The seals can even dry rot similar to the way tires do and more in damp climates moisture can enter and cause rust on hard parts and even under the lining of the friction materials and cause them to separate. As the transmission sets for long periods of time fluid will slowly run down and away from the clutches and hard parts. I am sure like all liquids there is a temp where this could occur but none I have seen.Ħ-Allowing a transmission to set either in or out of the car for extended periods (months/years) can result in failure. Transmission fluid is made to have a very stable viscosity at all temperatures. I have poured fluid from a bottle at -5 degrees and while it's just a little thicker it's certainly not gel. Think of it this way if it could then in Canada or Alaska the fluid would be gel in the pan in the morning on start up and would wipe the pump out immediately. No it can't at least not at any temperature where people can live. We have no requirement here.ĥ- TRANS Fluid can get to cold and gel at subzero temps. However if you have adequate cooling this should not be and issue anyway, IMO use the fluid you like or what your converter or trans manufacturer requires. The only real advantage I have seen is the ability to with stand heat better than petroleum based products. Now don't think I mean that everyone should go buy synthetic because personally I think its overpriced for what you get. For instance if it says meets or exceeds dexron/mercron requirements then it must perform equal to or better than the specifications of that fluid. What this means is the product regardless of type or brand must meet the minimum requirements it specifies. I will likely get some flack on this one but this has not been my experience at least not with fluids that meet or exceed the requirements for that particular application. I have no preference to type since all I have seen with only minor variations accomplish the goal not so much by raising line but by increasing the rate or volume of fluid being supplied to the clutch in a given time.Ĥ-Synthetic fluid will make your transmission slip.
#4L60E SHIFT KIT INSTALLED NOW SLIPPING INSTALL#
In my opinion the proper way to improve shift quality is to install and shift kit. There is even the possibility of having so much line that there are enough cross leaks to partially apply clutches or bands when they should not be on. A common failure for instance to raising the line excessively can be the failure of the input drum at the 3-4 clutch snap ring or even pump failure due to the extra stress. Well it will firm the shifts but at a price of more strain on the hard parts and greater load on the pump. Now It can be advantageous to firm the shifts up since more torque is being transferred though the trans at WOT.ģ-Increasing line pressure in tuning is a good way to firm up shifts. The transmission it self is doing exactly the same as it did before the converter. They feel softer because of the converters shift extension/looseness. No in fact the shifts remain the same as before the converter install.
I have a lot of people ask if I do the "vac mod" will it fix my shift timing issue? The answer is no.Ģ-Shifts become softer or slipping after a converter install. On the matter of the vacuum modulator, It cannot replace the PCM it only takes over the PCM ability to control line pressure's. Then its more than likely a tuning issue and not a TRANSMISSION/CONVERTER issue.
Well If your converter locks up properly anytime. I hear a lot of people say my converter locks up sometimes and other not what wrong with it. Lockup again is strictly a function of the PCM turning on the lockup solenoid and pulsing the PWM solenoid. Alternately It cannot shift before its commanded. If the command is given barring any mechanical failure clutches, Band ETC the transmission must make the shift or slip and burn itself up trying. The answer is the PCM is in complete control of every aspect of when and how the 4L60E shifts, Line Pressure and Lockup. 1-What controls the shifts in a 4L60E 4L80E and can I replace the PCM with a vacuum modulator.
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