Trans Cooler

**speedkills** · 09-16-2006, 08:03 AM

Does anyone know?

The trans fluid lines going into the radiator - which line is fluid out of the transmission, the upper or lower line?

**sunsetorangess** · 09-16-2006, 03:42 PM

I would say the lower line.
J

**Red Chevy** · 01-13-2007, 12:29 AM

I would say the upper line, but the best way to find out is ask a mechanic, the other way is disconnect the lines and see which one the fluid pumps out of.

**performabuilt** · 01-13-2007, 10:32 AM

lower line is out on the 4l60e on the trans ,

**12secSS** · 01-18-2007, 07:42 AM

Trans Lines:
Lower = output
Upper = input

Cooler Lines:
Lower = input
Upper = output (this is to keep all debris in the cooler out of the trans, so fluid rises to the top while debris falls to the bottom)

**juiced99ws6** · 01-19-2007, 05:06 PM

Originally Posted by 12secSS

Trans Lines:
Lower = output
Upper = input

Cooler Lines:
Lower = input
Upper = output (this is to keep all debris in the cooler out of the trans, so fluid rises to the top while debris falls to the bottom)

good info

**01Z28M6** · 01-19-2007, 05:13 PM

The line with the rubber hose section is the hot output side from the transmission. As you can see, it enters at the base of the radiator. I know it is the hot line because I made sure of it when I installed my trans temp gauge sensor.

**hamburger68** · 01-19-2007, 11:30 PM

Question:
Do the 98 Z28s come with a stock trans cooler, or would that be a mod?
'Cos then i'd be getting one asap!

**12secSS** · 01-20-2007, 08:28 AM

Originally Posted by hamburger68

Question:
Do the 98 Z28s come with a stock trans cooler, or would that be a mod?
'Cos then i'd be getting one asap!

All automatic transmission equipped vehicles has OEM transmission coolers. If you are using an aftermarket stall (looser then stock), you will need a bigger or supplementary cooler.

**hamburger68** · 01-20-2007, 11:51 AM

So, longer freeway trips at higher speeds (100+ mph) are no problem with the OEM cooler? I know that here in Germany, a lot of Chrysler/Dodge transmissions have heat problems at higher speeds over longer distances and die prematurely.
I have a 2.73 rear end, so the engine turns 2500 rpm at 150km/h (95 mph).

**Orcus79** · 01-20-2007, 12:15 PM

an aux cooler is never a bad investment, cooler temps = longer life.

**hamburger68** · 01-20-2007, 12:21 PM

that was my thought, too.

By the way: Great avatar, just saw the movie (an hour ago).

**juiced99ws6** · 01-20-2007, 08:20 PM

Originally Posted by 01Z28M6

The line with the rubber hose section is the hot output side from the transmission. As you can see, it enters at the base of the radiator. I know it is the hot line because I made sure of it when I installed my trans temp gauge sensor.

how hard and how much was your trans temp gauge

**DANs1998Z** · 02-17-2007, 08:59 PM

so wich tranny cooler would you recommend? isit hard t install?is it better to cap off the radiator coolerlines and get an independent cooling system for the tranny

**1BADDLS1** · 02-17-2007, 09:04 PM

B&M off of Thunder Racing works great 24,000 $70
electric trans temp gauge, autometer $55

both easy installs with following write ups

**01Z28M6** · 02-18-2007, 04:21 AM

Yes, the B&M makes the stacked plate type cooler. These are supposed to be better than the finned tube style, or so I've been told. I could see right away the stacked plates are pretty much immune to smashed fins.