Why do Automatic Gear Shifts Jerk?

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Why do Automatic Gear Shifts Jerk?

Hi Guys,

I'd like to get a discussion going on about why Gear Shifts in Automatic Transmission cars Jerk... So we can bring them to a minimum (or a level of our liking) by checking these points.

I reckon this discussion would not be as applicable to the likes of Prosmatic and Vario cars because they use a different kind of gear shift technology altogether. In conventional automatic gear cars however, this is an issue.

I want to know what reasons contribute to the amount of jerk when gears shift.

Understandably the following contribute to it:

1. The condition of the transmission system itself - how well maintained and little abused it is
2. Transmission Oil level
3. How advanced are the fuel burning settings on the vehicle (more advanced will jerk more)

What I need to know is, what other factors play a part? Do the throttle body and TPS affect the amount of jerk in the shifts?

Anything else? Your contributions would be appreciated.

Gari.pk User 13067 asked on 24 Mar 2011 10:21:51 am

1 Answer

501 views |

Rehan - on 24 Mar 2011 10:22:12 am

Auto jerk like you said due to ATF not being changed regularly
Tranny filter being choked or corrupted (happens in many Hondas and usually the cause of it)
Torque convertor becoming weak overtime.
Clutch packs being worn out
Just like cold, Heat can cause auto trannys to jerk and cause them to break down too hence the use of Tranny Oil Coolers (best thing for an auto tranny)
etc