The Dexron-2 and Dexron-3 ATF are not shear stable as they were never formulated to also be a high pressure gear lube. It is a design defect that has made Sonax a lot of money over the years. Nope, reverse slam is the result of mounting a hardened steel shuttle valve into a soft aluminum bore. This is a strong indication that fluid temps are rising well above normal to the point of causing transmission malfunction.
And in a number of cases it becomes more pronounced over time, even if the car isn't as hot. Quite a few people with reverse slam issues have them occur when the car and tranny are hot, but not under normal conditions. But the same applies to things such as synthetic fluids, more or extra insurance and protection in the circumstances you do need it. I've stated earlier for the average car in average conditions it's probably not really needed.
#Signmaster sc crack#
Quicker to temp, more stable temp, and increased cooling capacity while decreasing thermal load on the radiator and in particular the crack prone end tank area. The trans cooler does work as you described and is all well and good but exactly what is the benefit for the daily driver? Where are the examples of this transmission actually reaching the high temp alarm point? What problem is the addition of a cooler solving? Most of the cooler installations are spliced into an existing transmission cooler line and the radiator loop is left in service.Īs far as I can see it is nothing but a waste of money for no demonstrable gain. On the flip side you have to find a place to mount the new cooler and if you elect for in front of the radiator you are just transfering heat to the A/C condenser and radiator from that mount point. An aftermarket cooler does not add thermal load, and has increased cooling ability unless you go really, really small. While this can help cool the tranny fluid, it does so by adding thermal load to the radiator. In traffic this can approach 220 degree "cooling" fluid. When heat soaked, the stock cooler will attempt to cool trans temps to the coolant temp. With a cooler and thermal valve, temps would rise quicker in this situation, as the cooler is bypasses below the temp on the thermal valve. At low temps the transmission with the stock setup is still pumping fluid through the below freezing temps in the radiator, yet the transmission temp raises more than enough to allow proper shifting and TC operation before the thermostat even opens. IIRC both the shift functions and torque converter require only about 100 degrees F to operate, which is well below the thermostat open point for the radiator. One of them lived in Canada, so I'm quite sure the temps got cool up that way. I'm basing it on the fact that a number or reputable members of this forum have used aftermarket coolers bypassing the factory end tank cooler and have not had issues. IMO there is almost always a better mousetrap.Īre you running one or just basing your speculations on post on here from people who are providing nothing but anecdotal information? that theory would suggest that there is no need for synthetic fluid, more frequent changes, or ever using anything other than OEM parts if reliability is still high.
With a thermal valve your temp will be more stable and the fluid will be happy.Īs for not fixing what's not broken. As I've said, you'll have a really hard time finding transmissions damaged due to lack of heat. Given the choice, I'd go with the cooler myself. If that is the case you can be covered either way, and only buy a line if you need it. A good shop can often bend and flare a new line for the cost of the new ones.
So I guess I'll just buy new lines, and hope that they're of OEM quality and get installed properly.īeing you are having a shop do the work, check with them about lines. My main issue with that is the uncertainty of how it will affect other systems, and as you say, cause new problems. Many posts in threads here make it sound like getting rid of the transmission lines and installing a cooler instead, is the way to go. And the lines will cost about the same as a cooler, so not much difference cost-wise. The reason I was considering it is that, after reading so many threads about how difficult it is to remove those transmission lines from the radiator, I figured I'd have to buy new lines.
0 kommentar(er)
