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Lockup vs. non-lockup Torqueflites #661337 04/05/10 01:31 AM 04/05/10 01:31 AM
Joined: Apr 2010 Posts: 19 Spokane Valley, Washington S stryker63 OP member
stryker63 OP member S Joined: Apr 2010 Posts: 19 Spokane Valley, Washington	Hello again, I will be running an 8 1/4" rear end in my '73 Duster (mildly built 5.2L Magnum). I want to use an A904 or A999/A998 TF, but my question is...Lockup or non-Lockup? The car will not be raced and won't see a dragstrip, but rather be more of an avenue cruiser and weekend driver. Thanks again for any help.

Re: Lockup vs. non-lockup Torqueflites [Re: stryker63] #661338 04/05/10 07:57 AM 04/05/10 07:57 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	non lock up for hot rodding lock up for MPGs I use a stock high stall lock up A999 in my 85 truck it works and gives it some pep with the high stall TC it should be fine for what you want to do,IMHO

Re: Lockup vs. non-lockup Torqueflites [Re: scratchnfotraction] #661339 04/05/10 11:12 AM 04/05/10 11:12 AM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	I thought the problem with the lockup 3sp's is the lockup engages at a certain speed, regardless of throttle pressure, meaning at WOT the lockup clutch has to sustain the full hp of the engine. Either way, if you buy a lockup trans, there's a kit out there you can install to disable the lockup.

Re: Lockup vs. non-lockup Torqueflites [Re: DaytonaTurbo] #661340 04/05/10 02:59 PM 04/05/10 02:59 PM
Joined: Jun 2008 Posts: 1,822 Colorado D denfireguy top fuel
denfireguy top fuel D Joined: Jun 2008 Posts: 1,822 Colorado	Quote: I thought the problem with the lockup 3sp's is the lockup engages at a certain speed, regardless of throttle pressure, meaning at WOT the lockup clutch has to sustain the full hp of the engine. Either way, if you buy a lockup trans, there's a kit out there you can install to disable the lockup. It will only lockup in third so if you have it floored, it will only go into lockup after it settles into third. Without WOT, it locks at about 30 again, after it shifts to 3rd. There is also a kit that delays the lockup to 40 mph to eliminate shudder with the lockup. Craig 2014 Ram 1500 Laramie, 73 Cuda Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango Only previous Non-Mopar: Schwinn Tornado

Re: Lockup vs. non-lockup Torqueflites [Re: denfireguy] #661341 04/05/10 03:08 PM 04/05/10 03:08 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	at WOT going into 3rd the pressure is high enuff it hits 3rd already locked up not good on the TC clutch from what I have read anyways

Re: Lockup vs. non-lockup Torqueflites [Re: stryker63] #661342 04/05/10 06:15 PM 04/05/10 06:15 PM
Joined: Jan 2003 Posts: 25,791 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,791 Rio Linda, CA	The late 80's-on 904's have an electric input that will unlock the converter on command or prevent lockup if energized. The INTERNET, the MISinformation superhighway

Re: Lockup vs. non-lockup Torqueflites [Re: stryker63] #661343 04/06/10 07:42 PM 04/06/10 07:42 PM
Joined: Jan 2003 Posts: 5,894 Florida Locomotion master
Locomotion master Joined: Jan 2003 Posts: 5,894 Florida	One good thing about later lock-up 904's is that many had a 2.71 low gear set. I'm just not sure exactly what to look for or the years.

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