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Old 11-30-2007, 03:44 AM
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TH350 Auto Shift Woes

I changed the carb jets (new 750 Mighty Demon) on my truck, nothing too big. Just increase of jet size to richen the carb, I put the carb back and made sure it was installed properly but when I test drove the truck it wasn't shifting (TH350) properly. It was surging and not going in gear. Prior to pulling the carb, the truck ran fine.

I also notice the kick-down was struck so I fixed that part underneath the tranny by removing the cable bind. When I drove the truck again, it ran a little better but still has problems. I know for sure it won't run on the highway at higher speeds.

I've noticed that the truck was two quarts low on transmission fluid so I have a little leak.

What could be my problem. I think the transmission needs servicing but would the carb jet change affect my performance that much? I changed back to the original jets but the truck still performs crappy.

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Last edited by juiced66malibu; 11-30-2007 at 09:08 AM.
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Old 12-01-2007, 08:53 PM
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Does it feel like it starts off in 2nd gear, like no first at all, and feel like its redlining for a long time before shifting into third?
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Old 12-01-2007, 08:57 PM
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If so, I would check where the kickdown cable connects to the tranny. Sometimes the cable housing can get stuck on top of the transmission and cause it to pull the line out. That causes some really messed up shifting. Its happened to me once before and I thought my tranny was gonna blow up, and I swore up and down that I checked the kickdown like a thousand times, but once I actually looked at both ends it was pretty obvious and two seconds pushin it back in fixed everything
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Old 12-01-2007, 09:09 PM
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The kick down cable adjustment is critical. It changes line pressures inside of the transmission. Sounds to me like it is out of adjustment. Is the cable wire at the carb end loose and sagging, or tight?
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Old 12-01-2007, 09:16 PM
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If you cant see any problems with the cable try just taking it off alltogether and driving it. Not a permanent fix, but sometimes its hard to see a cable problem while its hooked up. But it seems to me that it would have to be something to do with the kickdown being as nothing else changed.
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Old 12-01-2007, 09:58 PM
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Thanks for all your replys. And yes it was my kick-down cable. The cable was tight with no sag at the carb bracket. I adjusted the cable to put in slack and it fixed the problem.

Last edited by juiced66malibu; 12-02-2007 at 11:35 AM.
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