OVERDRIVE

1983 Ford F-100

Tiny

jongustafson22

June, 4, 2010 AT 10:01 PM

Transmission problem
1983 Ford F-100 6 cyl Two Wheel Drive Automatic 107000 miles

Should my truck get better that 13 miles to the gallon? It has the small 6 cyl. and I wonder if the overdrive is not working properly?


http://www.2carpros.com/forum/automotive_pictures/535149_100_0858_4.jpg

6 Answers

Tiny

merlin2021

June, 5, 2010 AT 1:07 PM

Look on the drivers door post, find the label, in the box marked TR, does the letter T appear? If not it's not an AOD tranny.

Tiny

jongustafson22

June, 8, 2010 AT 5:45 PM

Yes there is a 'T'.
It shifts at 45, I am assuming that is the final gear. It is clunky sometimes but shifts. I wonder if the mpg is normal at 13? I lowered the tail gate and it got 13.5 mpg.

Tiny

merlin2021

June, 12, 2010 AT 8:59 AM

Only thing to check is tune up specs, and possible band adjustment, it's a fairly cheap adjustment, any tranny shop can do. I don't know if 13.5 MPG is normal, I dont think older trucks did much better than that. Clunks can also be caused by worn u joints, and tailshaft bushings, and pinion bearings at the rear end.

Tiny

FORDSIXGUY

May, 15, 2012 AT 9:08 PM

It is your rear end I have same truck with 3 on the tree 3.8 six and I get 27 in town 32 on hwy me gears are 2: 73 look at door sticker and look up code

Tiny

FORDSIXGUY

May, 15, 2012 AT 9:09 PM

It is your rear end I have same truck with 3 on the tree 3.8 six and I get 27 in town 32 on hwy my gears are 2: 73 look at door sticker and look up code

Tiny

rivermikerat

July, 20, 2012 AT 4:08 PM

Was this issue ever resolved. Jongustafson, did you check the tuneup as directed by our expert? If not, you should. Fordsixguy also presents a good answer. If the gearing in the differential is too low, you'll have to wind the engine higher than it should need to and you'll get worse mileage.

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