Tach Sensor/ Transmission Shifting

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Dec 25, 2010 | 05:09 PM

fhafer

Thread Starter

Mountain Pass

Joined: Dec 2010

Posts: 148

Likes: 0

From: Holland, VA

Tach Sensor/ Transmission Shifting

My tach was not registering engine rpm at idle....but would work properly when I got on the throttle. With the help of you guys I narrowed the problem down to the tach sensor. The truck shifted nicely during the sensor's irratic behavior.

Thursday I purchased and installed a new tach sensor which restored the tach to proper operation......but now my truck shifts like I'm getting rear-ended by a HumVee when the truck shifts from first to second gear. The third to fourth gear shift isn't too bad. If I'm HARD on the throttle it shifts like before the tach sensor swap. Light on the throttle slams the transmission hard.

Any thoughts?

Dec 25, 2010 | 06:04 PM

rupejosh

Cargo Master

Joined: Feb 2008

Posts: 3,409

Likes: 1

From: back in SE Iowa

have you checked to see if your fipl is in spec?

Dec 25, 2010 | 06:31 PM

fhafer

Thread Starter

Mountain Pass

Joined: Dec 2010

Posts: 148

Likes: 0

From: Holland, VA

Not Yet......

"have you checked to see if your fipl is in spec"

Not yet....but I will tomorrow. Thank your for the recommendation.

Dec 26, 2010 | 04:02 PM

Tech89

Freshman User

Joined: Dec 2010

Posts: 40

Likes: 0

From: Up North.

Mine Shifts really hard too and I've been looking at replacing/adjusting my FIPL after I heal up from surgery. Let us know what you come up with.

-Pat