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Mach 1
question about gears in machs
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<blockquote data-quote="Charles236" data-source="post: 3781251" data-attributes="member: 25923"><p><strong>3.90 Gear update</strong></p><p></p><p>The 3.90s have been in for about eight or nine days now. I finally ran the car hard after a one week break-in of the gears. The performance of the Mach1 with this gear set is impressive. The combination I am running is a 3.90 gear set on a Detroit Truetrac 31 spline differential in a cast iron Thunderbird pumpkin in an '03 Cobra IRS. The traction is excellent with this combination, and I haven't experienced wheelhop even when traction was marginal. I believe that the torque splitting capability of the Truetrac and the weight (inertia) of the iron T-bird pumpkin helps to reduce or damp out any perceptible wheel hop. I had a friend ride with me on one run who said that it felt stronger than with the 4.30s, mainly because traction wasn't as much of a problem with the 3.90s as with the 4.30s. I have never had any timed runs with any of the different gears (3.55s, 3.90s, 4.10s, and 4.30s) that have been in this Mach1, so I can't say for a fact that the 3.90 gears will run a quicker time than other gear ratios, but the performance with 3.90s doesn't disapoint me in any way.</p></blockquote><p></p>
[QUOTE="Charles236, post: 3781251, member: 25923"] [b]3.90 Gear update[/b] The 3.90s have been in for about eight or nine days now. I finally ran the car hard after a one week break-in of the gears. The performance of the Mach1 with this gear set is impressive. The combination I am running is a 3.90 gear set on a Detroit Truetrac 31 spline differential in a cast iron Thunderbird pumpkin in an '03 Cobra IRS. The traction is excellent with this combination, and I haven't experienced wheelhop even when traction was marginal. I believe that the torque splitting capability of the Truetrac and the weight (inertia) of the iron T-bird pumpkin helps to reduce or damp out any perceptible wheel hop. I had a friend ride with me on one run who said that it felt stronger than with the 4.30s, mainly because traction wasn't as much of a problem with the 3.90s as with the 4.30s. I have never had any timed runs with any of the different gears (3.55s, 3.90s, 4.10s, and 4.30s) that have been in this Mach1, so I can't say for a fact that the 3.90 gears will run a quicker time than other gear ratios, but the performance with 3.90s doesn't disapoint me in any way. [/QUOTE]
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