Grimace427 5,469 Report post Posted June 9, 2013 This page will be all about gear ratios, RPM's, tire height, and what works for which situation. The calculator I use is here. Stock GT MT-82 ratios: 3.66 2.43 1.69 1.32 1.00 0.65 Stock V6 MT-82 ratios: 4.24 2.54 1.66 1.24 1.00 0.70 Stock GT and V6 Auto ratios: 4.17 2.34 1.52 1.14 0.87 0.69 Common available rear gear ratios: 2.73 3.15 3.31 3.55 3.73 4.10 Stock tire sizes and their overall height: 225/60/17(27.6") 235/50/18(27.3") 245/45/19(27.7") 255/40/19(27.0") Common drag tire sizes: 275/50/15(26") 275/60/15(28") 275/40/17(25.7") 295/45/17(27.5") 285/40/18(27") 1 Quote Share this post Link to post Share on other sites
Grimace427 5,469 Report post Posted June 9, 2013 GT 5.0 average trap speeds between 110-115mph -Manual transmission With 3.31 rear ratio and 27" tires: 6.000-6,250rpm in 4th gear With 3.55 rear ratio and 27" tires: 6,400-6,700rpm in 4th gear With 3.73 rear ratio and 27" tires: 6,700-7,000rpm in 4th gear 3.31 rear ratio and 26" tires: 6,200-6,500rpm in 4th gear 3.73 rear ratio and 28" tires: 6,500-6,800rpm in 4th gear V6 average trap speeds between 100-105mph Manual transmission 2.73 rear ratio and 27" tires: 5,700-5,900rpm in 3rd gear 3.31 rear ratio and 27" tires: 6,900rpm in 3rd gear to 5,300rpm in 4th gear 3.55 rear ratio and 27" tires: 5,500-5,700rpm in 4th gear 3.73 rear ratio and 27" tires: 5,700-6,000rpm in 4th gear 4.10 rear ratio and 27" tires: 6,300-6,600rpm in 4th gear 3.31 rear ratio and 26" tires: 7,000rpm in 3rd to 5,550 in 4th 3.73 rear ratio and 26" tires: 5,950-6,200rpm in 4th gear 4.10 rear ratio and 26" tires: 6,500-6,950rpm in 4th gear 1 Quote Share this post Link to post Share on other sites
Grimace427 5,469 Report post Posted June 9, 2013 GT automatic ratios and trap speeds(110-115mph): 3.15 rear ratio and 27" tires, 6,550-6,850rpm in 3rd gear 3.55 rear ratio and 27" tires: 5,550-5,800rpm in 4th gear 3.73 rear ratio and 27" tires: 5,800-6,100rpm in 4th gear 4.10 rear ratio and 27" tires: 6,400-6,700rpm in 4th gear 3.55 rear ratio and 26" tires: 5,750-6,000rpm in 4th gear 3.73 rear ratio and 26" tires: 6,050-6,300rpm in 4th gear 4.10 rear ratio and 26" tires: 6,650-6,950rpm in 4th gear V6 automatic ratios and trap speeds(100-105mph) 2.73 rear ratio and 27" tires: 5,200-5,400rpm in 3rd gear 3.31 rear ratio and 27" tires: 6,250-6,600rpm in 3rd gear 3.55 rear ratio and 27" tires: 6,700-7,000rpm in 3rd gear 3.73 rear ratio and 27" tires: 5,300-5,550rpm in 4th gear 4.10 rear ratio and 27" tires: 5,800-6,100rpm in 4th gear 3.31 rear ratio and 26" tires: 6,500-6,800rpm in 3rd gear 3.73 rear ratio and 26" tires: 5,500-5,750rpm in 4th gear 4.10 rear ratio and 26" tires: 6,050-6,300rpm in 4th gear Quote Share this post Link to post Share on other sites
2011fastford 3,341 Report post Posted June 9, 2013 Cool info Quote Share this post Link to post Share on other sites
Grimace427 5,469 Report post Posted June 10, 2013 Modified naturally aspirated 5.0 trap speeds 115-122mph, 7,500rpm redline Manual trans 3.31 rear ratio with 26" tires: 6,500-6,900rpm in 4th gear 3.73 rear ratio with 28" tires: 6,800-7,200 rpm in 4th gear 3.90 rear ratio with 28" tires: 7,100-7,500rpm in 4th gear(just barely) Auto trans 3.15 rear ratio with 26" tires: 7,100-7,500rpm in 3rd gear(just barely) 3.15 rear ratio with 28" tires: 6,600-7,000rpm in 3rd gear 3.73 rear ratio with 26" tires: 6,300-6,700rpm in 4th gear 4.10 rear ratio with 26" tires: 6,950-7,400rpm in 4th gear Modified naturally aspirated 3.7 V6 trap speeds 105-112mph, 7,500rpm redline. Manual trans 3.31 rear gear with 26" tires: 7,500 in 3rd-5,900rpm in 4th 3.55 rear gear with 26" tires: 5,900-6,300rpm in 4th 3.73 rear gear with 26" tires: 6,200-6,650rpm in 4th(z28th1s setup) 4.10 rear gear with 26" tires: 6,850-7,200rpm in 4th Auto trans 3.31 rear ratio with 26" tires: 6,800-7,300rpm in 3rd gear 3.55 rear ratio with 28" tires: 6,800-7,250rpm in 3rd gear 4.10 rear ratio with 26" tires: 6,350-6,750rpm in 4th gear 2 Quote Share this post Link to post Share on other sites
2011fastford 3,341 Report post Posted June 10, 2013 Nice work Quote Share this post Link to post Share on other sites
Grimace427 5,469 Report post Posted June 10, 2013 5.0 forced induction, 125-135mph, 7,500rpm redline. Manual trans 3.31 rear ratio with 28" tires: 6,550-7,100rpm in 4th 3.55 rear ratio with 28" tires: 7,050-7,500rpm in 4th Auto trans 3.15 rear ratio with 28" tires: 7,200 in 3rd to 5,800rpm in 4th 3.55 rear ratio with 28" tires: 6,100-6,550rpm in 4th 3.73 rear ratio with 28" tires: 6,400-6,900rpm in 4th 4.10 rear ratio with 28" tires: 7,000-7,500rpm in 4th(just barely) V6 Forced induction, 115-125mph, 7,500rpm redline Manual trans 3.55 rear ratio with 26" tires: 6,550-7,100rpm in 4th 3.73 rear ratio with 26" tires: 6,900-7,500rpm in 4th 4.10 rear ratio with 28" tires: 7,000-7,500rpm in 4th(just barely) Auto trans 3.31 rear ratio with 28" tires: 6,950-7,500rpm in 3rd 3.73 rear ratio with 26" tires: 6,300-6,850rpm in 4th 4.10 rear ratio with 26" tires: 6,950-7,500rpm in 4th(just barely) 1 Quote Share this post Link to post Share on other sites
Grimace427 5,469 Report post Posted June 10, 2013 If you trap more than 135mph in the 1/4 mile you don't need my help. 1 Quote Share this post Link to post Share on other sites
Grimace427 5,469 Report post Posted June 10, 2013 S197-spec Tremec Magnum ratios. http://www.jpcracing.com/tremec-magnum-xl-s197-conversion/ Close: 2.66 1.78 1.30 1.00 0.74 0.50 Wide: 2.97 2.10 1.46 1.00 0.80 0.62 Trap speeds of 115mph: Close ratio with 26" tire and 3,73 rear gear.........7,200rpm in 3rd Close ratio with 26" tire and 4.10 rear gear.........6,100rpm in 4th Close ratio with 28" tire and 3.73 rear gear.........6,700rpm in 3rd Close ratio with 28" tire and 4.10 rear gear.........5,650rpm in 4th Wide ratio with 28" tire and 3.73 rear gear..........7,500rpm in 3rd Wide ratio with 26" tire and 4.10 rear gear..........6,100rpm in 4th Trap speeds of 120mph Close ratio with 26" tire and 3.73 rear gear.........7,500rpm in 3rd Close ratio with 26" tire and 4.10 rear gear.........6,350rpm in 4th Close ratio with 28" tire and 3.73 rear gear.........7,000rpm in 3rd Close ratio with 28" tire and 4.10 rear gear.........5,900rpm in 4th Wide ratio with 26" tire and 3.73 rear gear..........5,800rpm in 4th Wide ratio with 26" tire and 4.10 rear gear..........6,350rpm in 4th Wide ratio with 28" tire and 3.55 rear gear..........7,450rpm in 3rd Wide ratio with 28" tire and 4.10 rear gear..........5,900rpm in 4th 1 Quote Share this post Link to post Share on other sites
ForceofWill 63 Report post Posted June 10, 2013 Stock tire sizes and their overall height: 225/60/17(27.6") 235/50/18(27.3") 245/45/19(27.7") 255/40/19(27.0" Cough Cough*** My rears are 285/35/R19 Quote Share this post Link to post Share on other sites
Grimace427 5,469 Report post Posted June 10, 2013 Stock '10-12 GT500 gear ratios 2.97 1.78 1.30 1.00 0.74 0.50 Stock '13-14 GT500 gear ratios 2.66 1.82 1.30 1.00 0.77 0.50 Stock tire sizes: 285/35/19(26.9") 285/35/20(27.9") to be continued..... Quote Share this post Link to post Share on other sites
Coyote 302 1,291 Report post Posted June 10, 2013 Excellent!!! Quote Share this post Link to post Share on other sites
burke985 270 Report post Posted June 13, 2013 Nice work grim Quote Share this post Link to post Share on other sites
SRT 366 Report post Posted June 15, 2013 For slicks, 3% tire growth for every 100mph. Quote Share this post Link to post Share on other sites
2011fastford 3,341 Report post Posted June 16, 2013 Wow more good info Quote Share this post Link to post Share on other sites
SRT 366 Report post Posted June 20, 2013 Wow more good info X2. It's nice to have a quick reference list. Quote Share this post Link to post Share on other sites
GoT midlife CS 6 Report post Posted June 28, 2013 Tremec Magnum ratios. Close: 2.66 1.78 1.30 1.00 0.8O 0.63 Wide: 2.97 2.10 1.46 1.00 0.74 0.50 Peter, The ratios for a standard T-56 mag wide ratio are correct, but the wide ratio S-197 T-56 mag that is in my car is different 5th and 6th. It has a 80 5th and 0.63 6th. EDIT: For some reason instead of allowing me to type point eighty, it is showing the little guy shooting himself in the head. Hahaha 1 Quote Share this post Link to post Share on other sites
beast3.7 527 Report post Posted June 28, 2013 Does anyone use 3.90s? I would have gone with those if Ford Racing offerd them. I didn't want to go as deep as 4.10s, so the 3.73s seemed like a match for what I was looking for. Quote Share this post Link to post Share on other sites
Grimace427 5,469 Report post Posted June 28, 2013 Peter, The ratios for a standard T-56 mag wide ratio are correct, but the wide ratio S-197 T-56 mag that is in my car is different 5th and 6th. It has a 80 5th and 0.63 6th. EDIT: For some reason instead of allowing me to type point eighty, it is showing the little guy shooting himself in the head. Hahaha Yeah strange I went off Tremec's website for the ratio's and thought they were the S-197 specs but checked the JPC site and you are correct. The ratios have been edited. And yes trying to type 0.80 goes wonky so I use a capital O instead of 0. I'll check with the site operator to see about disabling typed emoticons. Quote Share this post Link to post Share on other sites
Kenaizer 52 Report post Posted June 28, 2013 Haha I was wondering about that.. Quote Share this post Link to post Share on other sites
nastang87xx 1,949 Report post Posted July 2, 2013 O faces! O for gears! Quote Share this post Link to post Share on other sites
Kenaizer 52 Report post Posted August 15, 2013 A guy on the local forum is bringing by a set of 3.31 gears today in exchange for a case of Miller Light. Can't wait to get them on! 2 Quote Share this post Link to post Share on other sites
z28th1s 679 Report post Posted August 15, 2013 A guy on the local forum is bringing by a set of 3.31 gears today in exchange for a case of Miller Light. Can't wait to get them on! I saw that posted!! So you are the 'lucky' person!! Quote Share this post Link to post Share on other sites
SRT 366 Report post Posted August 16, 2013 A guy on the local forum is bringing by a set of 3.31 gears today in exchange for a case of Miller Light. Can't wait to get them on! Man, I haven't seen one of those kind of good deals in a looooong time. Ah, the good ol days. lol I'm getting old :Big Grin: Quote Share this post Link to post Share on other sites
Nyke 277 Report post Posted August 26, 2013 This is some good information. Seems like the 3.31 gears are the sweet spot for forced induction for the v6's. Quote Share this post Link to post Share on other sites