Question about 1982 Ford F 150

1 Answer

Hi. I have an '82 F-150 with a 351 c.i. engine, the extended cab version with the full-length bed, 4WD, with only 20,000 miles on it. When I'm driving about 70 mph, the tachometer reads 3000 rpm, which seems high to me. My '06 Jeep Commander, for example, runs at only about 2200 rpm at that speed. Is my pickup normal? Thanks, Mike Nelson (using my wife's e-mail, since I don't have any)

Posted by on

  • ChuckAndOdie Jun 04, 2010

    Do you know what transmission is in it? If it is a regular C-6 3 speed, then 3000 at 70mph seems about right, especially if you have tall gears in the differentials. If it is an Auto with Overdrive, then there is a possibility that your converter is not locking up. An easy test for this is when you are at a steady speed, say 50 mph, keep steady pressure on the accelerator with your right foot and with your left foot, very lightly apply the brakes. You should see a slight increase in RPM on the Tachometer, or if you don't have a Tach, listen for a slight RPM increase. No increase in RPM suggests that the Converter is not locking up at higher speeds. A common cause is a stuck open thermostat. If your motor is running cold, then the converter will not lock up.

  • barbie_an13 Jun 04, 2010

    Hi. Thanks for responding so fast! I recently inherited this truck from my dad, so I don't know much about it yet. BUT it's an automatic PRND21 type, with an extra "wheel shift" stick on the hump that gives you these options: 2H,4H,N,4L. I don't know if it also has overdrive. Sorry.
    Thanks!

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 56 Answers

Hi

It does look like you have a 3 speed C6, if the PRND21 description is correct. If you do have overdrive, the "D" will be printed in a white oval.

Sounds like it is OK. My Mustang has a 351C with a C6 trans, and 3000 rpm is about right at 70mph.

The defining factor on the rpm will be the Differential gears, which in a truck, might very well be taller gears instead of highway gears, as the taller gears provide more power output at the axles than the highway gears do.

Example:
if you had 3.0 to 1 gears (Highway), that means that the driveshaft will turn 3 times for every complete revolution of the rear wheels(Axle)

If you had 4.0 to 1 gears, then the driveshaft would turn 4 times for every revolution if the axle. Lots of torque for pulling stumps, but on the highway. the engine will have to turn more rpm's to maintain 70 mph vs a 3 to 1.

with the 3 to 1, you will turn less rpm's on the highway, but will have less available low speed power (Torque) at the wheels.

Sounds like the truck is doing fine.

Posted on Jun 04, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Need transmission, center console, and floor mats for 2001 Sonoma SLS...


is this an extended cab ,4wd,automatic or manual transmission ,,studdering can be anything from needing a tune up --tires balanced -motor mount-suspension- c/v axle --u-joints torque converter-rear -transmission clutch-4wd components etc

Oct 24, 2016 | 2001 GMC Sonoma

1 Answer

Would a 1985 chevy extended cab pick ups cab an bed mount to a 1992 chevy celebritys frame, an how would i do it


Truck has a full frame... celeb is uni-body. not a good match even without doing any measurements.
Technically, you can do just about anything if you are a good welder and have access to a fabrication shop. It takes imagination, skill and some engineering experience....fun idea but I'd leave it alone!

May 20, 2010 | 1985 Chevrolet Chevy

1 Answer

1999 Dodge Ram 2500 changing front-to-rear hydraulic brake line


It will be a lot easier to do with the bed removed. It will also save time. So unfortunately yes that is true.

Jan 29, 2010 | 1999 Dodge Ram

1 Answer

Hi we bought a Nissa Navara 2008 D40 4wd dual cab,


are you sure the correct amount of oil is in it? if over full the engine is trying to drag the crank shaft through the oil

Nov 27, 2009 | 2003 Nissan Se R

1 Answer

CHANGING THE FUEL PUMP ON A 1986.5 NISSAN HARDBODY EXT CAB 4X4


lol good ? look at your tank staps compared too the bed bolts might be cheaper getting new bolts rather then fuel straps, the pumps from a 2 or 4 wheel might not make a difference *** lond as same engine.

May 10, 2009 | 1986 Nissan Pickup 4WD 1986

1 Answer

Won't start unless I wiggle shift lever on the column


There is a neutral safety switch on the transmission. You may need to change this.

Mar 09, 2009 | 2001 GMC Sierra 2500HD

1 Answer

Transmission Identification


If it's a 1500 then yes the 4l60E tranny is for you. If it's a 2500-3500 you'll need a 4l80E. The 80's are only used in trucks with a gvw or 7200 and greater.

Nov 07, 2008 | 1994 GMC Sierra

Not finding what you are looking for?
Cars & Trucks Logo

171 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

75744 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

fordexpert

Level 3 Expert

5495 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...