What type of gear was used in a 1990 f250 3/4 ton with a 4.9 engine?

Asked by skidsteer Mar 24, 2010 at 10:34 PM about the 1990 Ford F-250

Question type: Car Customization

I recently bought a 1990 f-250 with a 4.9 liter engine. 300 6 cylinder. It is geared really low. (too low) I am running about 3200 rpm at 65 mph and would at least like to get to 65 at 2200 to 2500. The tag on the rear end does not specify the ratio and I am very curious what type of gear I am running, and what type of gear I can replace it with to still get a fair amount of power to work with.

1 Answer

65

What transmission do you have? If you a direct drive transmission (i.e. non-overdrive automatic or 4 speed manual), it sounds like you have 4.56's. You would be at 3112 rpm's with stock tires. 3.55's or 3.73 will put you the rpm range you want. With 3.55's your rpm's will be at 2423, with 3.73 you will be at 2546 rpm's. Both gears should be alright, but if you do any towing or hauling, the 3.73's would do ya a little better. If you have an overdrive transmission, your down in the 5's. Either way those gears probably not your stock gears.

2 people found this helpful.

Your Answer:

CarGurus Experts

  • #1
    Gene Arnett
    Reputation
    2,070
  • #2
    MikeSt
    Reputation
    1,000
  • #3
    MrRatchet42
    Reputation
    810
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
321 Great Deals out of 14,968 listings starting at $1,712
Used GMC Sierra 1500
148 Great Deals out of 7,258 listings starting at $3,950
Used Ford Mustang
65 Great Deals out of 1,259 listings starting at $4,995

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. Content will be removed if CarGurus becomes aware that it violates our policies.