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12-02-2015, 06:45 AM | #1 |
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Join Date: Feb 2010
Location: gresham oregon
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Transmission angle help
I have 700r4 that I am putting behind a 327.can anyone tell me what degree of angle the rear tail shaft should be at up or down,have heard about 4 or 5 but not sure on whether its up or down. I also here if you set the trans tailshaft at 4 or 5 down and set the rear at 4 or 5 degree up
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12-02-2015, 08:33 AM | #2 |
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Join Date: Mar 2012
Location: Lakes Region NH
Posts: 3,200
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Re: Transmission angle help
Degree up or down of tailshaft will depend on how the suspension sits and how the engine is mounted. The goal is to get the carb mounting flange level when the truck is parked unloaded. If you have EFI then you have more flexibility, especially port injection.
You also want to consider the U-joint angle when setting up the engine. Optimum U-joint angle is 2-4 degrees. Maximum generally recommended by driveline manufacturers is 7 degrees. It helps me to make drawings during this stage. |
12-02-2015, 09:11 AM | #3 |
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Join Date: Sep 2005
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Re: Transmission angle help
Pics make it easier here you go
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12-02-2015, 11:13 AM | #4 |
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Re: Transmission angle help
check out this video. it explains a few things. usually driveline angle is set up for 3 degrees, but like mentioned, has to match front and rear. just copy and paste this into google.
http://www.macsmotorcitygarage.com/2...e-and-phasing/ |
12-02-2015, 11:16 AM | #5 |
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Re: Transmission angle help
^^^^^
Yep. Failure to match driveline angles often results in some dramatically broken stuff. |
12-02-2015, 01:48 PM | #6 | |
Hollister Road Co.
Join Date: Apr 2005
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Re: Transmission angle help
Quote:
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12-02-2015, 01:59 PM | #7 |
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Location: Idaho
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Re: Transmission angle help
Universal joints need some angle to operate efficiently. They also need to be phased correctly.
http://www.behlingracing.com/behling...-installation/
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1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project |
12-02-2015, 11:10 PM | #8 |
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Join Date: Mar 2013
Location: Mesquite,Tx
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Re: Transmission angle help
Depends also on what your running out back , leafs springs, or 4 link ,ladder bars
http://www.quickperformance.com/Pini...ent_ep_45.html http://www.hotrod.com/how-to/paint-body/91758/ leaf springs 5-7* static angle , under power the rear will rotate up no limits video shows the same and also CPP tech page 271 in their catalog At work I've set the drive shaft angle of diesel and electric AC- fire pumps for oil rigs high rises ect. for 10years.The instruction are very clear to have 3* of angle on the drive shafts for the u joints to function properly. They are rigidly bolted down with no movement to very stout I-beam frames. Last edited by 1958Warrior; 12-02-2015 at 11:24 PM. |
12-03-2015, 08:48 AM | #9 |
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Join Date: Dec 2002
Location: Cactus Patch So. Az
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Re: Transmission angle help
My driveshaft shop tells me that I must have AT LEAST one degree difference from front to back to let the U-joints function, so take your pick!
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12-03-2015, 10:01 AM | #10 |
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Re: Transmission angle help
GM trucks, at least the 88-99 style, had maybe 1 degree angle across the front driveshaft. The differential never moves as it's IFS. The U-joints brinnel because the rollers basically keep moving back and forth in a very, very small area. Increasing the driveshaft angle slightly can eliminate or greatly reduce this problem.
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12-03-2015, 11:45 AM | #11 |
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Join Date: May 2007
Location: Doodah Kansas
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Re: Transmission angle help
everything has been said except,
the added angle doesnt have to be in the xy plane. most rear differentials have the pinion offset so it doesnt point straight at the trans and the u joint working angle is found here. most chevrolets use a 4 degree down at the trans, so they need a 4 degree up at the diff. this is also why your trans empties itself completely when you pull the yoke. (not really, just YOKEing around)
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12-03-2015, 01:04 PM | #12 | |
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Location: Morada, CA --- (Near Lodi)
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Re: Transmission angle help
Quote:
But that has nothing to do with setting 'pinion angle'. Setting pinion angle does require some more understanding of your rear suspension system and everything involved with it. The stuff put up by 1958Warrior is pretty good. check it out.
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12-03-2015, 02:37 PM | #13 |
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Re: Transmission angle help
All good info in these posts. Good reasoning too.
Dave and 1projecttoomany hit on the primary thing with setting the trans angle. Set the engine and trans up with the carb base of the intake sitting level and then go from there getting your driveshaft angles after the engine and trans are set in place.
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12-03-2015, 08:04 PM | #14 |
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Location: Idaho
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Re: Transmission angle help
I did not post this before because it is way overkill. But if you are interested in the physics here is a great book made for driveline shops and those fabricating from scratch.
http://www2.dana.com/pdf/J3311-1-HVTSS.PDF
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1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project |
12-04-2015, 12:59 PM | #15 | |
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Join Date: Feb 2015
Location: Yulee, Florida
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Re: Transmission angle help
Quote:
Thanks for posting that...I was wondering about angles when I swap my eaton for the 14 bolt. The 1 ton has a center bearing and I didn't have a clue what to do there. The book covers it. I even kinda understand it. Larry W. |
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