Re: 2001 Ram Van 3500 transmission questions
[Re: cudaman1969]
#2419115
12/15/17 06:08 PM
12/15/17 06:08 PM
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John_Kunkel
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The traditional speedo drive disappeared in '98. Gear and tire changes have to be flashed with a DRB to correct the speedo.
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Re: 2001 Ram Van 3500 transmission questions
[Re: John_Kunkel]
#2419125
12/15/17 06:27 PM
12/15/17 06:27 PM
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cudaman1969
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The traditional speedo drive disappeared in '98. Gear and tire changes have to be flashed with a DRB to correct the speedo.
Thanks, but not what I wanted to hear. Wait, is this easy to do with a hand held tool?
Last edited by cudaman1969; 12/15/17 06:28 PM.
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Re: 2001 Ram Van 3500 transmission questions
[Re: cudaman1969]
#2419292
12/16/17 12:27 AM
12/16/17 12:27 AM
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383man
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From what I remember thats done through the ABS module. Because all rear drive trucks and Vans have at least RWAL on that year with the sensor in the rear diff for rear wheels ABS opperation and speedo opperation also. The RWAL is rear anti-lock brakes as all trucks of that year have at least rear anti-lock brakes and some have all four wheel anti-lock brakes. You can set it as was said with the Mopar DRB scanner as I remember it had a bunch of different tire sizes and different rear ends you had to program in it so it knows the gear ratio and tire size. I also believe if you have a tire size thats not an option in the scanner you can get the "revs per mile" for the size tire you have and set it by that. I used to have a chart they gave us on revs per mile by tire size but I believe most tire stores can tell you that also. Ron
Last edited by 383man; 12/16/17 12:32 AM.
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Re: 2001 Ram Van 3500 transmission questions
[Re: cudaman1969]
#2419411
12/16/17 11:48 AM
12/16/17 11:48 AM
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383man
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Thank you all for your input. If I bring this van to a dealer after changing gear, will they give me any flack for this? No its your Van and you can do as you like to it. But on the scanner it would ask for what diff was in it as it knew the gear ratio by which diff was in it so with the gear ratio changed by you in the stock diff I dont remember what other option it gives. Back when I was still at the dealer (I retired in 2011) the scanner did not ask for gear ratio it just asked for which diff was in it and tire size or revs per mile. But the scanner today may be updated more and may have the gear ratio option in it now. Apparently only one gear ratio came in the few diffs that were an option on them. Because the scanner would just ask if it was an 8-1/4 or 9-1/4 diff and so on it did not ask for actual gear ratio back when I was still at the dealer. You can call or stop at a local Mopar dealer and tell them what you did first and see what they say as like I said they may have more options today to set the specs in the ABS module. We usually called it setting the pinion factor. Thats because it was called that on front drive vehicles. Good luck , Ron
Last edited by 383man; 12/16/17 11:50 AM.
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Re: 2001 Ram Van 3500 transmission questions
[Re: 383man]
#2419447
12/16/17 01:28 PM
12/16/17 01:28 PM
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cudaman1969
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Thank you all for your input. If I bring this van to a dealer after changing gear, will they give me any flack for this? No its your Van and you can do as you like to it. But on the scanner it would ask for what diff was in it as it knew the gear ratio by which diff was in it so with the gear ratio changed by you in the stock diff I dont remember what other option it gives. Back when I was still at the dealer (I retired in 2011) the scanner did not ask for gear ratio it just asked for which diff was in it and tire size or revs per mile. But the scanner today may be updated more and may have the gear ratio option in it now. Apparently only one gear ratio came in the few diffs that were an option on them. Because the scanner would just ask if it was an 8-1/4 or 9-1/4 diff and so on it did not ask for actual gear ratio back when I was still at the dealer. You can call or stop at a local Mopar dealer and tell them what you did first and see what they say as like I said they may have more options today to set the specs in the ABS module. We usually called it setting the pinion factor. Thats because it was called that on front drive vehicles. Good luck , Ron Thanks Ron
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Re: 2001 Ram Van 3500 transmission questions
[Re: cudaman1969]
#2419535
12/16/17 05:47 PM
12/16/17 05:47 PM
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HotRodDave
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They don't need any flashing to change gear ratios. The tone wheel is on the ring gear and is not affected by gear changes, it still turns the same rpm as the tire no matter what gear is in it. However changing tire diameter will change your speedometer. The actual rear end may have different number of tone wheel teeth but I have never counted them and never been asked by my mac, snap-on scanners or the old DRBIII what diff is in one when programing the "pinion factor" as they call it so I would suspect they are all the same.
Are you sure you got a dana in it? I have two of those vans and they both have 9.25 rear ends in em. Also both of them have 3.92 gears, ones an 01 and ones a 92.
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Re: 2001 Ram Van 3500 transmission questions
[Re: HotRodDave]
#2419559
12/16/17 06:43 PM
12/16/17 06:43 PM
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cudaman1969
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They don't need any flashing to change gear ratios. The tone wheel is on the ring gear and is not affected by gear changes, it still turns the same rpm as the tire no matter what gear is in it. However changing tire diameter will change your speedometer. The actual rear end may have different number of tone wheel teeth but I have never counted them and never been asked by my mac, snap-on scanners or the old DRBIII what diff is in one when programing the "pinion factor" as they call it so I would suspect they are all the same.
Are you sure you got a dana in it? I have two of those vans and they both have 9.25 rear ends in em. Also both of them have 3.92 gears, ones an 01 and ones a 92. Well I be damned, that sounds so easy! Yes a Dana 60, 4.10 on the tag
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Re: 2001 Ram Van 3500 transmission questions
[Re: HotRodDave]
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12/17/17 02:03 AM
12/17/17 02:03 AM
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383man
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[quote=HotRodDave]They don't need any flashing to change gear ratios. The tone wheel is on the ring gear and is not affected by gear changes, it still turns the same rpm as the tire no matter what gear is in it. However changing tire diameter will change your speedometer. The actual rear end may have different number of tone wheel teeth but I have never counted them and never been asked by my mac, snap-on scanners or the old DRBIII what diff is in one when programing the "pinion factor" as they call it so I would suspect they are all the same.
Are you sure you got a dana in it? I have two of those vans and they both have 9.25 rear ends in em. Also both of them have 3.92 gears, ones an 01 and ones a 92.
Dave is right as I appoligize as I actually do know that but was not thinking in the right mode as I just forgot about that. As Dave said it reads off the tone gear thats behind the ring gear in the rear diff and dumb me should have remembered thats why the scanner asks for the type diff and not a gear ratio. Just tire size or changing to a different style diff may affect it as like Dave I dont know if the tone rings from one style diff to the other have different number teeth. Course you can have the tire size or revs per mile set. Do have any friends with a scanner that could set it for you or maybe if you know a Mopar tech you can slip him a couple bucks to do it on the side ? Good luck with it and again I am sorry that I just forgot about the sensor reading the tone wheel which dont change when you change ring and pinion. All I ever used was the Mopar DRBIII scanner since I worked at a Dodge dealer and could use it whenever I liked but as Dave said many other scanners should be able to do it. Ron
Last edited by 383man; 12/17/17 02:06 AM.
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Re: 2001 Ram Van 3500 transmission questions
[Re: 383man]
#2419924
12/17/17 05:21 PM
12/17/17 05:21 PM
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cudaman1969
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[quote=HotRodDave]They don't need any flashing to change gear ratios. The tone wheel is on the ring gear and is not affected by gear changes, it still turns the same rpm as the tire no matter what gear is in it. However changing tire diameter will change your speedometer. The actual rear end may have different number of tone wheel teeth but I have never counted them and never been asked by my mac, snap-on scanners or the old DRBIII what diff is in one when programing the "pinion factor" as they call it so I would suspect they are all the same.
Are you sure you got a dana in it? I have two of those vans and they both have 9.25 rear ends in em. Also both of them have 3.92 gears, ones an 01 and ones a 92.
Dave is right as I appoligize as I actually do know that but was not thinking in the right mode as I just forgot about that. As Dave said it reads off the tone gear thats behind the ring gear in the rear diff and dumb me should have remembered thats why the scanner asks for the type diff and not a gear ratio. Just tire size or changing to a different style diff may affect it as like Dave I dont know if the tone rings from one style diff to the other have different number teeth. Course you can have the tire size or revs per mile set. Do have any friends with a scanner that could set it for you or maybe if you know a Mopar tech you can slip him a couple bucks to do it on the side ? Good luck with it and again I am sorry that I just forgot about the sensor reading the tone wheel which dont change when you change ring and pinion. All I ever used was the Mopar DRBIII scanner since I worked at a Dodge dealer and could use it whenever I liked but as Dave said many other scanners should be able to do it. Ron Don't be hard on yourself, you responded to my post and I appreciate it. I wouldn't hesitate to ask you more questions in the future. At this age we all have a little brain fade, sorry to say. LOL Mike
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Re: 2001 Ram Van 3500 transmission questions
[Re: cudaman1969]
#2420020
12/17/17 09:11 PM
12/17/17 09:11 PM
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A727Tflite
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There are two sensors if I recall correctly. The RWAL which reports the speed of the vehicle and then a sensor that reports driveshaft speed.
2WD has the trans sensor in the OD unit and the 4WD has it in the t/fer case. Lose the trans sensor and the trans is in limpin/default. Loose the RWAL sensor and you lose the speedo.
If I recall correctly when changing the axle ratio you have to compensate by telling the PCM what the ratios is. I think that is what Ron was thinking - regarding the "pinion factor" which is normally the term we use on the FWD -
The algorithm in the PCM uses shaft speed to control shift schedule. You may not see a big difference by leaving it where it's at - but if you do you can change the factor to dial it in.
Last edited by Transman; 12/17/17 09:13 PM.
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Re: 2001 Ram Van 3500 transmission questions
[Re: A727Tflite]
#2420130
12/18/17 01:16 AM
12/18/17 01:16 AM
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cudaman1969
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There are two sensors if I recall correctly. The RWAL which reports the speed of the vehicle and then a sensor that reports driveshaft speed.
2WD has the trans sensor in the OD unit and the 4WD has it in the t/fer case. Lose the trans sensor and the trans is in limpin/default. Loose the RWAL sensor and you lose the speedo.
If I recall correctly when changing the axle ratio you have to compensate by telling the PCM what the ratios is. I think that is what Ron was thinking - regarding the "pinion factor" which is normally the term we use on the FWD -
The algorithm in the PCM uses shaft speed to control shift schedule. You may not see a big difference by leaving it where it's at - but if you do you can change the factor to dial it in. There's only 300 rpm difference at 70 but if a problem I guess to the dealer I go. Moved the van around today, went into drive ok, a little slow into reverse (2 sec.) whines while moving and fluid is black. I'm definitely pulling the trans, but any ideas before I get it out? I changed out the pressure valve? solenoid? (a gm hybrid affair) in my 06 diesel, does the 01 trans have the same thing? Any good upgrades for the trans? Thanks Mike
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Re: 2001 Ram Van 3500 transmission questions
[Re: cudaman1969]
#2420900
12/19/17 12:58 PM
12/19/17 12:58 PM
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383man
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[quote=HotRodDave]They don't need any flashing to change gear ratios. The tone wheel is on the ring gear and is not affected by gear changes, it still turns the same rpm as the tire no matter what gear is in it. However changing tire diameter will change your speedometer. The actual rear end may have different number of tone wheel teeth but I have never counted them and never been asked by my mac, snap-on scanners or the old DRBIII what diff is in one when programing the "pinion factor" as they call it so I would suspect they are all the same.
Are you sure you got a dana in it? I have two of those vans and they both have 9.25 rear ends in em. Also both of them have 3.92 gears, ones an 01 and ones a 92.
Dave is right as I appoligize as I actually do know that but was not thinking in the right mode as I just forgot about that. As Dave said it reads off the tone gear thats behind the ring gear in the rear diff and dumb me should have remembered thats why the scanner asks for the type diff and not a gear ratio. Just tire size or changing to a different style diff may affect it as like Dave I dont know if the tone rings from one style diff to the other have different number teeth. Course you can have the tire size or revs per mile set. Do have any friends with a scanner that could set it for you or maybe if you know a Mopar tech you can slip him a couple bucks to do it on the side ? Good luck with it and again I am sorry that I just forgot about the sensor reading the tone wheel which dont change when you change ring and pinion. All I ever used was the Mopar DRBIII scanner since I worked at a Dodge dealer and could use it whenever I liked but as Dave said many other scanners should be able to do it. Ron Don't be hard on yourself, you responded to my post and I appreciate it. I wouldn't hesitate to ask you more questions in the future. At this age we all have a little brain fade, sorry to say. LOL Mike Thank you as I appreciate that. At 61 I sure do get a little brain fade once in a while. There is another speed sensor in the trans tail housing and its for just the trans shifting as far as what I was taught. I guess it could be used as back-up for the PCM if it lost the rear diff speed sensor. Thats important for the PCM to know the trans output shaft speed so it can control gov pressure for proper shifts. I actually had a few go south on me over the years that came in the shop. I remember one truck I had that was doing all kind of crazy shifting and it had not set any codes. A few guys said I should replace the Gov pressure sensor and duty cycle solenoid but I decided to watch and record all the sensor when I drove it acting up. And I saw right away it had to trans tailshaft speed rpm for that sensor and of course it worked fine after I replaced it. I could be wrong but I was always told at training that speed sensor in the trans tail housing is just for the electronic gov so the PCM knows driveshaft speed to control the Gov pressure duty cycle solenoid and that the rear diff sensor hats for the ABS is for ABS operation of course and speedo operation. It was great at the Dealer as when I got weird problems that did not set codes I just put our Co-Pilot (data recorder) on the vehicle and drove it and then when back in the shop just download the info to the shop computer and then I could just take my time to looks it all over and see if I see the problem. It was so much better then have someone trying to look at the scanner info while driving. Ron
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