2 issues

Reply Subscribe

Thread Tools

Search this Thread

Jul 16, 2009 | 01:28 PM

kgkleader

Thread Starter

Junior User

Joined: Jul 2009

Posts: 72

Likes: 0

2 issues

#1 i hear knocking like metal on metal when i decelerate or come to a stop. just clank clank clank. i figured it migh tbe driveshaft so i checked under checked uni joint. shook the hell out of drive shaft to see what was up. and cant find anything. the rear diff leaks a bit. bt i refilled it this weekend and checked it. its not a horrid leak to be low atm. plan on replacing soon. i am aware that the brake assembly on passenger side needs a bit of work, could these be possibilities? im just gonna let it set until i figure out what is going on.

#2 issue. is it jerks when in first. unless i give it a bit of gas ive taken my foot off pedal to see if its trying to die on me. but truck keeps coasting forward but lunges forward every second or so. new to trucks. bought it for DD and a project so any help is really nice.

1978 ford f250 custom btw. 400 ci motor 2wd.

Jul 16, 2009 | 02:18 PM

zak8tac

Senior User

Joined: Nov 2008

Posts: 470

Likes: 0

first gear is a granny gear which means any small increase in rpm due to the natural running of the engine will cause it to lunge. Thats why most people take of in 2nd ;-) these trannys are basically a 3 speed with a granny gear. Regarding your first issue I can't really understand what you are trying to say...

Jul 16, 2009 | 05:56 PM

kgkleader

Thread Starter

Junior User

Joined: Jul 2009

Posts: 72

Likes: 0

Quote:

Originally Posted by zak8tac

oh my bad i start in 2nd. i was refering 2nd as my first gear. um the noise. im just trying to figure out what metal on metal sound coming from underneath could be.

Jul 16, 2009 | 06:02 PM

Furyus1

Postmaster

Joined: Dec 2008

Posts: 3,940

Likes: 8

From: Southern Oregon Coast

Could it be your exhaust hitting something?

Jul 16, 2009 | 06:27 PM

bigdavesohc

Elder User

Joined: Apr 2006

Posts: 600

Likes: 0

From: Cisco, TX pop: 2500

I rebuilt the carb on my truck, and it starts from 2nd very smoothly. Used to jump real bad and hesitate under load.

Jul 16, 2009 | 06:44 PM

kgkleader

Thread Starter

Junior User

Joined: Jul 2009

Posts: 72

Likes: 0

Quote:

Originally Posted by Furyus1

Could it be your exhaust hitting something?

i wish it were. but this isnt a hollow metal bang. sounds like to sledges colliding

Jul 17, 2009 | 08:35 AM

zak8tac

Senior User

Joined: Nov 2008

Posts: 470

Likes: 0

I'm going out on a limb here, but I had a banging sound like you described but it went away when I hit the brakes. The spring that holds the caliper in place was a little worn out so the caliper was able to rock back and forth ever so slightly as to cause the bang... can you tell what area of the truck it is coming from? Can you do anything that makes it stop or get worse? Regarding the other problem, it does sort of sound like a hesitation problem, definitely think about re-building your carb.