mtx28

i have a peg leg 10 bolt diff. right now, and will soon be upgrading to a new 383 with well over 400ft/lbs of torque. i'd kill for a 9" f*rd rear, but its just way out of my price range... should i try to upgrade this one so it'd be strong enough, or go with a new one? seeing that tech articles in magazines are most often engine related, i dont konw that much about what all goes on inside the diff., or tranny for that matter. thanks for the help

TomP

Visit this link! "Upgrading the 10 bolt"
http://www.isthq.com/~dan/10bolt.html


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

sparks383iroc

I have a 10 bolt in my car now with 3.23 gears (was a 2.77 9bolt). I put in an Auburn Pro posi carrier and used the aluminum cover with the bearing braces and have yet to have any problems.

Sparks a flyin'.

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1989 L98 IROCZ, Bored .030 over,400 Crank,Dart PRO 1 Heads 200cc intake,ZZ3/ZZ4 Cam,Crane 1.6 RR,Edelbrock 3860 Hiflo TPI Manifold, AS&M LTRs, Edelbrock 58MM TB, Ported Plenum, TCI Reverse Pat Man Valve Body, SVO 24# injectors,TCI Streetfight Stall Converter, 3.23 Gears on Auburn Pro Posi, Some Suspension Mods

AlkyIROC

I had a 9 bolt in my car but the 3.27 gears sucked. I built a 10 bolt with 4.10 gears similar to how Dan explains it on his page. I never got a chance to abuse it since the engine blew up first. This spring will be the real test with abig block under the hood. Theroretically it should hold up. The weak link will be the ring and pinion. I know someone with a 67 ford. It has a 28 spline 9" with factory axles. He launches with a transbrake hard enough to pull the front wheels off the ground. He says he pulls his axles occasionally to check for twisting and hasn't seen any yet. The 9" ring and pinion definatly has the advantage over our little 7.5/7.625 gears. If I break something in my diff, that's what's going to fail first after doing all the mods.

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block buildup now in progress for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

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