Bigger tire problems

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ggbig

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Being new to the vehicle,and the site,I expect to get schooled by the ones that know,so Im all for it. Anyway,2001 1/2 ,dodge ram 2500,5.9l cummins- my daughter decided to bring a deisel into the jeep family and the last time I worked on one was in the USMC on the tanks. On our jeeps,anytime we change tire size or gear ratios we need to reprogram for corrections. Trans shift points,speed,ecs, etc., the first thing she wanted was leveled and 35'sx12.5x 4th gen rims. I have done some research into the reprogramming for speed correction thinking that would help with shift points and have discovered its not thay easy..I took to fb in hopes of an easy answer and got several. Typical fb. Alpha obd is the common answer,however they have sent me an email specifically saying they do not support the 2001. Does anyone know different? Maybe it has limited functions? I feel i need a scanner but the drb 3 is out of the budget. I will try searching the forum for trans mods that will need done to try and prolong the short life of the 47re as it is,if there is a link with that info already, I would appreciate it. Any suggestions on if the reprogramming is even needed for a second Gen to live on 35's? Thank you all!
 

RamDiver

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As far as I know, AlfaOBD and Jscan apps work with vehicles 2006 and up.

AlfaOBD ECU years.jpg


I did find a Smarty S-03 for $650 that will adjust for different wheel sizes.
At least, that is what is advertised. I have no knowledge or experience with this device.


Or this device is $350.

Hopefully, someone with more experience with a 2001 will respond with a better solution.


And, welcome.gif to Ram Forum.
Thank you for your service.

.
 
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ggbig

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Thank you! Ive done a little digging and as far as i understand now,the 2001 uses a differnt obd2 connector and that is why alphaobd will not work. I guess I will call some local dealers and see what kind of loan I may have to get for the 15 min job from them. I'll see if its worth it from there. My next route is to start reading what type of transmission upgrades are common to try and keep it from exploding in the first month after we put them on. We will be doing the level and tires this upcoming week and ill move on to the trans upgrades from there. Any suggestions, transmission wise from people who are running 35's ,I would appreciate it! Thank you all for the responces!!
 

RamDiver

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It might be prudent to complete your research in advance of the modifications.

This could potentially save some grief instead of creating a headache and reacting to the deficiency or failure created. Just saying. :cool:

.
 
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ggbig

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That's kinda what I'm in the process of doing,wouldn't you say? Reading threads and asking questions? What other research would you suggest? I have the manual in pdf and am going through it,but nothing on adding 4th gen rims......
 

Mojo88

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It might be prudent to complete your research in advance of the modifications.

This could potentially save some grief instead of creating a headache and reacting to the deficiency or failure created. Just saying. :cool:

.

As @RamDiver said, many thanks for your service. :cheers:

I would also agree wholeheartedly with his post that I quoted here. Larger tires/wheels affect the entire truck, putting additional stress and strain on every moving part. It will ride harsh, be horribly noisy, have weaker braking, etc, etc. Perhaps it might be wise to educate your daughter about these types of issues. It's absolutely possible that she might not like the truck once all these mods are done.

I'd rather see you spend the money and time on things like modernized sound/nav system, maybe new carpet and other items that will make the truck nicer and more pleasant to drive.

But then again, I am getting older now, so this may not be applicable to a young girl, haha.
 

rzr6-4

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Larger tires/wheels affect the entire truck, putting additional stress and strain on every moving part.
100%, and probly the biggest negative side affect.
It will ride harsh
Not necessarily. Poor tires with stupid offsets can cause things like death wobble (I dealt with that for a long time, no fun) but a moderate size increase on quality tires on wheels that don't stick way out, you should be able to maintain a good ride.
be horribly noisy
Depends on the tire on how much but generally more noisy yes.
have weaker braking
Technically yes, but in my experience you have to go pretty big before that becomes noticeable. Your brakes have more rotating mass that they have to try and slow, but with a good tire you should actually end up with more traction. We have ABS for a reason, because most vehicles have more brakes than they do tires, so grip is more of a concern with a stock-ish set up. So if you go from stock 31s or whatever it is to 33s or maybe even 35s, you may benefit from the bigger tires. 37s or 40s might be where you start to see the brakes themselves having trouble stopping the rotation.
But then again, I am getting older now
And the truth has been revealed, old people just hate fun ;) . Jk of course, don't hit me.

I've had 35s and on my last set went back to 33s, so still bigger than factory but not huge. The big tire game has it's downsides but as long as you know what they are and do your best to minimize them, *I would say* it's worth it.
 

Mojo88

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.....And the truth has been revealed, old people just hate fun ;) . Jk of course, don't hit me.

I've had 35s and on my last set went back to 33s, so still bigger than factory but not huge. The big tire game has it's downsides but as long as you know what they are and do your best to minimize them, *I would say* it's worth it.

LOL, yep, the truth hurts. Older guys generally don't like all the downsides.

But IMO, all the downsides, especially the safety downsides, become more important here....... mainly because the driver is not gonna be the experienced USMC vet. He would definitely be able to adjust and adapt his driving skills, to accommodate things like poorer brakes and handling. But his inexperienced daughter might not. So there's a safety issue here that should also be considered.......

Again, just an older guy speaking here. But I've been through the wringer a few times and seen how some of these things can come back to bite you. As Miyamoto Musashi (perhaps the world's greatest Samurai) famously said, "always be careful, even in small matters". :patriot:
 

RamDiver

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That's kinda what I'm in the process of doing,wouldn't you say? Reading threads and asking questions? What other research would you suggest? I have the manual in pdf and am going through it,but nothing on adding 4th gen rims......

We will be doing the level and tires this upcoming week and ill move on to the trans upgrades from there. Any suggestions, transmission wise from people who are running 35's ,I would appreciate it! Thank you all for the responces!!

Scheduling the changes before the research is complete sounds like pressing ahead with the mods based on perceived satisfaction, unless you already have experience driving lifted Ram trucks with oversized tires.

Sure, many have successfully lifted and installed large tires, but I bet many others have created complications with their once great-riding vehicle. We see them very regularly here, asking how to fix their ride, because it feels like crap.

I am no expert at lifting Ram trucks; I've only completed that mod on a Toyota, many years ago. AFAIK, on Ram trucks, levelled at stock height can accommodate 285s; anything wider needs a lift.

Again, AFAIK, lifting more than 2" requires replacement of other components such as UCAs.
There's a lot of junk available on the market. I would prefer to find the best parts, buy once, modify once, and be happy.


My next route is to start reading what type of transmission upgrades are common to try and keep it from exploding in the first month after we put them on.

I am admittedly very biased, because I've always been a research junkie, decades before the internet became available. I read books and talked to techs. And, also from decades of working in Telecom where a wee error could impact 100s of thousands of users, I prefer to take the proactive route.

Learn all that I can before making changes, and I might choose a slightly different path, depending on what I learn.

Also, in this instance, I would prefer driving the truck for at least a couple of months and gaining an understanding of the baseline performance of how it behaves. The advantage here is knowing what I'm starting with, before I've added mods. Otherwise, you just don't know if the mods created a problem or the truck itself.

And, should you become aware of other deficiencies, they can be corrected first. Once the truck is in perfect running condition, and I'm still sold on the mods, I could press on, knowing all that I can from having researched.

YMMV, and you will find support here to make any changes you want, whenever you want. :cool:

I'm looking at this project from the angle of the best possible success with the least amount of grief. I would also want to be completely cognisant of the safety aspects if it were my daughter.

If I were 25 and hadn't learned some tough lessons, I might just slap it together and go.
The choice is yours either way. No offence intended.

.
 
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joesstripclub

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Thank you! Ive done a little digging and as far as i understand now,the 2001 uses a differnt obd2 connector and that is why alphaobd will not work. I guess I will call some local dealers and see what kind of loan I may have to get for the 15 min job from them. I'll see if its worth it from there. My next route is to start reading what type of transmission upgrades are common to try and keep it from exploding in the first month after we put them on. We will be doing the level and tires this upcoming week and ill move on to the trans upgrades from there. Any suggestions, transmission wise from people who are running 35's ,I would appreciate it! Thank you all for the responces!!
Not sure on the tire height you are changing from, but going up in tire size is essentially the same as a numerically lower rear end gear. I just went from stock 33's to 35's on my Power Wagon, it essentially makes the stock 4.10 rear feel like a 3.90 or so. As many trucks come with a rear diff option (3.73 or 4.10 for example), I cant see you having any transmission issues purely from the oversized tires. It might exacerbate any issues that are already present but its likely some transmission upgrades would help anyway vs stock. Keep us updated what it takes to get your speedo recalibrated. I think the dealer charge is like $150 generally from what I've seen.
 

Rayzaa

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Just got the Rebel (2023) in my profile pic a month ago. Not going to go crazy. Bilstein level kit, and 295/60/20 from the 275/70/18 it has now. So going from 33.16 inch tires to 33.94 inch tires (10.8 wide to 11.66) on 20x10 -18...maybe ill get 20x9 -12. One of those.

I know ill still loose a little MPG. I think 35s can fit but it may also rub a bit and dont want to trim anything. I also have the Alpha ODB to adjust the speedo so speed and MPG will be accurate.
 
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