Ill give you a quick run down on your tranny,,, Most likly your sincronizer is getting worn, the sincro looks much like a cone clutch without much surface area and made of brass ,, its job is to do just what its called, sicronizeing the two shafts to the same speed, allowing the slider to move into place locking the two shafts by outer splines together and locking its self in place with spring loaded inner locks to hold it in its gear, When the slider goes bad the transmission will not as my experience has been,will no longer hold itself in gear and it will pop out on you..Also if your sincronizer is worn proubly the outer splines are worn as they have a special shape in order for the slider to move over and instead of pointed they become rounded or even flat and this also will cause your issue,, basicly you need to have it taken down and inspected most likly to solve your issue and you may spend 600 to 1500 depending on what is found. Alot of the old standard racers would remove cetain amount of the outer splines for speed shifting and even made claims they could shift the nicknamed Hemi box without no clutch at all , however my guess is they spent alot of time picking up parts and peices of the track.., Roger Reynolds .
you can get the rear cover off in the car so you should be able to get the brackets on however the ring gear bolts are going to take a big air gun to get loose...Roger Reynolds
Sounds like to me your trany is bleeding to death.. you wont burn the bands, it dont have any however it has 5 seperate clutch packs and my guess is their allready glazed or toasted.. Get a rebuild ...Roger Reynolds
I cant say Ive ever noticed a large difference in hot or cold shifts in a healthy transmission, running it cold wont hurt it, remember heat is your enemy however Im sure warmer thinnner oil moves a bit easier,, I would go ahead and put the new chrysler #4 oil and filter and flush and the #4 oil has a addative that may resoften your trany seals if they have lost their softness and help out...l Roger Reynolds
I wanted to post a second time on your question as I may have missed a very important point to you question... If I understood correctly you designed a cooler that only allows flow of lube oil after 120 or it flows all the time and only starts to cool after 120 and maybe a electric fan kicks in? Ill pass this on.. you cannot cut off the lub oil to your transmission , it needs to be lubed just like a engine all the time,, It wont die as fast as a engine without oil but its a slow death and will not survive . roger
my understanding is all P.Ts have 4 cylinders and I havent at this point seen a avenger with anything other than V 6, IN that so far as I know,, NO deal on swaping a PT manual to a avenger...Not to mention timing sensor may require you to upgrade to a MSD 6al box and make a crank trigger for your ignition to work... Chrysler corp has made a few changes on the 604 s that as I see it , you can rebuild and bullet proof a 604 if you want to spend the bucks,, Of course your rebuild is only as good as the converter rebuilder but they can be up graded also and little things like unhooking your coolant sensor for raceing will keep it from lking up during full throttle...E mail rreynold@nemonet.com
Hey Ill keep you posted on this project Im doing but Ill pass this on for now,, Im doing some experimental parts and we had a guy who added the exzaust , air system and some kinda computor change.. Im still in the process of adding a dry shot NOS that Im plumbing up by shooting to each cylinder individually to equalize the flow,(40 HP) however the preveious mod was adding a set of quick change gears to the 604 trany and this one item easily shamed all his add on stuff by itself so when I add the NOS Im suggesting the 3.0 in my Dodge spirit will most likly out perform some of the high dollar turbo systems. Ill keep you posted ...If you have any questions here is my E mail rreynold@nemonet.coml
Transmission has a different mounting pad in the back and different harrness for the prindle switch... Get your tranny fixed or ck out.. If your trans pan isnt full of metal and clutch materials,, you my try going to Chrysler (NOT AUTO ZONE) and purchase a new input and output sensor..Roger Reynolds -Hannibal transmission and roadrage 604 quick change gears...
call it what you want but at my shop a simple fix at this time no failures, we simply run a wire feed weld bead across the pen on each end, havent had a failure yet and been doing this for years...Of course were in the process of a rebuild so I dont know if this can be done in car safely, possible fire hazzard but unlikley.. Owner of Hannibal Transmission and roadrage 604 quick change gears ..Roger Reynolds
I would put forward that your shift character can change and be different due to temp change alone as thick cold fluid can have a different apply than hot fluid...It may also be different due to you can have converter lk up in 3 and stay lk up mode during 4 th shift and this would be different with a non lok up shift into 4th. A slippage between shifts would not be normal however you should notice a quick jump of the tack needle if this is happening and hear a engine flare , if this happened too often you would get a gear ratio error and go into limp mode being 2 gear... As far as d to od selection on normal driveing I highly suggest in town to drop into d selction because you can get od at 40 mph in some vechicle and then it is constantly shifting back and fourth along with the converter, however you wont notice gas milage difference in town but on the high way you would,, As far as the tranny- running hotter in D I doubt,, the main heat source for a transmission is the torque converter,, thats why most standards dont have coolers,, the bearing s make some heat but since the lk up converter came to the scene transmission run much cooler on the highway.. I feel with the extra rpms d selection creates, it pumps better\ lube oil volume, cooling more oil... and in D you are turning 1 to 1 , in this your not loading the taper bearings near as bad nor the torring bearing makeing this a much stronger gear and more durable..OD is 1 in and 1. whatever out ,,, you will burn more fuel and engine may run a bit hotter but most manafactures recomend pulling selection into D for towing, I would say its more likly the transmission would run a bit cooler in reguards to produceing its own heat but it may get more radiant heat off the engine block and keep it at the same temp.. You should put a trans temp guage on a let us know the results...Roger Reynolds,, Owner of hannibal transmission and roadrage quick change gears...
Sorry your so far away or I would ship you out a tranny,, Ill pass this on... If your pulling a trailer,, drop your slector down to D or 3 in stead of OD selection this will help out.. I have my doubts your cooler is the issue however you need to find a new rebuilder, we build 604 s and abuse the hell out of them ..Roger Reynolds, owner of Hannibal transmission and roadrage quick change gears.. E mail rreynold@nemonet.com
One item that you always want too keep in mind is their are two types of 604 transmissions, those that are bad and those that will go bad, you transmission going into fail safe comes from 3 basic possibilities,, Input or output sensor failure, gear ratio error from clutch slippage, or converter slippage in abbility to lk up...solinoid pk failure,,, Since your faceing a warm up failsafe instead of cold failsafe I would suggest getting the input and out put sensor changed as the are often bad at every 60 thousand and get these at Dodge not Auto zone..Provideing your not haveing a internal clutc h or mechanical failure often Solinoid packs will fail to connect after the unit is up to operateing temp however it usually takes much longer than 20 minutes to fully warm up but depending on why the solinoid pak is loseing it ability to connect,,, solinid s work off a magntic feild when energized for reasons Im not going to explain , heat will render them unable to work , Another possibility is you have a clutch pk failing and the cold oil is able to work and appply that cluch and leaks to much when it warms...I doubt the dextron oil is a big issue,, My shop has built hundreds of 604 s and often used dextron 2 with zero combacks. I say a good rebuild trumps the oil..If you can find a honest transmission shop have you codes cked , let me know what they are and iIll try let you know RREYNOLD@NENONET.COM Owner of Hannibal Transmission and Road Rage quick change gears....
Basicly shift kits worked on a simple primiters,, they uped the lline pressure and you could drill larger holes in seperator allowing more volume to a clutch pk and block acculators in their bores or stiffin the accullator springs...as they assume some of some of the oil volume comeing from the shift valve... The 604 is a different type of automatic in comparrison to general parts used in most automatics.. It was designed with no bands or sprags in order to save length and size in order to make it fit where the preveious 3 speed auto would fit to save staggering costs on changeing assembly line at the auto maker...The onboard computor for one is going to adjust the shift how it wants , not how you want... you change the line pressure, it will simply lower the amount of oil to the shift, putting it back to the same old shift... I think a person could cause proublems for the 604 by upping line pressure due to the issue of no sprags that is a big help for transmission of old as it will hold a drum in one dirrection but allow it to free wheel the other, 604 shifts must be precice to relieve one clutch pk while appling another without engine flares or tie ups between shifts,, I dont feel their is any aftermarket shift kit that compliments the 604 at this time. Roger Reynolds ,,Hannibal transmission and Roadrage quick change gears...
Just make sure you buy a Chrysler Sensor,, I have had several folks by my shop who purchased a aftermarket sensor from Auto Zone and it worked for a couple of weeks and went bad.. Roger Reynolds.. Owner of Hannibal transmission and Roadrage quick chage gears...
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