3:73 gear in 96/97 Diffs? - Ford Powerstroke Diesel Forum
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Old 11-01-2013, 07:15 AM
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3:73 gear in 96/97 Diffs?

Hey Guys not sure if I have this posted in the correct forum...Mods please change if need be.
Have a 96 F250 SCSB 2x4 E4OD that I'm intending on swapping to 4x4 and am chewing on different differential ratios. Currently has 4:10 rear (and D60 to go in is 4:10 too). Will 3:73 from SD axles fit?

Thanks,

jrc
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Old 11-01-2013, 07:51 AM
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keep the 4.10s...
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Old 11-01-2013, 08:05 AM
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I have 4:10 in my 95 and they have great low end torque for pulling but once I get out on the highway I rap out at 70 and like 2500 -2700 rpm and to me it's way higher then my liking so I was thinking about 3:73 to drop my Rpms but still keep my torque so it depends on what you plan on doing with the truck
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Old 11-01-2013, 09:51 AM
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2500-2700 RPM

Do you still have factory size tires? I have 4.10's 32" tires and I'm doing below 2400RPM at 70 and getting 18.2 MPGs unloaded and 14.5-15.2MPGs hauling horses. Maybe you need to calibrate your speedo?
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Old 11-01-2013, 10:42 AM
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This F250 SCSB 4X2 will be swapped to 4X4 and D60 (as I have one on hand, with most all the other swap stuff). The intended use is for a DD work commuter (that can do anything) that will tow the periodically. So there is a bias to good mileage and I intend on keeping the E4OD (I think for now). 4:10s are too low for my needs and I don't intend on running bigger then 35" tires it's not a dedicated tow rig, my red sig truck has 3:55s with 35" with the ZF-5 and works very well. Thinking would like to try 3:73 as it might be a good compromise between the two ratios.

jrc
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Old 11-01-2013, 02:44 PM
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you can use SD axles rear is bolt in the front will require an RSK which is a problem in a 2WD truck (so i've heard).

personally i also hate 3.55s and 3.73s then again most all i do is tow. i also get better fuel economy with 4.10s then 3.73s or 3.55s
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Old 11-01-2013, 03:55 PM
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Quote:
Originally Posted by terryknight View Post
you can use SD axles rear is bolt in the front will require an RSK which is a problem in a 2WD truck (so i've heard).

personally i also hate 3.55s and 3.73s then again most all i do is tow. i also get better fuel economy with 4.10s then 3.73s or 3.55s
thanks Terry, the notion is to use the housings I have and do a gear swap and I was wondering if SD gears (in 3:73) from the respective front/rear possibly used might be more readily available then new.

In terms of problematic RSK on a 4X2 frame how so? I'm thinking I might have to box in the frame ends from a F350 to the recipient truck although I have just looked and not measured much save for the overall width seems the same (across front, meaning fender frame mounts measure the same width wise) from truck to truck.

jrc
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Old 11-01-2013, 04:14 PM
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the SD front axle up to early 02 was a D50 so that won't work in a D60. the rear axle is a Sterling 10.5 yours is a sterling 10.25 so they won't work either. after market gear sets run about 200 ish but install at a shop will run more like 700+
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Old 11-01-2013, 04:26 PM
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Actually if you get a dually front axle, they were d60
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Old 11-01-2013, 04:33 PM
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All 350s had 60s, 03-04 they were all 60s
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