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03-30-2009 #1
New to Pro-Touring
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- Apr 2008
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- 73
TH350 second gear disengages under load
I had my tranny rebuilt last year by a proffesional and convinced it was a "plug and play" job for me I got disappointed.
The problem is that when I floor the pedal on second gear it disengages and the engine revs unloaded. When I release the throttle it engages again to maybe disengage immidiatly when I floor the pedal again. To me it seems that this is a little bit random but more times than not this happens.
I have a 406 CSB with Brodix heads and a hyd. roller in a 67 camaro convertible.
The tranny is inforced and equiped with a shiftkit, I don't know the exact specs but can find out if they are important. If I drive moderate the tranny behaves okey. I very concern to over rev the engine and realize serious damages.
Please help!!
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03-30-2009 #2
Registered User
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- Aug 2005
- Location
- Patterson, NY
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- 784
It might be the downshift cable doing it, though I really don't know.
Jason Scheer
03-30-2009 #3
New to Pro-Touring
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- Apr 2008
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I'll try without it.
Additional info:
This happens no matter if I manually position the stick on the second gear or in Drive position. But, only the second gear..
04-08-2009 #4
Registered User
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- Sep 2006
- Location
- Southern Indiana
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- 4,709
Try bad converter. TH350 from m y 71 MC did this and after loaned to buddy he installed different converter and it was fine. Probably bad one way roller clutch in side it.
04-08-2009 #5
Registered User
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- Sep 2006
- Location
- Henderson,NV
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- 2,870
I never had any luck with 350's. I blew up two of them with a 355.
Todd
04-08-2009 #6
New to Pro-Touring
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- Apr 2008
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- 73
Latest info.
I had a lot of conversation with people having deep-deep knowledge in this transmissions and realized this problem is something unique.
Finally I did what Jason proposed and disconnected the kickdown cable and whoooho, the problem was gone. Not a single time did this problem show up during my tests.
I connected the cable again but slacked it a little bit. It's tuned so the transmission still do the kickdown but isen't stretched as previously.
A guy told me the pressure in the tranny is controlled by the position of this cable and when the pressure is high a leakage somewhere in the valvebody may result in this kind of behaviour.
What's your opinion?
I will drive it this way now and have it fixed (probably new valvebody) under the winter season.
Thanks for all help. /Emanuel
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