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which gear ratio do i have?

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  #1  
Old 09-20-2012, 10:05 PM
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which gear ratio do i have?
im planning to do a SAS (dana 44) on my f150

im not sure what gearing it has, where could i find this out?

1989 F-150 custom 4x4 5 speed 300 i6.
 
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  #2  
Old 09-20-2012, 10:16 PM
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Look at the door jamb sticker. Here is a decoder to figure out a lot of info contained on said sticker: Vin Decoder - FSB Forums
 
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Old 09-20-2012, 11:00 PM
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Super Helpful link Ive had this f150 since april and still didnt know the gear ratio
Thanks
 
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Old 09-21-2012, 08:16 AM
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Anytime!
 
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Old 09-21-2012, 08:22 PM
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got the codes and they dont match the decoder. it says "M9" in the box for axle. what does this mean?

 
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Old 09-21-2012, 08:28 PM
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Are you sure that's not an "H" as in H9?

Bad angle on the picture but looks like a H to me.
 
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Old 09-21-2012, 08:37 PM
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The picture is a bit tough to see. Is the ''m'' really an ''h''. If so H9 usually means a 3.55 ratio with limited slip in this year truck.
 
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Old 09-21-2012, 08:40 PM
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i believe its an H. my bad. thank you!
 
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Old 09-21-2012, 08:40 PM
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I agree on the 'H'. The 'H' means that it's limited slip (if the first of the two digits is a letter, it's limited slip), and if I recall, the '9' means that it's a 3.55 ratio.

Jason
 
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Old 09-23-2012, 01:17 PM
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Why would they put 2.73's on my truck wouldnt 3.55s be better power/mileage balance?
 
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Old 09-23-2012, 02:44 PM
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Originally Posted by 96f15013ddie
Why would they put 2.73's on my truck wouldnt 3.55s be better power/mileage balance?
For pure highway driving(unloaded) you have the optimal gears
 
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Old 09-23-2012, 02:48 PM
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Originally Posted by Diesel_Brad
For pure highway driving(unloaded) you have the optimal gears
Only in areas that are flat in all directions however.
 
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