my 1992 gmc sierra
- Thread starter jdog1
- Start date
underdrive
jackwagon
So what tires did you pick?
underdrive
jackwagon
I'm betting it's a custom-build snow-cat!!! LOL
jdog1
New member
sorry for not replying sooner. it was a snow mobile demo. loads of fun. BUT! i have updates! I took it overlanding for the first time! I'm loving this truck more and more every day i drive it! I set up a cot in the bed and slept great.I am defiantly looking forward to doing more trips in this truck. the only problem I have is the god awful MPG. 
but i had an absolute blast ripping around the back roads in this thing. hopefully I can do exhaust here soon... but in the mean time, any one got any tips on getting better millage out of it?
but i had an absolute blast ripping around the back roads in this thing. hopefully I can do exhaust here soon... but in the mean time, any one got any tips on getting better millage out of it?
noJeepshere
Adventurer
Bwahaha!!!
I'm sorry, I shouldn't laugh. What kind of mileage you getting? In that I'd say 12-14 would be good, anything more and you're lucky. That was built in a time of cheap gas and low speed limits, where gas mileage was hardly a thought, much less a priority.
But, if you haven't already, new spark plugs and wires, clean the mass air flow sensor and throttle body, change all the fluids with synthetics and stay on top of tire inflation. Also, when you do your exhaust, get new O2 sensors.
sent from a slablet
justcuz
Explorer
I agree, plug gap check or replace, wires that are spiral core metal, new cap and rotor. Check and clean EGR passages and operation. Check or replace MAP sensor. Check your injectors with a timing light. O2 sensor can be checked with a voltmeter.
All these checks can be researched and followed on you tube.
GM TBI cam specs are real small 382/403 lift at the valve with a 1.5 rocker ratio.
You can buy Crane 1.6 roller rockers and increase the lift to 407/429.
A stock carbed 350 cam is 390/410
A 1978 Corvette 350 cam is a 403/415.
A Vortec roller cam is 427/427.
I don't know what the Crane roller rockers cost, but it is a lot easier than a cam change.
In the bed of your truck are pockets along the sides for 2x4's to create a double layer load deck.
You can install the 2x4's and put a plywood platform on top of them for your sleeping area.
If you use a standard 4x8 sheet you can stuff and store things ahead of and behind the wheelwells and underneath your platform.
If I had one of these I would keep it stock.
If I ever went SAS, I would use a Dodge AAM front axle with coil springs, Ford or aftermarket spring buckets, radius arms and a panhard rod. This design would be similar to the old Ford Mono Beam F100/150 front ends and just like the new and improved Power Wagon setup.
Shackle flip for the rear axle.
Put some H2 wheels on it with 35" tires and use your Chevy center caps. 
I am going to tease you here, millage is a form of tax, I have no tips on getting more millage and if I did I would become part of the problem not the solution. I like to fix stuff, not mess it up with more millage, I pay enough already!
All these checks can be researched and followed on you tube.
GM TBI cam specs are real small 382/403 lift at the valve with a 1.5 rocker ratio.
You can buy Crane 1.6 roller rockers and increase the lift to 407/429.
A stock carbed 350 cam is 390/410
A 1978 Corvette 350 cam is a 403/415.
A Vortec roller cam is 427/427.
I don't know what the Crane roller rockers cost, but it is a lot easier than a cam change.
In the bed of your truck are pockets along the sides for 2x4's to create a double layer load deck.
You can install the 2x4's and put a plywood platform on top of them for your sleeping area.
If you use a standard 4x8 sheet you can stuff and store things ahead of and behind the wheelwells and underneath your platform.
If I had one of these I would keep it stock.
If I ever went SAS, I would use a Dodge AAM front axle with coil springs, Ford or aftermarket spring buckets, radius arms and a panhard rod. This design would be similar to the old Ford Mono Beam F100/150 front ends and just like the new and improved Power Wagon setup.
Shackle flip for the rear axle.
Put some H2 wheels on it with 35" tires and use your Chevy center caps. 
I am going to tease you here, millage is a form of tax, I have no tips on getting more millage and if I did I would become part of the problem not the solution. I like to fix stuff, not mess it up with more millage, I pay enough already!
Last edited:
jdog1
New member
wow....you know i really suck at staying up to date on this. but, ya know. more excuses(like moving out). i haven't really done any modifications to the truck other then a new exhaust from flow master. but hopefully il be ripping into the truck allot more here soon.....hopefully...
