I hear it all the time, get a 12 bolt rear...

[grumpyvette]

I can,t tell you the number of times I see guys with chevelles,camaros, etc, that have problems with a 10 bolt rear. and the first thing you hear is get a 12 bolt, well, a decent 12 bolt is ok, but pro built it can easily cost over $3K, and if your swapping to a stronger rear differential anyway look over your options,

heres a typical 10 bolt after being subjected to high stress

even ford 9' rears get trashed frequently

viewtopic.php?f=71&t=1261&p=2709&hilit=narrowing#p2709

viewtopic.php?f=45&t=757

http://www.carcraft.com/techarticles/cc ... to_01.html

dana 60 vs 12 bolt chevy
ok I just got to ask, why would anyone pay $3200 plus for a 12 bolt when theres bolt in rears based on a hybrid dana 60 available with its 9.75" rear gears that are darn near bullet proof,that are significantly stronger, and depending on options ,costs less vs the chevy 8.7/8" gears and lower strength assembly
yes the chevys 25 lbs lighter but that 25 lbs is all steel that makes the dana 60 hybrid significantly stronger

http://www.strangeengineering.net/catalog/index.html

I destroyed several 12 bolts beore swapping to a dana 60 with a nitrous BBC in a camaro, I installed a dana 60 and never had another problem

the reason I bring this up, is that theres DOZENS of options

http://dfwmotorsport.com/Fairlane/9inchrearends.htm
http://www.kevinstang.com/Ninecase.htm

http://www.ford-trucks.com/article/idx/ ... build.html

http://www.off-road.com/trucks4x4/artic ... ?id=198404

http://www.autohobbydigest.com/dana.html

http://www.pirate4x4.com/tech/billavist ... Rea%20Axle).PDF

http://www.offroaders.com/directory/axles/dana60.htm

http://www.currieenterprises.com/CESTORE/alldana60.aspx
AS a general rule, a performance street cars rear gear ratio multiplied by the transmissions first gear ratio should fall in the 10:1-10.5:1 range with tire diameters in the 25"-28" diam. range

http://www.cprparts.com/HPcalculator.html

http://www.wallaceracing.com/et-hp-mph.php

http://www.ajdesigner.com/fl_horsepower_trap_speed/horsepower_trap_speed.php

http://www.gregraven.org/hotwater/calculators/qm-from-wt-hp.php

http://users.erols.com/srweiss/calcehp.htm


related info threads
http://garage.grumpysperformance.co...electing-a-torque-converter-stall-speed.1715/

http://garage.grumpysperformance.co...late-gear-ratios-and-when-to-shift-calcs.555/

http://garage.grumpysperformance.co...earing-and-trans-choice-made-correctly.11697/

http://garage.grumpysperformance.co...hing-the-drive-train-to-the-engine-combo.741/

http://garage.grumpysperformance.com/index.php?threads/select-a-gear-ratio-or-trans-or-both.10493/

the ford 9" and dana 60 rear were used for years in trucks and a few cars, theres still plenty out there in salvage yards and many are also reasonably priced