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Fresh 904 Sluggish "slipping" and soft 1-2 shift... #1228999 05/07/12 05:27 PM 05/07/12 05:27 PM
Joined: Jan 2010 Posts: 509 Middle River, MD M Mapandjlp OP mopar
Mapandjlp OP mopar M Joined: Jan 2010 Posts: 509 Middle River, MD	I just put new clutches, steels, and bands in the 904 behind my warmed 360. I also installed a TCI Trans-Scat kit. It shifts through all the gears but seems to have a lot less power than before...seems like the trans is always "slipping". Also, the 1-2 shift is very soft no matter where the throttle is. Finally, it doesn't always downshift to 1st when slowing to a speed where it should downshift. I know it's tough to diagnose these issues without seeing them first hand but do you guys have any suggestions?

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: Mapandjlp] #1229000 05/07/12 05:35 PM 05/07/12 05:35 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	KD linkage hooked up?? That is what governs the throttle pressure for proper shifting. If not hooked up and adjusted correctly the shifts will be soft and spungy. Also short transmission life.

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: MoparforLife] #1229001 05/07/12 05:47 PM 05/07/12 05:47 PM
Joined: Jan 2010 Posts: 509 Middle River, MD M Mapandjlp OP mopar
Mapandjlp OP mopar M Joined: Jan 2010 Posts: 509 Middle River, MD	Quote: KD linkage hooked up?? That is what governs the throttle pressure for proper shifting. If not hooked up and adjusted correctly the shifts will be soft and spungy. Also short transmission life. Sorry, should have mentioned that the throttle pressure linkage is hooked up and adjusted properly - lever is fully engaged at WOT.

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: Mapandjlp] #1229002 05/07/12 11:02 PM 05/07/12 11:02 PM
Joined: Jan 2003 Posts: 3,472 Lubbock, TX E Erics5th UsedtobeSatellite6
Erics5th UsedtobeSatellite6 E Joined: Jan 2003 Posts: 3,472 Lubbock, TX	Kinda sounds like you don't have enough line pressure (adjusted on the side of the valve body). Eric

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: Mapandjlp] #1229003 05/07/12 11:26 PM 05/07/12 11:26 PM
Joined: Jan 2003 Posts: 2,030 s. e. pa. C calrobb2000 top fuel
calrobb2000 top fuel C Joined: Jan 2003 Posts: 2,030 s. e. pa.	hi may be a bad seal ring on the input shaft ?

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: Erics5th] #1229004 05/08/12 07:45 AM 05/08/12 07:45 AM
Joined: Jan 2010 Posts: 509 Middle River, MD M Mapandjlp OP mopar
Mapandjlp OP mopar M Joined: Jan 2010 Posts: 509 Middle River, MD	Quote: Kinda sounds like you don't have enough line pressure (adjusted on the side of the valve body). That's what I was thinking but I adjusted it (counterclockwise several turns actually) to the level that was suggested by the kit. I did add an aftermarket trans cooler in line with the rad cooler. Could the extra length be causing a drop in pressure?

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: Mapandjlp] #1229005 05/08/12 09:04 AM 05/08/12 09:04 AM
Joined: Jan 2003 Posts: 75,324 A gulag near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,324 A gulag near you.	What does a TCI trans scat kit consist of ?

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: JohnRR] #1229006 05/08/12 01:13 PM 05/08/12 01:13 PM
Joined: Jan 2010 Posts: 509 Middle River, MD M Mapandjlp OP mopar
Mapandjlp OP mopar M Joined: Jan 2010 Posts: 509 Middle River, MD	Quote: What does a TCI trans scat kit consist of ? For the 904, it was just a matter of enlarging a couple of holes in the seperator plate, drilling a hole in the valve body (basically joining two passages that weren't joined before), replacing the 1/2 shift governor, installing a smaller plug in the direct drum fluid passage, and cranking up the line pressure. Here's the install manual http://news.compperformance.com/Instructions/220000.pdf

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: Mapandjlp] #1229007 05/08/12 03:41 PM 05/08/12 03:41 PM
Joined: Jan 2003 Posts: 75,324 A gulag near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,324 A gulag near you.	Quote: lever is fully engaged at WOT. That doesn't always mean its adjusted correctly is this 1 piece or 3 piece linkage

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: Mapandjlp] #1229008 05/08/12 04:01 PM 05/08/12 04:01 PM
Joined: Jan 2003 Posts: 26,837 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 26,837 Rio Linda, CA	Did you air check the trans prior to installing the VB? If you're in doubt about the line pressure, hook up a test gauge and check it. If it's good, remove the VB and do an air check. The INTERNET, the MISinformation superhighway

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: JohnRR] #1229009 05/08/12 04:04 PM 05/08/12 04:04 PM
Joined: Jan 2010 Posts: 509 Middle River, MD M Mapandjlp OP mopar
Mapandjlp OP mopar M Joined: Jan 2010 Posts: 509 Middle River, MD	Quote: Quote: lever is fully engaged at WOT. That doesn't always mean its adjusted correctly is this 1 piece or 3 piece linkage It's one piece linkage. It all worked fine before I pulled it for the rebuild (other than the fact that the trans had 140k on it and needed a freshening).

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: John_Kunkel] #1229010 05/08/12 04:05 PM 05/08/12 04:05 PM
Joined: Jan 2010 Posts: 509 Middle River, MD M Mapandjlp OP mopar
Mapandjlp OP mopar M Joined: Jan 2010 Posts: 509 Middle River, MD	Quote: Did you air check the trans prior to installing the VB? If you're in doubt about the line pressure, hook up a test gauge and check it. If it's good, remove the VB and do an air check. Forgive my ignorance but what's an air check and how do I perform one?

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: Mapandjlp] #1229011 05/09/12 02:51 PM 05/09/12 02:51 PM
Joined: Jan 2003 Posts: 26,837 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 26,837 Rio Linda, CA	With a rubber-tipped blow gun you introduce air into the various passages in the case to apply the bands/clutches and listen for big air leaks. 7198799-Air_tes.jpg (152 downloads)

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: John_Kunkel] #1229012 05/10/12 08:19 AM 05/10/12 08:19 AM
Joined: Jan 2010 Posts: 509 Middle River, MD M Mapandjlp OP mopar
Mapandjlp OP mopar M Joined: Jan 2010 Posts: 509 Middle River, MD	Quote: With a rubber-tipped blow gun you introduce air into the various passages in the case to apply the bands/clutches and listen for big air leaks. Thanks, John. The kit I used had me install a plug with a smaller hole in it into the front clutch apply passage in the case. Any idea what the purpose of this was? Last edited by Y4 Challenger; 05/10/12 08:19 AM.

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: Mapandjlp] #1229013 05/10/12 09:33 AM 05/10/12 09:33 AM
Joined: Jan 2003 Posts: 75,324 A gulag near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,324 A gulag near you.	Quote: Quote: With a rubber-tipped blow gun you introduce air into the various passages in the case to apply the bands/clutches and listen for big air leaks. Thanks, John. The kit I used had me install a plug with a smaller hole in it into the front clutch apply passage in the case. Any idea what the purpose of this was? Not the john you questioned , but that plug is to slow the apply of the front clutch due to the increase in line pressure making it happen faster without it . It would not cause the sluggish feel or cause your soft 1-2 shift.

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: JohnRR] #1229014 05/10/12 07:12 PM 05/10/12 07:12 PM
Joined: Jan 2010 Posts: 509 Middle River, MD M Mapandjlp OP mopar
Mapandjlp OP mopar M Joined: Jan 2010 Posts: 509 Middle River, MD	I spoke with Mr. John Cope of Cope Racing Transmissions today. We discussed several different scenarios and based on our conversation, I decided to pull the valve body and have a look at where I had the line pressure adjustment set. According to the TCI Trans-Scat kit I used, the distance between the spring plate and the valve body was to be 1 3/8". I used this as my guide. According to Mr. Cope, the maximum should be six turns from the point where the spring plate is flush with the bracket. Mr. Cope told me that you can actually have too much pressure on the valve causing the opposite effect. I adjusted the plate according to the advice from John Cope. I also re-adjusted the low/reverse band. These two changes seem to have fixed my problem. Thanks to all of you who helped!

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: Mapandjlp] #1229015 05/10/12 07:35 PM 05/10/12 07:35 PM
Joined: Jan 2003 Posts: 75,324 A gulag near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,324 A gulag near you.	Quote: I spoke with Mr. John Cope of Cope Racing Transmissions today. We discussed several different scenarios and based on our conversation, I decided to pull the valve body and have a look at where I had the line pressure adjustment set. According to the TCI Trans-Scat kit I used, the distance between the spring plate and the valve body was to be 1 3/8". I used this as my guide. According to Mr. Cope, the maximum should be six turns from the point where the spring plate is flush with the bracket. Mr. Cope told me that you can actually have too much pressure on the valve causing the opposite effect. I adjusted the plate according to the advice from John Cope. I also re-adjusted the low/reverse band. These two changes seem to have fixed my problem. Thanks to all of you who helped! Did you readjust the FRONT band ? the low reverse band is only used in reverse and when you have the trans shifted into L ... low, it is not applied if the trans is in D ...drive.

Re: Fresh 904 Sluggish "slipping" and soft 1-2 shift... [Re: JohnRR] #1229016 05/11/12 07:51 AM 05/11/12 07:51 AM
Joined: Jan 2010 Posts: 509 Middle River, MD M Mapandjlp OP mopar
Mapandjlp OP mopar M Joined: Jan 2010 Posts: 509 Middle River, MD	Quote: Did you readjust the FRONT band ? the low reverse band is only used in reverse and when you have the trans shifted into L ... low, it is not applied if the trans is in D ...drive. Yep, that's the first thing I did when I knew it wasn't acting quite right.

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