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On my 67 truck there is no tag on the rear end . The truck originaly came out stright gear but now has an automatic on which was put in by the preivious owner. Im trying to find out what gear is in it. The guy i bought the truck from says the rearend hasnt been changed.It has the 390 motor in it.I was told the tag on the drivers door has this information, if this is true can someone tell me which numbers on this tag would be the rear gear ratio ?? also what spline axles were used in these truck rearends ?? Thanks for any help and info.
On my 67 truck there is no tag on the rear end . The truck originaly came out stright gear but now has an automatic on which was put in by the preivious owner. Im trying to find out what gear is in it. The guy i bought the truck from says the rearend hasnt been changed.It has the 390 motor in it.I was told the tag on the drivers door has this information, if this is true can someone tell me which numbers on this tag would be the rear gear ratio ?? also what spline axles were used in these truck rearends ?? Thanks for any help and info.
TLI (Too Little Information). What series truck? F100, F250 or F350? What rear end? Ford 9-inch or Dana rear end?
--if it's an F100 with a 9-inch, good chance it has 3.25 gears with a single track, 28-spline differential/axles but, until we know more, could be most anything, --rear end and gearing-wise.
Warranty tag on the back edge of the drivers door of my '69 F100 Ranger. Notice the two-digit code on the middle line, to the far right, under the "AXLE" heading ("08").
08 is the code for a 3.50 ratio, in a 9-inch rear end, with an open (single track) 28-spline differential/axles.
This method of determining the rear end ratio only works IF: The original warranty tag is still attached to the door, the door is original to the truck and hasn't been replaced due to damage/accident and, if the rear end has never been messed with and the ring&pinion/3rd member haven't been changed out.
If your truck is an F100 with a 9-inch, good probability the ratio code will be "17". But, again, could be most anything.
Ultraranger based on the tag you show,were yours says AXLE - 08 , Mine has the number 17 . Do you know what the gear ratio is for 17 ? My tag has been painted over so i cant tell what it says over each stamped number. Thanks
Ultraranger based on the tag you show,were yours says AXLE - 08 , Mine has the number 17 . Do you know what the gear ratio is for 17 ? My tag has been painted over so i cant tell what it says over each stamped number. Thanks
On '67 F100s, yes. On '68-'72 F100s with the Ford 9-3/8" rear end, no. The Ford 9-3/8" rear end is very similar to the Ford 9-inch rear end but is not the same as the 9-inch.
All Bumpside 9-inch rear ends had 28-spline axles. The optional '68-'72 9-3/8" rear end was available with two versions of the 31-spline axle. If the 9-3/8" rear had an open differential, the 31-spline axles were rated for 3300#. If the 9-3/8" rear end had a Traction-Lok differential, the 31-spline axles were rated for 3600#.
Any Ford 9-inch 3rd member will fit any Ford 9-inch rear end (car or truck). The main determining factor is that the spline count of the differential will have to match the spline count of the axles in the housing that the 3rd member is being installed into. The other thing to be mindful of are the companion flanges on the front of the 3rd member (where the trailing end of the driveshaft attaches to the 3rd member) companion flanges on passenger cars tend to be longer than the companion flanges on pickup trucks. The flanges can also be for 1310 or 1330-series U-joints.
9-inch rear ends in passenger cars tend to have high (numerically low) gear ratios. Trucks tend to have lower (numerically high) gear ratios. Traction-Lok was optional in the 9-inch later in the Bumpside production but, you're more likely to find a 9-inch Traction-Lok differential in the '73-'79 Dentside models. Most Dentside 9-inch rears had 31-spline differentials but there were some 28-spline. All '80-'86 Bullnose 9-inch rears had 31-spline differentials.
I removed the 3.50 geared, 28-spline, single track, 3rd member and 28-spline axles from my stock '69 F100 9-inch rear end and replaced them with a pair of 3300# 31-spline axles from a '71 F100 9-3/8" rear end and installed a Ford 9-inch N-case 3rd member with a 4-pinion, 31-spline, Traction-Lok differential with a 3.50:1 ratio from a '75 F150 4x4.
'68-'72 F100 9-inch rears/axles/brakes are different from the '67-earlier F100 9-inch.
With my truck now being an automatic, and I have 17"wheels (tires are 29" tall) on the rear, this 3:25 gear ratio that came in the truck original with a 3 speed on the column turns around 3800 rpm at 60 mph. What do you guys suggest would be a good road gear with this wheel size and automatic transmission ? I would like to have something that would turn NO more than 23 to 2400 rpm at 65 -70 mph. Any suggestions on what gear I might need to go with ?? Thanks
Yeah, something isn't right ru67. Just off the top of my head, 3.25s, 29 inch tire and no overdrive would be at least 1000 rpm less than you say at 60. Unless it was a typo (actually around 2300 according to the calculator)
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