Trans Sport :: Sound When Engaging Transmission / Forward And Specially Reverse
May 16, 2013
Just recently, my '93 transport 3800 has started making weird sounds when engaging transmission , forward...and specially reverse. This is not a transmission problem. It sounds like there is increased torsional movement of the engine/transmission unit and it made me take a look at the engine while would shift in drive and reverse....it does lean much..impressive ..but in fact I do not remember having tried looking for that before...so I cannot compare.
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This transmission shifted smooth and strong through all gears until today when it stopped all of a sudden to engage either Drive or Reverse. No previous signs of slippage, hesitation, stalling or lack of power whatsoever.
We checked the linkage to the transmission and it works as intended, nothing loose or broken, everything is in place. If there was something slightly different with it from other similar vans we have then it had a slightly delayed engagement in Drive (it took a second to engage it after you moved the lever) - on all other vans we have the transmission go into Drive almost instantly.
Van is a '92 Pontiac Trans Sport/Chevrolet Lumina APV with the 3.1L V6 Chevy TBI engine with the 3T40 automatic transaxle. Where we should start tackling this issue?
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My 1999 7.3l Disel 4x4 transmission quit on me the other day. No forward or reverse. Got towed to my regular repair shop, and they are treating the transmission as a black box and recommending total replacement. The diagnostics they performed were to make sure it was shifting, and that indeed it wasn't going forward or reverse. They drained the fluid and said "it's pitch black" and said it had to be completely replaced.
Fluid level was OK, and it wasn't hot. I was driving along, and merging onto the highway. It downshifted, shuddred, and nadda. Free rev. I coasted to the next exit and into a parking lot. Verified that it was shifting, checked Rev and all forwards. It wouldn't shift into 4W, and 1-2 also wouldn't move.
I'm trying to figure out what might have happened... and if it's worth trying to have the truck towed to a transmission shop and have them diagnose and rebuild, vs just getting a remanufactured transmission. None of the local wreckers have any used transmissions, and the cost between a reman and a used is pretty negligible...
Not sure what the symptoms points to for exact failure mode, be it the torque converter, pump, input shaft, etc... I've never had an automatic transmission apart before, but built plenty of motors and am a machinist by trade. My preference is to try and root cause the failure...
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If I press the gas a little hard in drive, my tires squeal but if I'm in reverse I can feel a slipping in the trans. If I try to back a trailer up an inclined driveway, it won't go, the trans slips. I have no crud in the pan. I've replaced the reverse boost valve. I installed a Trans-Go kit which is suppose to eliminate the reverse slip but it hasn't worked. Everything else works just fine and my fluid is red. I have engine braking in 2nd and 1st. The van backs up fine, it just does this in reverse under load.
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I was driving out of a parking lot and as I accelerated onto the main road my vehicle stopped. I heard a grinding sound and could not go forward or reverse. While the car is in drive, park or reverse my car will roll any which way. It pushed it across the street. I tried to locate my tranny dipstick via visual inspection and manual. I could not find it. Could the stick have never been put back at some point in service and caused this issue. That seems unlikely but the thought occurred. Could it be the velocity joint? Whatever it is it certainly sounds like a transmission issue.
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My 95 TS 3.8L is misfiring on #4cyl ONLY when reverse is applied. When car is in reverse with parking brake applied, consistently misfires on #4. In drive with brake applied and engine load no miss. Neutral no miss.
Car drive ability is great in drive no misfires. 100% misfires on #4 only when in reverse. Is there any vacuum change or assist utilized with this trans? Possibly vacuum leak? I do not have a vacuum gauge. I changed to a different plug wire and same problem. New plugs installed. Have not swapped coils yet.
I am not familiar with this trans, other than the vacuum servo for upshifting I replaced when it was sucking up trans fluid like my old Powerglide in the OLD days.
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2003 jetta wagon 1.8t 106000miles with the tiptronic auto trans, has no forward or reverse, no codes, have already drained fluid and refilled, i can see the rpm gauge move when i shift from park to R to D etc, but it will not go at all, i'm thinking maybe the toque converter has failed.
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I've got a 2003 Accent and my automatic transmission went out, no reverse and the only forward gear is 1st. Was thinking of pulling it and swapping it for a used, but I have been reading on here the many, many automatic transmission problems of the accent and my next thought was to just rebuild it myself. But now I'm thinking more along the of a swap from auto to manual, as I don't want to have to rebuild a transmission that is only going to have to be rebuilt again anyway. As far as stuff like the clutch pedal, linkages, gear shifter, I can get those pretty easily. Does the Accent have a hydraulic clutch?
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From time to time, the first time the car is started in a day, the transmission (4T60E, 1993) may take several ............ seconds before first engagement, either in forward or reverse. Fluid level OK, color OK, filter changed 2/3 years ago. This began just a few months ago. After that, everything will work flawlessly for all the day , no problem at all, all shifts OK, all subsequent starts OK.
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Tranny fluid spews out pretty good underneath. Is it likely a broken hose? Where do I start?
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I have a 2008 F-150. When moving gear selector from park to either reverse or drive, trans has a delay engaging. After engagement, it runs fine, shifts ok, downshifts ok....
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I have a 1997 Mercury Mountaineer with a 4R70W trans behind a 5.0 liter. Vehicle sat for about 5 months. Went out to put it back on the road, and now the trans seems to be stuck in a forward gear no matter what the selector is in, park, reverse, neutral. Dropped the pan and replaced the filter and replaced what fluid was drained. no difference,.
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In today's show, a caller with a Ferrari noted that sometimes the transmission would crunch when engaging reverse. I've never had the pleasure of driving a Ferrari, but two Porsches I owned (in my single days) had similar issues. There is no synchro for reverse gear.(Ferarri may be the same) So if I idled in neutral to get the gears moving and then shifted to reverse quickly, the gears would crunch as they meshed. A little drag from the clutch not disengaging completely or the pilot bearing dragging would make it worse. Two solutions are
1)let the transmission coast down by holding the clutch in for a few seconds before engaging reverse, or
2) shift to second, then straight to reverse.
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2006 f150 4x4 4R75E trans slipping in forward gears, reverse is ok. I dropped pan and it was clean. I dropped valve body and found OD servo shaft clip broken, the large snapring was I fine and in place. It allowed the inner shaft to float up and down. Would this cause my forward gears to slip or do I have a bigger problem?
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I have a 98 expedition with a 4.2 liter 4x4 and what I believe to be a 4r70w transmission (u code on the door sticker)
The original transmission went at 105k miles and was replaced with a new factory ford transmission by a ford dealer 3.5 years ago. The new transmission only has 10k miles on it.
Now the new transmission only has reverse. reverse works like normal but no forward gears. the idle will change when i put if in gear, but will not move, acts like it is in N . There is no strange noises.
It's hard to believe a new trany is shot already, no towing, or off road use.
My question is : is there ANYTHING that can go bad that would cause this? The trany fluid is clean and clear bright red, and no burnt smell.
I want to check everything I can before calling a tow truck to have it looked at. I will have it repaired if needed, but I don't think I want to replace another tranny.
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A friend just bought a 99 Navigator, with what wikipedia says is the 4R100. Previous owner allegedly rebuilt the trans but used the old converter
It was apparently slipping a bit, or something, when he got it. Then on the way to my place so I can drive it and see what I think, it started making nasty grinding noises once he hit 4th gear. He got off the highway and made it to my place just fine.
Put it reverse to turn around in my driveway and it started the grinding noises again. Forward gears initially had some grinding as well after that, with no forward motion. Now there's no grinding, and the engine free revs in any forward/reverse gear
Fluid is full, still red, but smells nasty.
I don't suppose the three feed bolts above the valve body being loose would cause this? I imagine he's looking at a rebuild, which neither of us really want to do.
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Early 2000 F250
Originally the truck would not go into any forward gear, but had reverse all day long. So I had a rebuild kit ordered (new bushings, seals, frictions, steels, a washer and flat bearing kit, a sprak kit, and the od piston)
After rebuilding it, taking my sweet time double checking everything, it will now go into forward gear but not reverse. So I dropped the pan. The small 3 bolt plate was torqued to spec. When I got to the third bolt in the smaller section of the valve body (upper valve body) I heard a click like maybe a valve returned to its place but I'm not sure. I removed the valve body and accumulator and all the valves were free and had tension. When I had it apart the first time one valve stuck for a split second but I never could get it to stick again.
Finding nothing there I uninstalled the tranny and took the barrel apart all the way down to the L/R piston and could not find anything wrong.
After the build and me running the truck for about 10-20 min there was metal on the magnet (part of the reason I took it all back apart) however I could not find anything worn or chewed up. Could have been the tc I prefilled with 2 quarts in stead of filling all the way.
When I initially rebuilt the 4r100 I took apart the pump to replace the bushing and seal but did not take apart the valves. I've heard the pump is directly related to reverse but I'm not sure. Could something gone wrong in the pump when I took it apart? How would I know? If I new all parts of the reverse system I could then test them.
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I have a strange knocking sound coming from one of the front wheel wells It sounds like a CV joint going out, but only knocks when the suspension goes up and down. I noticed it after about a week after I installed some H&R sport springs. Its not very loud and is not continuous knocking like a CV joint would be... It does it both in forward and reverse. The H&R sport springs make the car look better and it drives great otherwise.
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My '87 Chevy S-10 transmission slips like mad in forward gears and I can't go everywhere in reverse. The truck is gaaged in southern Virginia about 60 miles from my home and is used on some country property. The local transmission shop wants $1600 to rebuild the trans. He says he used sturdier parts than the replacement GM parts. I'd like to fix the truck because it comes in handy and was my dad's old mode of transportation around the Va. countryside, so it has sentimental value.
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The truck is a 2002 f150 4x4 5.4l... I was driving down the free way last night in 2wd doing about 90kpm when there was a loud bang like a ran over something. Speedo went to zero and abs light came on. Pulled over and shut it down. Crawled underneath to check so damage and couldn't see anything. Stared it back up put it in drive and it just revs. No forward gears or reverse. Fluid level is good, bright pink. Dropped the transmission pan, pan is clean and magnet has next to nothing on it.
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I don't know why... It seems its the 4R100 tranny non pto of course and 2wd version. I drove down the rd. after bleeding the brakes, new caliper front right, came home let it idle for about 10 min, shut her down. Went to move it about an hour later, it went into reverse no problemo, then when put it in Drive it revved like it was in neutral.
There was no banging, no clunkin, nothing to make it seem like something catastrophic happened. I then did a line pressure test and Reverse was fine 200 psi for sure, in drive mode however it was low like around 50 but had to rev real high to get it to 150 like 3/4 pedal and it would want to seem to go forward at a crawl but nothing more.
Next I did the obvious and checked the fluid, it was about 1/4 quart low so added a bit. The fluid did not stink and was beautiful red like new. I then tried again... no dice same scenario. Then took off the pan, no metal chunks and virtually no dust on the magnet??? ok so I figure maybe something with the shift valves? Took them all off and the accumulators as well, all check in place and all valves moved freely.
Now onto the the solenoid pack, checked all per manual for ohms and all were perfect reads at about 27 Ohms, except the EPC solenoid that is the big one on the pack, it should read about 3-5 ohms but this guy is about 12.5 ohms.
I spoke to a tranny shop in town and they said it would not be the EPC and that I could "unplug" the solenoid pack and It would still move forward without it but not to drive like this as line pressure would skyrocket?
I am on a tight budget and working on my back. I am willing to take the tranny out and bring it into town. Personally I think it's electronic but I don't know ...
Why THis thing would have 200 lbs pressure for reverse and so little for forward I mean? that should mean that the pump is working great, if there was a broken something metal I figured I would hear something rubbing or banging or see some shavings?
Can this be a "worn out" valve? or gasket issue? I really want to avoid removing the tranny at all costs so if there is something I am missing let me know and if you think just yank it out I will.
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