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nice72 · 04-05-2008, 09:03 AM

Hey, I am new to the site. I found this old thread and have a questiong about the input shaft. First let me tell you about my car. I have a 72 cutlass supreme with 1974 455 with a muncie 4 speed. My father and i coverted from auto to manual about 4 years ago. We fabricated a plate for the swivel ball and had to shorten the z bar since the swivel ball was closer to the frame being treaded into the bracket instead of the engine. The next problem was the pilot bearing...i ended up having a machine shop machine me a pilot bearing to fit in the crank. Alright heres my question...My tranny will pop out of 2nd gear every time you down shift from 3rd to 2nd. The tranny has no problems shifting through the gears when taking off and has no problem down shifting from 4th to 3rd. I have had new synchros put in and it did not change the problem. I am wondering could this problem be due to the fact that i did not shorten the input shaft, or possibly when i had the snychros done they didn't do it right or ripped me off? I would greatly appreciate input on this because before i spend another 500-1000 dollars on the transmission rebuild when that might not be the problem. Also i have a lot of other questions the the 455 and am reading a lot of old threads so hopefully i don't ask questions that have already been asked. Thank you in advance for any input you guys give me.

04-05-2008, 09:03 AM	#5 (permalink)
nice72 Junior Member Join Date: Apr 2008 Posts: 5	Trimming input shaft Hey, I am new to the site. I found this old thread and have a questiong about the input shaft. First let me tell you about my car. I have a 72 cutlass supreme with 1974 455 with a muncie 4 speed. My father and i coverted from auto to manual about 4 years ago. We fabricated a plate for the swivel ball and had to shorten the z bar since the swivel ball was closer to the frame being treaded into the bracket instead of the engine. The next problem was the pilot bearing...i ended up having a machine shop machine me a pilot bearing to fit in the crank. Alright heres my question...My tranny will pop out of 2nd gear every time you down shift from 3rd to 2nd. The tranny has no problems shifting through the gears when taking off and has no problem down shifting from 4th to 3rd. I have had new synchros put in and it did not change the problem. I am wondering could this problem be due to the fact that i did not shorten the input shaft, or possibly when i had the snychros done they didn't do it right or ripped me off? I would greatly appreciate input on this because before i spend another 500-1000 dollars on the transmission rebuild when that might not be the problem. Also i have a lot of other questions the the 455 and am reading a lot of old threads so hopefully i don't ask questions that have already been asked. Thank you in advance for any input you guys give me.