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Old 08-09-2012, 05:13 AM
95silverado 95silverado is offline
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Originally Posted by matt167 View Post
The transmission you want won't hold 500 HP, the engine you have is making 250 horsepower, give or take..
You can't boost the compression and add a supercharger, it's actually best to have it a little low for a supercharger. You can probably get an engine to run 350 HP with another set of heads and you will have a ton of fun with it.

As far as the 5spd, what came in 1500's of that era was a NV-3500 which is a very weak/ finiky trans and has a rating of 300 ft/lbs. Any more than that and it starts to come apart ( and there are NO upgraded parts ) What you have is ither a super rare SM-265 that was basicly modified to fit the '88+ trucks ( only found in 3/4 ton and 1 tons for a couple years), a SM-265 for a '73-'87 truck mod'd to fit or an NV-4500, found in M/T 3/4 ton and 1 ton's after like 1992. It's 4 speed plus a granny gear, but is considered a 5 speed, shifts like a truck trans, can't shift it very quick, but it'll take a lot of power ( same trans as 5spd Cummins Dodges ). Your 5spd options are basicly transmissions that will cost far more than a grand to buy ( Tremec 3550 or TKO 500 would do well ).. The easiest thing to do is accept that it's not a race car, build the engine enough that you can have some fun while being practical..

What you want will cost $20k easy.
thanks, I'm not on a strict budget because I'll be spreading this out over a few years. Right now, I'm just trying to go one step at a time...upgrade a little, upgrade again in a year and so forth.

I will look into the Tremec or TKO. Which one would be the wiser choice, or are they both about equal?

As for the supercharger... since I will replace the heads with vortec heads, and the motor hasn't changed stroke, would it be safe to assume a supercharger would still be ok? If so, could I manage to squeak close to 400 hp and boost low end torque with it and some minor modifications to what I have now?

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