# Th350 transmission no 3rd gear **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** van, chevrolet\ **Created:** [March 20, 2022, 9:51pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106 "2022-03-20T21:51:01Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Demiwalexander\_180039](https://avatars.discourse-cdn.com/v4/letter/d/df788c/32.png) [@Demiwalexander\_180039](https://community.cartalk.com/u/Demiwalexander_180039)\ **Post date:** [March 20, 2022, 9:51pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/1 "2022-03-20T21:51:01Z")
I have in 1984, Chevy G 20 With a 305 and turbo 350. The vehicle runs and drives flawlessly. However I changed the spark plugs and some dome lighting, and I heard a wire short out which blew two fuses both Which controlled dash lights and tail lights. I replaced both fuses five minutes later went for a drive again and I don’t have third gear. What did I do. No it’s not a governor or the linkage or the vacuum on the module ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [March 20, 2022, 10:01pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/2 "2022-03-20T22:01:27Z")
Have you’ve ever had the transmission fluid/filter serviced? Tester ---
**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\ **Post date:** [March 21, 2022, 12:12am UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/3 "2022-03-21T00:12:23Z")
I am not a mechanic so bear with me. My wild guess is that it’s barely possible that you screwed up the torque converter lockup solenoid but AFAIK that year those transmissions still had hydraulic controls vs. electronic. And as Tester says, it could also simply be coincidence. ---
**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\ **Post date:** [March 21, 2022, 1:01am UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/4 "2022-03-21T01:01:12Z")
I think you need to go to a trans shop. I had a mechanic blow out the solenoid for my 4th gear. I told him not to but he put a full 12 volts on it testing it and that was enough. So I think some actuator got fried in the process. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [March 21, 2022, 3:40am UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/5 "2022-03-21T03:40:03Z")
Inspect the throttle valve cable connection at the carburetor and transmission. ---
**Author:** ![Demiwalexander\_180039](https://avatars.discourse-cdn.com/v4/letter/d/df788c/32.png) [@Demiwalexander\_180039](https://community.cartalk.com/u/Demiwalexander_180039)\ **Post date:** [March 21, 2022, 1:06pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/6 "2022-03-21T13:06:00Z")
Thanks guys, I just changed the fluid on the off chance that may have been the problem. No change :/. I was thinking maybe solenoid as well. I may bring it in today ---
**Author:** ![Demiwalexander\_180039](https://avatars.discourse-cdn.com/v4/letter/d/df788c/32.png) [@Demiwalexander\_180039](https://community.cartalk.com/u/Demiwalexander_180039)\ **Post date:** [March 21, 2022, 1:07pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/7 "2022-03-21T13:07:34Z")
Sorry for my ignorance, what should I be looking for? ---
**Author:** ![Demiwalexander\_180039](https://avatars.discourse-cdn.com/v4/letter/d/df788c/32.png) [@Demiwalexander\_180039](https://community.cartalk.com/u/Demiwalexander_180039)\ **Post date:** [March 21, 2022, 1:26pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/8 "2022-03-21T13:26:42Z")
![image](https://global.discourse-cdn.com/cartalk/original/3X/4/7/47f1a9bf9ed1f4f9c099e44e8f1a3ff1e54528a4.jpeg) ---
**Author:** ![Scrapyard-John](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@Scrapyard-John](https://community.cartalk.com/u/Scrapyard-John)\ **Post date:** [March 21, 2022, 1:29pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/9 "2022-03-21T13:29:54Z")
The TV cable should move in unison with the throttle cable. It should be taught at wide open throttle and pretty much no slack but not “tight” when the throttle is closed. If you’ve knocked it out of adjustment, it’ll change the shift points. It’ll stack shifts if it’s too loose, or delay shifts if it’s too tight. Not sure how it would make you lose third. Maybe if it was extremely tight…? ---
**Author:** ![Scrapyard-John](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@Scrapyard-John](https://community.cartalk.com/u/Scrapyard-John)\ **Post date:** [March 21, 2022, 1:31pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/10 "2022-03-21T13:31:29Z")
I think you might be on to something there, maybe. Check the fuses in the fuse panel. Should be one in there for trans if it has any electronic controls, I’d think. ---
**Author:** ![Demiwalexander\_180039](https://avatars.discourse-cdn.com/v4/letter/d/df788c/32.png) [@Demiwalexander\_180039](https://community.cartalk.com/u/Demiwalexander_180039)\ **Post date:** [March 21, 2022, 1:41pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/11 "2022-03-21T13:41:29Z")
I really appreciate your Help guys I was doing a tuneup because we’re going on a family vacation in just a few days supposed to be taking the van. And what’s interesting is I see that cable coming off of the transmission going up to the engine compartment but there is only one throttle cable on the carburetor and that connects to the gas pedal below it there’s no other cable ---
**Author:** ![Demiwalexander\_180039](https://avatars.discourse-cdn.com/v4/letter/d/df788c/32.png) [@Demiwalexander\_180039](https://community.cartalk.com/u/Demiwalexander_180039)\ **Post date:** [March 21, 2022, 8:53pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/12 "2022-03-21T20:53:13Z")
UPDATE Sorry for the confusion - I have a turbo 400 transmission ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [March 21, 2022, 9:53pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/13 "2022-03-21T21:53:47Z")
OP can change thread title. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [March 21, 2022, 10:18pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/14 "2022-03-21T22:18:20Z")
TheTH400 relies on a vacuum signal for upshift timing. Measure the vacuum at the modulator with a vacuum gauge and check for transmission fluid leaking from the modulator vacuum nipple. ---
**Author:** ![Demiwalexander\_180039](https://avatars.discourse-cdn.com/v4/letter/d/df788c/32.png) [@Demiwalexander\_180039](https://community.cartalk.com/u/Demiwalexander_180039)\ **Post date:** [March 21, 2022, 10:21pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/15 "2022-03-21T22:21:53Z")
There is a small amount of trans fluid coming from the mod when I removed the hose, pressure is high and can feel a hard suction, 16. Literally under here now ---
**Author:** ![Demiwalexander\_180039](https://avatars.discourse-cdn.com/v4/letter/d/df788c/32.png) [@Demiwalexander\_180039](https://community.cartalk.com/u/Demiwalexander_180039)\ **Post date:** [March 21, 2022, 10:25pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/16 "2022-03-21T22:25:04Z")
For a long time the hose connected to the mod was rotted a but the transmission still shifted just a high rpm and very hard. I connected hose and ran like a gem. Until the other day when above problem started. Could an electric kick down selenoid cause this issue? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [March 21, 2022, 11:00pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/17 "2022-03-21T23:00:51Z")
What was the color was the transmission fluid when you drained it? ![image](https://global.discourse-cdn.com/cartalk/original/3X/e/8/e890187d0668ed0c9e85e644b3ae11a03f72ef73.jpeg) Tester ---
**Author:** ![Demiwalexander\_180039](https://avatars.discourse-cdn.com/v4/letter/d/df788c/32.png) [@Demiwalexander\_180039](https://community.cartalk.com/u/Demiwalexander_180039)\ **Post date:** [March 21, 2022, 11:06pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/18 "2022-03-21T23:06:12Z")
It looked really good it was pretty much bright red like the second one down. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [March 21, 2022, 11:08pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/19 "2022-03-21T23:08:49Z")
> [@Demiwalexander\_180039](#): > > There is a small amount of trans fluid coming from the mod when I removed the hose, Did you replace the vacuum module? Tester ---
**Author:** ![Demiwalexander\_180039](https://avatars.discourse-cdn.com/v4/letter/d/df788c/32.png) [@Demiwalexander\_180039](https://community.cartalk.com/u/Demiwalexander_180039)\ **Post date:** [March 21, 2022, 11:10pm UTC](https://community.cartalk.com/t/th350-transmission-no-3rd-gear/183106/20 "2022-03-21T23:10:54Z")
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