The reply is the PCM is in complete management of each facet of when and how the 4L60E shifts, Line Strain and Lockup. If the command is given barring any mechanical failure clutches, Band And so on the transmission must make the shift or slip and burn itself up making an attempt. Alternately It can’t shift before its commanded.
Lockup once more is strictly a perform of the PCM turning on the lockup solenoid and pulsing the PWM solenoid.
I hear lots of people say my converter locks up sometimes and different not what improper with it. Properly If your converter locks up correctly anytime. Then its more than doubtless a tuning situation and never a TRANSMISSION/CONVERTER difficulty.
On the matter of the vacuum modulator, It can’t exchange the PCM it solely takes over the PCM skill to regulate line stress’s. I have a lot of people ask if I do the “vac mod” will it repair my shift timing challenge? The reply is not any.
2-Shifts become softer or slipping after a converter install.
No actually the shifts remain the identical as before the converter install. They really feel softer due to the converters shift extension/looseness. The transmission it self is doing exactly the same as it did earlier than the converter. Now It can be advantageous to agency the shifts up since more torque is being transferred though the trans at WOT.
3-Growing line pressure in tuning is an effective option to agency up shifts.
Nicely it is going to firm the shifts but at a value of more strain on the arduous parts and greater load on the pump. A typical failure for instance to elevating the line excessively could be the failure of the input drum at the three-four clutch snap ring and even pump failure attributable to the additional stress. There may be even the chance of getting so much line that there are sufficient cross leaks to partially apply clutches or bands after they shouldn’t be on. In my opinion the correct way to enhance shift quality is to install and shift package. I haven’t any desire to sort since all I’ve seen with solely minor variations accomplish the goal not a lot by raising line however by increasing the rate or quantity of fluid being equipped to the clutch in a given time.
Four-Artificial fluid will make your transmission slip.
I’ll doubtless get some flack on this one but this has not been my experience at least not with fluids that meet or exceed the necessities for that exact utility. What this implies is the product no matter type or model should meet the minimum requirements it specifies. As an example if it says meets or exceeds dexron/mercron necessities then it must carry out equal to or better than the specs of that fluid. Now do not suppose I mean that everybody should go buy synthetic because personally I believe its overpriced for what you get. The one real benefit I’ve seen is the power to with stand heat higher than petroleum based merchandise. Nevertheless when you have adequate cooling this should not be and challenge anyway, IMO use the fluid you want or what your converter or trans producer requires. We have no requirement right here.
5- TRANS Fluid can get to chilly and gel at subzero temps.
No it can’t not less than not at any temperature where individuals can dwell. Consider it this manner if it could then in Canada or Alaska the fluid can be gel in the pan within the morning on begin up and would wipe the pump out instantly. I’ve poured fluid from a bottle at -5 degrees and whereas it is simply somewhat thicker it’s certainly not gel. Transmission fluid is made to have a very stable viscosity in any respect temperatures. I am sure like all liquids there is a temp where this might occur however none I have seen.
6-Permitting a transmission to set either in or out of the automobile for prolonged periods (months/years) may end up in failure.
Yes truly it may well. Because the transmission sets for lengthy periods of time fluid will slowly run down and away from the clutches and onerous components. The seals can even dry rot just like the way in which tires do and extra in damp climates moisture can enter and cause rust on laborious elements and even under the lining of the friction supplies and cause them to separate. I have heard the “It labored great once i took it out 2 years in the past story” and its doubtless a real statement solely to listen to later that somebody put it again in and it died in days or weeks or slipped or different sensible acted up from sticky valves. My suggestion for storing a transmission for any size of time is to plug all the holes and fill until the fluid begins coming out of the overflow tube. Then cap this to as that can insure all elements are submerged in fluid. You will just have to drain before restarting after storage. This may help avoid some publish I see with transmission complaints after taking a car out of storage that has been setting all winter.