me (engine/tranny fully warmed up) was between 190-205. It popped up to 224 once, so I threw on a transmission cooler last week (standalone). It has not gotten above 165 since (90-95 degree temps outside), with the same drive and sitting even longer in traffic.
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