North American Turbocoupe Organization



Transmission Questions
Walsted Offline
Posting Freak
#1
I was changing the oil on both cars today and checked a few things while under there. I wanted to see which transmissions were in each car, since the Cougar speedo is off, and the TC has a 7 tooth driven gear. It turns out that the transmissions in both cars have a 1352-114 transmission label. This surprised me, since paint markings on the tranny pan on the TC said "87 Must." and I had guesstimated the difference between RPMs in 4th and 5th at the same speed to be around 83%.

The Cougar has a 17 tooth speedo gear, but the speedometer reads way off, like there was actually a seven tooth drive gear instead of a six tooth in there. (I didn't check the color of the drive gear; it was real hard to see with the cat in the way.) I figured it should have a sixteen tooth driven with a six tooth drive gear, but the error is a lot greater and in the other direction than the difference between a sixteen and seventeen tooth gear.

Is it common for the 85/86 TC/XR7 T-5's to have the seven tooth drive gear? Or is the gear swap common during repairs?

Thanks,

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Mike Walsted - NATO member
1986 5-speed TurboCoupe and 1985 5-speed XR7
Mike Walsted - Sold my 1986 5-speed TurboCoupe
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85turbotbird Offline
Member
#2
Damn Those Gauges!!!!!!!!! [Image: biggrin.gif]
Tadd
85 turbo coupe
beats an f-150
gets roasted by a supra
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Walsted Offline
Posting Freak
#3
Now I am really confused.

I verified the speed of both cars against those roadside radar speed displays, and it shows that the speedometer is correct while using a nineteen tooth driven gear in one car and a twenty tooth driven gear in the other, which works out for a seven tooth drive gear in both cases. I also compared the speedometer to the tachometer in both cars, and again, it all works out for a seven tooth drive gear in both cars. Out of curiosity, I looked at the drive gear in the TC, and it is black, which is the right color for a six tooth drive gear according to this web site and a few others.

Does anyone else (or did anyone else) have a problem with the speedometer agreeing with the tachometer and roadside radar?

Thanks

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Mike Walsted - NATO member
1986 5-speed TurboCoupe and 1985 5-speed XR7
Mike Walsted - Sold my 1986 5-speed TurboCoupe
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