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How attentive should I be to this? The engine and tranny are in now :rock: and their at about 5-6* down towards the rearend. I also lowered the truck (4-6) and the rearend is 8-10* up towards the tranny. I don't have the cab or bed on the frame just to make it easier, but I didn't know if it would change these angles or not. Oh, did I mention the engine and tranny are in the frame:D
Find you a truck in a parking lot somewhere and measure the angle of the pan and then duplicate it on your truck. Angle is important, supposedly. I don't know how important because rock crawlers run automatics and nearly stand them on the back bumper without issue.
i don't think you're suposed to have no more than a 2* difference between the center line of the yokes. i may be wrong but it sounds like you have a deferential of 13*
Did you put any shims in between the leaf springs and axle to adjust ur pinion angle??? U will need to do that to keep ur pinion angle lined up right after 6"in drop in the rearQuote:
Originally Posted by racermech
yeah, driveshaft angle kills HP but when was the last time you saw the driveshaft angle on a severely lifted 4x4? Those things have scary driveline angles! They'll tilt the rear end to straighten out the pinion angle to the driveshaft but I wonder what happens when they no longer have oil on the bearings since the pinion angle is so pronounced.
I know it look like it would tear it all to pieces, there no way its good for them :eek:Quote:
Originally Posted by RedHeartbeat
I'd set the pinion 3 degrees low to make sure there's no pinion to driveshaft interference. I leveled my motor and tranny out making adjustments to the crossmember and then set the rear drive shaft 3 degrees low. Trust me, if the pinion is too high it'll hit the driveshaft and knock the heads of the bolts off the pinion. Been there, done that! If you get a good bite on the pavement the pinion is going to the sky unless you have some ladder bars, Cal-tracs or a pinion stop. LOL
how exactly do you measure the * prolly something ill wana know for my swap since i have a 4/6 drop aswell
I've done this by positioning the trans & pinion yokes such that the side of each yoke is parallel to the ground (to use somewhat of a flat surface). Placing the angle finder on the yokes will show you an angle measurement. Mine are within 1 degree of each other (4 & 5 degrees - trans & pinion respectively).Quote:
Originally Posted by Wtfan18
One of the reasons for me asking this is because of the conflicting local information. As far as my rearend angle, I know that's off just by looking at it. But that's understandable due to the 6" drop. This link to s&p is what really got me thinking Driveline Angles . Also, I don't have the cab or bed attached right now, so that will change my engine tranny angle for sure... atleast a little bit. If it doesn't change enough, I was going to do what NITROUS spoke of and put shims/washers under the crossmember. BTW, thanks NITROUS for the help with that a/c idea, it came out great!
needs to be between 1 and 3 degrees, if you drew a straight line between the tran tail shaft and the rear end pinion, if your rear end was 3 degrees up you trans should be between between 0 and 6 degrees down, it has to have some angle or the u-joints will wear out to quick, found this out the hard way, set a 33 coupe up with the angles the same, u-joints didnt last any time.
Eon on extreme4x4 talked about you MUST have some conflict difference between the driveshaft and pinion angle, exactly what you said is what he said on the show. They even explained the position of the pumpkin is offset from the centerline of the transfer case for that exact reason. You got someone backing you up there that is famous Tulsa. :thumb:
thats a first, but built enough of these old cars, so makes it a lot easier when dealing with the pickupsQuote:
Originally Posted by RedHeartbeat
Racermech, Good deal on the A/C, I can't remember what I told you though. LOL
Tulsa and Red I remember that xtreme 4x4 show about the offsets. Nitrous, I was talking about the frame notch for stock ls1 a/c placement.
Nitrous.... Would you happen to remember that P/N & vendor you purchased that compressor adapter from? I was looking for the PM you sent, but couldn't find it. PM me again if you still have it.