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Old 05-08-2006, 07:33 PM
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700R4 goes "CLUNK" from first to second

Hey guys,

I noticed it for the first time last night cruising to Walmart for groceries. I've got a 700R4 with a shift kit from B&M in it that I had rebuilt about 6 months ago. Last night after sitting at a stop light, I jumped on it a bit and when the car shifted from first to second...and it is a hard shift, it went "clunk"...almost immediately after it shifted...not "when" it shifted.

Any of you guys have an idea? Think it's the tranny or possibly the U-joints or slip yolk? I am hoping it's not the tranny because my warranty on the rebuild ended 8 days ago.

--edit--

I forgot to add that if I take it easy from a dead stop, it doesn't go "clunk". Also, shifting gears manually doesn't cause it to do that, nor does it do this in any other gear. It only happens from first to second.

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Old 05-08-2006, 07:46 PM
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what car?

tranny mount bad?

torque arm mount bad? if it is a F body car?






Quote:
Originally Posted by Ozz1967
Hey guys,

I noticed it for the first time last night cruising to Walmart for groceries. I've got a 700R4 with a shift kit from B&M in it that I had rebuilt about 6 months ago. Last night after sitting at a stop light, I jumped on it a bit and when the car shifted from first to second...and it is a hard shift, it went "clunk"...almost immediately after it shifted...not "when" it shifted.

Any of you guys have an idea? Think it's the tranny or possibly the U-joints or slip yolk? I am hoping it's not the tranny because my warranty on the rebuild ended 8 days ago.

--edit--

I forgot to add that if I take it easy from a dead stop, it doesn't go "clunk". Also, shifting gears manually doesn't cause it to do that, nor does it do this in any other gear. It only happens from first to second.
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Old 05-08-2006, 08:04 PM
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Sorry about that.

It's out of an '84 Trans am. I had the transmission rebuilt with a B&M transkit last July. I took a look when I got home from work tonight and found the following...

The Transmission Mount looks solid. No evidence of cracks or wear. No missing bolts. Not sure what you mean by "Torque Arm" but the panhard bar is solid on both ends, both bushings are in decent shape. Looking further I found no "visible" signs of any problems...which to me means it's internal. ICK! Does anyone else have any ideas?

Last edited by Ozz1967; 05-09-2006 at 01:48 AM.
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Old 05-09-2006, 11:56 AM
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Quote:
Originally Posted by Ozz1967
Sorry about that.

It's out of an '84 Trans am. I had the transmission rebuilt with a B&M transkit last July. I took a look when I got home from work tonight and found the following...

The Transmission Mount looks solid. No evidence of cracks or wear. No missing bolts. Not sure what you mean by "Torque Arm" but the panhard bar is solid on both ends, both bushings are in decent shape. Looking further I found no "visible" signs of any problems...which to me means it's internal. ICK! Does anyone else have any ideas?

The torque arm is the the thingy the mounts to the trans to the rear. Runs along side with the driveshaft
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Old 05-09-2006, 12:51 PM
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Ok, I checked that, nothing looks out of place, all the bushings "look" ok, but I can't see on the tops of them.
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Old 05-09-2006, 12:53 PM
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I think what you are calling the torque arm is the Panhard bar? Helps to locate the rear end of the car also if I"m not mistaken.
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Old 05-09-2006, 03:02 PM
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Quote:
Originally Posted by Ozz1967
I think what you are calling the torque arm is the Panhard bar? Helps to locate the rear end of the car also if I"m not mistaken.

The panhard bar is the bar that is mounted in the rear that goes from your frame to the rear helps to stabilizes the car in side to side motions. If you go to the back of your car and look at the rear you will see the panhard bar on an angle.

On an f-body there is no upper control arms so what it needs is a torque arm to stop the pinion angle from moving and a panhard bar to stop it from moving side to side. If the torque arm has any play in is you can get a bad wheel hop. Wheel hop is when the rear axle is actually twisting before the tire breaks loose. Then when the tire breaks loose the pinion angle jumps around. Sounds very violent on the car.
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Old 05-09-2006, 03:15 PM
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http://www.bmrfabrication.com/F3-suspension.htm This site will show you your suspention.
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Old 05-09-2006, 05:24 PM
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Ok, then what I was looking at IS the torque arm. Thanks for clarifying that for me. Again, I didn't see any issues with it. I'll try and go under it again tonight to see if I can see something. Maybe I did lose a bushing or something came lose. I'm not sure. All I know, as that it only does it "Right after I shift", and not during the shift. Could it possibly be the transmission doing it on the re-engage after changing gears? It just feels like it's happening right under the shifter, or maybe a little forward of the shifter.
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Old 05-09-2006, 08:03 PM
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Hmm...what about a U-joint? I've never been around one that's going bad so I don't know their characteristics.
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Old 05-10-2006, 07:53 PM
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I have it! The very top part of the transmission mount broke...where the stud goes down into the rubber. I couldn't see it on jack stands because it was the very top of the bushing and all the weight was right there on it. I had it in the shop on base up on a rack and was pushing/pulling on different things to see if anything was loose. Poof! There it was. I replaced the mount and it works like a champ now!
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Old 05-11-2006, 01:27 PM
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glad to hear you got it
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