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Old 11-21-2013, 09:49 AM   #1
flathead4rd
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Default Trans & Pinion angle.

I need to know the transmission & pinion angle on stock 49 to 51 Fords.
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Old 11-21-2013, 10:01 AM   #2
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Default Re: Trans & Pinion angle.

The transmission and pinion should be parallel, but since pinion is lower the driveshaft will be on an angle assuring proper u-joint operation. Same holds true if you swap an engine or rear end. From your avatar photo it looks like car has lowering blocks so you may not have enough angle on the joints.
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Old 11-21-2013, 10:07 AM   #3
V8 Bob
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Default Re: Trans & Pinion angle.

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Originally Posted by flathead4rd View Post
I need to know the transmission & pinion angle on stock 49 to 51 Fords.

I do not have any written documentation or diagrams showing stock drive line specs, but based on the fact the intake carb pad is angled 3 degrees forward starting with '49 Fords and Mercs with open drive lines, 3 degrees should be close to or the actual trans and pinion angles.
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Old 11-21-2013, 03:18 PM   #4
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Default Re: Trans & Pinion angle.

Yes, several manufactures of suspension components suggest 3/4 degrees for stock installations. I'm at present installing a Jeep Cherokee rear axle in my truck and it at 3 degrees. However I may have to raise the front of the engine for streering clearance, so that's not final.
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Old 11-21-2013, 03:46 PM   #5
flathead4rd
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Default Re: Trans & Pinion angle.

Thanks for the replies. At present the tail shaft on my T-5 trans (on an 8-BA flathead) is six degrees down and the Maverick 8 inch rear is six degrees up making the two parallel. I'm thinking they both should be closer to 3 degrees or less. I have a bad vibration at about 2000 RPM's in any gear. Does that sound right?
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Old 11-21-2013, 03:55 PM   #6
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Default Re: Trans & Pinion angle.

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No, it doesn't sound right.

If you had a vibe at a certain road speed, then that could be due to driveshaft balance or phasing or angular misalignment. But you have a vibe at 2000 rpm in all gears. Think about it. The problem lies with engine, flywheel, clutch or maybe an accessory driven off the crank. Something forward of the transmission, anyway.

Mart.
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Old 11-21-2013, 04:58 PM   #7
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Default Re: Trans & Pinion angle.

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Originally Posted by flathead4rd View Post
Thanks for the replies. At present the tail shaft on my T-5 trans (on an 8-BA flathead) is six degrees down and the Maverick 8 inch rear is six degrees up making the two parallel. I'm thinking they both should be closer to 3 degrees or less. I have a bad vibration at about 2000 RPM's in any gear. Does that sound right?

The U-joint's "working angle" is much more important than actual engine/pinion angles. I'm betting you have well over 3 degree working angles with the trans and pinions setting at 6 degrees.
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Old 11-21-2013, 05:15 PM   #8
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Default Re: Trans & Pinion angle.

Transmission tail shaft and pinion should be parallel with each other. Driveshaft should be at some angle to them both which, I believe should be 3 degrees or more. This is to ensure that the rollers in the U joint actually roll, distributing the load and not sit in the same position, beating themselves into the cups or "X" pieces.
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Old 11-21-2013, 05:36 PM   #9
V8 Bob
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Default Re: Trans & Pinion angle.

The maximum working angle for single cardan U-joints is 3 degrees, and minimum should be 1 degree.
The engine/trans angle should be parallel or within one degree of the pinion angle.
Some time spent looking over the link below should clarify drive shaft and U-joint design and setup.


http://www2.dana.com/pdf/J3311-1-DSSP.pdf
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Old 11-21-2013, 06:24 PM   #10
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Default Re: Trans & Pinion angle.

The point, regardless of his angles, as Mart pointed out, that's not what is causing his problem at 2K RPMs in every gear.

Question to the OP, does the engine vibrate at 2K in nuetral?
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Old 11-22-2013, 04:59 PM   #11
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Default Re: Trans & Pinion angle.

Mike B. Yes it does but it seems to be getting worse. I had the flywheel and pressure plate balance before original installation and it seemed to be OK but after about a thousand miles it is progressivly getting more noticable. I was told it might be a misalignment of the trans input shaft causing the bushing/bearing to go bad. Am going to pull the trans to see if anything stands out that could be the cause. Thanks again for your and everyone else's help. John PS: At age 74 this climbing in and out from under the car takes a lot longer than it used to. LOL
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Old 11-22-2013, 06:28 PM   #12
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Default Re: Trans & Pinion angle.

Mart's words are wise. If you have no knocking sound (pressure plate/flywheel), I'd take a close look at the fan. PeteVS had good words of wisdom for driveline setup too. Three degrees + to keep the needle bearings moving and lubed.

Lonnie
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Old 11-22-2013, 06:34 PM   #13
Mike B
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Default Re: Trans & Pinion angle.

Hey...at 52 it's a chore as well

Who's adapter did you use for the T5?

Also, did you use the proper pilot bearing/bushing?

You'll know about the input bear on the tranny soon enough once you pull it, but other things to check as well before reinstalling it..make sure the adapter is clocked correctly as well.

Yes, as mentioned above, take the fan belts off and check again before pulling the trans...eliminate everything first the easy way...a minute of running the engine with no belts attached will not hurt anything.
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Old 11-22-2013, 07:09 PM   #14
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Default Re: Trans & Pinion angle.

5 Degree
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