New build

[Jimvwalker]

Just recently sold 76 k5 blazer that I acquired few years back with automatic full time 4wd that had been used as a mudracer that they somehow destroyed transmission bell housing cracking in half.
I had 3/4 4spd and NP205 transfer case that I dropped in and installed lockouts. They had 36” swampers and 6” lift so I had solid foundation to bolt to a fairly potent 350 and it drove nice for several years. Starting new build.
It’s not a k5 but it’s highly sought after truck

 

[Jimvwalker]

Just recently sold 76 k5 blazer that I acquired few years back with automatic full time 4wd that had been used as a mudracer that they somehow destroyed transmission bell housing cracking in half.
I had 3/4 4spd and NP205 transfer case that I dropped in and installed lockouts. They had 36” swampers and 6” lift so I had solid foundation to bolt to a fairly potent 350 and it drove nice for several years. Starting new build.
It’s not a k5 but it’s highly sought after truck

Just recently sold 76 k5 blazer that I acquired few years back with automatic full time 4wd that had been used as a mudracer that they somehow destroyed transmission bell housing cracking in half.
I had 3/4 4spd and NP205 transfer case that I dropped in and installed lockouts. They had 36” swampers and 6” lift so I had solid foundation to bolt to a fairly potent 350 and it drove nice for several years. Starting new build.
It’s not a k5 but it’s highly sought after truck

1979 gmc stepside shortbox 1/2
I have a wrecked 3/4 considering installing differentials and 4spd and np205
Here’s the kicker I have a 427 tall deck bbc with Eaton 5spd still attached. The 427 came out of a damaged c60 dumptruck acquired at auction. Motor runs good still with 300+hp 500ftlbs tq engine with very flat tq curve redlining at 4500 being a truck 427. Be good motor bolted to 3/4 drivetrain as I feel it would frag 1/2 components. I have everything I need to build custom truck
I’ve read in other threads were people have actually been able to use the Eaton with np205
I’m not positive how they mated it to np205 and asking if anybody here has done something similar. Do believe this would be a quite stout truck with Eaton 5spd bolted in place and slightly taller tire to take advantage of low rpm powerband
What’s your thoughts

 

[Jimvwalker]

And tall deck 427 only requires intake spacers to bolt conventional std deck height bbc intakes and an hei adjustable slip collar distributor and all accessories will still bolt to block with minor adjustments, will probably take little tweaks hear and on headers as there’s no tall deck bbc headers but being pickup should fit decent with minor mods

 

[Jimvwalker]

And tall deck 427 only requires intake spacers to bolt conventional std deck height bbc intakes and an hei adjustable slip collar distributor and all accessories will still bolt to block with minor adjustments, will probably take little tweaks hear and on headers as there’s no tall deck bbc headers but being pickup should fit decent with minor mods

Found on other boards: divorced NP205 is way to go on my particular build and have custom short shaft driveshafts cut and made at reputable shop which who I’d time to again this time with multiple driveshafts as front will be longer using divorced np205 and shorter shaft for diff. Back to other dilemma of leaving 427 stock and install motor as is.these particular

 

[Jimvwalker]

Found on other boards: divorced NP205 is way to go on my particular build and have custom short shaft driveshafts cut and made at reputable shop which who I’d time to again this time with multiple driveshafts as front will be longer using divorced np205 and shorter shaft for diff. Back to other dilemma of leaving 427 stock and install motor as is.these particular

instinces the long block feature opens lots of opportunities like investing 5k in parts and of course coming up cubic inches via stroker motor kits such as 572 cid or the 600 plus cid planting 600plus hp even capable 700 hp aspirated . So it’s looking vary feasible 600cid 650hp with 6k stroker kit although that kind of build would b possible

 

[Jimvwalker]

instinces the long block feature opens lots of opportunities like investing 5k in parts and of course coming up cubic inches via stroker motor kits such as 572 cid or the 600 plus cid planting 600plus hp even capable 700 hp aspirated . So it’s looking vary feasible 600cid 650hp with 6k stroker kit although that kind of build would b possible

That kind of would be were the Eaton transmission would shine with factory installed double 13” plus dual disc so the drivetrain would be stout enough for good burnout or slapping some heavy loads on to pull
Either way it would be bad ass built. Factory build drop a 650 concern since it would stay 4500rpm and probably give respectable mileage then there would be the beast 600plus cid needing huge cfm carb huge exhaust high rpm capable 700 plus naturally aspirated fire breathing dragon nice truck

 

[76zimmer]

Sounds like a potential monster! Good luck!

 

[Jimvwalker]

The particular tall deck truck motor has a weird longer piston with shorter rod then std deck height bbc and it’s possible to swap out to shorter conventional 427 piston and replace the rod with longer rod thus giving it (motor) its rpm potential back. Current piston has 3 top rings instead of 2 and conventional oil rings. Supposedly having 3 rings there’s less blow by increased engine longevity but being as huge as the piston is that’s why it has no rpm potential in stock form, on the plus side these truck engines already have forged internals right out of factory do to it being designed as a work.horse

 

[Jimvwalker]

I would love to install shorter piston and longer rod combo and cam it more aggressively but this motor has 69k on it barely being broke in and in no need of disassembly and new piston and rods will be spendy upgrade

 

[Wes Harden]

Found on other boards: divorced NP205 is way to go on my particular build and have custom short shaft driveshafts cut and made at reputable shop which who I’d time to again this time with multiple driveshafts as front will be longer using divorced np205 and shorter shaft for diff. Back to other dilemma of leaving 427 stock and install motor as is.these particular

Welcome to CK5 @Jimvwalker

427 in a short box step will be bad ass.

Using the divorced np205 will make the rear shaft fairly short. The more common Ford divorced np205 is driver side drop. Not sure about Dodge.
Be interesting to see

 

[Jimvwalker]

Yea I’m really excited to start project. I know I will increase weight overall by swapping 3/4 drivetrain products in but the added strength cancels out any negatives of added weight and even in bone stock 427 truck motor I think being strapped to a 4500rpm redline is very livable by utilizing a taller tire to drop say 3.73 to 3.40 or 3.20ish to work with the lack of rpm. Short stepside pickup with low rev 427 should be stump puller at any rpm. Has to be near 500 ft lbs off idle with that truck motor

 

[Chickntrk]

Sounds like a good time from what I can follow.....Dodge 205 divorced is pass side drop.

 

[tarussell]

The particular tall deck truck motor has a weird longer piston with shorter rod then std deck height bbc and it’s possible to swap out to shorter conventional 427 piston and replace the rod with longer rod thus giving it (motor) its rpm potential back. Current piston has 3 top rings instead of 2 and conventional oil rings. Supposedly having 3 rings there’s less blow by increased engine longevity but being as huge as the piston is that’s why it has no rpm potential in stock form, on the plus side these truck engines already have forged internals right out of factory do to it being designed as a work.horse

Sounds like an ambitious project and wishing ya great luck.
Something to consider while planning your build - the STD T/D 427 uses the same rod length 6.135” as normal BBC older engines.
But if ya decide on using a different piston anyway than the longer aftermarket rods are all good - just wanted to make certain you went into this with accurate parts info.
The reason for the GM ( not aftermarket blocks ) T/D increased deck height to 10.20 is for room of the taller piston with the added ring space but the pin location remained the same as did the rod dimension.
Also the “stroker kits” might not add up to 600c.i. with a factory T/D truck 427 block - this would require an over bore of more than .250” sleeves and block fill to the point of not being street friendly.
An aftermarket block designed for larger bores are made for that type of cubic inches but not a factory T/D casting - don’t confuse the added deck height with the ability to accept huge cylinder bore dimensions.

Also, another option that might work in your favor is if your 427/5-spd combo has the correct bellhousing it may come with a dual trans side bolt pattern that will accept a medium duty version of the SM465 with a larger 1-1/2” 10-spline input shaft that will use the same 13” & 14” clutch assemblies as the Clark trans does.
This would eliminate your need for a Dodge or IH divorced 205 and give you back the rear driveshaft length needed.

Good luck on this build - sounds like it will be fun!

 

[warrpath4x4]

Welcome, and im in for another stepside build