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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!
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| | | | Joined: Dec 2002 Posts: 3,447 Moderator - The Electrical Bay | | Moderator - The Electrical Bay Joined: Dec 2002 Posts: 3,447 | Welcome here Heng. This question is better asked in the driveline shop, so, I'll move it there for you.
Another quality post.
Real Trucks Rattle
HELP! The Paranoids are after me!
| | | | | Joined: Feb 2004 Posts: 29,933 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,933 | Short answer- - - - -reduce the throttle pressure a little. There's a mechanical linkage from the carburetor to the transmission with a turnbuckle-type adjustment in it. To make the trans shift sooner, adjust the linkage so the small bellcrank on the side of the transmission does not travel as far when the throttle is opened. VERY small adjustments can make a big difference in shift points, so don't overdo it.
Longer answer- - - -Adjusting throttle pressure for a sooner, softer shift sometimes reveals a more serious problem- - - - -worn or maladjusted bands. You'll need a factory service manual to do a proper band adjustment. There aren't any real shortcuts to this procedure, and shade tree methods usually result in worse performance and possible internal damage.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | Thanks, Jerry
Someday I hope to have my H-M back on the road - I am not looking forward to making those "touchy" adjustments, again. | | | | | Joined: Nov 2019 Posts: 3 Moderated | | Moderated Joined: Nov 2019 Posts: 3 | Appreciate the reply Jerry.
I took her to a classic car mechanic to see if he could diagnose the issue and do the proper fix, I stressed to him that the H-M was different than the power glides but he was very confident that he could fix the issue. I’ll keep you guys posted on the repair.
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