Tid Bit. Getting to the top of the mountain. And not over load the engine or transmission.

[john phillips]

Is there a downside to a SP other than not realizing and abusing it?
What is the approximate extra cost?

> I have had a switch pitch in my coach since I started driving it in 2005.
> Have used the SP infrequently...mostly accelerating from stop light or
> accelerating on ramps. But have also used it in reverse backing up steep
> driveways. Pretty handy for that. Knowing what I know now, I'd probably go
> for the SP again. Even though I don't use it very much, it is nice to
> have that option. JWIT
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
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--

*John Phillips*

 

[LarryW]

The downside is finding one. The 425SP was, IIRC, only available on the 66' and 67 Toro and the 67' Eldo. It was mated to a 3.21 FD. Then if you
have it rebuilt, you would need to find a good SP converter, or a company that knows how to rebuild one. Depending on the condition of the Trans, cost
would be about the same or a little more than rebuilding a 425. Finding now is the tough part. JMHO
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.

 

[johnny]

" Many of the old muscle cars could be destroyed in a single extended high speed run." No foolin'.... And I expect a 455 wrung all thw way out would
do the same... they're never run that hard in the GMC except up long grades and if Jimmy the K is driving.
As to the muscle cars, I've blown up more than three Chevelles on I 85 between Auburn and Montgomery... with a 440 Charger which was misbadged
Stick the fender just ahead of the kid in the Chev and keep it there till he blows. Usually takes under ten miles.

--johnny
--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased