i was just at a car show this morning and my friends 69 coupe was there, i was talking to his dad and he told me that it still had the 6 inch rear in it with 2.90 gears. he has a 392 stroker engine in it pushing 415hp. and on the track he runs 13.3 at 104mph. how the heck can that rear end hold it and put out those times?

 

A 6"??????? Haha, he's a moron. Thats how. I've never even heard of it.

 

It's either an8 or 9 incher. No such thing as a 6" in anything resembling the modern (1960+) era. 2.90's also sound suspect...

 

The original would've been an 8", and it's possible that it could hold up for a while with that engine, assuming he's not running drag slicks, and if he replaced the diff with a 4-pinion unit it would get him even farther. But yeah, it probably won't hold up for long

 

ooops haha, im sorry i definetly wrote that wrong. its the original 6 cylinder rear, its an 8 inch with 2.90, wow i screwed this one up

 

Wrong again. The 6-cylinders came with a 7.5" rear end. The 8" can handle 400-450hp from a small displacement V8 without too much worry. Also, 8" highway gears are 2.73, 3.00, and 3.25.

 

no im not wrong, hes wrong then. i accidently said 6 inch instead of 6 cylinder, and i was told 8inch with 2.90 gears, when i looked underneither it was an 8inch but dont know about the gears. and ive been told by countless people on here that an 8inch wont hold up to a 347 stroker. that puts out 400hp so i dont know what to say. just thought it was interesting that he was putting out those times with 2.90 gears