1978 f250 plow truck

Asked by Jan 19, 2016 at 09:33 PM

Question type: Maintenance & Repair

Ive got a 1978 f250 with a snow plow on
the front. A few plows ago I started hearing
a rotational knock coming from underneath
only in 4wd moving forward or backwards.
It doesn't do it in 2wd. After hearing this I
had the front outer cv joints replaced but
plowing this afternoon I could still hear the
knocking/clunking. Are there inner cv's that
should also be replaced or should I be
looking for other issues. The truck has the
1ton axial with the lockout hubs.

4 Answers

40

Check U joints, and check rear seal.

40

Check to make sure your going into and out of four wheel drive properly. Make sure you got some weight in the bed across axles not to much but enough so the rear can have some grab. To much and you will find it's hard to steer with your wheels off the ground.

98,345

The last time I heard a rotational clunk from a differential it was a badly chipped tooth on the ring gear, replaced the ring and pinion and all of the bearings and the noise was gone. Note: if it is the ring and pinion it will get worse just before it fails completely due to all of the metal shavings being created at every clunk noise. HTH

1 of 1 people found this helpful.
67,445

Agree with TS,a clunk usually is in the gear,s.

Your Answer

Add photo

Related Questions

  • 1978 f250 plow truck 4 answers

    Ive got a 1978 f250 with a snow plow on the front. A few plows ago I started hearing a rotational knock coming from underneath only in 4wd moving forward or backwards. It doesn't do it in 2wd. Aft...

    Maintenance & Repair

  • F250 , 351w , 1982 Truck Start 3 answers

    I have a 1982 F250. 351windsor, 2 barrel won't start. Have checked or replaced everything through the fuel filter. only starts, only barely, with starting fluid. what's next , new carburetor?

    1982 Ford F-250 XL Standard Cab LB HD

    -

    Maintenance & Repair

  • headlights on 1999 ford f250 superduty truck 5.4 engine 2 answers

    the headlights on my 1999 ford f250 superduty 2wd 5.4 engine truck dont work all lights work fine i have changed the switch and the fuses i know about can anybody tell me what else to try

    1999 Ford F-250 Super Duty XL Extended Cab LB

    -

    Maintenance & Repair

  • what is the best plow truck for a homeowner based on cost to own and repair 3 answers

    Looking for a plow truck for my long driveway and I am trying to figure out which brand is the most dependable?

    Maintenance & Repair

  • Can i change a truck bed on a 1985 ford f250 and replace it with a 1993 ford f250 truck bed? 3 answers

    I have a 1985 ford f250 that I want to remove the bed off of and I want to know if I can replace it with a truck bed off of a 1993 ford f250.

    1985 Ford F-250 STD Standard Cab 4WD LB

    -

    Maintenance & Repair

Shortcuts

Search Maintenance & Repair Questions

Maintenance & Repair Experts

#1 Tom Demyan
Tom Demyan
Reputation 177,190
#2 dandyoun
dandyoun
Reputation 94,360
#3 tennisshoes
tennisshoes
Reputation 77,080
View All

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.