Just found thisdd site and registered today. Have a'92 F-150, 5.0 engine, Automatic, with 134,000 miles. I only get 13 mpg around town and think the differentail ratio is to steep. I think the "trailer package" came with a ration somewhere in the 3.75 range. I also think a 3.53 ratio is available. Any have expierence in this field? Sure would like some help in trying to improve my mileage. Rairly tow a light weight trailer very short distances(les than 50 miles)
Thanks for any help or suggeations.
There's a sticker on the driver's side door jamb that will tell you your ratio.
H8=3.55 limited slip
H9=3.08 limited slip
Changing the gears will cost you about $1000 per axle (front too, if it's 4x4). So take that into consideration. Also, even if you swap to 3.08 gears, you can expect maybe 3-4 mpg improvement. I said MAYBE.
Yes, but unless you've done it before, or have someone who knows what they're doing to help you, I wouldn't recommend it. The margin for error is too small - there's no "close enough" or "almost". It's either dead on, or completely wrong.
I had this same inquiry in the Clutch, Trans, Differential,[/u] etc[/u] forum. Was advised to check the metal tag attached to the differential cover. It will give you a lot of information that you can reference. In my case, it was a lifesaver. The door in not orig and would have thrown me off.
i know ive posted here 3 times in a row, but im confused.
the origninal axle in my truck was 19 (3.55). but the guy i bought it off of put in a new rear end, and i dont know what it is, alls i know is that the speedo shows at 5 mph too fast. does that mean theres 3.08s' or 3.73's, or its because my aftermarket C-6. it used to have the mazda 5 speed.
sorry for the added confusion.
88 F150 RC LB 300I6 Comp Cam, Hooker Super Comps 4 spd
03 Silverado 1500 RC SB 5.3l auto 3:73 Outlaw intake, Flowmaster 40's, 93 oct Wait4me tuned PCM 14.9 @ 91 with 87 tune & flows.
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