The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1984 C10 BBC 427 feels like its lacking in its true performance abilities.

Bishops Trucks · 03-12-2014, 10:53 AM

Shifting a 400 trans manually does not hurt them in any way. I have one with a shift kit in it that I had in a 71 longbed truck. It had a GMPP 350 HO/ 330 hp motor. I ran that truck hard and constantly shifted it manually, never had a single problem with it. Have you checked your harmonic balance? Sometimes they go bad (the rubber between the two halves) and start to slip. That could be part of your issues.

03-12-2014, 10:53 AM	#11
Bishops Trucks KEEP ON TRUCKIN' Join Date: Jun 2005 Location: Sterling, Va. Posts: 5,730	Re: 1984 C10 BBC 427 feels like its lacking in its true performance abilities. Shifting a 400 trans manually does not hurt them in any way. I have one with a shift kit in it that I had in a 71 longbed truck. It had a GMPP 350 HO/ 330 hp motor. I ran that truck hard and constantly shifted it manually, never had a single problem with it. Have you checked your harmonic balance? Sometimes they go bad (the rubber between the two halves) and start to slip. That could be part of your issues. __________________ JIM '97 GMC Sierra K1500 '95 Chevy Silverado C1500 '71 Cheyenne Z71 / LT1 & 4-Speed SWB K/10 Father/Son Project http://www.youtube.com/watch?v=4l689JKXPnA http://67-72chevytrucks.com/vboard/payments.php "LIVIN' FREE FOREVER"