Well here goes, I had a nice 50 3800 ex firetruck with low miles and completely solid and straight body. It was powered by a dual carb 261, it ran and drove really well. I was going to upgrade to a 302 gmc so I pulled the engine and completely stripped the cab in preparation for a full paint job. Meantime I find another project or too ( I got AD ADHD, anyone relate? ) and get an offer on the body I couldn’t refuse. Well I miss having a 1 ton and I’ve got a 48 gmc 1/2 ton longbed which will make a great cruising truck so I traded my chassis back from a buddy and I’m going to put together another 1 ton for a DD. Currently have a 261 in the machine shop. It’s gett an edmunds 2x2 intake with Langdon Carter Weber setup, bulldog cam, small cap HEI, Fentons and full balance of reciprocating assembly. I just picked up a Dana 61 axle from an early 90s Dodge and a New Process NP540 direct drive 5 speed trans. The rear ratio is 3.07, with 7.41 1st gear and 4.05 2cnd in the trans I’ll be able to pull/haul anything I want to and drive the interstate too.
Last edited by bluechev; Wed Feb 20 2019 04:31 AM.
I’m not seeing the caption with my pics. The yellow and black truck is a 47 3/4 ton I’ll be using it’s cab. The primer and red truck is my old 50 3800 ton I’m using it’s chassis but going with single wheels for practicality/economy’s sake. 16x6 F250 wheels, common 235/85R16 tires. The last 2 pic are of course the NP540 5 speed.
Ha! It’s a little rickety I used 1-1/2x1-1/2x3/16 angle cuz I got a bunch of it, 2x2x1/4 woulda been better but it’ll suffice. Thing weighs 175 lbs I didn’t feel like wrasling it in the floor or on the work bench so I spent most of a day making it. I can sit in an old swivel office chair and play with it, definitely worth the time!
Don't forget, GMC's are about 3" longer than Chevies.
NP 540 series make great trans' for your application, I have adapted several to 4wd applications.
I’m decided to save the 302 for my 48 gmc 1/2. I’m getting 261 and 848 head machined right now for it, will have Edmunds 2x2 intake with Langdons carter Weber setup and some other goodies.I’ll have to swap a stock Chevy crossmember back in the frame because I modified the original to fit the gmc. These pics show what I did to the crossmember, I couldn’t resist adding one of my 302 I made the intake outa steel, it’s too heavy but hey it ain’t a race car. As much as I love the old SM420 4 speed im sure this 540 trans is going to be so much better. With the 3.07 rear gears I’ll be able to downshift to 4th and still maintain 55-60 mph
Thanks, I know I’ll really enjoy driving it and using it like a truck I hope you guys will check on me from time to time and help me stay motivated I’d like to get this thing running in the next 6 months to a year.
Last edited by bluechev; Tue Feb 19 2019 02:01 AM.