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2002 dodge ram 12v conversion

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  #1  
Old 12-18-2013, 08:51 PM
Justinryan2022 Justinryan2022 is offline
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Smile 2002 dodge ram 12v conversion

Im new to this, just wanted to see if i could get some help. I have a 2002 dodge ram 1500 that i put a 1993 12v cummins with transmission in. The top speed is around 75mph. Thats not good enough for me. I believe it's getting horrible gas mileage going down highway because of it. I think it has the 46rh transmission not sure though. What could i do to increase top speed?
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Last edited by Justinryan2022; 12-26-2013 at 03:22 PM.. Reason: edited to add truth
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  #2  
Old 12-19-2013, 12:40 AM
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Welcome aboard i guess. Hope you have a great time up here at this community.
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Old 12-19-2013, 08:01 AM
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Welcome to DF. Moving to the correct section.
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Old 12-19-2013, 09:11 AM
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Quote:
Originally Posted by Justinryan2022 View Post
Im new to this, just wanted to see if i could get some help. I have a 2002 dodge ram 1500 that i put a 1993 12v cummins with transmission in. The top speed is around 75mph. Thats not good enough for me. Im 18 years old and i lik to go. I think it has the 46rh transmission not sure though. What could i do to increase top speed?
If 75mph is not good enough for you then you need a car and not a truck...

I'm not sure to what extent you did your swap, but I'd assume that the limiter on the 93's was around 75mph...
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Old 12-19-2013, 09:25 AM
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replace/change governor.

change the final drive gear ratios. lower numbers
if you have 3:55 .. then replace to 3:00 or lower.

if 4 wheel drive .. both finals need changed.

better off with a car.. smaller size, less weight, better handling,

or get a Hemi Dodge truck. you got yours setup for Work, NOT SPEED.

my opinion.
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Old 12-19-2013, 10:14 AM
Justinryan2022 Justinryan2022 is offline
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I have 3 55 gears in the rear end. I know it's not going to be lighting fAst. I want to be able to go 70mph with ease not maxed out. Would I newer transmission help? Like out of a 1995 dodge ram 2500
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Old 12-19-2013, 11:15 AM
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You have to make sure you won't over rev the engine's RPM and/or Load Rating.... The Higher the speed the more load you are putting on the engine.

You will likely need to change the rear end gearing as well as the transmission to see any decent gain without losing a whole lot of torque....

Also make sure you keep an eye on the welded frame joints, with all that added weight from the engine as well as the increase in torque you might end up with some stress cracks...
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Old 12-19-2013, 11:18 AM
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Are you running a manual or automatic transmission by the way?
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Old 12-19-2013, 11:35 AM
Justinryan2022 Justinryan2022 is offline
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I am running a automatic transmission. Do I need to get higher gears? And doesn't the motor only weigh 400lbs more?
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Old 12-19-2013, 12:05 PM
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I am running a automatic transmission. Do I need to get higher gears? And doesn't the motor only weigh 400lbs more?
Yes but there is a lot more torque to worry about, so just keep an eye out for it.

Anyways... Your PCM is only going to handle the same transmission as you have currently, so you'll likely end up in the Aftermarket ECU/PCM world... You could go with a manual transmission but then you'll still need a different PCM to prevent CEL from coming up.
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Old 12-19-2013, 01:29 PM
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torque.. the love of the gods... rip motor mounts, crack / break metal frames.. etc.

just looking for 15 - 20 miles per hour... more...

3:00 to 1 rear gears... or 2:80 to 1 .. BUT the truck will move from a STOP a little bit slower. every thing is a trade off.
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Old 12-19-2013, 07:06 PM
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Well, there is a reason Dodge didn't put the Cummins in the 1500s. The diesel won't rev as high as the gasser. You'll top the motor out pretty quick.
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Old 12-24-2013, 09:28 AM
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Take some pics and tell us more about the engine swap. Those 12 valves have a lotta potential when setup right.
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Old 12-24-2013, 09:53 AM
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well for starters here are a couple of sites that are dedicated to us diesel conversion nuts

http://www.dieselbombers.com/ http://www.4btswaps.com/forum/forum.php

first of all for what you want you can do a couple of things you want to keep the 47rh it is a manual shift trans and you wont need a stand alone computer there are a couple of final drive options you can do might give you 5 mph I would make sure you are shifting into overdrive sounds like you are not to me change the gear ratios you can change tire sizes some to achieve what you want

you can change Governor springs you should have a ve pump

I hope you did some frame and suspension work on the 1500 that engine weighs 1000lbs and stock has enough torque to twist your frame
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Old 12-24-2013, 10:00 AM
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Quote:
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well for starters here are a couple of sites that are dedicated to us diesel conversion nuts

http://www.dieselbombers.com/ http://www.4btswaps.com/forum/forum.php

first of all for what you want you can do a couple of things you want to keep the 47rh it is a manual shift trans and you wont need a stand alone computer there are a couple of final drive options you can do might give you 5 mph I would make sure you are shifting into overdrive sounds like you are not to me change the gear ratios you can change tire sizes some to achieve what you want

you can change Governor springs you should have a ve pump

I hope you did some frame and suspension work on the 1500 that engine weighs 1000lbs and stock has enough torque to twist your frame
Is that a 4bt you have in your dakota? I want to put one in a ram 1500 and tune it up a bit.
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Old 12-24-2013, 12:25 PM
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no its a b 3.3 it is a industrial engine designed by cummins and komatsu very durable and turbocharged for a full sized pickup I would recommend the 4bt 3.9 p pump engine then use a 47rh or a nv4500 for trans
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Old 12-24-2013, 03:35 PM
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no its a b 3.3 it is a industrial engine designed by cummins and komatsu very durable and turbocharged for a full sized pickup I would recommend the 4bt 3.9 p pump engine then use a 47rh or a nv4500 for trans
How hard was mounting the engine? I'm not worried about electronics, but the fab work would be the hardest part for me.
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Old 12-24-2013, 06:05 PM
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well i used the stock tranny mound because I used a nv3500 and the littler 3.3 engine for what you a looking at I would use the stock tranny mounts the engine I would use a 4bt use some liquid filled motor mounts the pan may have to be modified but that is really no issue it is very doable and has been done already
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Old 12-25-2013, 10:43 AM
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Yes but there is a lot more torque to worry about, so just keep an eye out for it.

Anyways... Your PCM is only going to handle the same transmission as you have currently, so you'll likely end up in the Aftermarket ECU/PCM world... You could go with a manual transmission but then you'll still need a different PCM to prevent CEL from coming up.

he said he is running a 47 rh not a 47re if he is running a 47rh as he indicated there are a couple of ways to make overdrive work

just to clarify 47rh is a non electronic manual shift trans a 47re is the electronic shift trans


he first needs to make sure what he has if he used the trans from his donor truck then he needs to enable the overdrive and torque converter
lockup

the easiest way to make it all work is on the passenger side there is a port to test the pressure on the trans it produces about 1 psi per mph so get a 55-60 psi ac switch so when you get to 55-60 it will enable the overdrive and torque converter lockup there are some good write up's on this on diesel bombers 4bt conversions and the conversion section on ford truck enthusiasts

now if he is using the the 47re I would get a controller from http://www.fordcummins.com/ or http://www.destroked.com/ these 2 companies deal with cummins conversions



some of us feel that ford put in the 6.0 diesel so that they could be converted to a superior drive train with the cummins conversion
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Old 12-25-2013, 02:47 PM
Justinryan2022 Justinryan2022 is offline
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Thanks for all the advice. I just uploaded some pictures of the truck. I think my transmission might be messed up, im going to rebuild it and see how that helps. Thanks again
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Old 12-25-2013, 02:47 PM
 
 
 
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