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 Post subject: Correct pinion angle
PostPosted: Thu Oct 22, 2009 7:53 pm 
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Joined: Wed Oct 23, 2002 7:57 pm
Posts: 9132
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Is there a way to set the pinion angle without the Transmission and driveline not in the car? I am going to mount my narrowed 8 3/4 rear this weekend and would like to tack the spring perches in place, but the engine and transmission are not in the car and won't be for a while. Can I set the angle in relationship to the rocker panel or some other landmark? Or do I have to wait until everything else is in place. I see conflicting measurements on the correct angle and how to measure it. Any help would be appreciated.

This car is a 65 Valiant race car, with 4-speed transmission.


Rick


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 Post subject: Re: Correct pinion angle
PostPosted: Thu Oct 22, 2009 9:19 pm 
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Quote:
Can I set the angle in relationship to the rocker panel or some other landmark?
No. You have to wait til the engine, trans, and driveline are installed.
Quote:
I see conflicting measurements on the correct angle and how to measure it.
The FSM contains a good procedure.

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 Post subject:
PostPosted: Fri Oct 23, 2009 7:15 am 
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Rick
I feel for you I once tried it with the engine and trans "just sitting in there" but not bolted tight. I was OFF by a mile.
Frank

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 Post subject: Thanks
PostPosted: Fri Oct 23, 2009 2:26 pm 
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Joined: Wed Oct 23, 2002 7:57 pm
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Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Not big deal. I'll bolt it in without welding the perches on (or maybe one small tack) and then I will be able to set it on the ground and move it around. I'm seeing pinion angles of between 4 & 8 or more. Is one end of the spectrum better fopr a race car setup than the other? Sorry Dan I don't have a FSM. That will be on my wish list for Christmas. :)

Thanks,
Rick


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 Post subject:
PostPosted: Sat Oct 24, 2009 7:34 am 
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Rick
I just think that the angle needs to be correct for your setup more than what angle your running.
IMHO
Frank

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 Post subject:
PostPosted: Sat Oct 24, 2009 3:22 pm 
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Joined: Thu Oct 17, 2002 7:27 pm
Posts: 14773
Location: Park Forest, Illinoisy
Car Model: 68 Valiant
8* down was usually reserved for a really fast leaf spring 4 speed car. Most milder setups will live long and happy with 2-3* down.

My Valiant was happy with 0*. :shock:

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 Post subject: -
PostPosted: Sun Oct 25, 2009 6:36 pm 
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Joined: Sat Aug 09, 2008 5:01 pm
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Location: Taneytown, MD
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I agree with slantzilla,4-8 degrees is for full race cars,anything more than 2-3 degrees will cause the driveshaft to hum on the street.

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 Post subject: Thanks
PostPosted: Tue Oct 27, 2009 1:32 pm 
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Board Sponsor & SL6 Racer

Joined: Wed Oct 23, 2002 7:57 pm
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Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
It looks like I'll shoot for 2-3 degrees down. I just didn't know if a 4-speed and slicks would change the angle needed.

Thanks for the info, Rick


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