Member
I have restored the diff to OEM crown and pinion but I now need to reprogram the PCM to match , I have and XCal3 but it doesn't have a option to change to 3.55 ratio. Does anyone know when I can get s stock XCal3 file or if this can be modified with Forscan?
Contributing Member
Unfortunately gear ratio isn't user accessible on xcal3. Somebody with full tuner access will need to build a file for you. First person I would try is Marty. Mo's Speed Shop.
Thanks to Darrin @ BC Automotive:
$1800 and it was worse than when he started!
Brian (FordNut) FPG # 1458 of 7838
03 MM 300A (Lotsa mods, 130k mi) was 303rwhp/318rwtq N/A
then 476/410 D1SC ProCharged on stock block
then 660/555 D1SC PC on 5.3 wet sleeved Teksid alum big bore stroker
then 365/369 N/A on 5.3 wet sleeved Teksid alum big bore stroker
Now 751/617 3.4L Whipple on 5.3 Boss5.0 iron big bore stroker
03 MM 300B Silver (Mostly stock, originally wife's car, 370k mi) FPG # 7053 of 7838 or 49 of 417 SB
03 MM 300B Silver, Stock, wife's next one, 136k mi FPG # 7134 of 7838 or 89 of 417 SB
04 MM Silver, Stock, on standby 85k mi, FPG # 1212 of 3214 or 432 of 997 SB
01 F150 longbed
01 F150 shortbed
00 F150 4x4 stepside
01 F150 4x4 7700
68 Stang FB (70 351C 4V, 4 wheel discs, project car)
Mods listed here (some items not current): FordNut's Mods
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