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Builds and Journals This is where the magic happens. Photograph & document your GMC build progress for posterity.
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  #41  
Old December 18th, 2021, 07:21 PM
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FetchMeAPepsi FetchMeAPepsi is offline
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Default Re: '65 GMC 1500 project. From the Netherlands

That wood is going to look great! Do you plan to coat it or anything or just leave it natural? A quick look online says it's naturally resistant to just about everything. It's a wonder that it ever rots in the forest, haha!
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Some people are like slinkys. Not worth much but funny as heck when pushed down stairs.
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  #42  
Old December 18th, 2021, 07:48 PM
Prowbar Prowbar is offline
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Truck: 1965 GMC 1500, 305E, SM420
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Default Re: '65 GMC 1500 project. From the Netherlands

Quote:
That wood is going to look great! Do you plan to coat it or anything or just leave it natural? A quick look online says it's naturally resistant to just about everything. It's a wonder that it ever rots in the forest, haha!
Thanks. Yes, I'll stain it with oil. If left natural, the wood turns to a light gray over time. Because it is so durable and hard it would definitely make sense to use it as a bed wood. Of course it will be protected when hauling stuff like engine blocks etc haha
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  #43  
Old January 5th, 2022, 06:47 PM
Prowbar Prowbar is offline
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Default Re: '65 GMC 1500 project. From the Netherlands

So... in the last few weeks, I finished the truck for inspection. The inspection was on Monday the 3rd, passed the first try. Right now I'm working on the license plates and the last insurance-related things. So hopefully by the end of the week, possibly next week I have the GMC on the road!

From then on I'll start to focus on the aesthetic side, for example, the bed floor and the V6 badges, and rust repairs. But propane conversion will be first and a gearbox swap.

The current SM420 is pretty clapped out. It whines to high heaven and the 2nd gear synchro is shot. Saturday I hope to pick up another 420 as a temporary gearbox while I rebuild the 'numbers matching' 420. The 420 I hope to pick up sat behind a plaid valve cover '63 305! Hoping to take a glance at those plaid valve covers too!
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  #44  
Old January 8th, 2022, 06:36 PM
Prowbar Prowbar is offline
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Default Re: '65 GMC 1500 project. From the Netherlands

Brought the SM420 home. This shifting pattern is much tighter, you get the impression that you're actually shifting instead of stirring in the soup...

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Took the shifter out and removed the top cover and inspection (PTO) cover. Drained the old fluid and cleaned the magnet on the bottom. All looks good, a much better tranny than the current one. Synchro's all look to be in good shape.

Hope to install this tranny soon. Should take care of the shifting issues. I think I'll keep this tranny installed. Rebuilding the other one might improve the synchros, but will cost a lot to rebuild and the shift forks are still worn, resulting in the sloppy shifting.

The guy I visited had a '63 305D. Those plaid covers are something else, arent they?
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  #45  
Old January 22nd, 2022, 08:41 PM
Prowbar Prowbar is offline
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Default Re: '65 GMC 1500 project. From the Netherlands

Installed the "new" SM420 today. Before installing I cleaned her up and painted her black. Also replaced the rear (yoke) oil seal, as the spring wore through the rubber.

When I pulled the shifter from the old tranny, it turned out that it had the later SM465 shifter! I know these interchange but the 465 is a 2 piece shift fork design to keep the vibrations to a minimum. Turns out the roll pin that secures the fork to the shifter was so loose it created the sloppy shifting.

Anyway, when removing the old tranny the bellhousing and yoke bolts were snug but not tight...

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When turning the transmission by hand you can hear the noisy ball bearings.

Anyway, out with the old and in with the new. I used the yoke and speedometer connection from the old tranny as the one on the 'new' tranny were for 4.56 or even lower. Also reused the old 'donut'. See photos. Cleaned the throwout bearing and greased her up, when through the whole clutch mechanism to properly clean and grease the moving points.

The new tranny shifts a whole lot better! The 2nd gear synchro works like it should and the tranny is tight.

However, when shifting from 3rd to 4th and the RPMs drop to 800 or so and you accelerate there is a strange noise... Above a certain rpm (about 1400 I guess) it is gone, no matter the load applied to the transmission.. the old tranny had the same thing, so it probably is not the tranny but I'm not sure what it is. It sounds like it comes from the tranny, not the rear axle or something like that. I'll try to record a video capturing the noise.

Have been cruising with the GMC some lately. According to my calculations, I'm getting 13.4 MPG. Was expecting worse so not bad. Been gathering parts for the propane conversion as that will be next, together with the IPE bedwood.

Would like to upgrade the exhaust though, at least switch the muffler. Right now it has the factory muffler which is quiet, a little too quiet. Hoping to find a muffler that is a little louder but lets you hear the V6 rumbling. Right now I can barely hear the engine in the cab. I still have the factory single exhaust and muffler. Any suggestions please let me know

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