Notices
1999 - 2003 7.3L Power Stroke Diesel  
Sponsored by:
Sponsored by: DP Tuner

Trans hard shift sometimes?

Thread Tools
 
Search this Thread
 
Old Apr 26, 2016 | 05:39 PM
  #1  
Gatordog's Avatar
Gatordog
Thread Starter
|
Senior User
Joined: Jun 2015
Posts: 284
Likes: 0
Trans hard shift sometimes?

I have noticed that my trans will shift very hard sometimes. It does it only when I am accelerating hard. Just now when it went to Overdrive it was loud and hard shifting up. Did it before in lower gear, so hard I thought I hit something.

Truck is a dually and is stock except for exhaust. No chips
 
Reply
Old Apr 26, 2016 | 06:58 PM
  #2  
mueckster's Avatar
mueckster
Lead Driver
20 Year Member
Photogenic
Photoriffic
Shutterbug
Joined: Jun 2003
Posts: 8,298
Likes: 24
From: Damon (South East Texas)
Sounds like a worn/sticking line pressure modulator in the Accumulator Valve Body. Fairly easy fix.
 
Reply
Old Apr 26, 2016 | 07:24 PM
  #3  
Gatordog's Avatar
Gatordog
Thread Starter
|
Senior User
Joined: Jun 2015
Posts: 284
Likes: 0
Thanks, I will check next time I drop the pan. Any good YouTube videos on fixing that
 
Reply
Old Apr 26, 2016 | 07:43 PM
  #4  
mueckster's Avatar
mueckster
Lead Driver
20 Year Member
Photogenic
Photoriffic
Shutterbug
Joined: Jun 2003
Posts: 8,298
Likes: 24
From: Damon (South East Texas)
Originally Posted by Gatordog
Thanks, I will check next time I drop the pan. Any good YouTube videos on fixing that
None that I am aware of, but here are the instructions for the Sonnax replacement. http://d2q1ebiag300ih.cloudfront.net...f?v=1431631113 I use the .427 diameter one (third one down), part# 96948-01K
Here is a simple shift kit that includes it. http://dieselinnovations.com/4r100-s...lator-kit.html Wouldn't be a bad idea to change the accumulator springs, also. This kit is not too aggressive.
 
Reply
Old Apr 26, 2016 | 07:51 PM
  #5  
Gatordog's Avatar
Gatordog
Thread Starter
|
Senior User
Joined: Jun 2015
Posts: 284
Likes: 0
http://http://d2q1ebiag300ih.cloudfront.net/uploads/instruction/file/527/36948-19-IN.pdf?v=1431609325
Found this also. Nice Tech help
 

Last edited by Gatordog; Apr 26, 2016 at 08:21 PM. Reason: Link
Reply
Old Apr 27, 2016 | 07:12 AM
  #6  
mueckster's Avatar
mueckster
Lead Driver
20 Year Member
Photogenic
Photoriffic
Shutterbug
Joined: Jun 2003
Posts: 8,298
Likes: 24
From: Damon (South East Texas)
Not that it couldn't be a problem, but I haven't seen any trouble with that piston on any of the valve bodies I've dealt with. The only other thing I like to change is the accumulator regulator valves. They have been know to stick and cause shift problems. TransGo E4OD/4R100: E4-VL-LR3 I see they new include a stock .372 line pressure modulator valve in this kit.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Mud-and-Guts
1987 - 1996 F150 & Larger F-Series Trucks
12
Jan 3, 2010 06:15 PM
88f150302
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
2
Mar 20, 2009 09:27 PM
Kingtim7
1999 - 2003 7.3L Power Stroke Diesel
16
Apr 18, 2007 11:46 AM
Kingtim7
Clutch, Transmission, Differential, Axle & Transfer Case
4
Mar 19, 2007 09:08 AM
locash
1999 - 2003 7.3L Power Stroke Diesel
15
May 12, 2006 09:17 AM




All times are GMT -5. The time now is 06:58 AM.

story-0
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-1
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-2
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-3
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-4
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE
story-5
2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Slideshow: first look at the 810 hp 2026 Shelby F-150 Off-Road!

By Brett Foote | 2026-05-12 12:50:07


VIEW MORE
story-6
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Slideshow: Everything You Need to Know about the 2027 Super Duty Carhartt Package!

By Michael S. Palmer | 2026-05-07 17:51:06


VIEW MORE
story-7
10 Most Surprising 2026 Ford Truck Features!

Slideshow: 10 most surprising Ford truck options/features in 2026.

By Joe Kucinski | 2026-05-05 11:17:22


VIEW MORE
story-8
Top 10 Ford Trucks Coming to Mecum Indy 2026

Slideshow: Here are the top 10 Fords coming to Mecum Indy 2026.

By Brett Foote | 2026-05-04 13:49:49


VIEW MORE
story-9
5 Best / 5 Worst Ford Truck Wheels of All Time

Slideshow: The 5 best and 5 worst Ford truck wheels of all time

By Joe Kucinski | 2026-04-29 16:49:01


VIEW MORE