Notices
1978 - 1996 Big Bronco  
Sponsored by:
Sponsored by:

bronco shift problems

Thread Tools
 
Search this Thread
 
Old May 22, 2007 | 06:24 PM
  #1  
reecem13's Avatar
reecem13
Thread Starter
|
Senior User
Joined: Jan 2006
Posts: 135
Likes: 0
From: northwest Georgia
bronco shift problems

one of the broncos i have will not shift while driving normally. It will only shift if you let off the gas completely. it downshifts fine but wont upshift until you let off. well, i decided to restore this bronco and took the transmissions out of this one and another that shifted fine. i was just going to swap the trannys until i saw that the one that wont shift was missing a piece. the transmission book i have calls it the band adjustment locknut and bolt. my question is will putting this in fix the problem i'm having? i have pics to help. any help is greatly appreciated.

btw, how do you insert pics?
 

Last edited by reecem13; May 22, 2007 at 06:26 PM.
Reply
Old May 23, 2007 | 11:20 AM
  #2  
Kemicalburns's Avatar
Kemicalburns
Hotshot
20 Year Member
Liked
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
sounds like the vacum modulator is bad
 
Reply
Old May 23, 2007 | 11:37 AM
  #3  
reecem13's Avatar
reecem13
Thread Starter
|
Senior User
Joined: Jan 2006
Posts: 135
Likes: 0
From: northwest Georgia
its a new modulator, i thought that too, so i replaced it but it didn't help. the tranny book i have says you can adjust the modulator. would that help? if the adjustment screw isn't the cause, then what does it do? i know the tranny needs it.
 
Reply
Old May 23, 2007 | 01:19 PM
  #4  
Kemicalburns's Avatar
Kemicalburns
Hotshot
20 Year Member
Liked
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
i couldnt explain that either. have you checked the vacum line that runs down to the tranny
 
Reply
Old May 23, 2007 | 06:02 PM
  #5  
reecem13's Avatar
reecem13
Thread Starter
|
Senior User
Joined: Jan 2006
Posts: 135
Likes: 0
From: northwest Georgia
yeah, it looks fine. so the modulator is the only thing it coud be?
 
Reply
Old May 24, 2007 | 08:12 AM
  #6  
Kemicalburns's Avatar
Kemicalburns
Hotshot
20 Year Member
Liked
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
look in your haynes manual on how to adjust it
 
Reply
Old Nov 17, 2007 | 12:41 AM
  #7  
bigdogger's Avatar
bigdogger
New User
Joined: Apr 2003
Posts: 24
Likes: 0
From: victoria canada
I had a c6 that wouldn't shift up... it was the little vacuum line from the back of the vacuum christmas tree. Attached it and tie-wired it on...Fixed!
 
Reply
Old Nov 17, 2007 | 06:39 AM
  #8  
shift1313's Avatar
shift1313
Elder User
Joined: Apr 2005
Posts: 726
Likes: 3
the band in an auto is like a brake. without the adjuster nut it should go anywhere, atleast i wouldnt think. it applies friction to one of the gear sets.
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

Top 10 Fords at 2026 Carlisle Ford Nationals

 Joe Kucinski
story-1

3 Best / 3 Worst Parts of Modern Ford Ownership

 Brett Foote
story-2

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

 Pouria Savadkouei
story-3

Every 2026 Ford Engine Explained

 Brett Foote
story-4

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-5

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-6

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

 Verdad Gallardo
story-7

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

 Joe Kucinski
story-8

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

 Brett Foote
story-9

Top 10 Ford Truck Tragedies

 Joe Kucinski
Old Nov 17, 2007 | 12:23 PM
  #9  
toolman's Avatar
toolman
Senior User
25 Year Member
Joined: Oct 2000
Posts: 125
Likes: 0
From: Spokane, Wa.
I would put a vacuum gauge on the line at the tranny to be sure you have vacuum, *and* would use a mityvac to apply vacuum to the modulator and see if it holds.

JMHO....

-Scott in Spokane
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Dillon Rogerson
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
2
Feb 8, 2016 03:51 PM
Kyle Stine
1978 - 1996 Big Bronco
2
Jan 31, 2016 11:59 AM
dieselutheran21
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
37
Sep 2, 2014 08:04 PM
Gribbletyler
Bronco II
6
Mar 23, 2012 09:06 PM
lakewood
1999 - 2003 7.3L Power Stroke Diesel
9
Oct 7, 2011 08:18 PM




All times are GMT -5. The time now is 02:37 AM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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-7
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-8
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
story-9
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

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


VIEW MORE