10.25 RD lower gear ratio... - 460 Ford Forum
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post #1 of 2 (permalink) Old 02-28-2019, 02:51 AM Thread Starter
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Question 10.25 RD lower gear ratio...

here goes, I have an 87 F-250 with a 460, C6 auto trans with a 10.25 rearend 3.55-1. I'm currently using it as a second vehicle and I'd like to get the RPM's down on the highway as inexpensively as possible. I was thinking a new ring & pinion but but i cant seem to find anything lower then what I have. This may be a stupid question but is there another diff size that uses the same size ring & pinion set? thanks.

Last edited by Coleman8r; 02-28-2019 at 02:54 AM.
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post #2 of 2 (permalink) Old 03-04-2019, 06:50 PM
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As far as I know, no. 3.55ís are the highest (or lowest) you can go. You might try to find a used Gear Vendors overdrive.

78 F250, 466/C6/205, EFI, Dana 60 4.88 spool, Ford 10.25 4.88 lincoln locker, Custom 4-link rear coil springs, Custom 3-link front coil springs, 39" Boggers on 12" Weld SS's (sold)
2006 Blue/Gray F250 4x4 CC 6.0 Torqshift NP273
79 F350, 521/T18/205, Dana 60 4.10 detroit, dana 70hd 4.10 Lincoln locker, 36" Rockers on 12" Eagles.dynoed at 628hp and 685ft/lbs torque at 5000rpms all iron
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