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Old 02-15-2006, 10:47 PM   #1
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Manual Tranny Problem

I searched this forum, but couldn't find a problem similar to mine, so here goes:

2001 ZX3 5spd - around 20k miles I changed the tranny fluid to TORCO synthetic. Car has driven great, until about 2 months ago. Just at throttle tip-in (I have the FC 65mm TB) the car "bucks " back & forth quite noticeably, in all gears, especially when using cruise control, going downhill - the computer will try to maintain speed right between no throttle and slight throttle tip-in. The car shakes back & forth badly. Car now has 50k on it.

Decided to change the fluid to regular Dexron ATF. As I drained the TORCO, it was dark grey with a silver streak, which of course is fine metal particles. I drives better now, but there is some damage done. When I had the car jacked up, and the tranny in 1st, I was able to move the tire about 45 degrees, which seems excessive.

So 2 questions. What is wrong with my tranny (I would guess differential), and what the hell good is synthetic fluid if this is the result?

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Old 02-16-2006, 10:24 AM   #2
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The bucking may be the TB, check to make sure it isn't sticking slightly or to see if it has a small air leak.
The Ford tranny fluid is pricey, but for once I actually went with Ford on a fluid, it is pricey ($17) but the color and feel are VERY odd so I stayed with their stuff this time.
Speed is only a matter of money; how fast do you want to go?
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