Hey everyone first post here. So I have this 93 mustang lx with a 5.0 and an aod trans in it.
Let me start off by saying that when I had the stock 2.73 rear gears in everything worked good, in fact it was faster. Now I swapped a set of 4:10s in and now I’m having some speedo and shifting issues. According to LMRs Speedo gear calculator I needed a 23 tooth gear, so I got it and put it in and the Speedo was off by 15. It would say 85 and I’d be going 70. Next I got a 21 tooth and now my speedo reads 90 and I’m going 65. Just looking to see if there’s any suggestions on other gears I should try? Maybe a 22 tooth?
Now for my shifting issue, with the 2.73s nothing at all was done to the trans, and when I would shift it manually I would switch gears basically right at redline no problem, now with the 4:10s shifting it manually I can get to redline in 1st gear and as soon as I go to “D” gear it goes to second and at 4k it throws it into 3rd and goes to 3k. And when I would just have it in the circled D it was even worse it would go into 3rd when I’m at 70kmh. So then I went to google and people were saying a shift kit. Done got a tci transcat shift kit. And guess what same exact thing. Read some more about the TV cable played around with it and now shifting manually it goes to 2nd and at 4K it throws it into 3rd, which is better but I would love to be around the 5000-5200 mark. Is there anything else I can check to try and make it shift later? Or am I gonna be stuck with spending some money and getting a new valve body? With all the work I’ve done now with the stock valve body and 2.73 gears the car went way faster then it does now. When I raced my dads 5spd car with the 2:73s it was neck and neck, like my front bumper would be inline with his drivers door the whole 1/4 mile. Now it’s not close at all. Any suggestions are appreciated, Thanks a lot guys!
Let me start off by saying that when I had the stock 2.73 rear gears in everything worked good, in fact it was faster. Now I swapped a set of 4:10s in and now I’m having some speedo and shifting issues. According to LMRs Speedo gear calculator I needed a 23 tooth gear, so I got it and put it in and the Speedo was off by 15. It would say 85 and I’d be going 70. Next I got a 21 tooth and now my speedo reads 90 and I’m going 65. Just looking to see if there’s any suggestions on other gears I should try? Maybe a 22 tooth?
Now for my shifting issue, with the 2.73s nothing at all was done to the trans, and when I would shift it manually I would switch gears basically right at redline no problem, now with the 4:10s shifting it manually I can get to redline in 1st gear and as soon as I go to “D” gear it goes to second and at 4k it throws it into 3rd and goes to 3k. And when I would just have it in the circled D it was even worse it would go into 3rd when I’m at 70kmh. So then I went to google and people were saying a shift kit. Done got a tci transcat shift kit. And guess what same exact thing. Read some more about the TV cable played around with it and now shifting manually it goes to 2nd and at 4K it throws it into 3rd, which is better but I would love to be around the 5000-5200 mark. Is there anything else I can check to try and make it shift later? Or am I gonna be stuck with spending some money and getting a new valve body? With all the work I’ve done now with the stock valve body and 2.73 gears the car went way faster then it does now. When I raced my dads 5spd car with the 2:73s it was neck and neck, like my front bumper would be inline with his drivers door the whole 1/4 mile. Now it’s not close at all. Any suggestions are appreciated, Thanks a lot guys!