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Author
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Topic: Missing high gear.....
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Hans olsson
Gearhead Posts: 733
From: Sweden
Registered: Apr 2000
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posted 12-15-2001 10:15 AM
   
is my brother�� fairmont bracket racer.All the other gears are working. The trans is a C-4. We have tried another valve body. No effect.  .The trans has been rebuilt recently with no apperent damaged or missing parts. This is really strange,in high gear the forward and reverse-high clutches are applied. The forward clutch is applied in all forward gears.In reverse the reverse-high clutch and low-reverse band are applied. Any ideas? Hans Olsson------------------
- 71 Mach1 351c
- E/SA 11.89-110
- F/SA 11.92-110
[This message has been edited by Hans olsson (edited 12-15-2001).]
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 12-15-2001 12:00 PM
Have you put a pressure guage on it yet Hans? Very easy to do. All you nned is one that will read to 300# or more. Can you get me a reading? You may have a weak pump.  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
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Hans olsson
Gearhead Posts: 733
From: Sweden
Registered: Apr 2000
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posted 12-15-2001 03:47 PM
I will get back with a reading asap. .------------------
- 71 Mach1 351c
- E/SA 11.89-110
- F/SA 11.92-110
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 12-17-2001 11:34 AM
So Hans, did you ever locate your "lost" gear?  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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Hans olsson
Gearhead Posts: 733
From: Sweden
Registered: Apr 2000
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posted 12-17-2001 01:06 PM
Not yet, i had the gauge but not the right fittings.When we have all the right parts i will get back with a reading.If the reading is low could high gear be the first to be affected? How should the test be performed do you think? ------------------
- 71 Mach1 351c
- E/SA 11.89-110
- F/SA 11.92-110
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 12-17-2001 01:10 PM
You need to check and note the pressure in low, second, high, neutral and reverse Hans. ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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Mario428
Journeyman Posts: 82
From: Charlottetown, PEI, Canada
Registered: Nov 2001
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posted 12-18-2001 08:42 AM
There is a problem with the low-rwverse band. Low forward gear uses the one-way and does not need the band. You would have to test for engine braking in low gear to see if it is working. If the tranny frewheels slowing down in low gear the band is not working.
Strut fallen out of place, would be very odd for the piston to stop sealing enough to have no reverse at all.
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Hans olsson
Gearhead Posts: 733
From: Sweden
Registered: Apr 2000
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posted 02-02-2002 12:25 PM
This is the pressures Low 99 Sec 99-170 H 71-156 N 71 R 178-227 P 71 All in PSI
Mario428 the only gear that dont work is high,all the others do.
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- 71 Mach1 351c
- E/SA 11.89-110
- F/SA 11.92-110
[This message has been edited by Hans olsson (edited 02-02-2002).]
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kid vishus
Gearhead Posts: 6590
From: middle of NC
Registered: Oct 2000
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posted 02-02-2002 01:36 PM
Hmmm, I have a c4 sitting on the floor of my garage that I removed from my street car because high gear quit working in it too. All other gears worked except high.
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Hans olsson
Gearhead Posts: 733
From: Sweden
Registered: Apr 2000
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posted 02-02-2002 01:43 PM
It is really strange because high gear depends on forward clutch,wich is engaged in all forward gears. .------------------
- 71 Mach1 351c
- E/SA 11.89-110
- F/SA 11.92-110
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kid vishus
Gearhead Posts: 6590
From: middle of NC
Registered: Oct 2000
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posted 02-02-2002 01:53 PM
When mine stopped working it was a slow progression. At first, it wouldnt shift into high until it was warmed up real good, then it would be fine (it wouldnt shift automatically till then either, had to manually shift it). Then it got to the point where it didnt matter how long I drove it, it would never shift into high gear or shift automatically. It would still blaze the tires on the 1-2 shift though, but it would free-wheel in high gear. I got tired of mesing with it and pulled it out, and put m y good ole power robbing c6 back in it.
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Mario428
Journeyman Posts: 82
From: Charlottetown, PEI, Canada
Registered: Nov 2001
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posted 02-03-2002 08:00 AM
Big Opps on my post Hans, did not read your original post well enough.
If you still use the govenor to help the tranny shift it is stuck. Remove the tailshaft housing and remove & clean.
This is my thought now but have already been proven wrong once in this thread LOL
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Hans olsson
Gearhead Posts: 733
From: Sweden
Registered: Apr 2000
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posted 02-05-2002 12:45 PM
Alex what do you think of the pressures? First 99 second 99-170 high 71-156 n 71 r 178-227 p 71 lbs Low reading at idle,high at Wot. . Hans ------------------
- 71 Mach1 351c
- E/SA 11.89-110
- F/SA 11.92-110
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 02-05-2002 01:50 PM
Hans, your pressures are way to low. You need to have at least 175#'s across the board. You have two problems as far as I can tell. One is a sticky valve in the valve body. You need to take it apart and clean it up. Make certain that everything is very free and clean. Secondly, and the source of your pressure problem is the sealing rings on the front pump. Either they (one of them) are broken or worn, or the wrong ones in the wrong groves. This if absolutly the source of your lost high gear Hans. They are all select fit and you have to be very careful when installing them. Trust me as I learned from experiance last year at Norwalk when I did my own inept repair in the field. The front pump sealing rings are many and they are all very close yet different. JPT prefers the teflon ones and again, you must use the correct ones for your particular pump. ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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Hans olsson
Gearhead Posts: 733
From: Sweden
Registered: Apr 2000
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posted 02-05-2002 02:14 PM
Thanks Alex i will look into those areas.------------------
- 71 Mach1 351c
- E/SA 11.89-110
- F/SA 11.92-110
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