cab/firewall flex mechanical clutch
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Senior User
Joined: Aug 2002
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cab/firewall flex mechanical clutch
I have 1980 F350 4WD, just reinstalled my rebuilt 400 with new clutch and all... first off my bushings in the equalizer aren't quite right (from a kit I bought) it seems one of them should be cupped to accept the ball on the frame... the kit came with 2 rounded outer bushings that insert into the bar... anyhow it does drag a little, but is very sound (no play)...
anyway, when pushing down on the clutch pedal my whole firewall lifts up and flexes very noticably.... it is a mechanical clutch setup and it seems the pressure on the mount (attached to the firewall) is pushing the firewall and front cab outward and upward... I thought I read somwhere through the forums that bad body mounts can cause this... mine are pretty squishy and cracking...
Any thoughts are welcome... I am trying to square away this truck after investing in the motor and drive train rebuilds and want to make it right...
anyway, when pushing down on the clutch pedal my whole firewall lifts up and flexes very noticably.... it is a mechanical clutch setup and it seems the pressure on the mount (attached to the firewall) is pushing the firewall and front cab outward and upward... I thought I read somwhere through the forums that bad body mounts can cause this... mine are pretty squishy and cracking...
Any thoughts are welcome... I am trying to square away this truck after investing in the motor and drive train rebuilds and want to make it right...
all alone in the world
Joined: Feb 2002
Posts: 2,038
Likes: 1
From: oklahoma
it is the metal the firewalls are made of, way to light. i have seen several that were cracked, even saw one that was broken out around the booster.
i usually fix them with a 1/16 in thick peice of metal on the inside and the outside!
jim
i usually fix them with a 1/16 in thick peice of metal on the inside and the outside!
jim
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
My 82 F100 was like that, it was collapsed cab mounts, the entire corner of the cab would lift when you pushed in the clutch...
This is not even remotely related to the firewall flex the hyd. clutch trucks experience.
This is not even remotely related to the firewall flex the hyd. clutch trucks experience.
Senior User
Joined: Apr 2003
Posts: 237
Likes: 2
From: ipswich USA
Hey Katmandu,
What is the difference between the small kit and big kit? I got a kit from Ford a long time ago, but it was not even close to fitting my truck 85 F250HD with 460. I never returned it because one of the service techs who I knew, just gave it me. The part number I got was E3TZ 7K509 A.
JWR
85 F250HD 4x4 460 T-19 4.10
What is the difference between the small kit and big kit? I got a kit from Ford a long time ago, but it was not even close to fitting my truck 85 F250HD with 460. I never returned it because one of the service techs who I knew, just gave it me. The part number I got was E3TZ 7K509 A.
JWR
85 F250HD 4x4 460 T-19 4.10
More Turbo
Joined: May 2002
Posts: 594
Likes: 5
From: Wetumpka, Alabama
Originally Posted by jwrboss302
Hey Katmandu,
What is the difference between the small kit and big kit? I got a kit from Ford a long time ago, but it was not even close to fitting my truck 85 F250HD with 460. I never returned it because one of the service techs who I knew, just gave it me. The part number I got was E3TZ 7K509 A.
JWR
85 F250HD 4x4 460 T-19 4.10
What is the difference between the small kit and big kit? I got a kit from Ford a long time ago, but it was not even close to fitting my truck 85 F250HD with 460. I never returned it because one of the service techs who I knew, just gave it me. The part number I got was E3TZ 7K509 A.
JWR
85 F250HD 4x4 460 T-19 4.10
the small kit consist of::
template for drilling correct holes.
4 bolts and nuts.
instruction sheet.
re-inforcement bracket.
large kit consist of::
instruction sheet.
large re-inforcment bracket.
hardware kits.
Anyone have pics of the re-inforcement brackets in these kits ??
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Senior User
Joined: Apr 2003
Posts: 237
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From: ipswich USA
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Would be very interested in seeing them. 
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
They mount on the inside of the firewall, and are quite slick. I paid $15 for the small kit, which will work most of the time, unless you really have a bad case. Someone had tried to fix mine with big flat washers, which had helped, but wasn't quite enough. The install isn't too bad, the clutch master has to be taken loose, and then the plate is attached inside with 2bolts which the template shows where to drill the holes for, and then two more are supposed to be drilled, but I didn't feel like fighting to get a drill in the area to be drilled, so I just welded the plate to the firewall in that area. It made all the difference in the world.
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