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03-21-2004, 08:07 PM | #1 |
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Who Knows The Correct Answer??
On a 67-72 pickup with a two piece driveshaft, is it OK for the rear half shaft to be off center when driving?
Is it more important to have the rear centered, (tires equally spaced in relation to sheetmetal), or, drive shafts in a perfect straight line at drive height? Who knows the answer???? Thanks, 72longbed |
03-21-2004, 09:06 PM | #2 |
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Since the pinion is offset to the right by approximately 1" the driveshaft is not centered at the rear end. This is true of all trucks
with the 12 bolt rear ends. Not sure on the others, but I would suspect it. Jim |
03-21-2004, 09:13 PM | #3 |
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Just checked and jim is right both my blazer and 72 have the shaft off center... Should not create a problem if the shaft is ballanced correctly
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03-21-2004, 11:02 PM | #4 |
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The shaft should never be in a straight line on anything or the universal joints wouldn't do their job correctly.
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03-21-2004, 11:10 PM | #5 |
Now the others dig........
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sorry to butt in
how about on a one peice.
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03-21-2004, 11:21 PM | #6 |
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Same with a one piece. The pinions were offset on all rear wheel drive cars for this reason.
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03-22-2004, 12:17 AM | #7 |
its all about the +6 inches
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Not to mention that your rear will move from side to side a little bit as the rear bounces. Look at the pan hard bar and visualize the rear squatting. (Talking coil spring trucks here) The rear has to move side to side.
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03-22-2004, 12:02 PM | #8 |
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Thanks ALL!!
Thanks to all for the input!
Since my truck has a later year, (1974) 14 Bolt full floater, the offset is exaggerated by the unequal axle length that a 14 Bolt has. So I've been checking every measurement to make sure It's not self-destructing the driveline when riding along. So I guess I'll go back to centering the WHEELS under the truck at ride height rather than having a perfectly straight driveshaft. (Luckily I installed an adjustable panhard bar.) It does look kinda' funny right now with the rear pushed over to the drivers side about 1". Thanks again, 72longbed |
03-22-2004, 01:21 PM | #9 |
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good to know, I put a 9" under my truck and centered the wheels and the driveline was off center by 1" to the right, had me comcerned. All is well again.
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03-22-2004, 01:51 PM | #10 |
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4 Wheel Disks
Craz,
I noticed you have a four wheel disk setup under your truck, how do you like it? Did you have to use a second proportioning valve or was the stock valve enough? What type of E-brake setup did you go with? Thanks, 72longbed |
03-22-2004, 02:12 PM | #11 |
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My truck isnt on the road yet still in bodywork stages. I used the lincoln rear with factory discs and e-brakes it had the 5 on 5 lug bolt pattern and was only 1" wider overall. I bought a truck power booster,corvette macter cylinder and prop valve new from CPP all setup for 4wheel discs (it comes as a kit). I also bought their e-brake cables.
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70 chev c10 swb fleet 72 grill, sb 400, 2/4 drop. 68 chev c10 swb fleet Early classic 4/6 drop with 4wheel disc brakes 9"rear 67-8 buckets tilt and A/C Classic GM Truck Club of Washington . |
03-22-2004, 02:23 PM | #12 |
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as stated ofset in the driveshaft is normal the critical thing to be checking for proper operation is your pinion angle and tranny output shaft angle must be the same
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03-22-2004, 03:01 PM | #13 |
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cdowns
cdowns,
are those two angles still as critical when you have a fixed carrier bearing between the two? 72 |
03-22-2004, 05:51 PM | #14 |
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yes the 2 angels should be very close to the same for good operation of the u-joints
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