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#4628781 - 01/08/18 10:16 PM I may have finally had that epiphany
99Burb454 Offline


Registered: 05/28/17
Posts: 47
Loc: Missouri
So, I just returned home from the auto parts store and tried again, to no avail, to put my transmission in reverse....nothing... so I did as any normal genius would do, I revved the engine a little bit and.... still nothing.... or was it nothing? Wait a minute, put it in neutral, rev the engine a little again.... there it is again.... a very noticeable, frankly, how did I ever not notice it before... when the rpms are almost back to idle speed there is a HUGE vibration/shudder coming from the area of the torque converter. Could this be my issue? My flywheel perhaps? The TQ itself? Wouldnít be the input shaft, all forward gears are operational, albeit they feel slow to me... sluggish. But when shifted into reverse(which doesnít work) or neutral and the engine revved momentarily to about 2,000 rpm and let off there is an unmistakable HUGE shudder at about 1,000-1,200 rpms. Itís done that for I donít know how long but I can remember it for a ways back. What is it? I canít find anything online to help me diagnose it, is it a symptom of my transmission problems? Somebody here in this forum, please give me the answer that Iíve racked my brain for for over 2 months now. Iíve read and researched and asked question after question and Iím starting to get tired of it all. Help me fix this issue please. Iím begging over here. Lol. I wouldnít think that the shudder is normal. Help!!!!! Please!!! Lol
_________________________
1999 'Burb 2500 LT 7.4L 454-4" suspension lift, 35" Nittos, running boards and dents in the hood from idiots at work. Always ISO of mods. Lmk

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#4628784 - 01/08/18 10:23 PM Re: I may have finally had that epiphany [Re: 99Burb454]
Warstud Offline


Registered: 09/02/05
Posts: 5397
Loc: MIchigan
Your tranny is shot. Reverse is the first to go.

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#4628788 - 01/08/18 10:33 PM Re: I may have finally had that epiphany [Re: Warstud]
daves87rs Offline


Registered: 02/23/09
Posts: 16980
Loc: Michigan
Originally Posted By: Warstud
Your tranny is shot. Reverse is the first to go.


+1
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Coming together is a beginning; keeping together is progress; working together is success.

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#4628792 - 01/08/18 10:41 PM Re: I may have finally had that epiphany [Re: 99Burb454]
Rolla07 Offline


Registered: 11/05/11
Posts: 4737
Loc: MTL, CANADA
Known weak spot on those suburbans. Know someone who had one and went through 3 transmissions before giving up. New trans or new ride...
_________________________
2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967


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#4628794 - 01/08/18 10:42 PM Re: I may have finally had that epiphany [Re: Warstud]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
Originally Posted By: Warstud
Your tranny is shot. Reverse is the first to go.


Been here, done that.
_________________________
07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio

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#4628805 - 01/08/18 11:04 PM Re: I may have finally had that epiphany [Re: 99Burb454]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
I have to agree with the others.

Didn't you JUST do a transmission in the 'burb not long ago?
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(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4628858 - 01/09/18 02:10 AM Re: I may have finally had that epiphany [Re: Warstud]
99Burb454 Offline


Registered: 05/28/17
Posts: 47
Loc: Missouri
Sorry but I respectfully disagree. Tranny isnít shot just because you lose reverse or just because itís acting other than how itís supposed to normally operate. Thatís when you start diagnosing the problem and fix whatís wrong instead of just dumping $2500 at the transmission shop like they all want you to believe you have to do. Transmission shops and mechanics are so fast to just up and tell you that you need to R&R every time some little thing goes wrong with the transmission and everybody believes them because theyíre the expert right? Well, to some extent that would be correct, they are supposed to be the experts, but why then do they always say rebuild, rebuild, rebuild instead of fix, fix, fix? Money, money, money. And I donít just mean money in their pockets, I mean itís meant to supposedly save the customer money in the long run but when you do all of the work yourself itís going to take an awful lot of parts to get to $2500 and me saying, ďdang, shouldíve just rebuilt the thingĒ. Lol. If I can spend $200, $300 or even $500 now rehabbing it and getting it to last another 3 months even then itís worth it to me. I donít want to pay anyone half of what I paid for the vehicle in the first place or 1/3 more than what a refurbished one costs to work on my transmission. If anything Iíll remove it myself and take it to them to be rebuilt. So does anyone have an answer or idea about the feeling Iím getting from under the truck? Thanks, hope everyone has a good evening
_________________________
1999 'Burb 2500 LT 7.4L 454-4" suspension lift, 35" Nittos, running boards and dents in the hood from idiots at work. Always ISO of mods. Lmk

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#4628861 - 01/09/18 02:22 AM Re: I may have finally had that epiphany [Re: Linctex]
99Burb454 Offline


Registered: 05/28/17
Posts: 47
Loc: Missouri
I donít agree with it being shot. It may be as simple as the O-ring on the reverse servo piston causing a leak past situation which is causing the pressure to be too low to engage reverse. It never made any loud bangs or anything like that, reverse started going soft one day and the next it was completely gone... but... BUT!!!... I thought the exact same thing as you guys do now about 2 weeks ago, after changing my 4wd selector seitch and rehabbing the exterior transmission and Tcase wiring, all of a sudden the transmission has new life in it. I changed the throttle position sensor and cleaned my throttle body and mass air flow sensor today and the sluggishness is gone from the forward gears now too. Thereís no more harsh shifts after changing the 4wd selector switch. I think Iím going to pop the pan again over the weekend and have a look at the pan magnet, the reverse servo piston seal and the pressure switch manifold. And change the filter again while Iím in there. I refuse to throw that type of money at it without at least trying to fix it first. And no it didnít just get a new transmission or a rebuild, this is the same one I thought was dead back in November that now suddenly has life left in it
_________________________
1999 'Burb 2500 LT 7.4L 454-4" suspension lift, 35" Nittos, running boards and dents in the hood from idiots at work. Always ISO of mods. Lmk

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#4628866 - 01/09/18 02:40 AM Re: I may have finally had that epiphany [Re: 99Burb454]
FowVay Offline


Registered: 06/02/02
Posts: 2679
Loc: Southeastern USA
Mr. Burb, a rebuild is a repair. When the scope of removal, disassembly, cleaning, inspecting, reassembling, testing, installing, filling, and operations checking the component is the same whether you change a gear set or a gasket, people tend to overhaul the entire module while it's apart. It's an economics thing.
_________________________
Quaker State across the board.

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#4628892 - 01/09/18 05:17 AM Re: I may have finally had that epiphany [Re: 99Burb454]
joegreen Offline


Registered: 03/10/13
Posts: 760
Loc: NY
I'm going to assume you have a 4l80e. I don't know much about automatic transmissions but I am in the process of rebuilding my th400 which I think is similar to the 4l80e. You might want to check the reverse band apply servo and pin. You can check that with the pan off. Maybe the pin is to short. Also look up into the hole where the pin goes and make sure it can still push on the reverse band. If the lug is broken off the band then reverse won't apply.


Edited by joegreen (01/09/18 05:19 AM)
_________________________
1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le

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#4628928 - 01/09/18 06:47 AM Re: I may have finally had that epiphany [Re: 99Burb454]
skyactiv Offline


Registered: 03/02/13
Posts: 4399
Loc: The Midwest
Your first sentence is stating you just returned home from the auto parts store. I'd get rid of that money pit that nickle & dimes you and requires a lot of time spent to keep it on the road.
_________________________
Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual

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#4628976 - 01/09/18 08:13 AM Re: I may have finally had that epiphany [Re: 99Burb454]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
And... it would seem someone in the situation you're currently in with their vehicle has no room to talk about finding the small, single thing causing the problem and fixing it right. Fowvay is right, there is logic behind the usual practice of overhauling the whole unit if the repair is not obvious and easily accomplished with the unit in the vehicle. This rule is as true of automatic transmissions as it is of any large conponent in the car.

The pump is going out in my Turbo 400 - if it sits more than half a day it takes several minutes playing with the shifter just to get the forward gears to engage, and will sometimes go back into neutral at a stop. It drips from the front of the trans. while it's running and leaves a puddle the size of a sheet of paper every time it's shut off for a while. The transmission has to be removed to change the pump. The transmission was not rebuilt recently so all the components have 33 years and 128,000 miles on them. I could pull the thing and replace the pump for <$200? and go on, and wind up doing it again in another couple years and <20,000 miles when something else fails - or be realistic and spend my money and time more wisely, and wait until I can rebuild it and know it's good for another 100,000+ without trouble.

Would you replace spark plugs one by one as individual cylinder misfires show up?


Edited by Alex_V (01/09/18 08:14 AM)
_________________________
I like Chevy and Valvoline.

'13 Cruze, 1.4T, 112K
'85 GMC C3500, 454, 130K
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#4629075 - 01/09/18 10:08 AM Re: I may have finally had that epiphany [Re: skyactiv]
SilverSnake Online   content


Registered: 05/29/13
Posts: 592
Loc: Florida
Originally Posted By: skyactiv
Your first sentence is stating you just returned home from the auto parts store. I'd get rid of that money pit that nickle & dimes you and requires a lot of time spent to keep it on the road.


This is good advice. It will definitely "fix" the issue.
_________________________
2016 Charger, 6.4L-485 HP (PUP 0W-40)
2017 BMW 330i, 2L-248 HP (BMW 0W-20)
2018 Jeep GC, 5.7L-360 HP (PUP 5W-20)
2008 20KW Generac (Amsoil 10W-30/30)

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#4629104 - 01/09/18 10:33 AM Re: I may have finally had that epiphany [Re: 99Burb454]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1810
Loc: Saskatchewan, Canada
I have to agree with those who say don't just jump to a rebuilt or new transmission from the shop. I spent about $300, replaced some aging parts and while I was in there I upgraded the transmission in my RAM 1500 to the Heavy Duty Diesel Engine spec, works like a charm. Not every auto trans issue can be fixed by a backyard mechanic with ordinary experience, but you can probably do more than you might think at first.

I'd never done any (auto) transmission work myself before, with good instructions and careful planning it's no big deal. They are complex and daunting at first glance and modern versions have modern improvements but in the end they all work the same, and it's 1950's technology.
_________________________
'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]

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#4629106 - 01/09/18 10:36 AM Re: I may have finally had that epiphany [Re: 99Burb454]
irv Offline


Registered: 10/08/06
Posts: 1074
Loc: Oshawa, Ont. Canada
Sounds like the sunshell gear to me, but I am surprised it works occasionally?
https://www.youtube.com/watch?v=Gg4tLMCk2a8

Mine went out of my 97 Sierra ext cab with a 5.7 at a 144,000 km's. Common problems with these trannies, and as others have said, it's time for a rebuild or a new transmission. I am not sure why anyone would want to continue dealing with these issues month after month?
_________________________
2017 Chevy Impala 3.6 Ltr.
2013 Ram Hemi Bighorn QC 4x4
PP and/or PUP for both vehicles.

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