09-02-2017, 12:52 PM | #1 |
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Longbed driveshafts
To the guys that race longbeds,
What are you using for a driveshaft? I'm having vibration issues with a 3 1/2" mild steel shaft at high speeds and high rpms and am trying to convert back to a HD-style 2-piece shaft. I'm curious as to what everyone else is using. Thanks in advance!
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Chris 1966 Chevy C10 LWB, 434 sbc, TH350, 12-bolt, factory suspension, pump gas 7.02 @ 95.8, 1.45 60' 1965 Chevy C10 LWB, 355 sbc, TH350, daily driver |
09-04-2017, 12:01 AM | #2 |
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Re: Longbed driveshafts
I run a custom 2 piece on mine.
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09-06-2017, 11:57 AM | #3 |
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Re: Longbed driveshafts
Thanks for the reply!
I had a local shop build a custom 2-piece for mine, also. It's based on a 2-piece shaft from a 68' C-20, which uses the HD-style carrier bearing. Have you had any trouble out of your carrier bearing?
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Chris 1966 Chevy C10 LWB, 434 sbc, TH350, 12-bolt, factory suspension, pump gas 7.02 @ 95.8, 1.45 60' 1965 Chevy C10 LWB, 355 sbc, TH350, daily driver |
09-10-2017, 05:32 PM | #4 |
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Re: Longbed driveshafts
No problems yet, my truck is 4 - linked so doesn't have the factory crossmember, actually my truck has no factory crossmembers at all just the frame rails are stock.
So anyway not sure that the steady bearing is even from anything in particular or just a heavy duty universal piece, guy that did the 4 - link had it built. So far the only thing I've ever hurt on it was I ripped apart the trans yoke, it split and ripped apart, went to a chrome moly piece after that, the rest has survived fine so far.
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Speed is just a matter of money, question is how fast can you afford to go? 8.95@148.97mph all motor haven't tried bottle yet Sponsored by: Getz Oilfield Consulting Hard Candy Customs |
09-10-2017, 09:08 PM | #5 | |
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Re: Longbed driveshafts
Quote:
Thanks again for the input!
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Chris 1966 Chevy C10 LWB, 434 sbc, TH350, 12-bolt, factory suspension, pump gas 7.02 @ 95.8, 1.45 60' 1965 Chevy C10 LWB, 355 sbc, TH350, daily driver |
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01-14-2018, 01:29 PM | #6 |
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Re: Longbed driveshafts
pstds carbon fiber 69" long on mine. held a 1.4x 60 ft at 4000 lbs so far. hoping for low 1.3s next year. lifetime replacement warranty, but they aren't cheap.
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01-14-2018, 06:59 PM | #7 | |
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Re: Longbed driveshafts
Quote:
Thanks
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01-14-2018, 07:27 PM | #8 |
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Re: Longbed driveshafts
I'm pretty sure it's 3.75" give the guys a call and they will hook you up. Received mine in about a week. Light as it gets.
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1950 3600. 370cid, th400, 9", billet 80mm turbo under the bed, 4 link coilovers, hoping for a single digit! http://67-72chevytrucks.com/vboard/s...d.php?t=380212 |
01-14-2018, 07:27 PM | #9 |
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Re: Longbed driveshafts
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1950 3600. 370cid, th400, 9", billet 80mm turbo under the bed, 4 link coilovers, hoping for a single digit! http://67-72chevytrucks.com/vboard/s...d.php?t=380212 |
01-14-2018, 10:21 PM | #10 |
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Re: Longbed driveshafts
Anybody run an aluminum single piece driveshaft on a long bed? Almost to the point where i need to get a drive shaft made for my 65 long bed. turbo 5.3 ls and 4l80e will be around 550-600 hp at the wheels. Going to leave off the foot brake no transbrake yet
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01-14-2018, 10:59 PM | #11 |
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Re: Longbed driveshafts
Gotta look at the critical speed for the length, power, and weight. Another reason I went with the carbon fiber was if it breaks, damage will be minimal.
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1950 3600. 370cid, th400, 9", billet 80mm turbo under the bed, 4 link coilovers, hoping for a single digit! http://67-72chevytrucks.com/vboard/s...d.php?t=380212 |
01-18-2018, 09:10 PM | #12 |
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Re: Longbed driveshafts
For those of you running a 2 piece driveshaft which type of carrier bearing are you using? The aluminum and poly type that can be bought through ccp? or the wide oem type?
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01-19-2018, 12:32 AM | #13 |
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Re: Longbed driveshafts
I would never use that POS light duty carrier bearing up top. Those are why so many people dislike 2pc driveshafts. I always use the HD carrier bearing on the bottom.
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01-25-2018, 02:00 PM | #14 |
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Re: Longbed driveshafts
I'm planning on having one made in the next couple weeks. The shop I'm using recommended a 4" alum shaft for my truck. ~71" length.
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01-28-2018, 07:37 PM | #15 | |
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Re: Longbed driveshafts
Quote:
The Driveshaft Shop (driveshaftshop.com) told me last week, after they suggested it, that a one-piece aluminum driveshaft 69" long at the predicted max rpm (based on 160 mph) would not hold together. They said a carbon fiber probably wouldn't either and I needed a two piece steel. That was mid last week and I still have not heard back from them. I might call Denny's Driveshaft this week and see what they would put together. The Driveshaft Shop has a good repuation and they are local but i'm not impressed with them right now.
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01-29-2018, 08:49 AM | #16 |
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Re: Longbed driveshafts
John what max rpm did you use? Predicted rpm at 160 at 1 to 1 or the max you plan to turn your engine? My little calculator shows 8770 in 4th gear and a bit over 7000 in 5th for 160
Jimmy
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01-29-2018, 12:22 PM | #17 | |
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Re: Longbed driveshafts
Quote:
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01-29-2018, 08:43 PM | #18 | |
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Re: Longbed driveshafts
Quote:
I ran an online calculator I found to figure out theoretical top speed and it was over 240 mph. I think I used a max rpm of 6,500 rpm and even with the 4.56 rear, the double overdrive (0.50 6th gear) sets it up for bonneville. I'd probably need 1,200+ hp to get THAT kind of speed out of this big brick so figured 160 mph was reasonable (if I was stupid enough to try to get going that fast).
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01-29-2018, 08:47 PM | #19 | |
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Re: Longbed driveshafts
Quote:
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01-30-2018, 08:14 AM | #20 |
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Re: Longbed driveshafts
I would be looking at pulling gear out to get the drive shaft speed down to 6500 at 160 and that will also help the pinion bearings survive for a long top speed run. It will take a lot of power to get to 160 even with the drag that a truck produces. Then there is the nut factor at speed with the poor aerodynamics and little or no down force.
Jimmy
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
01-30-2018, 10:15 AM | #21 | |
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Re: Longbed driveshafts
Quote:
thanks
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01-30-2018, 08:23 PM | #22 |
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Re: Longbed driveshafts
There is always a taller tire.
Jimmy
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
02-10-2018, 10:53 PM | #23 |
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Re: Longbed driveshafts
This, I recently rebuilt the posi and trans and was contemplating a gear swap from 4.11 to 3.42. Tires are cheaper and easier.
I also run a 2 piece with the hd carrier. There isn’t a time I’m driving I don’t abuse my truck. I’ve done 1/8th burnouts, donuts, rolling burnouts on the highway. Nothing wrong with a 2 piece.
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02-11-2018, 07:49 AM | #24 |
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Re: Longbed driveshafts
I've got Precision in Tampa building me a 2-pc steel driveshaft. They also recommended i upgrade my pinion yoke (as that would be the next weakest link) so I am doing that as well. Should see everything here this week.
When they asked what my top speed would be I said "you tell me what the limit on the shaft is." In reality, the only time the truck will even see triple digits is in the quarter mile and the occasional freeway on-ramp/short burst (just because). I still have to ask Matt what the critical driveshaft speed will be for my setup but whatever it is I'll just use it as my speed limiter. I've got 20's all around but should be able to get a slightly taller tire out back when these ones get spent (they're still new).
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02-11-2018, 10:18 AM | #25 |
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Re: Longbed driveshafts
Fit the new 4" steel shaft up this week. It was pretty light, almost seemed like aluminum but wasn't. Im happy with it for $250. They were able to use the stock yoke from the 4l80e and the small'ish 1310 rear joint. Should be fine for my setup. I wont know for a little while till I get it on the road though.
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