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

T/C Lock up mod Question

Thread Tools
 
Search this Thread
 
Old May 31, 2007 | 05:11 PM
  #1  
gunnertom's Avatar
gunnertom
Thread Starter
|
Senior User
Joined: May 2007
Posts: 385
Likes: 0
From: Okeechobee,FL
T/C Lock up mod Question

I did the lockup mod a week a go an have been using it around town,The truck shifts had as hell.the question is were an when do most of you use your lock up.25 mph an up ,or towing, or some other time.Thanks

Tom
 
Reply
Old May 31, 2007 | 05:18 PM
  #2  
cleatus12r's Avatar
cleatus12r
Butt-Head
Joined: Apr 2004
Posts: 9,457
Likes: 2,938
From: Reed Point, MT
The reson your truck is now shifting hard is because there is now no slippage in the torque convertor during shifts. You're feeling the actual shift without the fluid dampener that was the torque convertor.

As for the lockup point, do it whenever you feel the most comfortable and when you're not lugging the engine. I'd definitely make sure you're in at least second gear before you engage the TC because the 1-2 shift uses parts in the transmission that require some delicate handling.
 
Reply
Old May 31, 2007 | 05:27 PM
  #3  
powrstrkn''s Avatar
powrstrkn'
Elder User
Joined: Dec 2005
Posts: 703
Likes: 1
From: Middle of a field CT
I usually engage the TC lock around 25mph and try not to lug the rpm's down, (unless there is a need for smoke!) It seems to be easier on the TC and the rest of the trans.

That being said it keeps the tranny temp slightly ower, and it makes the truck more fun to drive, almost like I can pick a gear like a 6spd.
 
Reply
Old May 31, 2007 | 05:36 PM
  #4  
AustinS's Avatar
AustinS
Laughing Gas
20 Year Member
Joined: Jul 2003
Posts: 1,157
Likes: 1
From: Littleton, Colorado
The main reason I did the TC lockup mod is I tow a lot and it comes in real handy going up & down a grade. Saves the brakes some wear and tear. As cleatus12r said, be careful how you use it in the lower gears.

Austin
 
Reply
Old Jun 1, 2007 | 07:25 PM
  #5  
gunnertom's Avatar
gunnertom
Thread Starter
|
Senior User
Joined: May 2007
Posts: 385
Likes: 0
From: Okeechobee,FL
Any more info on this ? If I lock it down in 2nd an go WOT To the max,Am I buying a new trany. ?

Tom
 
Reply
Old Jun 1, 2007 | 09:55 PM
  #6  
mustang_gt_350's Avatar
mustang_gt_350
Laughing Gas
Joined: Jul 2004
Posts: 783
Likes: 0
that is the golden question. I have been trying to find the answer for a while i think i might do the TC mod this weekend
 
Reply
Old Jun 2, 2007 | 09:50 AM
  #7  
gunnertom's Avatar
gunnertom
Thread Starter
|
Senior User
Joined: May 2007
Posts: 385
Likes: 0
From: Okeechobee,FL
If you get it done be ready for some rock hard teeth ratiling shifts.mine is like side steping the cluch on a 4 speed mustang.

Tom
 
Reply
Old Jun 2, 2007 | 11:08 AM
  #8  
mustang_gt_350's Avatar
mustang_gt_350
Laughing Gas
Joined: Jul 2004
Posts: 783
Likes: 0
lol do you have a shift kit along with the tc mod?
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

 Verdad Gallardo
story-1

Top 10 Fords at 2026 Carlisle Ford Nationals

 Joe Kucinski
story-2

3 Best / 3 Worst Parts of Modern Ford Ownership

 Brett Foote
story-3

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

 Pouria Savadkouei
story-4

Every 2026 Ford Engine Explained

 Brett Foote
story-5

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-6

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-7

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-8

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-9

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote
Old Jun 2, 2007 | 11:45 AM
  #9  
ernesteugene's Avatar
ernesteugene
Postmaster
Joined: Jun 2006
Posts: 2,647
Likes: 0
From: Fulltime RVer
Club FTE Gold Member
Read this thread, it answers your questions. https://www.ford-trucks.com/forums/615365-tc-lock-unleash-the-psd.html
 
Reply
Old Jun 2, 2007 | 01:05 PM
  #10  
gunnertom's Avatar
gunnertom
Thread Starter
|
Senior User
Joined: May 2007
Posts: 385
Likes: 0
From: Okeechobee,FL
Originally Posted by mustang_gt_350
lol do you have a shift kit along with the tc mod?


no just a stock trany,,I think ,bought the truck used an haven't had the pan down yet.

Tom
 
Reply
Old Jun 2, 2007 | 10:18 PM
  #11  
mustang_gt_350's Avatar
mustang_gt_350
Laughing Gas
Joined: Jul 2004
Posts: 783
Likes: 0
I'm looking into getting the sonnax kit. Altho i think mine shifts pretty firm now as compared to the auto in my cherokee.
 
Reply




All times are GMT -5. The time now is 06:55 AM.

story-0
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.

By Verdad Gallardo | 2026-06-12 11:01:55


VIEW MORE
story-1
Top 10 Fords at 2026 Carlisle Ford Nationals

Slideshow: Top 10 Fords at 2026 Ford Nationals

By Joe Kucinski | 2026-06-09 11:10:08


VIEW MORE
story-2
3 Best / 3 Worst Parts of Modern Ford Ownership

Based on years of owning multiple modern Ford products.

By Brett Foote | 2026-06-09 10:53:36


VIEW MORE
story-3
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

SPONSORED: From muddy boots to rain-soaked cargo, these upgrades address some of the most common frustrations Ford truck owners face every day.

By Pouria Savadkouei | 2026-06-08 18:50:34


VIEW MORE
story-4
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-5
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-6
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-7
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-8
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-9
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE