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#1 |
"brand new second-hand"
Join Date: Feb 2007
Location: White House, Tennessee
Posts: 526
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drive shaft for BBC converson
I have installed a 454 in my 69 truck with a turbo 400. I have a 3/4 ton camper special with a standard long bed. i am trying to connect the drive shaft and things don't seem to fit. Is the drive shaft length different for a big block install instead of the factory small block? what is the best solution for my situation? new drive shaft? cut mine down( how much?) thanks for any and all help. Steve
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#2 |
Registered User
Join Date: Apr 2004
Location: Las Vegas, NV
Posts: 2,188
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Re: drive shaft for BBC converson
If you used the factory mounting location (or at least near it) you shouldnt need a new shaft. If you moved the motor back too far, you may need to have your shaft cut down. I need a little more info to tell you whats wrong
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RIP EastSideLowLife '72 C20 SWB convert. 5 lug, LS1/4l60e |
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#3 |
"brand new second-hand"
Join Date: Feb 2007
Location: White House, Tennessee
Posts: 526
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Re: drive shaft for BBC converson
great-I bought new BB engine towers and installed them in the 1st and 2nd frame holes (top of frame) and the bottom part of the bracket into the farthest back hole on the crossmember (under the engine). the trans crossmemeber was moved back 1 inch- the holes were in the frame from the factory and I guessed that was for locating the bb/setup. the truck was stock with a 350 and turbo 400. everything motor and trans seemed to fit when i moved the trans crossmember back, otherwise, the engine mounts didn't seem to mount correctly up front...does that make sense?
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#4 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: drive shaft for BBC converson
You moved the engine back. If you moved it one inch, you'll need to shorten the front half of the driveshaft an inch to compensate.
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I'm on the Instagram- @Gearhead_Kevin |
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#5 |
"brand new second-hand"
Join Date: Feb 2007
Location: White House, Tennessee
Posts: 526
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Re: drive shaft for BBC converson
ttt
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Steve 69 3/4t custom camper tilt,am/fm,speed warning,air gauge,buddy buckets,aux battery, big block,p/s,p/b,a/c 67 Camaro 96 Impala ss-sold 04 hybrid Honda-saving gas for the blue truck!:b69: |
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#6 |
"brand new second-hand"
Join Date: Feb 2007
Location: White House, Tennessee
Posts: 526
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Re: drive shaft for BBC converson
is it possible to install the engine towers backwards? I mean the ones I haVE SAY RIGHT OR LEFT BUT IS THAT FROM THE FRONT OF THE ENGINE OR THE BACK OF THE ENGINE?
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Steve 69 3/4t custom camper tilt,am/fm,speed warning,air gauge,buddy buckets,aux battery, big block,p/s,p/b,a/c 67 Camaro 96 Impala ss-sold 04 hybrid Honda-saving gas for the blue truck!:b69: |
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#7 |
BB70c10
Join Date: Nov 2007
Location: wilsons mill,NC
Posts: 140
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Re: drive shaft for BBC converson
as far as i know,all parts listed as right or left as an option,are as viewed from the drivers seat(left being drivers side and rt being pass. side).Working at a dealership i've never seen it any different.if thats how they are, then they should be right.
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#8 |
Registered User
Join Date: Dec 2007
Location: Mooresville, NC
Posts: 76
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Re: drive shaft for BBC converson
The only thing you should have changed is the engine mounts... and you probably could have gotten away with using the stock small block mounts.
Big Blocks and Small blocks share the EXACT same distance from the motor mounts to the bellhousing. In other words, the trans should have been left in the stock location. A big block will bolt-in the exact same place a small block comes out, provided there is ample oil pan clearence. |
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#9 | |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: drive shaft for BBC converson
Quote:
It's all a matter of how correct you want to do the installation. I've always done them factory correct details, which causes driveline modification versus a small block truck
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I'm on the Instagram- @Gearhead_Kevin |
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#10 |
Registered User
Join Date: Dec 2007
Location: Mooresville, NC
Posts: 76
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Re: drive shaft for BBC converson
That's good to know, because I will be removing the 292/3spd shortly and replacing it with a 454/Glide.
I know the frame stands are different, but had no idea that GM actually moved the whole works forward as well. Last edited by Yullose; 12-14-2007 at 05:49 PM. |
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#11 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: drive shaft for BBC converson
Just FYI man, those 292 frame stands you have are pretty valuable on the parts board here. A 292 uses a special right side stand that no other GM engine uses, including the other inline six engines.
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I'm on the Instagram- @Gearhead_Kevin |
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#12 | |
Registered User
Join Date: Dec 2007
Location: Mooresville, NC
Posts: 76
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Re: drive shaft for BBC converson
Quote:
![]() That is, assuming we actually have a 292. It's been a LONG time since I've studied those old Chilton books. ![]() Here's a pic of it... maybe you can tell me for sure what it is... I thought the valve covers were different between the 250 and 292 motors... the 292 being wide/flat on the intake side. Dayum... here I go hijacking another thread. (My apologies to the original thread poster) ![]() Last edited by Yullose; 12-14-2007 at 05:49 PM. |
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#13 |
Registered User
![]() Join Date: Aug 2005
Location: Hillsboro Oregon
Posts: 6,449
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Re: drive shaft for BBC converson
If you do the Big Block Motor Mounts on the cheap as posted by TxF himself you might get the wiggle room you need. I followed that FAQ when I installed my 476 and it worked great. Thanks Tx!
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