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Old 08-08-2003, 05:17 PM
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93 firebird 4l60

Hi I'm new here but you guys seem to be pretty knowledgable about transmissions. I have a 93 firebird formula 350 with an automatic transmission which I believe to be a 4l60 which is the same thing as a 700r4. The tranny that's in it shutters when it's in overdrive and it seams like it's pretty much junk to me. From what i hear 700r4 tranny's aren't the greatest. I was thinking of putting a th350 in it and i realize i'll loose overdrive but I'd rather not have overdrive and have a good transmission than be rebuilding the 700r4 all the time. Anyway I was wondering if any of you guys know much about a 4th generation f-body and if you can give me some suggestions on swapping the 700r4 for a th350 in it. All the other threads I have read have been the other way around and for trucks not an f-body.

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Old 08-08-2003, 05:47 PM
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Well I know there are some good Gm guys here familiar with your set-up that can help. Off the topic a little have you done anything to try and stop the shudder yet? This is a fairly common problem with the late model Grand Marquis/Crown Vic transmissions. Before condemming the trans we usually completely drain the trans fluid and change the filter, then we add a can of additive we sell called Shudder Guard by Wynn's (other brands available I'm sure) and it helps a lot of the times. These Fords are nice 'cause they have a drain plug in the torque converter so you're getting all the fluid out. On the vehicles that do not have a drain for the torque converter we use a power flush machine that flushes out all the old fluid and when it's done we add the Shudder Guard. You'd be amazed at how well it works sometimes. I consider it worth a shot if it buys you some time unless the trans is in real bad shape.


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Old 08-08-2003, 05:57 PM
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I did try to fix the problem by droppin the pan and changing the fluid and filter but i didn't get all the fluid out of the torque converter. Just changing the fluid and filter helped it out for about 3000 miles but the dreaded shutter is back.
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Old 08-08-2003, 07:44 PM
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there are a few things that cause the shutter in a converter lock up. I believe this is what you are feeling. Mayb not.

A lock up solenoid could be leaking, a pressure switch, an accumilator might cause this pressure loss.

It is also possible the 3/4 clutch pack is not holding power and is chattering.

Clutch packs will chatter, the bands will slip and not produce a chatter / shutter feeling.

to install a T-350 you need a 9 inch tail housing tranny and the adapter kit program for the torque arm that runs up from the trear diff which mounts to the 700 tranny.
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Old 08-08-2003, 08:13 PM
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4l60e shutter

90 to94 4l60(700r4) 4l60e would wear stator shaft on the inside at the last sealing ring on input drum causing it to lose oil in 3-4 clutch circuit and cause tcc chatter. can be bad converter clutch also can be engine mis fire, have you had engine scan for any trouble codes or at least check see what data stream is showing.
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