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Old 01-28-2009, 06:26 PM
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Eliminating the kickdown cable from the T-350 transmission

My streetrod has a mild 350 engine with a TH350 transmission. The downshift cable is not used for safety reasons but it is still attached to the transmission. Can I remove it completely without causing some type of problem? Any tricks for doing so? Thanks.

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Old 01-28-2009, 06:47 PM
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As a Ford guy, I speak with limited knowledge of the TH trannies, although I have rebuilt a few. I don't believe that is a kick down, I think it is for pressure control and running without it or eliminating it can cause damage to the transmission... at least that's my understanding.
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Old 01-28-2009, 07:07 PM
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Yes it is a kickdown,And yes you can run without it. Just keep in mind that the Trans will not kickdown at WOT.The trans will shift just fine.
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Old 01-28-2009, 07:10 PM
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Just cut the end off cable that goes in the trans,seal the cable end and install it back in the trans to seal the hole.
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Old 01-28-2009, 09:32 PM
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Quote:
Originally Posted by Richard Locke
My streetrod has a mild 350 engine with a TH350 transmission. The downshift cable is not used for safety reasons but it is still attached to the transmission. Can I remove it completely without causing some type of problem? Any tricks for doing so? Thanks.
"Safety reasons"?????

I have no idea why you wouldn't want it.

Quote:
Originally Posted by woodz428
As a Ford guy, I speak with limited knowledge of the TH trannies...
Well, you got that part right...

Quote:
I don't believe that is a kick down, I think it is for pressure control and running without it or eliminating it can cause damage to the transmission... at least that's my understanding.
Unfortunately, this part is wrong, It IS a kickdown cable. The later OD transmissions, namely the 700R4 and the 200-4R DO use a throttle valve cable that operates as you describe. The TH350 still used a vacuum modulator to vary line pressure. The cable is purely kickdown.
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Old 01-28-2009, 10:24 PM
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Thanks Joe. It's been 20 years since I built my last TH350 and my last GM tranny was a few years ago..it was a '57 Coupe Deville and that was a pressure control(rod not cable).....so I extrapolated forward. I was going to check when I got back in the shop..after I dusted the manual off
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Old 01-29-2009, 12:00 AM
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Someone makes a TV/Detent cable eliminator aluminum plug for that also but , I can't remember who. Sonnax or TransGo maybe.

Found one. Not the 1st company I was thinking of but same part.>>>>
http://www.bowtieoverdrives.com/cata...php?ITEMID=667

Last edited by SSedan64; 01-31-2009 at 02:28 AM. Reason: Info found
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Old 01-29-2009, 10:14 AM
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I'm using TH350 in my chevelle. I removed mine, and sealed to hole in the tranny. It works fine. You really do not need it if you have big gears on the rear end.

Last edited by lg1969; 01-29-2009 at 02:44 PM.
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Old 01-29-2009, 02:39 PM
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I also run without that cable, 9 years hurts nothing... keep in mind that if you need a passing gear you need to shift down as if you were driving a stick,,

you may want to put in the shift kit at some point, the kick down cable has an S like end and will need to be moved side too side to have it release, the only example I could to point too, to give you the idea of how the cable attaches is this.

think manual choke cable and how it attaches to the carb that should give you the idea of the S like cable end
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Old 01-29-2009, 06:13 PM
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Quote:
Originally Posted by pepi
I also run without that cable, 9 years hurts nothing... keep in mind that if you need a passing gear you need to shift down as if you were driving a stick,,

you may want to put in the shift kit at some point, the kick down cable has an S like end and will need to be moved side too side to have it release, the only example I could to point too, to give you the idea of how the cable attaches is this.

think manual choke cable and how it attaches to the carb that should give you the idea of the S like cable end
a shift kit would not be necassary to eliminate the kickdown rod... just pull the pan and remove the clip that hold the rod... then plug the opening where the rod used to go through... just like someone else posted, if your going to want passing gear, you'll have to pull the selector down manually to d2...
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Old 01-29-2009, 06:40 PM
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Guys it's NOT that hard to attach a detent cable to a throttle linkage. Using the detent valve instead of the manual valve makes for a much smoother downshift. Also it eliminates the possibility of seeing L1 at 65 MPH.
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Old 01-29-2009, 09:31 PM
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It seems to me the gentleman asked how to unhook the detent, not whether he should or not.

There are actually safety factors that dictate not needing or wanting a detent, or even modulated downshift with an automatic transmission.

90% of the TH350's I build don't use a kickdown.

In a very light car with a stout engine (T-bucket, etc), or big power cars (800+HP) particularly turbo'd and supercharged applications bad things happen when the trans downshifts under power.
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Old 01-29-2009, 09:48 PM
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I read the original question and took it at face value. A STREET rod. with a MILD 350, that's all. I still maintain that it's not that hard to hook up a detent cable.

I DO however see your point.
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Old 01-29-2009, 11:07 PM
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I ran mine disconnected for a while with no problems, but it short-shifted somewhat at WOT in Drive.
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Old 01-31-2009, 02:34 AM
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TV/ Detent Cable Plug

TV/ Detent Cable Hole Plug.
I finally found one, wasn't the company I was looking for but it's the same part.>>
http://www.bowtieoverdrives.com/cata...php?ITEMID=667
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