Need trans help

[morepowertoya]

I have a 727 transmission that had just been over hauled, new seals,clutches, etc. The transmission is a 1985 out of a Dodge diplomat police car. It has a 1973 valve body in it with a transgo no yoyo shift kit in it. The accumelator has been blocked. The problem I am having is when I shift from park to drive, the transmission doesnt kick into gear until the gas is applied. When put in reverse it go right in to gear and takes off right from idle, like it should. Any of the forward gears 1st, 2nd or drive has problems ingaging until you apply gas, trans does not ingage until right around 1200 rpms, while driving trans seems to work fine shifts ok. Would older style valve body be causing this problem being in a later model trans. I would like to hear comments on this issue with any advise. Thank you

 

[oldkimmer]

.............Not a problem at all, vb will interchange up 2 1986......unless 1 or the other is a lock up trans..........Ill bet they never adjusted the new manual valve properly or not at all......or missed a step in the instructions........kim....

 

[morepowertoya]

the valvebody came from my old 904 and it worked great,shifted nice and firm.both trannies are non lock ups. thanks for reply

 

[Bill Dedman]

I know very little about T-Flites, and I had no idea that the valve body from a 904 would work on a 727.

Thanks for the information.

Good luck with your problem; I am sorry I don't have any information to offer that might help.

 

[fishy68]

I wonder if they screwed up the piston seal on the rear clutch assy. and it's not sealing good. Do you know if the rebuilder air pressure checked parts as he assembled it?

Does it drop out of gear at stop signs?

 

[fishy68]

I know very little about T-Flites, and I had no idea that the valve body from a 904 would work on a 727.

Thanks for the information.

Good luck with your problem; I am sorry I don't have any information to offer that might help.

Yep basically the same. Only big difference is the parking pawl rod length.

 

[morepowertoya]

yes it does drop out of gear at stops,starting to think there is something else wrong.im running the stall convertor that came with trans. its a factory 2400 high stall,i have a b&m flexplate and when car is idling flexplate has a slight vibration .trans and convertor came from 1985 diplomat police car with 318. there are no weights on convertor. did not have this vibration from flexplate with other trans.dont have no way to check trans fluid preasure,if pump assembly is going bad could this cause this.dont know what really got tested in trans overhaul,got from a friend who had it sitting around for awhile, than decided he didnt need it. thanks for all the info,bob

 

[fishy68]

Was it wrapped up while it sat? If not some crap may have into it and is causing a valve to stick in the valve body. It's also possible the seals have dried up from setting and the rear clutch seal isn't sealing. The rear clutch is what engages in 1st gear to make it take off. What engine do you have? If it's an externally balanced engine you have the wrong torque converter since you say it has no weights.

 

[morepowertoya]

trans was stored away,torque convertor was not sealed off when gotten.drained convertor out ,filled with fluid before installed.when trans was first installed,when shifted into all forward gears it would push against brakes like suppose to,took car for test drive,seem to shift ok,third gear took a little long.took home to adjust kick-down linkage,drove about 1.5 miles,goosed throttle couple times,everything felt good.when got home checked fluid levels ok,adjusted kick-down linkage.went to take car for ride put in reverse, goes right in gear pulls against brake like suppose to.put in drive car doesnt move give it a little gas and you feel it start to slip and catch and than it takes off.does not matter which forward gear you have it in, does not engage untill motor spins 1000 to 1200 rpms.i have a 360 with b&m flexplate,the over haul was done with in a year ago,the valve body came from my other trans, was tookin apart and cleaned and reassembled.have not drove car since till i get it figured out,im gonna pull the trans back out maybe this weekend and reinspect the flexplate for cracks, the vibration im hearing concerns me.while i got the trans back out, i will take it apart and look at the seals in the clutches. thanks for all your help fishy68, i will let you know what i find out.

 

[mullinax95]

I had a freshly rebuilt (with shift kit) 727 in a 68 Charger. It had a 2800 Mopar stall converter. When I first crank it up (cold) and start to go it would rev up like that but before the car ever moved after it got warmed up it was normal. It would do it in reverse also from cold start. Ran it like that for years. If you have never ran a stall converter they do rev up a bit higher than a regular low stall converter from take off so take that into consideration.

 

[fishy68]

I had a freshly rebuilt (with shift kit) 727 in a 68 Charger. It had a 2800 Mopar stall converter. When I first crank it up (cold) and start to go it would rev up like that but before the car ever moved after it got warmed up it was normal. It would do it in reverse also from cold start. Ran it like that for years. If you have never ran a stall converter they do rev up a bit higher than a regular low stall converter from take off so take that into consideration.

The slipping in the mornings is a common torqueflite ailment and if you put the shifter in neutral for 30 seconds before you put it in gear it usually don't slip. The torque converter drains back overnight is what causes it. He describes his problem as being all the time in drive only so I don't think that's it especially since he says it goes right into reverse.

 

[fishy68]

trans was stored away,torque convertor was not sealed off when gotten.drained convertor out ,filled with fluid before installed.when trans was first installed,when shifted into all forward gears it would push against brakes like suppose to,took car for test drive,seem to shift ok,third gear took a little long.took home to adjust kick-down linkage,drove about 1.5 miles,goosed throttle couple times,everything felt good.when got home checked fluid levels ok,adjusted kick-down linkage.went to take car for ride put in reverse, goes right in gear pulls against brake like suppose to.put in drive car doesnt move give it a little gas and you feel it start to slip and catch and than it takes off.does not matter which forward gear you have it in, does not engage untill motor spins 1000 to 1200 rpms.i have a 360 with b&m flexplate,the over haul was done with in a year ago,the valve body came from my other trans, was tookin apart and cleaned and reassembled.have not drove car since till i get it figured out,im gonna pull the trans back out maybe this weekend and reinspect the flexplate for cracks, the vibration im hearing concerns me.while i got the trans back out, i will take it apart and look at the seals in the clutches. thanks for all your help fishy68, i will let you know what i find out.

Sounds like your on the right path. BTW: You can do air pressure checks easily without even taking the trans. out. You have to take the valve body out though. Use low pressure like 30-40 lbs. I've attached a couple pictures from the factory service manual that shows what ports go to where so you know where to inject air to test each clutch pack and band. Also a picture of the external oil pressure test ports if you can get a gauge to test them. You should be fine with the B&M flexplate and neutral balanced converter so you do need to find that vibration and taking it apart is probably best to make sure the re-builder set all clearances properly and there isn't any damaged gears/drums/etc..

 

[fishy68]

Sorry that air pressure test port picture is so small. If you want a bigger version pm me your e-mail address and I'll send a nice big pic to you.

 

[morepowertoya]

sent pm to fishy68, thanks for all your help.

 

[morepowertoya]

got your e-mail and pictures,thanks again. i will let you know how things turn out.thanks,Bob

 

[fishy68]

got your e-mail and pictures,thanks again. i will let you know how things turn out.thanks,Bob

Good deal Bob. Let us know what you find.

 

[morepowertoya]

well did the air preassure tests, found rear clutch pack leaking.took pump and clutch drums out of trans,the bigger outer seal around the piston is shredded.the smaller seal is o.k. what would cause this,this seal was brand new.all the seals and gaskets are new.talked to guy where got trans from,he told me that was the same seal blown when he had it, thats why he put a new over haul kit in it.the drum and the piston are in good shape, dont see any reason why seal would blow out.is there anything im over looking that could keep causing this problem.hoping he just didnt get seal installed properly,any comments on this situation. thanks bob

 

[fishy68]

It's possible somebody put the wrong seal in it. early transmissions used a wide lip seal. Later transmissions (started in 70 or 71 IIRC) used a narrower lip seal. If you put the wide lip seal in the newer piston (and it will fit on it) something might catch on it and tear it up.

Am I right Oldkimmer? I know you know TF's real good too. My memory isn't the best anymore due to migraine med I have to take but I think it's the rear clutch pack that had the 2 different width seals. If it's the front clutch please correct me so I don't tell him wrong.

 

[morepowertoya]

thanks fishy68 i believe your right, the seal that was in it was a wide seal.went picked up a new seal at local trans shop, i told them what year the trans was,the seal they gave me was a thin seal.took it home,installed it,assembled clutch drums and front pump assembly together.did air preasure test,works perfect.im going to finish getting all my parts cleaned back up,and assemble everything in the trans and then retest.also found vibration problem, thought it might have been flexplate,turns out torque convertor has hair line cracks in snout where it rides in pump .probably be best to have pump rebuilt and bushing replaced, looks kinda worn.will have to replace convertor also,suprised it didnt leak.i will keep you posted.thanks bob

 

[fishy68]

Good deal Bob. Glad you found the problems. Good luck with it. Tracy