Transmission? problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Stepside65 · 04-20-2011, 02:22 AM

Got to drive the truck for the first time. Reverse worked just fine no issue at all. Forward wasn't quite as good. Something was shaking the entire truck. Anyone have any idea what it might be?
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**scotts62** · 04-20-2011, 06:47 AM

Guessing its the '63 and what trans?

Moving to engines and drive train to see if you can get some help on it.

Stepside65 · 04-20-2011, 09:00 AM

63 with a 350 and a sm420 out of a 74 GMC
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Wrenchbender Ret · 04-20-2011, 04:23 PM

The 74 used a SM465 4 speed. It has a larger front retainer where it fits in the bell houseing. Is the face of the trans flush up to the bell housing? If the shaking is when you are engauging the clutch its a clutch problem. If it is after the clutch is engauged then it is probably a driveshaft problem.

Stepside65 · 04-20-2011, 05:08 PM

Trans is flush with bell housing. Only acts up when in a forward gear. As soon a.s it is popped back out of gear it is fine. Talked with some gearheads at work and we came up with the conclusion that it might be severely low on gear oil. Will have to check and report back. The people at the local parts store already know me by name courtesy of this old monster.
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sysock · 04-20-2011, 09:01 PM

take a look at your U-joints as well. i had a U-joint going bad in my truck and under acceleration it was fine but deceleration it shook the truck to the point of no return, then when i would take it out of gear it would stop doing it.

04-20-2011, 02:22 AM	#1
Stepside65 Still Truckless! Join Date: Jul 2007 Location: Valrico, Florida Posts: 3,166	Transmission? problems Got to drive the truck for the first time. Reverse worked just fine no issue at all. Forward wasn't quite as good. Something was shaking the entire truck. Anyone have any idea what it might be? Posted via Mobile Device __________________ ~James Truckless 2009 Hyundai Sonata<~~Wife's sedanomatic 1997 Nissan Pickup Father-in-law's tonka toy I am forced to drive Founder of The 60-66 Club Tutor Et Ultor

04-20-2011, 06:47 AM	#2
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,243	Re: Transmission? problems Guessing its the '63 and what trans? Moving to engines and drive train to see if you can get some help on it. __________________ Scott 93 crew cab build Project 62

04-20-2011, 09:00 AM	#3
Stepside65 Still Truckless! Join Date: Jul 2007 Location: Valrico, Florida Posts: 3,166	Re: Transmission? problems 63 with a 350 and a sm420 out of a 74 GMC Posted via Mobile Device __________________ ~James Truckless 2009 Hyundai Sonata<~~Wife's sedanomatic 1997 Nissan Pickup Father-in-law's tonka toy I am forced to drive Founder of The 60-66 Club Tutor Et Ultor

04-20-2011, 04:23 PM	#4
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: Transmission? problems The 74 used a SM465 4 speed. It has a larger front retainer where it fits in the bell houseing. Is the face of the trans flush up to the bell housing? If the shaking is when you are engauging the clutch its a clutch problem. If it is after the clutch is engauged then it is probably a driveshaft problem.

04-20-2011, 05:08 PM	#5
Stepside65 Still Truckless! Join Date: Jul 2007 Location: Valrico, Florida Posts: 3,166	Re: Transmission? problems Trans is flush with bell housing. Only acts up when in a forward gear. As soon a.s it is popped back out of gear it is fine. Talked with some gearheads at work and we came up with the conclusion that it might be severely low on gear oil. Will have to check and report back. The people at the local parts store already know me by name courtesy of this old monster. Posted via Mobile Device __________________ ~James Truckless 2009 Hyundai Sonata<~~Wife's sedanomatic 1997 Nissan Pickup Father-in-law's tonka toy I am forced to drive Founder of The 60-66 Club Tutor Et Ultor

04-20-2011, 09:01 PM	#6
sysock Registered User Join Date: May 2010 Location: towanda, PA Posts: 55	Re: Transmission? problems take a look at your U-joints as well. i had a U-joint going bad in my truck and under acceleration it was fine but deceleration it shook the truck to the point of no return, then when i would take it out of gear it would stop doing it.



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