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Old March 25th, 2012, 08:25 AM   #1
pitbull2332
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Default Anyway to tell gear ratios in 1978 ford f 250

I am looking at a 1978 f 250 ford pickup, It has a 351m 4 speed 205 combo. My question is is there a easy way to tell what gears this truck would have? There are all the trim tags on the truck. I know who bought the truck new and it is unmolested . He doesnt know what gears it has. Also what type of 4 speed eould this have? sm 465?
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Old March 25th, 2012, 08:31 AM   #2
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It won't be an SM465...that's a GM trans. Probably an NP435.

The HP44 front and 30 spline LP60 rear should have ratio tags on them, a little wire brush work and they might be legible, or you can pull a cover and be sure, it's just a little gearlube and RTV. If I had to guess, I'd go with 4.11:1 or 3.54:1
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Old March 25th, 2012, 04:16 PM   #3
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Could just jack it up and count the rotations of the wheels and driveshaft.
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Old March 26th, 2012, 03:34 AM   #4
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Could just jack it up and count the rotations of the wheels and driveshaft.
If you can get both tires to rotate at the same speed (bring a friend) and can see the driveshaft real well (bring another friend)
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Old March 26th, 2012, 07:16 AM   #5
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Look at this link, it decodes the entire vin tag for you. http://fordification.net/tech/vin.htm
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Old March 26th, 2012, 07:26 AM   #6
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I've cut up and or owned probably 30 78-79 ford trucks from broncos to F-350s.

Every automatic truck had 3.54 gears

Every manual truck had 4.10 gears.


I'm not sure if it was always that way, but I'm starting to think so. I've never seen anything different, although all the trucks I've had have been 351/400M or 429/460. I've never had a small block or six popper truck.
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Old March 26th, 2012, 11:09 AM   #7
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Originally Posted by Route55 View Post
I've cut up and or owned probably 30 78-79 ford trucks from broncos to F-350s.

Every automatic truck had 3.54 gears

Every manual truck had 4.10 gears.


I'm not sure if it was always that way, but I'm starting to think so. I've never seen anything different, although all the trucks I've had have been 351/400M or 429/460. I've never had a small block or six popper truck.
The 390/auto/divorced 203 '77 F-250 I cut up had 4.10's...both of my '77 F-150 front axles had 3.54's...
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Old March 26th, 2012, 12:46 PM   #8
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The 390/auto/divorced 203 '77 F-250 I cut up had 4.10's...both of my '77 F-150 front axles had 3.54's...
I've only owned two 73-77 trucks. Both were parts trucks, but originally FE motor manual trans f-250 models. Both had 4.10. I've read that 73-77 trucks used a wider array of gear ratios, but for 78-79 I've only seen the two. I'm not saying thats all they used, but the "norm" those two years seems to be manual - 4.10 Automatic - 3.54.
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Old March 26th, 2012, 07:23 PM   #9
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read the tag on door, it says axle and gives a code look in repair manual. most of those 3/4 trucks came with 4:10 but i have had some with 3:54.
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Old March 28th, 2012, 05:00 AM   #10
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Quote:
Originally Posted by Route55 View Post
I've only owned two 73-77 trucks. Both were parts trucks, but originally FE motor manual trans f-250 models. Both had 4.10. I've read that 73-77 trucks used a wider array of gear ratios, but for 78-79 I've only seen the two. I'm not saying thats all they used, but the "norm" those two years seems to be manual - 4.10 Automatic - 3.54.
I wasn't doubting you, just adding to the curiosity...even the Early Bronco I robbed parts off of had 3.54's....weird.

The 30-some '70-'89 Chevy's I've parted out have ranged from 2.73, 3.08, 3.54, 3.73, 4.11, and even 4.56 with no real decernable pattern....for once the Ford guys have it "easy".
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Old March 28th, 2012, 07:57 AM   #11
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Originally Posted by 4Bangler View Post
I wasn't doubting you, just adding to the curiosity...even the Early Bronco I robbed parts off of had 3.54's....weird.

The 30-some '70-'89 Chevy's I've parted out have ranged from 2.73, 3.08, 3.54, 3.73, 4.11, and even 4.56 with no real decernable pattern....for once the Ford guys have it "easy".
I know you wern't. I was just clarifying that the majority of my full size ford experience has been with 78-79 models.

To add to this growing list, Here is my other ford gear ratio experiences:

1988 and 1989 and F-350 460 Auto trucks - 3.55

1993 F-350 460 Manual - 3.55
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Old March 28th, 2012, 01:18 PM   #12
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Quote:
Originally Posted by Route55 View Post
I've cut up and or owned probably 30 78-79 ford trucks from broncos to F-350s.

Every automatic truck had 3.54 gears

Every manual truck had 4.10 gears.


I'm not sure if it was always that way, but I'm starting to think so. I've never seen anything different, although all the trucks I've had have been 351/400M or 429/460. I've never had a small block or six popper truck.
The truck I bought has 4.10 gears. It also has a dana 60 in the front. I am not sure if this is factory orig. The truck is a 1978 f 250 351 m and a 4 speed manual / 205 combo
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Old March 28th, 2012, 08:58 PM   #13
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Originally Posted by pitbull2332 View Post
The truck I bought has 4.10 gears. It also has a dana 60 in the front. I am not sure if this is factory orig. The truck is a 1978 f 250 351 m and a 4 speed manual / 205 combo
Yes, Dana 60's came in front of all 78-79 fords with 8,000 gvwr or higher and/or snow fighter package. Known to exist, but I've never seen one, is a snow fighter truck with under 8,000 gvwr still equipped with a dana 60. What gvwr is your truck?
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