Rear end ratios available
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Rear end ratios available
I recently got an 81 F250 Camper Special that the door code says has a 4.11 differential but it has apparently been swapped out with a 3.0 as close as I can tell. What other ratios are available for the 9 inch differential and what kind of a job is it to change the set? I have dial indicators, micrometers, feeler guages and a pretty complete set of tools and a ton of time. Is this a job I want? I only tow a trailer with this rig so a more appropriate ratio is needed. This thing gets about 10 mpg whether I'm towing or not so gas milage isn't an issue.
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Rear end ratios available
I may stand corrected, but I believe that you probably have a Dana 60 with full floating hubs that the rear wheels slide over before they reach the lug nuts. The 9 inch was a F150 & car rear end, and the whole asembly comes out the front as a unit. No rear 3rd member bolted cover. Bob
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Rear end ratios available
Thanks elliott. My differential has a bolted cover on the back. It doesn't look to me as though anything can come out the input shaft front of the differential case. There are no tags on the case anywhere. I could wrong about the 9 inches. The 8 wheel studs stick out through the brake drums. It appears as though the drums slide off the axel flange with studs in it. I haven't removed a drum so I'm not sure.
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Rear end ratios available
I beleive most any Ford Dana 60 would be a bolt in, and cheaper than a gear change. I would guess that the previous owner changed axle housing to do a cheap gear change. Don't think a Dana 62 would be on a camper special. 3.73 & 4.10 should be an easy find in a salvage yard. Bob
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Rear end ratios available
Sounds like a 10.25 Semi floater or a Dana 60 Semi floater and if it is a Dana axle it will have a 60 casted in the housing near the diff cover.
I would concider a complete axle swap to a Dana 60 or a Ford 10.25 full floater with the gear ratio you want as these semi floating rears were never any good. It would probably be just as cheap and then you wouldn't be worried about blowing an axle shaft.
I would concider a complete axle swap to a Dana 60 or a Ford 10.25 full floater with the gear ratio you want as these semi floating rears were never any good. It would probably be just as cheap and then you wouldn't be worried about blowing an axle shaft.
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Rear end ratios available
[font size="1" color="#FF0000"]LAST EDITED ON 30-Aug-01 AT 11:59 AM (EST)[/font][p]Thanks guys. I just crawled under it and there is a big "63" in the casting in the input shaft support web area. It's about 3/4 inch tall. I guess I'll have to go down the local Ford garage and have them tell me what the heck the rear end is. I generally don't like to go there since everything seems to have $$$$$$ attached. Once I get the type I'll hit the wrecking yards. I'm currently thinking in the 3.5:1 range.
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Rear end ratios available
[font size="1" color="#FF0000"]LAST EDITED ON 30-Aug-01 AT 05:08 PM (EST)[/font][p]Next installment! I scraped the skank off the back of the third member and lo and behold found a tag with the following numbers and letters.
3.00 EITA MB
603946-3 LS
A local ring and pinion guy says this is a Dana 61 semi floater trac-loc.
The bad news is the trac-loc ain't lockin'. I'm not sure how positive the thing is supposed to lock up but the trac-loc is supposed only engage if there is torque on the pinion. How does someone check it out? Jacking up one wheel and putting it in gear only gets growls from the differential but it doesn't seem to want to crawl off the jack like I would expect. Is there a better way to check?
3.00 EITA MB
603946-3 LS
A local ring and pinion guy says this is a Dana 61 semi floater trac-loc.
The bad news is the trac-loc ain't lockin'. I'm not sure how positive the thing is supposed to lock up but the trac-loc is supposed only engage if there is torque on the pinion. How does someone check it out? Jacking up one wheel and putting it in gear only gets growls from the differential but it doesn't seem to want to crawl off the jack like I would expect. Is there a better way to check?
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