4.10gears/t-loc and speedo.

[Ginzu]

How off will my speedometer be if I just get 4.10 gears w/ t-loc without a custom tuned computer chip? Off by a lot or a little? Just curious b/c I'm def. thinking about getting a 4.10gears and t/loc but I wanna get a chip, but don't know which one. Thanks a lot for your help. BTW I have a 2000 v6mustang with a Transgo shift kit.

[Monkey]

you will be about 20-30% off w/o the chip. you will be off down low mph's by like 10-15mph and up top by upwards of 30mph. get a chip cause 20mph higher than youre actually going will put A LOT of phantom miles on your car

[Ginzu]

whoa...obviously it'll be a good idea to get a chip. thanks