7.5 GM Rearends Why are they weak
Everyone says I need to change my rearend because it's crap. Can you improve the stock rearend? What exactly breaks on the rearend? 
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No on can do anything with the "10-bolt" aka 7.5" rear
people think that the TA Girdle will help (and it does) but in the long run, if your a manual transmission, and go to the drag strip and run DR's you WILL blow it ... maybe tomorrow or maybe 7 years from now. In short our rears are a ticking time bomb (strip wise) and we don't know how long the fuse is. if your car never sees the strip you will be fine (usually) . The automatic's tend to be easier on the rear, but that is only delaying it (if they go to the strip)
Rhode Island Red *Lurker since 1997*
2002 Firehawk #0035/1503 !Cags | !Air | !PCV | Airborn-coated Kooks LT's | Powerbond UD Pulley | Custom Cam | Ported Oil pump | LS2 timing chain | Comp 918's | Hardened push rods | LSS | BMR STB | SLP Bolt-on SFC's | drill mod |TB Bypass | Ported TB | Custom Dyno tuning | 160* thermostat | LS7 Clutch
Ordered: May 1, 2001 Built: June 1, 2001 Delivered August 25, 2001
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I was talking with a few guys on LS1.com that are in the 10's with the stock 10 bolt!......but thats the exception rather than the rule.
Plain and simple....theres not enough beef to the 7.5 inch rear. The diameter of the ring gear doesnt allow for much strength in the gears. The axles are spindly and only held in with little c-clips. You can beef them up with custom axles and stronger gears, but youd be better off putting the money into a 12 bolt or 9 inch. You can only do so much with a 7.5 inch rear.96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there
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How much would a 12 bolt cost?Comment
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there is a newer thread that is talking specificaly about 12 bolt rear ends
http://www.f-body.com/forum/showthread.php?t=10953
in there they talk about the 2 top kinds and a ball park figure on cost.94 Formula Firebird, 355, heads port and polished, cc503 cam, 30# injectors, PCMforless Tune, B&M 2400 stall, K&N CAI, BBK Sorty Headers, Magnaflow Highflow Cat, Borla Catback exhaust with electronic cutout.Comment
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search buttton is your friend...
-Lou -
1997 30th Anniversary Firebird FormulaComment
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