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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1948-1983 Ford F100



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  #1  
Old October 25th, 2013, 07:36 AM
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Default F100 Transmission problem

Hi everyone, new here and a a new owner of a 1981 Ford F100 Flareside.

The problem I have is it is a 3 speed, floor shift manual Transmission, with the 4th speed overdrive. It shifts great into 1st, 2nd, and 4th. It goes into 3rd but takes alot of effort and attempts to do so. Once in it works fine. Just does not want to fully engage easily..Every once in a while it will go right in normally like nothing is wrong.

Shifter problem hopefully. I fear it is a internal problem..Thanks for any ideas you may have..If you need any further info let me know. I am really bummed about this..
  #2  
Old October 25th, 2013, 07:46 AM
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so you saying that 1st gear is not a 'granny gear' ?



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  #3  
Old October 25th, 2013, 08:14 AM
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I was told it was a 3 speed tranny with overdrive. It has 4 gears total and the third gear is the one with the problem. It is probably not a real important factor anyway if it has granny or not. Main thing is why is the one gear hard to get to work? I am sure it is the common manual trans,that was put behind a 81 F100 with a inline 6...Thanks
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Old October 25th, 2013, 01:45 PM
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That sounds like a SROD - do you have to push down on the knob to go into reverse? The TRANS code on the door jamb sticker would be "B". Not a very common tranny, it was only offered for a few years (80-83 or 84) and only behind a 6 or 302.

One balky gear like that is frequently a shot synchro.

Fluid on those is a bit of an oddball too - it takes 80W EP (not GL-x) gear lube.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old October 25th, 2013, 03:36 PM
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Yes you have to push the shift lever down to get to reverse. I was kinda thinking a synchro but it almost just feels like the shift handle will not travel far enough forward to get into third. Barring any other ideas, I may pull the lever off and look for any undue inner wear to the Shifter itself, that may be causing it..

Whats a idea for a good replacement manual trans for the one that is in there if it comes to that? Do not tell me a automatic. That would be a definite downgrade. Even a manual that does not work right, is better than a auto

FORGOT The code is a B on the tag alright..Thanks

Last edited by carbineone; October 25th, 2013 at 03:41 PM.
  #6  
Old October 25th, 2013, 11:10 PM
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Did a little reading - SROD is "single rail overdrive" and it's actually a car transmission. The early Fox body Mustang guys hate it, say it's a pile of crap, and they replace it with a T5. Only question I would have is will a T5 bolt up to a truck 6.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
  #7  
Old October 26th, 2013, 04:11 AM
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Good question. Maybe someone will know. I do know they used the SROD behind the 6 and the 302. My big concern would be how much does a T5 cost? I cannot afford to put alot in the truck..

Someone has surely replaced the SROD Tranny in their F100. Hopefully someone can chime in what tranny is a really good swap..

Also, how would the gearing end up with a T5 in there? I would not end up with a first gear that was hard to take off in and burn up the clutch, or have a 5th gear that would be unusable too? Thanks

Last edited by carbineone; October 26th, 2013 at 10:11 AM.
  #8  
Old October 26th, 2013, 01:09 PM
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SROD:

Ratios:
1st 3.25:1
2nd 1.92:1
3rd 1.00:1
4th 0.78:1
Reverse 3.25:1

T5's had all kinds of versions, look at the table on this page:

http://www.allfordmustangs.com/Detailed/349.shtml

Another option might be a M5OD-R2, but you would have to convert it to a hydraulic clutch.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
  #9  
Old October 26th, 2013, 06:14 PM
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Problem is I have no clue which one to look at in the least. I need a bonified swap option from someone that has replaced a tranny in a Ford Pickup like mine with another. I can read till I am blue if I have no clue what tranny is easiest to swap and what year and model replacement trans I need.

Someone had to put a differant tranny behind their 300 six in a 81 ford...And can tell me what they used.

I really would think there is a option out there using my existing bellhousing and clutch. Even if I had to get a or make a adapter plate..

Chevys are simple. A Chevy tranny from 50 years ago likely would bolt right in a 1981 Chevy, no matter the the size of the motor, but Ford had to make it tough for some reason....Thanks

Last edited by carbineone; October 26th, 2013 at 06:20 PM.
  #10  
Old October 26th, 2013, 06:26 PM
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Go with a New Process 435 4spd. Or if you want a 5spd go with a ZF or M5OD if you want a cruiser.


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