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Unread 06-16-2012   #1 (permalink)
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Default 2004 Mach 1 Mustang Transmission TR3650

I Just recently bought a 2004 Mach 1 and I was having transmission problems a few weeks after I got it (5th Gear would constantly make a grinding noise). Thank god the car was under warranty so the dealership ended up giving me a new transmission. This one works well but i noticed that going 70mph in 5th gear I do about 2250rpm as opposed to my last transmission which did just under 2000rpm. Since I do a lot of highway travel this just got my attention. Is this something to be concerned about or anything?

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Unread 06-16-2012   #2 (permalink)
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no, it sounds about right since Machs have 3.40 rear gears
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Unread 06-16-2012   #3 (permalink)
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Okay thank you. Not sure why the old one ran at lower rpm then, going 70mph
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Unread 06-16-2012   #4 (permalink)
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Quote:
Originally Posted by 2Manystangs View Post
no, it sounds about right since Machs have 3.40 rear gears
Correction... Mach's came stock with 3.55's.

OP, regarding your query, the only explanation is that the new trans has a different 5th gear ratio. However I have absolutely no explanation as to why that might be, unless maybe they used a T45 trans which I'm pretty sure has slightly different gear ratios throughout the gears.... Purely speculation on my part though.
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Unread 06-16-2012   #5 (permalink)
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Quote:
Originally Posted by SoCal2V View Post
Correction... Mach's came stock with 3.55's.

OP, regarding your query, the only explanation is that the new trans has a different 5th gear ratio. However I have absolutely no explanation as to why that might be, unless maybe they used a T45 trans which I'm pretty sure has slightly different gear ratios throughout the gears.... Purely speculation on my part though.
A regular GT tr-3650 may have been installed by dealership. The Mach 1 trans had a .62 overdrive compared to the GT's/cobra .68 overdrive as the Mach came with 3.55 rear axle ratio compared to the different rear axle gear ratios in the others. All other gears in the transmissions are the same, only OD was different to make up for the steeper axle ratio

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Unread 06-17-2012   #6 (permalink)
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Yep....Just like he said.
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Unread 06-18-2012   #7 (permalink)
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Quote:
Originally Posted by 2k3Mach View Post
A regular GT tr-3650 may have been installed by dealership. The Mach 1 <acronym title="transmission">trans</acronym> had a .62 overdrive compared to the GT's/cobra .68 overdrive as the Mach came with 3.55 rear axle ratio compared to the different rear axle gear ratios in the others. All other gears in the transmissions are the same, only OD was different to make up for the steeper axle ratio

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I guess that makes sense but idk why the dealership wouldn't just put the same tranny in it. Would you guys consider this a problem and should i take it up with the dealership again or just not worry about it.
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Unread 06-20-2012   #8 (permalink)
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Quote:
Originally Posted by Machsanity View Post
I guess that makes sense but idk why the dealership wouldn't just put the same <acronym title="transmission">tranny</acronym> in it. Would you guys consider this a problem and should i take it up with the dealership again or just not worry about it.
Aside from the speedo reading one or two mph fast, I wouldn't worry about it. Maybe ask them to reprogram the speedo if it seems to be significantly off.
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Unread 06-20-2012   #9 (permalink)
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Okay thanks for the help. :-)
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