Advertisement
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Home Who's Online Today's Posts HP Calculator CompD Gift Shop Mark Forums Read
Go Back   Competition Diesel.Com - Bringing The BEST Together > Tech Area- Dodge > Dodge Tech > 03-07 3rd Gen.
Register Members List Timeslips EFI Live Library Invite Your Friends FAQ Calendar Mark Forums Read

Closed Thread
 
Thread Tools
Old 03-18-2018, 07:47 PM   #1
Mazak

Name: Mazak
Title: Diesel Enthusiast
Status: Not Here
Join Date: Jul 2017
Location: SW Ohio
Member`s Gallery
Posts: 230
3.73 to 3.42 gears ?

I have been considering changing my gears on my twin turbo truck to 3.42 . It needs to have a locker installed anyways because it's an open diff.

I don't plan on towing with it. It's an 06 with an automatic.
I am running 305 nitto 420s

What would be the pros and cons of going this route ?

Would a 1/4 mile time be quicker ?
 
Old 03-18-2018, 08:24 PM   #2
Poulina
 
Poulina's Avatar

Name: Poulina
Title: Too Much Time
Status: Not Here
Join Date: Dec 2015
Location: Norcal
Member`s Gallery
Posts: 795
2wd assuming?
__________________
2008 QCLB 6.8 48re Suncoast PCS, DDP supermentals, forcedinductions 467/87, Hamilton 188/220, Carrillos, studded mains w/stock girdle
 
Old 03-18-2018, 08:31 PM   #3
Mazak

Name: Mazak
Title: Diesel Enthusiast
Status: Not Here
Join Date: Jul 2017
Location: SW Ohio
Member`s Gallery
Posts: 230
Quote:
Originally Posted by Poulina View Post
2wd assuming?
No its a 4x4.
 
Old 03-19-2018, 12:20 AM   #4
Cummins6.7trip
 
Cummins6.7trip's Avatar

Name: Cummins6.7trip
Title: Green Behind the Ears
Status: Not Here
Join Date: Aug 2015
Location: Pa
Member`s Gallery
Posts: 76
Subscribed Been thinking about doing that same thing.
 
Old 03-19-2018, 10:07 AM   #5
59turbo

Name: 59turbo
Title: Diesel Enthusiast
Status: Not Here
Join Date: Jul 2010
Member`s Gallery
Posts: 155
I just swapped in 3.42s into my 2wd for track reasons as I’m going through the traps at 3500 rpm and it’s flat at those revs so I’m hoping it picks up the mph. Not sure there is a con to the swap especially if you’re not towing except for the cost in your case of swapping front and rear axles. Cruise rpms are lower at 1700@70 mph, I also have 285 tires. I just thought of a con at least for me, it won’t go into lockup until 55mph now. So far I’m liking them.
__________________
2004 2500 Shortbed reg cab 2wd, Goerend triple disc, Fleece holset, BBi stage 1.5, Fleece 10mm cp3, FASS 150. Best ET to date 11.36@120 with firepunk tuning.
 
Old 03-19-2018, 10:28 AM   #6
turbo2387
 
turbo2387's Avatar

Name: turbo2387
Title: Nipple Fluffer
Status: Not Here
Join Date: Jun 2011
Location: Indiana
Member`s Gallery
Posts: 665
my experience is with 2nd gens, however owning 4 of them with both 4.10 and 3.54's makes this relevant.

swapping from 3.42's to 4.10's pre and post compounds was the best overall money spent on my green truck (600-700HP realm). The taller gear was great if you daily drive your truck and tow very seldom. I feel the best of both worlds is probably a 3.73 with an auto and 3.54's with a stick, as 4.10's are way to low IMO for a manual driver.

it would be hard for me to advise going to a 3.42 regardless. On top of the fact that the0.31 gear change is so small the return for the $2500-$3500 swap isn't going to be all that noticeable. I feel you could spend your money in better places.

egts are much lower while towing. smoke output fell substantially, towing is night and day, I do not beat my transmission to death towing or hot rodding as it shifts through gears instead of working through them. The big down side to the lower gear is highway driving. it is a pain, I do have to drive slower to keep the R's down.
 
Old 03-19-2018, 10:31 AM   #7
turbo2387
 
turbo2387's Avatar

Name: turbo2387
Title: Nipple Fluffer
Status: Not Here
Join Date: Jun 2011
Location: Indiana
Member`s Gallery
Posts: 665
Quote:
Originally Posted by 59turbo View Post
I just thought of a con at least for me, it won’t go into lockup until 55mph now. .
overdrive will be at 44MPH when your getting groceries. with 4.10's and 33 inch tires. with a 47 series transmission
 
Old 03-21-2018, 10:10 AM   #8
59turbo

Name: 59turbo
Title: Diesel Enthusiast
Status: Not Here
Join Date: Jul 2010
Member`s Gallery
Posts: 155
Quote:
Originally Posted by turbo2387 View Post
overdrive will be at 44MPH when your getting groceries. with 4.10's and 33 inch tires. with a 47 series transmission
Mine used to be 4th then lockup at 48-50 mph with stock size tires and 3.73. Lock up at 55 now isn’t that bad just takes getting used to.
__________________
2004 2500 Shortbed reg cab 2wd, Goerend triple disc, Fleece holset, BBi stage 1.5, Fleece 10mm cp3, FASS 150. Best ET to date 11.36@120 with firepunk tuning.
 
Closed Thread

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 09:19 PM.

 


Powered by vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2006 - 2024, CompetitionDiesel.com
all information found on this site is property of www.competitiondiesel.com