7.5" rear behind a 455?

[pontiacgp]

I broke a no slip at the track with slicks then exploded the open spider gears on the street, took out the pinion with a 8 to 1 403 that ran a lousy 9.7 in the 1/8. The Yukon replacement open spider gears held up to a 9.4 in the 1/8 with the 350 on slicks. Any serious power is gamble on these spindly 7.5's. A girdle cover doesn't stop exploding pinion gears, mine didn't.

Mark doesn't head to the track, he heads to the boat launch pad..... 😊

 

[William]

Yes, that set up will last if you drive "normal."

 

[motorheadmike]

My wagon was equipped with a 455, TH400, and 7.5" with 3.73s before I ruined it - think the PO got it to run mid-14s.

Send it.

 

[olds307 and 403]

Mark doesn't head to the track, he heads to the boat launch pad..... 😊

A better place to go anyways! My Cutlass also went there many times. I can hardly wait for the looks come spring backing up our Go Green 2017 Dodge Challenger GT at the boat launch, planning on a Lund Fury tiller. AWD is super nice due to algae on the concrete or neccessary with our local gravel launch.

 

[DRIVEN]

Does FCA pay you every time you mention that Challenger in a post?

 

[olds307 and 403]

Does FCA pay you every time you mention that Challenger in a post?

No, I just like it that much. I would use the Olds for towing the boat but rwd means a big spin out in the launch mid summer and heating issues from the extra load. I hope his 7.5" holds out, it really depends how much he spins on the launch and the strength of the tiny Gov Lock spider gears.

 

[500/600]

Buick trusted the 7.5 so much that they didn’t use it behind a 245hp V6. Olds trusted it to much less hp. Pontiac and Chevy didn’t need it.

 

[Bonnewagon]

it did indeed have an 067 cam in it.

Thanks Jim, nothing like firsthand knowledge. I had InjectedCutty check out his Hollander's at work and he said the 067 was used too. That is actually a pretty good cam for a 350 or 400 but in a 455 it gets lost in the cubes. Mine was in a '76 Bonneville land yacht.

 

[spidereyes455]

I agree 100%. An 067 is good for a mild 350/400 but a 455 should have at least an 068. BTW mine came from a 75 GrandVille convertible.

 

[Bonnewagon]

75 GrandVille convertible.

Now there is a car I could enjoy driving. But here in NYC docking it would be problematic.