Pinion angle
Thread Starter
Staging Lane
Joined: Jul 2008
Posts: 72
Likes: 1
Pinion angle Doing a 2007 a classic 5.3/4L60E swap into my 1948 Chevy pickup. Engine/ transmission down angle measured at 4 degrees down with full weight on suspension. Is 4 degrees up on on pinion acceptable?
yes and no....the angles have to be the same and opposite....just like you have.
But the driveshaft has to be within a certain spec too. Measure on all 4 wheels, you need the diff, engine, and driveshaft angles.
But the driveshaft has to be within a certain spec too. Measure on all 4 wheels, you need the diff, engine, and driveshaft angles.
TECH Regular
Joined: Dec 2014
Posts: 484
Likes: 18
From: Emory Texas currently
I agree with this but I also know from experience ive had it anywhere from 0. Up to about 3.5 or 4 i use my angle finder to start then ill switch to my digital setup when I'm setting it up permanently I've had it move a little from welding on perches and it didn't have a drastic effect on it but I'd still want it as close as I could get it
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The front and rear operating angles need to be equal, opposite, and as small as possible but not zero. Depending on the rear suspension the rear operating angle might need to be set lower to compensate for axle wrap, but this depends largely on the rear suspension design and the bushings being used. Rear ride height also plays a big role in all this.
Andrew
The angle of the trany is irrelevant. You just don't want the driveshaft straight with the U-joints. They need to be at an angle. Yes, the rear suspension dictates the optimum angles. Of course none of our race cars had leaf springs. The theory is still the same. Pinion angle is set as needed that at launch the squat of the rear suspension gets the pinion angle to where it needs to be during a run. in a leaf spring car this is always down. And unless this is a real track only race vehicle, I wouldn't over complicate it. If a person is that serious then we should talk about location of brake calipers too. Yes it matters.
Statements like this are meaningless unless you measure the angle of the driveshaft.
The front and rear operating angles need to be equal, opposite, and as small as possible but not zero. Depending on the rear suspension the rear operating angle might need to be set lower to compensate for axle wrap, but this depends largely on the rear suspension design and the bushings being used. Rear ride height also plays a big role in all this.
Andrew
The front and rear operating angles need to be equal, opposite, and as small as possible but not zero. Depending on the rear suspension the rear operating angle might need to be set lower to compensate for axle wrap, but this depends largely on the rear suspension design and the bushings being used. Rear ride height also plays a big role in all this.
Andrew
To simplify what was hashed out here;
Measure engine and trans, and the axle should be about 2-3* less than what the engine measures. So if the engine is measuring 4* downward, the rear should be up 1-2* to allow for axle wrap. That way under load they will be close to the same angle
Measure engine and trans, and the axle should be about 2-3* less than what the engine measures. So if the engine is measuring 4* downward, the rear should be up 1-2* to allow for axle wrap. That way under load they will be close to the same angle
__________________
Glenn ***
Sales Tech
www.bmrsuspension.com
813.986.9302
Find a Quality alignment shop near you!
Glenn ***
Sales Tech
www.bmrsuspension.com
813.986.9302
Find a Quality alignment shop near you!
I'm guessing since this is a 48 pickup, it will be street drive, not race only.
Instead of asking peoples opinions, go to the experts, follow their advice:
http://www2.dana.com/pdf/J3311-1-HVTSS.PDF
Instead of asking peoples opinions, go to the experts, follow their advice:
http://www2.dana.com/pdf/J3311-1-HVTSS.PDF