I just bought a 8.5 Grand National rear end for $650 it has the casting number 3TP. I believe it has 3.42 gears in it. I was wondering if there is a big difference between the 3.42 gears and the 3.73 gears..... And if there is a difference between conventional posi and limited slip posi??????
Rearend Rear end??????
- Thread starter mhsmontels1
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As for the rearend gear ratio i can't help you cuz i am debating on either 3:42's from a GN or 3:73's from a 442 both 8.5 rearends except the 442 is open and the GN is a posi but both would need a rebuild... As for the posi it's the same as a limited slip and congrats on picking up a 8.5 GN rearend for 650, sounds like a good deal! Looks like it came from a GN..
I was told the rearend came out of a 86 Grand National that was stolen and later wrecked. The previous owner bought the car from a salvage yard thinking they would give him a rebuilt title but they didn't so he was forced to part it out.
The more gears you have the more pickup your have. With more gear makes your RPM go up and fuel economy go down too. If you have overdrive then I would say go with 3.73
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