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I have a 67 Dart 340, 4 speed with a transplanted 72 engine, 4 speed overdrive, and differential. The differential pumpkin is a 1820657, a C body diff (58-64) with 3.58:1 (yes, I said 3.58) gears, an open rear (non-sure grip). Wanting to put a sure grip, I bought a 489 pumpkin with 3.55:1 gears...

I have an 8 3/4 rear in my 67 Dart. The rear is an older pumpkin type 1820657, open rear. If I put the old style Sure Grip, the Dana Power-Lok (# 2881487) from 1964 a clutch type in that pumpkin, is that going to fit? OR will there be issues with axle lengths and or thrust block widths? I'm not...

My 67 Dart 340 hybrid has 8 3/4 rear, type 1820657 (58-64). It acts like a non-Sure Grip (wheels don't spin in the same direction when off the ground). The gear ratio on these units is stamped into the case toward the back, on the opposite side of the casting numbers. The numbers stamped appear...

I Just bought a 67 Dart 340 4 speed.. It was stated to have a "posi" 8-3/4 rear... I tried to do a burn out to check the dual traction rear with no noticable 2 tire burn marks, due in part to the type tires and the cold weather... Next step I put the car up on 4 jack stands to check the car out...