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Old 02-20-2011, 10:33 AM
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Pinion angle, modded '68 Mustang

The 393 stroker and T5 in my '68 Mustang are angled down (towards the rear) at 5. This is as high as I can get the tailshaft under the trans tunnel due to the slightly increased height of the T5.
The Currie 9" rear, a new custom rearend, sits on stock Eaton GT springs with no blocks or modifications. The pinion points downwards at -2 towards the front. This is clearly not great, so I tried some wedges under the spring perches to help. I got the pinion up to +4 with some 6 wedges, but they raised the rear too much and it fouled the wheelarches and exhaust on full travel.
So I have a pair of new perches from Currie, and am about to cut off the old ones (one at a time, after some very careful measurements) and weld the new ones on to give me a pinion angle of +4.5, giving a little allowance for torque reaction.
This mod will leave the driveshaft at nearly horizontal, maybe going a little negative when the car is loaded. Anybody see any problems with this - I'd be very grateful for thoughts?
Car is for street use only, no drag racing.

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Old 02-20-2011, 02:24 PM
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Only 1/2 for torque reaction in a leaf spring set-up is awful low, I would recommend a 2-2.5 difference because leaf springs naturally have lots of flex. To put it in perspective we run 5-7 in a drag race application.
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Old 02-20-2011, 04:11 PM
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Thanks - but what an idiot, I forgot to mention the Traction-Master bars, which will reduce the torque reaction a bit.
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