Wow! What a difference...
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Junior User
Joined: Sep 2006
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Wow! What a difference...
Today, I finally got around to changing my transmission modulator and accurately filling my trany fluid level. A lot less 'clunk', if any, when shifting from park to reverse and trany up and down shifts are definitely smoother, whether on the flat or climbing uphill. I am really impressed what these two things did for my trany's performance and I strongly recommend doing it. I was lucky; I found an Motorcraft TM-74 modulator for about $20 (inc. shipping) off EBay.
Cheers, Mike
Cheers, Mike
Tuned
Joined: Jan 2008
Posts: 348
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From: Longmont, CO
I always hear a big clunk when shifting out of park if there is forward or reverse pressure on the wheels/transmission but did not think that part was the cause. I can physically feel resistance through the shifter handle and the clunk itself through my feet.....
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Joined: Apr 2000
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From: PNW
That is typical due to a load on the park pawl when you park on an incline. To avoid this when you park on an incline, put the parking brake on after you stop while the transmission is still in gear (you should still have the foot brake on), then put the transmission in neutral and let off the foot brake to make the parking brake takes up the load, and then put the transmission in park. Make sure your parking brake is adjusted properly or you'll roll down the hill when you let off the foot brake. Pay attention. I do it this way for two reasons: first, to take the load of the park pawl so you can shift out of park easily when it's time to leave and second, to make sure my parking brake works in the event that for some reason the transmission pops out of park.
Tuned
Joined: Jan 2008
Posts: 348
Likes: 11
From: Longmont, CO
Unfortunately the parking brake system is shot from front to back and I do not plan on fixing. This is my work beater and the scrap yard would give me more than anybody on earth. If I cannot find level ground to park on or something to park against (curb, pole, etc) I will rock back and forth in my seat and shift when the pressure if off for that split second. Sounds silly but is very effective and only takes a 'rock' or two.....
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I have the same thing with my parking pawl binding (on an incline) up too, but this is not my 'clunk' when I shift from park to reverse first thing in the morning. Mine was and still is some looseness in the drivetrain (not u-joints, bummer). When I adjusted the trany fluid level, it minimized the initial shift from park to reverse, when parked overnight on a level driveway. I've been using the parking brake - trany in neutral until settled and shifted into park routine, when parked on an incline for a while.
Car Guy- If you don't use your parking brake, then accurately check your trany fluid level. If it was too high like mine was, it could be the cause of your 'clunk' when you shift out of park. I don't think the modulator would have anything to do with your problem. Also, could your shifting linkage to your trany be binding or out of adjustment?
Cheers, Mike
Car Guy- If you don't use your parking brake, then accurately check your trany fluid level. If it was too high like mine was, it could be the cause of your 'clunk' when you shift out of park. I don't think the modulator would have anything to do with your problem. Also, could your shifting linkage to your trany be binding or out of adjustment?
Cheers, Mike
Last edited by mikeinganges; Sep 10, 2011 at 12:31 PM. Reason: more info.
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