8 speed transmission problems, or just how it is?

[16RamHemi]

I just purchased my 16 Big horn. 5.7 with the 8speed tranny. 20k. Right away ,i noticed the issue of the bump ,when cold from 2nd to 1st. I took it back to the dealer, and of course they told me, they couldnt find any issues. Looking through this forum, and other sites on line. It seems this is a common issue. But im not seeing any remedies for the issue. Also im surprised that Chrysler hasnt taken any liability at this point

try to brake harder coming to a stop. in my last ram, a 16 with 392 gears i could make it do the 2 to 1 bump whenever i wanted it to. basically it would do it when braking harder coming to a stop. when braking early and coming in slow to a stop it wouldnt do it. try that on your own. if you can get consistent results, tell the tech to drive it like that. just because it is common doesnt mean it should do it. ask them: so all trucks do this? answer is no. so whose truck has the problem, those that do it or those that dont.

 

[chrisbh17]

Funny, I was just doing the same thing this morning. If I pump the brakes to get to a stop, then back off them completely and then apply very little pedal pressure, I get zero bump from 2-1. If I pump the brakes to come to a stop and just hold them through the 2-1 shift, I get a bump.

Note that once the trans is warm (150+ or so), I get no bump ever.

 

[rgenereux420]

so I had the FCA help out with the dealer about getting mine fixed. they told me it was a recal with the trans that was a big update for the transmission. I have had the truck one day. it seems better but its gonna need some time to see if it acts up like before. I will keep you all posted. so far so good tho.

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[rgenereux420]

Quick update - On the phone with the dealership earlier they said there is a transmission recall (might just be a software update?) as of a few days ago. I'm taking my truck in Wednesday for the tailgate recall and this new recall. I'm also going to tell them about the issues I've discussed here. Maybe the transmission software update will help, we'll see.

any update on yours ?

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[pa_ram_1500]

Any update?

My 2016 started doing the bump in December after the power train module recall (software update). The bump happens every time I stop and it's hard enough that it feels like I'm getting rear ended. Pushing the Tow/Haul button immediately stops the problem, so I'm thinking it has to be software related.

Since January, my truck has been back to the dealership six times and it's still not fixed. They've reflashed the power train module twice, replaced the power train module, changed out the shift cylinders, applied multiple updates, and have done 3 transmission quick learns. Nothing has helped. The most recent trip to the dealer was last week and they didn't mention anything about a recall.

 

[chrisbh17]

so I had the FCA help out with the dealer about getting mine fixed. they told me it was a recal with the trans that was a big update for the transmission. I have had the truck one day. it seems better but its gonna need some time to see if it acts up like before. I will keep you all posted. so far so good tho.

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Any paperwork? Curious if there is a new update.

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[madtrucker2016]

Of course the dealership will be quick to change a trans over small symptoms like this. Its quick, easy warranty work for them.

I wouldnt be worried about a firm shifting trans that still operates. The 8 speed is a bullet proof proven trans that is HARD to tear up. Theres guys with 700+ hp in trucks running around beating the snot out of the stock 8 speed trans with zero issues. If a long or firm shift were a sign of things to come those guys would have been tearing them up.

I'd be more worried about having to spend $2000+ for a lifter/cam change at 130,000 thats a known problem.

I just read a article about the 8 speed trans in our trucks many other car company's use this tranny they wrote the same its bullet proof tough and dependable some guys panic and all this stuff races into their heads

 

[joels]

I have a 2019 classic with 5000 miles and it is doing the same thing. Bump 2-1 when stopping and 1-2 when accelerating. Became noticeable around 4000 miles and now happens almost 8 of 10 times. Passengers feel it too. On the forums some say the drive shaft needs to be lubricated, some say it’s a relearn and software update. Some say it’s valve body replacement or transmission replacement. Has anybody found a solution? I’ve read posts from 2014 and 2015 with people mentioning the same thing on their RAM trucks back then. I can’t believe after 5 years there is still no cure for this.

 

[Troy Gillis]

the drive shaft needs to be lubricated

.. Is that lube in the same isle as blinker fluid?

 

[crash68]

.. Is that lube in the same isle as blinker fluid?

I bet if you go ask on a Prius forum they'll show how to properly fill your blinker fluid.


A lot of these trucks are built with a two piece drive shaft that allows a greater range of expansion/contraction. There are splines under a black accordion boot in the drive shaft that needs to be lubed. Neverseize works good on the splines for the driveshaft.

 

[Dean Godfrey]

The CCSB trucks with the 2 piece driveshaft do not have the typical slip yoke but instead have a collapsible section that can change length based on differential movement. Depending on tolerances and/or lubricant condition between the sliding pieces of the driveshaft, it may momentarily stick during extension or contraction resulting in a thump when stopping or accelerating from a stop. This can be temperature sensitive due to changes in the viscosity of the lubricant as well as changes in the tolerances within the driveshaft. To avoid the "thump" you could reduce differential housing rotation by replacing rubber suspension bushings with solid pieces or you could install a better lubricant in the driveshaft (copper antiseize works well).

I have the 2014 CCSB w/3.92 gears and I am thinking this is the viable solution.

The dealer replaced my 8 spd under warranty, but like the tech said 'it will be back' and sure enough....its back.
It only 'thumps' at take-off right now, and it feels like its coming from behind the front seats.
I will be having them do this service this week.

Will update ASAP.

 

[guru1ofatl]

I have the 2014 CCSB w/3.92 gears and I am thinking this is the viable solution.

The dealer replaced my 8 spd under warranty, but like the tech said 'it will be back' and sure enough....its back.
It only 'thumps' at take-off right now, and it feels like its coming from behind the front seats.
I will be having them do this service this week.

Will update ASAP.

I have a 2017 and it worked for mine. Make sure to use the copper anti seize though, I tried CV axle grease with moly and it didn't work.

 

[indept]

I have a 2019 classic with 5000 miles and it is doing the same thing. Bump 2-1 when stopping and 1-2 when accelerating. Became noticeable around 4000 miles and now happens almost 8 of 10 times. Passengers feel it too. On the forums some say the drive shaft needs to be lubricated, some say it’s a relearn and software update. Some say it’s valve body replacement or transmission replacement. Has anybody found a solution? I’ve read posts from 2014 and 2015 with people mentioning the same thing on their RAM trucks back then. I can’t believe after 5 years there is still no cure for this.

Take it to dealer. There's an update they can flash that fixes it. I've seen it commented on a few times in this forum.

 

[joels]

I have a 2017 and it worked for mine. Make sure to use the copper anti seize though, I tried CV axle grease with moly and it didn't work.

Guru1ofatl, are you saying that you applied copper anti seize over the splines on the end of the drive shaft that goes into the rear differential? And this cured the bump 2-1 stop and 1-2 accelerate? Did you get your software flashed/updated in addition to that? If so, now when you come to a stop there is no jerk/bump? Any other areas that need lubrication or application of anti seize for this issue?

 

[guru1ofatl]

Guru1ofatl, are you saying that you applied copper anti seize over the splines on the end of the drive shaft that goes into the rear differential? And this cured the bump 2-1 stop and 1-2 accelerate? Did you get your software flashed/updated in addition to that? If so, now when you come to a stop there is no jerk/bump? Any other areas that need lubrication or application of anti seize for this issue?

The driveshaft on the 8 speed crew cab trucks is two piece. The rear section is collapsible and has a rubber boot where the sections slide within one another. I removed the rubber boot, extended that section of the driveshaft, and lubricated the splines with copper anti seize which stopped the bump when stopping or leaving a stop. The truck has not had any flashes performed by the dealer. The only thing to watch out for is to mark the drive shaft sections to ensure that they go back together with the same alignment.

 

[madtrucker2016]

I have a 2017 and it worked for mine. Make sure to use the copper anti seize though, I tried CV axle grease with moly and it didn't work.

Just got back from dealer with same thing all they did was flash the transmission 2016 Laramie with 13,700 miles I think they are going to change it because on way home still what they call it a bump stop will see what happens

 

[JaymanUS]

So. I have that annoying bump stop. 5.7L with 8spd. 2018 RAM 1500. Everyone mentions this issue.. But what about that annoying "bump" "surge" when you first let off of the brake before giving it any gas. Feels like a the trans drops or rear end relaxes down... maybe a stop neutral?? Anyone else?

 

[16RamHemi]

So. I have that annoying bump stop. 5.7L with 8spd. 2018 RAM 1500. Everyone mentions this issue.. But what about that annoying "bump" "surge" when you first let off of the brake before giving it any gas. Feels like a the trans drops or rear end relaxes down... maybe a stop neutral?? Anyone else?

im on my 3rd ram (2@14 and a 16) and i have never felt that. i have only felt the bump coming to a stop on my 16. i would get that looked at asap. not normal. should not do that

 

[joels]

The driveshaft on the 8 speed crew cab trucks is two piece. The rear section is collapsible and has a rubber boot where the sections slide within one another. I removed the rubber boot, extended that section of the driveshaft, and lubricated the splines with copper anti seize which stopped the bump when stopping or leaving a stop. The truck has not had any flashes performed by the dealer. The only thing to watch out for is to mark the drive shaft sections to ensure that they go back together with the same alignment.

How did you manage to take off the rubber boot clamps? Did you use a special tool? Seems like they are crimped. Brake open and replace with new ones? If so, I see that Home Depot sells a crimping tool for this application.

Did you disconnect the drive shaft from the rear differential to extend it? I can’t believe that in less than 5000 miles the entire drive shaft and U joints are all rusted. Everything else looks good under my truck but that whole section even though it’s just surface corrosion, seems a little concerning.

 

[guru1ofatl]

How did you manage to take off the rubber boot clamps? Did you use a special tool? Seems like they are crimped. Brake open and replace with new ones? If so, I see that Home Depot sells a crimping tool for this application.

Did you disconnect the drive shaft from the rear differential to extend it? I can’t believe that in less than 5000 miles the entire drive shaft and U joints are all rusted. Everything else looks good under my truck but that whole section even though it’s just surface corrosion, seems a little concerning.

I used a flat blade screw driver to spread the clamp enough to cut it. A replacement clamp and the installation tool can be purchased at the parts store.
I used a wax pencil to mark the drive shaft halves and differential flange before removing it from the differential. The surface rust seems to be typical so I wouldn't be overly concerned about it.

You may need to take the truck out of park to reinstall the drive shaft so I would look that process up beforehand if you don't already know how to do this.