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pinion angle again #671135 04/15/10 10:16 PM 04/15/10 10:16 PM
Joined: Mar 2004 Posts: 878 hudson valley n.y. G GEORGE68HEMIRR OP super street
GEORGE68HEMIRR OP super street G Joined: Mar 2004 Posts: 878 hudson valley n.y.	maybe somebody can help me..please..heres what i have.....with the car jacked up and sitting on 5 blocks under each wheel with the car on the suspension .....drive shaft out and measuring the angles of the trans is -4 and pinion is plus 4.....so what i am thinking is i am at 0 ...right.....with the driveshaft in and measuring angles at top of shaft its plus 1 and by the pinion on the shaft its plus 1....so thats zero ...right.....so i need 5 to 7 degrees down....right......so what do i do to get 5 to 7 degrees down..nose down the rear??5 to 7degrees??....i lowered the 727 to make room for the carbon fiber trans shield and i just installed a gear vendors overdrive which is why the trans is minus 4 degrees

Re: pinion angle again [Re: GEORGE68HEMIRR] #671136 04/15/10 10:35 PM 04/15/10 10:35 PM
Joined: Jul 2005 Posts: 1,472 Overland Park, KS. J Joshs68 pro stock
Joshs68 pro stock J Joined: Jul 2005 Posts: 1,472 Overland Park, KS.	Thats how I measured mine, crank centerline was 3* down, pinion was 3* up . I called that zero. If those angles are the same the drivshaft angles will be equal but opposite. I installed a shim under my rear pads to drop the angle of the rear to -1* down or -4* total. I think its correct. It made my driveline vibration go away completly and took care of any spring wrapup. hope that help Im not a pro but that what I did.

Re: pinion angle again [Re: Joshs68] #671137 04/15/10 10:44 PM 04/15/10 10:44 PM
Joined: Mar 2004 Posts: 878 hudson valley n.y. G GEORGE68HEMIRR OP super street
GEORGE68HEMIRR OP super street G Joined: Mar 2004 Posts: 878 hudson valley n.y.	thanks josh....i have shims but was thinking of replacing and welding in new spring perches..have them too...just confused and trying to figure this out

Re: pinion angle again [Re: GEORGE68HEMIRR] #671138 04/15/10 10:58 PM 04/15/10 10:58 PM
Joined: Mar 2004 Posts: 878 hudson valley n.y. G GEORGE68HEMIRR OP super street
GEORGE68HEMIRR OP super street G Joined: Mar 2004 Posts: 878 hudson valley n.y.	i didnt tell you its a 68 roadrunner/dana 60 with ss springs/mark williams driveshaft if this helps....thanks

Re: pinion angle again [Re: GEORGE68HEMIRR] #671139 04/15/10 11:44 PM 04/15/10 11:44 PM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	shims or cut the mounts and re-weld. either will work. just be careful with the welding, don't want to warp an axle tube. as far as how much angle on the pinion you need...I've learned that there is no magic number after reading everything online. some will say 3-4 degrees, others say 5-7. some will say whatever it takes to get 0 degrees under WOT with spring wrap up at it's max. do you have a vibration now? I'd say drive it, see how it feels, and adjust as needed from there. Photobucket sucks

Re: pinion angle again [Re: GEORGE68HEMIRR] #671140 04/15/10 11:44 PM 04/15/10 11:44 PM
Joined: Aug 2003 Posts: 43,207 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,207 Bend,OR USA	Quote: thanks josh....i have shims but was thinking of replacing and welding in new spring perches..have them too...just confused and trying to figure this out Best bet is to remove and replace the spring pads,reposition the rear end housing with the pinion nose down to what angle you want and tack weld it in place. Remove it for the final welds, you might want to think about placing a strap, 3/16 to 1/4 thick by one inch wide,across the rear end housing from the ends of the spring perches to the other end as a brace, like a V. Forget the adpater shims Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: pinion angle again [Re: 70Cuda383] #671141 04/16/10 12:29 AM 04/16/10 12:29 AM
Joined: Mar 2004 Posts: 878 hudson valley n.y. G GEORGE68HEMIRR OP super street
GEORGE68HEMIRR OP super street G Joined: Mar 2004 Posts: 878 hudson valley n.y.	Quote: shims or cut the mounts and re-weld. either will work. just be careful with the welding, don't want to warp an axle tube. as far as how much angle on the pinion you need...I've learned that there is no magic number after reading everything online. some will say 3-4 degrees, others say 5-7. some will say whatever it takes to get 0 degrees under WOT with spring wrap up at it's max. do you have a vibration now? I'd say drive it, see how it feels, and adjust as needed from there. well i guess i am at i think plus 3 so if i nose down the pinion minus 9 degrees that would set me at minus 6....would this be the right way of doing this i havent driven the car yet because i just installed the gear vendors overdrive and i ordered a shorter driveshaft .....i am just trying to get this set right.....its mostly a street car but it does see the strip 4-5 times a year.....i usually set the pinion snubber 1 inch from the floor

Re: pinion angle again [Re: Cab_Burge] #671142 04/16/10 12:36 AM 04/16/10 12:36 AM
Joined: Mar 2004 Posts: 878 hudson valley n.y. G GEORGE68HEMIRR OP super street
GEORGE68HEMIRR OP super street G Joined: Mar 2004 Posts: 878 hudson valley n.y.	Quote: Quote: thanks josh....i have shims but was thinking of replacing and welding in new spring perches..have them too...just confused and trying to figure this out Best bet is to remove and replace the spring pads,reposition the rear end housing with the pinion nose down to what angle you want and tack weld it in place. Remove it for the final welds, you might want to think about placing a strap, 3/16 to 1/4 thick by one inch wide,across the rear end housing from the ends of the spring perches to the other end as a brace, like a V. Forget the adpater shims these danas are pretty bullet proof right?you really think i need a brace?....what happens with the cover? do you think i should nose down the pinion minus 9 degrees to get it to minus 6?

Re: pinion angle again [Re: GEORGE68HEMIRR] #671143 04/16/10 08:14 AM 04/16/10 08:14 AM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	If the pinion centerline is parallel to the transmission centerline, install a pair of 3 degree angled wedges, or cut he perches off and roll the pinion downward 3 degrees. This will yield a true, 3 dgree negative pinion angle. Contact info

Re: pinion angle again [Re: Cab_Burge] #671144 04/16/10 08:15 AM 04/16/10 08:15 AM
Joined: Feb 2007 Posts: 6,295 U.S. M moparniac master
moparniac master M Joined: Feb 2007 Posts: 6,295 U.S.	Quote: Best bet is to remove and replace the spring pads,reposition the rear end housing with the pinion nose down to what angle you want and tack weld it in place. Remove it for the final welds this is what I did and I boxed my perches in! Mopar Performance

Re: pinion angle again [Re: DoctorDiff] #671145 04/16/10 09:15 AM 04/16/10 09:15 AM
Joined: Mar 2004 Posts: 878 hudson valley n.y. G GEORGE68HEMIRR OP super street
GEORGE68HEMIRR OP super street G Joined: Mar 2004 Posts: 878 hudson valley n.y.	thanks guys for all your help

Re: pinion angle again [Re: GEORGE68HEMIRR] #671146 04/16/10 09:29 AM 04/16/10 09:29 AM
Joined: Jun 2009 Posts: 705 Michigan H Hemiroid super stock
Hemiroid super stock H Joined: Jun 2009 Posts: 705 Michigan	Quote: these danas are pretty bullet proof right?you really think i need a brace?....what happens with the cover? do you think i should nose down the pinion minus 9 degrees to get it to minus 6? He was talking about adding a piece of flatstock that is wrapped around the axle tube in a "u" shape to support the ends of the perches.

Re: pinion angle again [Re: Hemiroid] #671147 04/16/10 10:27 AM 04/16/10 10:27 AM
Joined: Mar 2004 Posts: 878 hudson valley n.y. G GEORGE68HEMIRR OP super street
GEORGE68HEMIRR OP super street G Joined: Mar 2004 Posts: 878 hudson valley n.y.	Quote: Quote: these danas are pretty bullet proof right?you really think i need a brace?....what happens with the cover? do you think i should nose down the pinion minus 9 degrees to get it to minus 6? He was talking about adding a piece of flatstock that is wrapped around the axle tube in a "u" shape to support the ends of the perches. thats a good idea....now thats clear....thanks

Re: pinion angle again [Re: GEORGE68HEMIRR] #671148 04/16/10 02:32 PM 04/16/10 02:32 PM
Joined: Jul 2005 Posts: 1,472 Overland Park, KS. J Joshs68 pro stock
Joshs68 pro stock J Joined: Jul 2005 Posts: 1,472 Overland Park, KS.	Quote: Quote: shims or cut the mounts and re-weld. either will work. just be careful with the welding, don't want to warp an axle tube. as far as how much angle on the pinion you need...I've learned that there is no magic number after reading everything online. some will say 3-4 degrees, others say 5-7. some will say whatever it takes to get 0 degrees under WOT with spring wrap up at it's max. do you have a vibration now? I'd say drive it, see how it feels, and adjust as needed from there. well i guess i am at i think plus 3 so if i nose down the pinion minus 9 degrees that would set me at minus 6....would this be the right way of doing this i havent driven the car yet because i just installed the gear vendors overdrive and i ordered a shorter driveshaft .....i am just trying to get this set right.....its mostly a street car but it does see the strip 4-5 times a year.....i usually set the pinion snubber 1 inch from the floor if you are at plus 3* now and that is parallel with the crank center line then consider that zero. so if you shim for zero on your gauge then that would be 3* down

Re: pinion angle again [Re: Joshs68] #671149 04/16/10 03:48 PM 04/16/10 03:48 PM
Joined: Mar 2004 Posts: 878 hudson valley n.y. G GEORGE68HEMIRR OP super street
GEORGE68HEMIRR OP super street G Joined: Mar 2004 Posts: 878 hudson valley n.y.	Quote: Quote: Quote: shims or cut the mounts and re-weld. either will work. just be careful with the welding, don't want to warp an axle tube. as far as how much angle on the pinion you need...I've learned that there is no magic number after reading everything online. some will say 3-4 degrees, others say 5-7. some will say whatever it takes to get 0 degrees under WOT with spring wrap up at it's max. do you have a vibration now? I'd say drive it, see how it feels, and adjust as needed from there. well i guess i am at i think plus 3 so if i nose down the pinion minus 9 degrees that would set me at minus 6....would this be the right way of doing this i havent driven the car yet because i just installed the gear vendors overdrive and i ordered a shorter driveshaft .....i am just trying to get this set right.....its mostly a street car but it does see the strip 4-5 times a year.....i usually set the pinion snubber 1 inch from the floor if you are at plus 3* now and that is parallel with the crank center line then consider that zero. so if you shim for zero on your gauge then that would be 3* down well i went for the #3 shim....so now i have plus one at the pinion and minus 4 at the trans.so now i have minus 3....that should work.....i want to thank all of you that help me Last edited by GEORGE68HEMIRR; 04/16/10 03:50 PM.

Re: pinion angle again [Re: GEORGE68HEMIRR] #671150 04/25/10 08:18 PM 04/25/10 08:18 PM
Joined: Mar 2004 Posts: 878 hudson valley n.y. G GEORGE68HEMIRR OP super street
GEORGE68HEMIRR OP super street G Joined: Mar 2004 Posts: 878 hudson valley n.y.	WELL NOW I HAVE A VIBRATION AROUND 45-50 MPH....do i lower the pinion more??

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