Ok, I have an 85 drum open rear with 3.42's in it. I want to pop in an SLP take off unit. The the take off unit have gears on it? If not, putting the 3.42's on it would be fine.

But now, would it pop into my current rear end? When people say "spline" what are they refering to? What years are what spline!

AHH, my head hurts! HELP ME!

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85 2.8L Sport Coupe 5-speed.
Mods: Hpertech chip and powerstat, MSD 6A-L, Crane fireball coil, Accel Cap and Rotor, Dynomax hi-flow cat and catback system with a dynomax magnum race bullet muffler on the i-pipe, K&N filterchargers, Gutted Air Boxes, 8mm Wires, Eibach Sportlines and Tokiko springs/shocks setup, Global west sub frames, Suspension techniqs front and rear sway bars, and good ole 88 IROC wheels with Kumo Ecstas on em!
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My Car

 

The SLP takeoff will not have gears. Your existing 3.42s will go right on it.

The spine deal has to do with the axles, where they slide into the side gears, which are part of the carrier. Starting in 89 more or less, GM went from 26 spline axles to larger diameter 28 spline ones. The 26 spline ones will slide right into a 28 spline carrier and just sit there while the carrier spins, because their diameter is so much smaller that the splines won't even touch.

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"So many Mustangs, so little time..."
ICON Motorsports

 

So if you upgrade to the SLP unit you will need to find some 28 spline axles from a 90-92 f-body or you can buy some better 28 spline aftermarket ones from companies like www.drivetraindirect.com for $125 each

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87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block (times are for the current engine)

Best ET on a time slip: 11.447 altitude corrected to 10.99
Best MPH on a time slip: 119.42 altitude corrected to 124.86
Altitude corrected rear wheel HP: 493
Best 60 foot: 1.586

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87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

how much to get one installed professionaly? any ideas?