Dealing with the huge Aisin 2nd to 3rd gear spacing - Dodge Cummins Diesel Forum
4th Gen Cab & Chassis Discussion of performance, powertrain, and non-powertrain on Cab & Chassis Trucks....NO ADVERTISING

 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 02-16-2019, 09:38 AM Thread Starter
Cummins Nut
 
Sledgehammer1's Avatar
 
Join Date: Jul 2015
Location: East TN
Posts: 340
Thanks: 23
Thanked 29 Times in 26 Posts
iTrader Score: 0 reviews
Dealing with the huge Aisin 2nd to 3rd gear spacing

Just curious what others do that find this annoying.
When using Tow haul , the torque converter locks in 2nd gear. Unless I hold the pedal nearly to the floor, the 2nd to 3rd gear shift happens way too soon for the huge space. Just accelerating normal with weight in T/H, the rpms will drop to about 1300rpm when this 2-3 shift happens. Not an issue towing light, but put any decent load (10k+) behind it and combined with any grade and its near useless! I have had it shift to 3rd, quickly figure out its falling on its face then shift right back to 2nd. Or it will lug at 1300rpm barely moving until the grade flatens out enough to gain momentum. Its stupid!! I do have 3.73 and im sure this isnt as noticed in 4.10 trucks, if it is at all. I love this truck and everything about the Aisin AS69RC, but this is the most annoying thing I've ever encountered towing with any of the big 3.

So im stuck either not using t/h so the converter doesnt lock in 2nd and the rpms stay up for the 3rd gear shift....which i dont really like but it does work.

Or using the ERS buttons to hold 2nd gear until about 2200-2300rpm. This is what I usually do. Just kinda hate using the bottons when i dont have to in the other non Aisin trucks.

Or hold it to the floor. Not a fan of this but it does work. Just seems like a lot of unnecessary wear and i dont like beating on my trucks.

Just curious what others do or if im the only one that finds this an issue.


2013 3500 Laramie 68rfe 3.73 HPP

2018 3500 Tradesman Aisin 3.73 C&C CM TM deluxe bed
Sledgehammer1 is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 02-17-2019, 12:39 AM
Cummins Nut
 
Bedlam's Avatar
 
Join Date: May 2017
Location: PNW
Posts: 488
Thanks: 18
Thanked 27 Times in 21 Posts
Garage
iTrader Score: 0 reviews
It's not as noticeable with the 4.44 final ratios and I'm sure it would be even better with the 4.88's if you were willing to give top speed.


To view links or images in signatures your post count must be 3 or greater. You currently have 0 posts.
Bedlam is offline  
post #3 of 5 (permalink) Old 02-17-2019, 01:56 PM Thread Starter
Cummins Nut
 
Sledgehammer1's Avatar
 
Join Date: Jul 2015
Location: East TN
Posts: 340
Thanks: 23
Thanked 29 Times in 26 Posts
iTrader Score: 0 reviews
I figured it would be less noticeable with the numerically higher gear ratios. Im also not sure how much the lower power of the C&C plays into this as Ive not driven a pickup version with the Aisin. There is a very noticeable power difference between my 68rfe pickup and this C&C though so im sure that effects it some. Had I towed with an Aisin C&C before, I would have definitely gotten the 4.10s at minimum.

2013 3500 Laramie 68rfe 3.73 HPP

2018 3500 Tradesman Aisin 3.73 C&C CM TM deluxe bed
Sledgehammer1 is offline  
Sponsored Links
Advertisement
 
post #4 of 5 (permalink) Old 02-17-2019, 02:35 PM
Cummins Nut
 
Bedlam's Avatar
 
Join Date: May 2017
Location: PNW
Posts: 488
Thanks: 18
Thanked 27 Times in 21 Posts
Garage
iTrader Score: 0 reviews
I went from an older pickup to my chassis cab and did not lose/gain horsepower but did gain an additional gear and more torque. I also went from 3.73 gearing to 4.44 but in a truck weighing 3000 lbs more when empty. I think getting 4.44’s allows you to use all six speeds more often and puts the gear spread closer together so you don’t feel that larger gap as much.


To view links or images in signatures your post count must be 3 or greater. You currently have 0 posts.
Bedlam is offline  
post #5 of 5 (permalink) Old 04-04-2019, 04:42 PM
Diesel Freak
 
Join Date: Mar 2013
Location: palmer ak
Posts: 749
Thanks: 34
Thanked 149 Times in 103 Posts
iTrader Score: 0 reviews
With 4.88's I never notice this. Even towing 41,000 lbs in the mountains. I put a throttle booster on it and it made it more responsive. pLus I'm deleted.

2013 Ram 5500 SRW pickup auto 4x4, 4.88 gears, Kelderman air suspension, extreme outback compressor, rickson wheels, toyo 285/70/19.5 M608Z, transfer flow 40g tank, blue lake front and rear winch bumpers, milemarker hydro winch. EFI by HPP, Flo pro muffler, 36x13.5x19.5 super swamper IROK's. The ramman locking hubs, pacbrake LoadLeash, arp 425's,
ridofpwrstroke is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Dodge Cummins Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
New to Me 2015... What's Going On With My 2nd -3rd Gear Aisin Shifts tlukasavige172 4th Gen Powertrain 2 11-08-2017 05:06 AM
2014 3500 Differential Oil Capacity mt1949 2013-2018 General Discussion 6 02-28-2016 12:00 AM
Front and rear diff fluids kev2500 2010-2012 General Discussion 5 02-08-2011 06:34 PM
Timing/power steering gear whine? Bondo07 89-93 Powertrain 11 01-30-2011 09:05 PM
Trans issue (No O/D or Reverse) justacummins 98.5-02 Powertrain 8 01-24-2011 02:23 PM

Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome