| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,080 Posts1,055,950 Members48,430 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Oct 2010 Posts: 202 'Bolter | | 'Bolter Joined: Oct 2010 Posts: 202 | Good day everyone
I have an SM420 in my 54 3100. The transmission started popping out of 4th gear while climbing hills and sometimes during acceleration. In investigating why it would do this I found that it is a result of a worn out pilot bushing. I found that there was only a remnant of the pilot bushing left in the end of the crankshaft.
The input shaft on my SM420 has around a 1/8" up-and-down play on it. My question is: How much play on the input shaft of my transmission is too much? At this point I am trying to determine what is normal so I know whether I need to fix this or not.
Thanks in advance for any comments
Walt Williams
La Verkin, UT
Last edited by 54Belair; 06/27/2013 2:11 PM.
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | A small amount of up & down play will be normal. Now would be a good time to pull the retainer & check the front brg. After you remove the retainer clean the brg. with brake clean or something. Shine a light on the brg. & slowly turn the shaft watching for any pits or scores on the balls & races. This brg is the first to go & can cause noises in the lower gears. It can be replaced without tearing down the trans.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
|
|
| |
