Mike C Posted January 1 Share Posted January 1 Speedometer dosen't work. Put a drill on the transmission end. Speedometer had movement, indicating that the cable was ok. Checked the Speedometer end of cable with the wheels moving. Cable was not spinning indicating problem in the transmission. Removed the cover and the worm gear on the shaft appeared not to be centered , I was able to move it a bit with my finger but did not want to force it.. Question is should the worm gear be in the cente of the hole? 😊 Thanks in advance for any help. Quote Link to comment Share on other sites More sharing options...
cny first gen 71 Posted January 2 Share Posted January 2 I belive there is a little clip that holds the gear on the shaft. If you pull the tail shaft off you should be able to see what's wrong. That is from memory of many years ago. 3 Quote Link to comment Share on other sites More sharing options...
Leghome Posted January 2 Share Posted January 2 The tail shaft should come off by taking the four bolts out of it and slide off the rear of the tranny. At least that is how my 700r4 is, A lot easier than I ever thought it would be 2 Quote Link to comment Share on other sites More sharing options...
Mike C Posted January 17 Author Share Posted January 17 Thanks guys took me a while to get to the job. Missing the clip that keeps the gear from sliding along the shaft. Now the search begins to find one. It's for a TH400. 2 Quote Link to comment Share on other sites More sharing options...
1970mcss Posted January 17 Share Posted January 17 It shouldn't be hard to find. I sold a bunch of those back in the day. Maybe check a gmc dealer they may still have one in stock 1 Quote Link to comment Share on other sites More sharing options...
1970mcss Posted January 17 Share Posted January 17 The part number is 6261781. Amazon shows one but they want 9.00. Checked ebay and they show one 2.95 plus shipping. Like I posted a local dealer might have one 1 Quote Link to comment Share on other sites More sharing options...
Mike C Posted January 17 Author Share Posted January 17 Thanks for the info. The clip for a TH400 is a little bit different than the one for a TH350 transmission. The mounting slot in the drive gear itself is also different. I'm waiting for a call back from the local transmission repair shop in case they have one. Quote Link to comment Share on other sites More sharing options...
Mike C Posted January 19 Author Share Posted January 19 On 1/17/2023 at 2:56 PM, Mike C said: Thanks for the info. The clip for a TH400 is a little bit different than the one for a TH350 transmission. The mounting slot in the drive gear itself is also different. I'm waiting for a call back from the local transmission repair shop in case they have one. Found the clip. Talked to a guy that knew a guy that knew a guy. Turns out he builds high performance engines/transmissions. Thanks everyone ☺ 2 Quote Link to comment Share on other sites More sharing options...
1970mcss Posted January 19 Share Posted January 19 That is excellent Quote Link to comment Share on other sites More sharing options...
Dtret Posted January 20 Share Posted January 20 3 hours ago, Mike C said: Found the clip. Talked to a guy that knew a guy that knew a guy. Turns out he builds high performance engines/transmissions. Thanks everyone ☺ I think I know the same guy. Some guy told me about him. Quote Link to comment Share on other sites More sharing options...
Mike C Posted January 20 Author Share Posted January 20 There's always gonna be a "a guy". Quote Link to comment Share on other sites More sharing options...
Leghome Posted January 20 Share Posted January 20 My guy says he doesn't know the guy who the guy who knows but also said he knows not much about what he knows Quote Link to comment Share on other sites More sharing options...
cbolt Posted January 20 Share Posted January 20 18 hours ago, Mike C said: There's always gonna be a "a guy". who knows a guy..... Quote Link to comment Share on other sites More sharing options...
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