SPArKy_Dave 8,831 Posted March 6, 2020 This list may be helpful for some, to achieve an accurate Speedometer, vs chosen diff ratio and wheel/tyre size. Diff ---- Trans -- Rim -- Drive Gear --- Teeth -- Color --- Driven Gear -- Teeth -- Color 3.23 -- 4 Auto --- All -- XA-17285-C --- 8LH -- Yellow -- XE-17271-D -- 21 LH -- Light Green 3.23 -- Manual -- All -- XAP-17285-A -- 8LH -- Yellow -- XE-17271-D -- 21 LH -- Light Green 3.08 -- 4 Auto --- All -- XA-17285-C --- 8LH -- Yellow -- XE-17271-C -- 20 LH -- Brown 3.27 -- Manual -- All -- XAP-17285-A -- 8LH -- Yellow -- XE-17271-D -- 21 LH -- Light Green 3.27 -- 4 Auto --- All -- XA-17285-C --- 8LH -- Yellow -- XE-17271-D -- 21 LH -- Light Green 3.45 -- Manual -- 15" - XAP-17285-A -- 8LH -- Yellow -- XE-17271-E -- 22 LH -- Grey 3.45 -- 4 Auto --- 15" - XA-17285-C --- 8LH -- Yellow -- XE-17271-E -- 22 LH -- Grey 3.45 -- Manual -- 16" - XAP-17285-A -- 8LH -- Yellow -- XE-17271-F -- 23 LH -- Black 3.45 -- 4 Auto --- 16" - XA-17285-C --- 8LH -- Yellow -- XE-17271-F -- 23 LH -- Black 2.77 - Auto/Man - All ------------------------ 8LH - Yellow ----- XE-17271A - 19LH --- Purple 2.92 - Auto/Man - All ------------------------ 8LH - Yellow ----- XE-17271B - 19LH --- Pink http://www.fordmods.com/documents.php?d=30 Purple 19 XE17271A Pink 19 XE17271B Brown 20 XE17271C Light Green 21 XE17271D Grey 22 XE17271E Black 23 XE17271F 1 Slow250XC reacted to this Share this post Link to post Share on other sites
deankxf 20,233 Posted March 6, 2020 thats only for borgwarner autos not FMX/C4 etc the gears run the opposite on these so the gears teeth are cut the opposite angle 4 bear351c, Thom, SPArKy_Dave and 1 other reacted to this Share this post Link to post Share on other sites
4vxb 7 Posted April 15, 2021 Do you happen to have a list of the fmx speedo gears? Share this post Link to post Share on other sites
bear351c 10,260 Posted April 15, 2021 GT shops, Rare Spare, etc have the FMX driven gears for your diff ratio, but, I got the "right" coloured one for my 3.5 gears, but speedo was still out by 20 kays, so had the speedo recalibrated. All good. Part # SDG2 and SG17, 18, 19 at GT Ford Performance. Share this post Link to post Share on other sites
CHESTNUTXE 7,261 Posted April 16, 2021 i played the game with fmx /c6 speedo drives with my 400/c6 combo and it drives ya mad at $50 a pop thinking you got it right ,i still have a few in the garage i ended up getting the lowest tooth count 15 i think and it got me within 6km of correct with 15'' wheels and 225/60/15 ,if i went a 70 or 75 series tyre like the big yank tanks had it would have been near perfect. Share this post Link to post Share on other sites
4vxb 7 Posted April 16, 2021 From memory mine was out, but it 8+ years ago since ive run the fmx in the car so cant really remember. It was damn near perfect with whatever drive was in the single rail with 235/65r14 tyres Share this post Link to post Share on other sites
bear351c 10,260 Posted April 17, 2021 You can get one to fit out of a JEEP, but the pitch is slightly different, and it'll need changing every 6 months. Cant remember where I read that... 1 gerg reacted to this Share this post Link to post Share on other sites
SPArKy_Dave 8,831 Posted April 17, 2021 13 hours ago, bear351c said: You can get one to fit out of a JEEP, but the pitch is slightly different, and it'll need changing every 6 months. Cant remember where I read that... Here's some more JEEP info for you - the 80's/90's glovebox locks, are the same as XD-XH, except colour-coded to the Jeep interiors. 1 bear351c reacted to this Share this post Link to post Share on other sites