delay when engaging reverse - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer delay when engaging reverse

Print Thread

delay when engaging reverse #1108813 11/07/11 05:50 PM 11/07/11 05:50 PM
Joined: Jan 2003 Posts: 1,381 Youngsville, NC D dem440c OP pro stock
dem440c OP pro stock D Joined: Jan 2003 Posts: 1,381 Youngsville, NC	problem: a slight delay (approx one full second) between when you select reverse and when it engages. No delay is felt when selecting a forward gear. I've encountered this a few times over the years and am a bit puzzled. I've seen it on used transmissions and on ones I've rebuilt. I've turned up the line pressure on the valve body, triple checked the rear band adjustment. I assume it has something to do with the front clutch although you don't necessarily notice it when shifting into 3rd. Any ideas?

Re: delay when engaging reverse [Re: dem440c] #1108814 11/07/11 05:53 PM 11/07/11 05:53 PM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	It's either delay in engagement of the front clutch or the rear band applying or leakage internal to those circuits .

Re: delay when engaging reverse [Re: JohnRR] #1108815 11/07/11 09:22 PM 11/07/11 09:22 PM
Joined: Jan 2003 Posts: 1,381 Youngsville, NC D dem440c OP pro stock
dem440c OP pro stock D Joined: Jan 2003 Posts: 1,381 Youngsville, NC	right, I agree especially with the front clutch being suspect but I'm wondering if someone has a gee whiz answer as to why. I know I've seen it on several TF transmissions, sometimes even after I did a full rebuild and I'm thinking there must be a common reason why but I haven't figured out yet what it is. Something I'm missing during the rebuild? Or just a weird happening that is only affecting me?

Re: delay when engaging reverse [Re: dem440c] #1108816 11/07/11 11:44 PM 11/07/11 11:44 PM
Joined: Aug 2006 Posts: 107 Sierra Vista, Arizona E extranjero member
extranjero member E Joined: Aug 2006 Posts: 107 Sierra Vista, Arizona	SAme thing happens on my RR. The more it sets the longer the delay. Same thing with my fathers RR also.

Re: delay when engaging reverse [Re: extranjero] #1108817 11/07/11 11:50 PM 11/07/11 11:50 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	Very common - it is called converter drain back. Cure - start in neutral and let idle for a few seconds to fill the converter before putting in gear. fluid isn't pumped in park.

Re: delay when engaging reverse [Re: extranjero] #1108818 11/07/11 11:50 PM 11/07/11 11:50 PM
Joined: Jan 2006 Posts: 587 IL . usa C cjs69mope mopar
cjs69mope mopar C Joined: Jan 2006 Posts: 587 IL . usa	I Have seen this when a shift kit has been installed in the valve body there is a small port that allows the torqe converter to drain back and has to pump up when starting the car in Park . I have seen this hapen to my 68 charger after it sitts for some time But if i start it in netral it seems to help. Some of the trans guys my chime in to explain this more . I belive that this may also be mentioned in the 727 handbook. 1969 Dodge Charger 1969 Dodge Superbee

Re: delay when engaging reverse [Re: cjs69mope] #1108819 11/07/11 11:51 PM 11/07/11 11:51 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	Quote: I Have seen this when a shift kit has been installed in the valve body there is a small port that allows the torqe converter to drain back and has to pump up when starting the car in Park . I have seen this hapen to my 68 charger after it sitts for some time But if i start it in netral it seems to help. Some of the trans guys my chime in to explain this more . I belive that this may also be mentioned in the 727 handbook. read my above post.

Re: delay when engaging reverse [Re: MoparforLife] #1108820 11/07/11 11:52 PM 11/07/11 11:52 PM
Joined: Jan 2006 Posts: 587 IL . usa C cjs69mope mopar
cjs69mope mopar C Joined: Jan 2006 Posts: 587 IL . usa	You beet me to it . 1969 Dodge Charger 1969 Dodge Superbee

Re: delay when engaging reverse [Re: dem440c] #1108821 11/07/11 11:57 PM 11/07/11 11:57 PM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	That problem even occurs in newer models. My 2002 Ram with the 4.7 had the occasional delayed engagement. My 2007 Ram with the 5.7 HEMI acts the same.

Re: delay when engaging reverse [Re: cjs69mope] #1108822 11/08/11 08:56 AM 11/08/11 08:56 AM
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	Quote: You beet me to it . Yeah I know - great minds work together.

Re: delay when engaging reverse [Re: MoparforLife] #1108823 11/10/11 10:03 AM 11/10/11 10:03 AM
Joined: Jan 2003 Posts: 1,381 Youngsville, NC D dem440c OP pro stock
dem440c OP pro stock D Joined: Jan 2003 Posts: 1,381 Youngsville, NC	Quote: Very common - it is called converter drain back. Cure - start in neutral and let idle for a few seconds to fill the converter before putting in gear. fluid isn't pumped in park. no, not what I'm referring to.... I've been in the Mopar game a long time and I'm well aware of the whole situation with the fluid not pumping to the converter in Park plus the story behind why they set the valvebody up in such a silly way.... no, I'm talking about a delay to engage reverse always. Hot, cold, lukewarm, whatever, it has nothing to do with the fluid in the converter. Select a forward gear and bump! it drops in immediately. Select reverse and count "one Mississippi..." and bump! it finally drops in. I ask the question because I've seen it on several different Chrysler transmissions over the years. I've tried a number of things to investigate and address it but haven't figured it out yet. Recently did a full rebuild on a transmission out of a 79 Cordoba that was doing it, I even turned up the line pressure while I was in there but it still did it. Then to experiment I disconnected the kickdown linkage from the carburetor and used a zip tie to hold the lever at the transmission all they way back against its stop and it still had the same delay going into reverse. So it doesn't seem to be a line pressure situation and no, it's not a torque converter fluid level situation. Maybe I'm the only one that has seen this since nobody else is relating....

Re: delay when engaging reverse [Re: dem440c] #1108824 11/10/11 10:26 AM 11/10/11 10:26 AM
Joined: Jan 2011 Posts: 492 Kansas BEINGmeISaCRIME mopar
BEINGmeISaCRIME mopar Joined: Jan 2011 Posts: 492 Kansas	You're not alone. We have a 98 Durango that does it no matter what. Cold morning you can start it and goes right into a forward gear but will delay a second in reverse. You could go drive it 50 miles, shift into reverse and still wait. This particular Durango is on its 3rd or 4th transmission depending on how you want to look at it. The original transmission didn't have any issues with reverse.

Re: delay when engaging reverse [Re: dem440c] #1108825 11/10/11 10:32 AM 11/10/11 10:32 AM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	First off there is a misconception that there is no fluid flow to the convertor in park, not true , it's not as much as in neutral but there is flow in park. I can't remember a grossly long delay going into park other than on a 96 Ram I worked on and that was cured by replacing the inner seal on the drum clutch apply piston, the trans slammed into gear with that. Does this happen after you sit and let the car idle for a minute or 2 , it's takes about a minute for the cooler circuit to fully charge and that is the only way the rear support gets lubed, or are you starting it and immediately throwing it into reverse?

Re: delay when engaging reverse [Re: JohnRR] #1108826 11/10/11 05:24 PM 11/10/11 05:24 PM
Joined: Jan 2003 Posts: 1,381 Youngsville, NC D dem440c OP pro stock
dem440c OP pro stock D Joined: Jan 2003 Posts: 1,381 Youngsville, NC	happens every time, regardless of circumstance. Hot or cold. Like I said, on this most recent example I did a full rebuild on a trans and it still does it. If the trans had some miles on it I would suspect exactly what you mentioned... leaky seals on the front clutch.

Re: delay when engaging reverse [Re: dem440c] #1108827 11/10/11 05:38 PM 11/10/11 05:38 PM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	Do you have a shift kit in the trans ? Do you have any type of delay or overlap on the 2-3 shift? Does it shift hard into reverse?

Re: delay when engaging reverse [Re: JohnRR] #1108828 11/10/11 05:56 PM 11/10/11 05:56 PM
Joined: Jun 2003 Posts: 21,442 It's a dry heat gtx6970 Too Many Posts
gtx6970 Too Many Posts Joined: Jun 2003 Posts: 21,442 It's a dry heat	what kind of seal rings are you using on the ft drum/stator support? the ones that are about 1+1/8" diameter if the ft drum has even the slighest bit of wear on the inside, the rings will not seal well. and you may not be noticing it on accel due to higher rpms

Re: delay when engaging reverse [Re: gtx6970] #1108829 11/11/11 01:22 AM 11/11/11 01:22 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	What vehicle is this in ? We had problems with some trucks around 96 I believe with the check ball in the valve body that lets reverse hit smoother. But they were eating up the rear band as it did delay the engagement a little. On plow trucks it was really bad as they go right into reverse and slam the gas pedal. We actually removed the check ball and then they would go right in but then they hit kinda hard. Ron

Re: delay when engaging reverse [Re: JohnRR] #1108830 11/11/11 01:03 PM 11/11/11 01:03 PM
Joined: Jan 2003 Posts: 1,381 Youngsville, NC D dem440c OP pro stock
dem440c OP pro stock D Joined: Jan 2003 Posts: 1,381 Youngsville, NC	Quote: Do you have a shift kit in the trans ? Do you have any type of delay or overlap on the 2-3 shift? Does it shift hard into reverse? this particular trans was a stock rebuild using a TransStar kit, no shift kit although I did turn up the line pressure with the adjuster there on the valve body. All forward gears appear to behave normal. Reverse engages with what I would describe as a slightly below normal amount of force, once it engages it seems to be completely engaged and not slipping but has this noticeable delay. to reiterate- I asked the question after rebuilding a particular transmission which is out of a 79 Cordoba.... but the question has been in my mind for years because I've seen this on several transmissions that have been in my possession. From memory, all the ones I can think of were 900 series transmissions from the 60's through the 80's. Now that I've seen this same behavior from several different transmissions I started to wonder if there is a particular reason (such as a check ball like the one guy was talking about).... you know, something that other people have seen and figured out. I'm a hobbyist not a professional but I do like to do transmission work and I like to have a deeper understanding about the failure mechanisms. Thanks all for your replies.

Re: delay when engaging reverse [Re: dem440c] #1108831 11/11/11 03:45 PM 11/11/11 03:45 PM
Joined: Jan 2003 Posts: 25,848 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,848 Rio Linda, CA	You need to pull the pan and have a look/see. If the rear band isn't way out of adjustment an air check of the rear servo is in order. The INTERNET, the MISinformation superhighway

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1