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1982 Trans Am TH200C Transmission Delayed Shifting Issue
Hi All, I have a 1982 Pontiac Trans Am. Not looking to mod it into a performance vehicle...keeping it true to its original specs: 305 V8, Turbo Hydramatic 200C, etc...just a pleasure cruiser for when I'm in town visiting my folks.
Anyways...my TH200C transmission developed a delayed shift problem. Only shifts at high RPM when the speed finally reaches 15-20mph or so. Shift happens right after slightly letting off the gas.
I have the 1982 Firebird service manual and am going through all the troubleshooting:
1) Verified correct TV cable adjustment. YES, I did drop the pan and verify there wasn't a big ol' gap between the TV lever paddle and the TV plunger. That would be too easy of a fix. Also verified the TV cable wasn't getting stuck or bound with the engine running in neutral (per the service manual).
2) Now I'm suspecting transmission governor assembly is bad? Waiting for the new replacement governor assembly to arrive this Wednesday. What comes first, the chicken or the egg? Maybe it's actually not shifting until a high RPM is reach, but rather until it finally reaches higher speed. This would indicate a governor issue.
Just can't figure out why it's shifting way too late. Transmission still in good shape. Clean fluid, no shavings, no slipping. Just very delayed shifting.
Appreciate your insights [img alt=""]data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7[/img]
Re: 1982 Trans Am TH200C Transmission Delayed Shifting Issue
UPDATE...
I installed a new transmission governor assembly (bought off of Amazon). NO EFFECT. Still having delayed shifting issues and have to get this beast up to ~20mph to get it to shift into 2nd gear (have to hold it at a stead 3000rpm mind you).
I'll give it one more hail mary with some lubegard but I'm not expecting that will resolve my issue. Will look into some possible stuck ball valves or maybe even the shift solenoid.
For reference, here's the original transmission governor assembly in the TH200C transmission. Looks fine, no discernable problems. And yes it came out that clean:
Re: 1982 Trans Am TH200C Transmission Delayed Shifting Issue
Originally Posted by Culdee
UPDATE...
I installed a new transmission governor assembly (bought off of Amazon). NO EFFECT. Still having delayed shifting issues and have to get this beast up to ~20mph to get it to shift into 2nd gear (have to hold it at a stead 3000rpm mind you).
I'll give it one more hail mary with some lubegard but I'm not expecting that will resolve my issue. Will look into some possible stuck ball valves or maybe even the shift solenoid.
For reference, here's the original transmission governor assembly in the TH200C transmission. Looks fine, no discernable problems. And yes it came out that clean:
Spoiler
Since you've verified the TV cable adjustment and ruled out binding issues, focusing on the governor assembly is a smart move. A faulty governor can definitely cause delayed shifting by not accurately sensing vehicle speed. After replacing the governor, monitor the shifting closely. Also, consider checking the valve body for any pressure issues, as that could contribute to delayed shifts. Good luck! I’ve been exploring options for independent bookmakers and I found https://nongamstopbetting.info/independent-bookmakers/ nongamstopbetting and it really helpful. They’ve reviewed a variety of bookmakers that aren’t tied to Gamstop, making it easier to find the right one. The site also goes into detail about the payment methods and bonuses offered by each bookmaker. It’s definitely a useful tool if you’re looking for an independent bookie.
TH200C Transmission Governor Assembly
Thanks for the update.
Last edited by MarjorieMathiso; Oct 26, 2024 at 12:20 AM.
Re: 1982 Trans Am TH200C Transmission Delayed Shifting Issue
Adjust the TV cable all the way opposite to a tight adjustment to the most loose position possible, take the care out and drive it, should clear up. Then you can reset the TV cable with the procedure in then book.
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