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03-22-2011, 04:42 PM
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#1 |
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Registered User
Join Date: Jul 2010
Location: Bancroft, ontario
Posts: 555
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pinion angle question
hello all,i am installing a 4/6 drop on my 66 and was wondering if someone might know what degree shims i would need for the rear end to correct the driveline angle?also can you purchase these or do you have to fab them?thanks for any help!
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03-22-2011, 04:58 PM
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#2 |
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Registered User
Join Date: Mar 2011
Location: Arizona
Posts: 124
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Re: pinion angle question
I believe you need 3 to 5 degree shim
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03-22-2011, 05:24 PM
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#3 |
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Registered User
Join Date: Jul 2010
Location: Bancroft, ontario
Posts: 555
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Re: pinion angle question
thanks jsm,do you know if you can purchase these?i havn't seen them??
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03-22-2011, 06:49 PM
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#4 |
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Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,068
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Re: pinion angle question
Try it before buying shims. Truck arm or leafs suspension?
I've done multiple truck-arm trucks w/more than 6" rear drops & did not adjust the pinion angle. None had issues. This is one of those items where it's easy enough to do after if necessary vs. spending time/money up front when it's possibly not required.
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. Last edited by SCOTI; 03-22-2011 at 06:49 PM. |
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03-22-2011, 07:03 PM
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#5 |
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Registered User
Join Date: Mar 2011
Location: Arizona
Posts: 124
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Re: pinion angle question
summit racing has them for 16 bucks plus shipping. my truck needed them due to the drop and engine and trans setup I have.
I would do it its cheap insurance |
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03-22-2011, 07:52 PM
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#6 |
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Registered User
Join Date: Jul 2010
Location: Bancroft, ontario
Posts: 555
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Re: pinion angle question
it has coil springs,i hear you,makes sense to wait and see if i need them and summit has them.thanks guys i appreciate your help!
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03-23-2011, 06:27 AM
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#7 |
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Senior Member
 
Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: pinion angle question
I bagged the back of mine for a bout the same drop as you are doing or just a little more and the pinion angle was fine.
Jimmy
__________________
60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
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03-23-2011, 06:44 PM
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#8 | |
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Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,068
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Re: pinion angle question
Quote:
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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03-24-2011, 01:23 PM
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#9 |
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Registered User
Join Date: Aug 2010
Location: Redding California
Posts: 72
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Re: pinion angle question
I couldnt find anything on the summit site the other day. I did find some interesting things at speedwaymotors.com that I couldnt find anywhere else.
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1970 C10 swb 350 4spd under construction |
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03-25-2011, 02:17 AM
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#10 |
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Registered User
Join Date: Apr 2010
Location: las vegas
Posts: 299
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Re: pinion angle question
what is the rule of thumb for this..i was looking at mine which i recently jsut lowered about 6 inches id say..the angle looks a lil steep and i was thinking the same thing..a buddy of mine dropped his 62 pretty low and said he had some binding due to a steep angle. mine sounds fine driving but i dont want to have anything serious happen...im very new to all of this as it is.
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04-01-2011, 01:30 AM
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#11 |
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Registered User
Join Date: Sep 2003
Location: DFW
Posts: 765
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Re: pinion angle question
the angle between the output of trans to driveshaft for a street driven truck should be between 1-3 deg and like wise 1-3 deg at the driveshaft to pinion thereby canceling each other out.
in other words if the output shaft of the trans is neg (angled down) 3 deg then the pinion should be set at 3 deg positive (or angled up) they should be operating in parallel planes. likewise the angle of the driveshaft to pinion and output shaft should not exceed 3deg or faster wear is very possible. all theseare for a street driven vehicle and should be set at ride height. check out this info from Streetrodder mag, the pictures give a good description http://www.streetrodderweb.com/tech/...les/index.html Last edited by Rooster's 67; 04-01-2011 at 01:44 AM. Reason: mag link for better explanation |
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04-01-2011, 11:50 AM
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#12 |
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Registered User
Join Date: Jul 2010
Location: Bancroft, ontario
Posts: 555
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Re: pinion angle question
great info roosters 67.thanks very much!
 
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04-01-2011, 12:09 PM
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#13 |
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Registered User
Join Date: Sep 2003
Location: DFW
Posts: 765
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Re: pinion angle question
oldtrux,
hey no problem, I just like to spread good correct and precise info so everyone can learn and make good wise choises. But like Scoti said, you may not have any noticeable issues with just lowering if you have truck arms, you may still have "bad angles" with what might be accelerated wear though. |
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