I blew up the 10 bolt in my car, and I need to replace it. Are there any older musclecars that have the same mounts that I could do a bolt in swap with?

Or if I cannot do that what are some reputable 12-bolt housings that I could buy new?

Also If I go to the 12-bolt can I keep the same length driveshaft?

 

There are no 12 bolts out of other cars that will bolt in directlry in our cars. You have to weld on brackets for the torque arm and LCA's which can be a PITA. Eaton and Dana make 12 blots for our cars that are ready to bolt in but they are pricey, around $1200-$1600.

 

Ahhh. It were only that easy more third gens would be driving around with 12 bolts in them. The only production diff that will directly fit into a third gen is from another third gen. That leaves you with 3 choices. A 10 bolt 7.5/7.625. A 9 bolt 7.75. Or if you're lucky enough to find one, a Dana44 8.5.

Aftermarket bolt-ins include 12 bolts and ford 9". They all run around the same price. Expect to pay around $2000 for a complete bolt-in diff like these.

If you can find a 12 bolt from a first gen f-body, you could use it if you decide to fabricate a new rear suspension with something like ladder bars or a 4-link.

------------------
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
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
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

 

Is a 9 bolt any stronger than a ten? I know about limited gear availability for it, but i am not sure about what a 9 bolt can handle. Thanks,
John

------------------
84 Firebird with T/A ground effects: 350 4bbl (LM1), T-Tops, auto, big K&N, 180* thermostat, ram-air hood scoop, flowmaster muffler, Accel cap & rotor, MSD Super Conductor Wires. Coming soon: new gray interior, SFCs, poly bushings

 

I got one, and as long as u dont try to make it hook up, its ok.

 

All my best results (see above) were with a 3.27 geared 9 bolt. I finally switched to a 10 bolt because I needed lower gearing.