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rear axle swap and pinion angle

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maverick
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rear axle swap and pinion angle Empty rear axle swap and pinion angle

Post  racinghabbit December 19th 2012, 12:53 pm

79 mustang. took out the little rearend and put in a 8.5 rear end and now the pinion in pointing way to far down...

Any suggestions
thanks
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Post  dfree383 December 19th 2012, 1:10 pm

Get some wedge shims for the perches on the springs.
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Post  maverick December 19th 2012, 5:55 pm

Dave, a '79 isn't a leaf spring deal. I'd think adjustable control arms or relocating the brackets would be the ticket.
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Post  racinghabbit December 20th 2012, 3:19 pm

The rear suspension in trailing arms and coil springs ... the rearend that is in the car now is a 94 gt mustang...

Pinion angle is pionting downward....

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Post  kim December 20th 2012, 3:57 pm

You went too new, the 94 chasis change moved the mounting points, SN95 chasis versus FOX. Adjustable uppers to roll the pinion back up.

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Post  Mustang-junky December 20th 2012, 8:57 pm

kim wrote:You went too new, the 94 chasis change moved the mounting points, SN95 chasis versus FOX. Adjustable uppers to roll the pinion back up.

The mounting points should be the same. The rear axle assembly got wider in 94 although the axle housing was the same. In 99 the housing and the axle assembly got wider.


To the OP, adjustable upper will probably get the pinion angle where you need it. Get the sperical bearing stuff, the poly stuff will bind up.
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Post  zbob December 21st 2012, 12:43 am

fwiw I like the spherical on one end, poly on the other. with both ends spherical it seemed the body rocked side to side. but then I am not normal anyway. bobn

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Post  racinghabbit December 21st 2012, 11:56 am

found out last nite that the rearend is out of a 90 gt.... does that make a difference
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Post  kim December 21st 2012, 2:45 pm

Should bolt right in and be exactly as ford intended it to then.

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Post  dfree383 December 21st 2012, 3:22 pm

maverick wrote:Dave, a '79 isn't a leaf spring deal. I'd think adjustable control arms or relocating the brackets would be the ticket.

I misread that Embarassed I though he had a mustang II.... Sleep
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Post  dfree383 December 21st 2012, 3:23 pm

racinghabbit wrote:found out last nite that the rearend is out of a 90 gt.... does that make a difference

What arms are you using?
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Post  racinghabbit December 24th 2012, 2:01 am

79 upper arms and 90 lowers
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Post  jbozzelle December 24th 2012, 3:20 pm

Factory uppers and lowers?

How far down is the pinion?


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Post  Mustang-junky December 24th 2012, 4:17 pm

You will need some aftermarket arms to adjust the pinion angle. Most people go with adjustable uppers.

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