Any Transmission Guys here?

[gl55]

If you want rear end gears changed I know the guy that did them at Gary's Differential for years. When Gary closed his shop he continued doing them out of a shop at his house. He is around S 27th and Shields area in OKC.

 

[Okie4570]

That truck has a 10.25" Sterling rear end. 10.25" and 10.5" rears are super simple to swap gears on if needed. What are your rpm's at 65mph in 5th?

 

[CHenry]

My times have changed. 4:30 gears in my F-250 with 7.3 liter Godzilla engine. The 10 speed transmission runs the same RPM in 10th gear as my cousins F-250 with a 320 something rear end. We get the same highway mileage.
I will say the OP may have one of the old standard shift 4 speeds that did indeed have 1st as a granny gear for getting loads out of the hole and moving.
For every day driving with no load. Only gears 2nd through 4th is used. 1st never used unless needed. Drive it like a three speed and never look back.

He stated its a 5 speed manual. Did the 5 speed have a granny gear?

 

[Dumpstick]

I used to own a mid-70s Dodge short narrow, 318 and a 4spd granny low.
Guy I bought it from, who purchased it new, stated he bought so he could work alone.

Jack up the idle, tie the steering wheel, put it in granny. He could walk alongside the trailer and buck hay by himself.

 

[Honey Badger]

Change the rear end gears.
(copied)
There is 3.08, 3.27, 3.55, 3.73 and 4.10. The 3.08 and 3.27 are more common in 2wd's but can be found in 4x4's while the other ratio's are more common in 4x4's but can be found in 2wd's. Most common is 3.55. Go underneath and look at the tag on the diff. You will find the ratio reading the bottom line from the bolt out. Some times the first number has been crushed by the bolt so you will have to interpret.

So the 1990 Ford F250 came with a 10.25 Sterling axle. What would putting a 3.55 gear set do for me? Does this also involve any transmission work?

 

[swampratt]

Here is some math I keep in my head to find out RPM for given gear ratios.

336 is a given.
336 X gear ratio X MPH divided by Tire diameter = RPM

If you have 4.10 gear and go to 3.55.
336 x 411 x 65 divided by 31=2,895 RPM
336 x 355 x 65 divided by 31 =2,510 RPM

Now for a non lockup automatic transmission you must allow some for torque converter slippage.

If you want to know the rpm in first gear you must multiply first gear ratio by rear end ratio.

If you have an overdrive in high gear take that number and use it.

say .75 OD ratio
.75 X 2,895 rpm =2,171 RPM

 

[Shadowrider]

I used to own a mid-70s Dodge short narrow, 318 and a 4spd granny low.
Guy I bought it from, who purchased it new, stated he bought so he could work alone.

Jack up the idle, tie the steering wheel, put it in granny. He could walk alongside the trailer and buck hay by himself.

Same with my '79 F150 4X4. I bypassed the neutral safety switch so I could start it in first gear without depressing the clutch pedal. Even while off road, going up a hill, with a rick of firewood in the bed. It was super nice when rock crawling and going down steep inclines. At idle, walking was a much faster pace than that truck moved.

 

[trekrok]

Personally, the lemonade ain't worth the squeeze here. I mean, you hope to go from 9MPG to 10MPG on the highway? I'd spend the money on more insulation in the cab and motor on.

Good luck with the restoration.

 

[Honey Badger]

Personally, the lemonade ain't worth the squeeze here. I mean, you hope to go from 9MPG to 10MPG on the highway? I'd spend the money on more insulation in the cab and motor on.

Good luck with the restoration.

I need to find an old 351M and someone who wants to trade it for a 460!!!! Lol

 

[HiredHand]

lol. It’s a truck meant for doing things trucks are meant to do. It’s also big and heavy.

I think for fun around town and on the highway, I’d prefer an F150 with an I6 and a 5spd.