4th Gen Ram Tech 2009 - 2018 Rams and the 2019 Ram Classic: This section is for TECHNICAL discussions only, that involve the 2009 - 2018 Rams and the 2019 Ram Classic. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

LSD/Gear Change quote

Thread Tools
 
Search this Thread
 
Old Feb 19, 2010 | 11:10 AM
  #21  
chambers's Avatar
chambers
Record Breaker
Joined: Dec 2008
Posts: 1,605
Likes: 1
From: VA
Default

Originally Posted by oldjeep
If you stuck with the same sized tires you would need to either take it in to the dealer to have them starscan it so that the speedo reads correctly - or use one of the aftermarket tuners that has that functionality.
On the 3rd gens you don't have to have the speedo adjusted for just a ring and pinion swap, so I assume it's the same on the 4th gens. Now if you change the tire size then you need the dealer or a tuner to correct the speedo.
 
Reply
Old Feb 19, 2010 | 11:48 AM
  #22  
05Dakotaho's Avatar
05Dakotaho
Record Breaker
Joined: Nov 2009
Posts: 1,077
Likes: 0
From: Austin, TX
Default

Originally Posted by chambers
On the 3rd gens you don't have to have the speedo adjusted for just a ring and pinion swap
How does that work? I'm gonna need some convincing.
 

Last edited by 05Dakotaho; Feb 19, 2010 at 11:51 AM.
Reply
Old Feb 19, 2010 | 11:59 AM
  #23  
oldjeep's Avatar
oldjeep
Champion
Joined: May 2009
Posts: 3,497
Likes: 1
From: MN
Default

Originally Posted by chambers
On the 3rd gens you don't have to have the speedo adjusted for just a ring and pinion swap, so I assume it's the same on the 4th gens. Now if you change the tire size then you need the dealer or a tuner to correct the speedo.
I wonder if they are running off one of the ABS sensors. I did notice that when I unplugged the ABS relay during my ABS issues that the speedo and odo did stop working.
 
Reply
Old Feb 19, 2010 | 12:01 PM
  #24  
smokeNhope's Avatar
smokeNhope
Registered User
Joined: Apr 2009
Posts: 48
Likes: 0
From: Alberta
Default

yeah the speedometer is read off the wheel speed indicators, only thing I was wondering about as far as computer goes for a gear swap is, if going from open to LSD, how will it affect the way the ESP and how soon it engages to stop wheel spin, will the 2 systems be fighting each other, and also the transmission shift points.....
 
Reply
Old Feb 19, 2010 | 12:17 PM
  #25  
Coolidge's Avatar
Coolidge
Professional
Joined: Jan 2010
Posts: 205
Likes: 0
Default

Originally Posted by oldjeep
A detroit locker is in no way selectable. It's an automatic dog clutch locker. The only mass produced selectable lockers around are the ARB, OX, Yukon Zip Locker and the Eaton E-locker.

A true track is only an LSD in the sense that it slips ( a whole lot). Rather than clutches it uses a hokey helical gear setup. Never met anyone who owned them who liked them - been at least 3 guys in my club who have thrown them away. If you want an LSD, then an auburn is a much better choice.
Oldjeep it sounds like you know your gears, what's your opinion of the stock Ram 3.92 LSD?
 
Reply
Old Feb 19, 2010 | 12:26 PM
  #26  
oldjeep's Avatar
oldjeep
Champion
Joined: May 2009
Posts: 3,497
Likes: 1
From: MN
Default

Originally Posted by Coolidge
Oldjeep it sounds like you know your gears, what's your opinion of the stock Ram 3.92 LSD?
No idea who makes it or what kind it is. I've got 3.21's and the traction control works well enough for me in a 2wd street truck. Only time I really wish I had a locker is dead starts on ice - when the esp stops the tires entirely - then I just switch it off and roast them.
 
Reply
Old Feb 19, 2010 | 01:40 PM
  #27  
chambers's Avatar
chambers
Record Breaker
Joined: Dec 2008
Posts: 1,605
Likes: 1
From: VA
Default

Originally Posted by smokeNhope
yeah the speedometer is read off the wheel speed indicators, only thing I was wondering about as far as computer goes for a gear swap is, if going from open to LSD, how will it affect the way the ESP and how soon it engages to stop wheel spin, will the 2 systems be fighting each other, and also the transmission shift points.....
Well I don't think there is any special programing between a truck w/ an open diff. and one w/ the mopar lsd, but you could always call the service department and ask. The tranny shifts at certain rpm and depending on how quickly you accelerate, and since the speedo and tach aren't effected by a gear swap there shouldn't be an issue. I've never heard of anyone having one on the 3rd gens after a gear swap and they have the same tranny and diff.

The mopar LSD's did have an issue w/ the c clips breaking and sometimes grenading the rear, but I believe the c clips are bigger and stronger now. If you're gonna put an lsd in then just get an aftermarket one like the auburn or DTT.
 
Reply
Old Feb 19, 2010 | 02:48 PM
  #28  
05Dakotaho's Avatar
05Dakotaho
Record Breaker
Joined: Nov 2009
Posts: 1,077
Likes: 0
From: Austin, TX
Default

Originally Posted by Coolidge
...what's your opinion of the stock Ram 3.92 LSD?
It's a Dana 44 rear end with stacked metal to metal clutches on the spider gears for LSD. Not highly rated by the experts.

did have an issue w/ the c clips breaking and sometimes grenading the rear
clip mentioned above is adjacent to the index finger in the photo

Name:  DSCN0509.jpg
Views: 41
Size:  68.1 KB
 

Last edited by 05Dakotaho; Feb 19, 2010 at 02:52 PM.
Reply
Old Feb 19, 2010 | 03:15 PM
  #29  
chambers's Avatar
chambers
Record Breaker
Joined: Dec 2008
Posts: 1,605
Likes: 1
From: VA
Default

The ram uses a chrysler 9.25 rear for the 3rd and 4th gen 1500's, I'm not sure about the 2nd gens.
 
Reply
Old Feb 19, 2010 | 03:26 PM
  #30  
oldjeep's Avatar
oldjeep
Champion
Joined: May 2009
Posts: 3,497
Likes: 1
From: MN
Default

If the pictures here are accurate, the factory lsd appears to be a trac loc.

http://www.dakota-durango.com/forum/...ad.php?t=91729
 
Reply



All times are GMT -4. The time now is 12:11 PM.