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Just bought k5 , is the 6.2 really that big of a turd?

Could my torque converter be going bad I just got this off of a site that said , signs your torque converter is going Bad

Vehicle Speed Problems
When the torque converter’s output is not consistent, it can result in the transmission decreasing or increasing the speed of the vehicle. Meanwhile, the throttle won’t have any concurrent changes because there will be varying hydraulic pressure.
 
Could be, but the failure rate on stock torque converters is fairly low. More probably there is an issue in the fuel system or not shifting up

Don't discount the tire weight that was brought up. I have a very healthy 350 that works to move 37" tires on 4.10s
 
Thanks for the help guys, I know I got this as a project and all I want to do is go wheel lol ahhhh
 
Chevy305 said:
I'm no 6.2 expert but what sort of intake is that?
Click to expand...

Uhhhhhhhhhh. :eek:

Custom, for what reason who knows. Hard to tell but looks like the valley filter is the fuel filter, but I can also see an unconnected hose laying next to the IP. But very first change those intake filters, and which ever one is the fuel. Note that 6.2s have pop injectors, makes changing the fuel filter a bit more difficult, air in the system can cause starting and running issues. When/if you change it make sure the engine is warm and get all the air out before starting, hopefully the filter has an air bleed up top and an electric lift pump.

Personally i'd rip all of that custom air intake stuff off.
 
I'd think that intake could restrict air flow more than improve it..
A "J" code intake would be the most desirable ..

A torque converter with a defective stator can cause poor acceleration,or limit top speeds,but its not something that happens frequently..diesels did use a lower stall speed converter than gas engines, (and they use 6 bolts to the flex plate instead of 3),though a gas converter will still bolt up (3 out of the six bolts line up)..

I have seen a few trucks that had a TH400 from a 454 used behind a 6.2 with the 3 bolt converter and the engine had to rev a bit higher to get the truck moving compared to the correct diesel converter..

I bet the high gearing and huge heavy tires are a lot of your issue,that and perhaps the engine cant breathe well enough with that intake..
If you have 3:42 gears and put 37" tires on it,the gearing becomes closer to 2:73 or 3:08's and the extra weight of the larger tires would bog any engine down a lot..
 
Going to add another "get rid of that current intake abortion". No wonder it has no guts, it appears to be choked to death with that weird intake.
 
I have a '90 K5 with a 6.2 and 700r4 combo that I bought back in '94 with 50k on the odometer. It was stock except for 32" tires and would easily cruise at 75+ mph and have the speeding tickets to prove it. Later in life with 38" Swampers and steel wheels with 4.10s it would still cruise easily at 65-70 mph (just didn't want to go faster with the tires!) in overdrive. Keep in mind that 4.10's and overdrive is equivalent to a TH400 with 2.87 axle gears. The fact that the OP can only go 50 mph means something is wrong with the vehicle and the 3.42 (possibly) gears are not the reason. That would affect low speed performance but you should be able to go over 50 mph. First question would be if the engine is redlining at 50 mph or simply running out of power? My experience is that a lot of the "6.2s are dogs" comments come from people who's only experience is with poorly running and unmaintained engines. Lot of people don't understand the 6.2 because it's different than a gas engine, even though it's really simple. When is the last time it had an air and fuel filter changed? I learned early on to change these on a regular basis as it would start losing power if not, and much more sensitive to any gas engine I ever owned. I've never noticed an obvious change in performance on a gas engine with putting a new fuel and air filter in (assuming the old ones weren't completely clogged or caked with mud), but could tell a difference in my 6.2 after just routine maintenance. Next question, how many miles are on it? Has the fuel pump or injectors ever been serviced? The fuel pump and injectors on this are wear items on these, and it's about the same as an old 350 gas engine that has ran for 100k miles on the original spark plugs.
 
I that is a weird intake. I would pull that off. Best way to pull that off is to leave the 6.2 attached and replace it with a LS or 454.
Then you won't have any power problems.
:rotfl:
 
^ That would be the best way to get more power,and with gas now being a dollar a gallon less than diesel,it would be a good time to do a swap..
But its a lot of work to do that,and not cheap to buy another engine and swap it in..
 
Haha yeah the intake is pretty half ass if you take a closer look it’s all steel and stick welded like crap. I went into this purchase wanting a smog exempt title and to tell you guys the truth I don’t want to put one more dime or time into the engine. Would a 350 bolt up to it or a 454? Once again I’m new to this stuff, very mechanical and I have all my welding certs, welded pipe for years but when it comes to vehicles I’m clueless lol, all I knew while buying this is I love k5’s it is smog exempt and already has a 14 bolt in the rear. I might have a buddy that has a 350 laying around that turns over and then I’ll by a efi throttle body kit.
 
Oh and the dam np208 will go into 4 low but pop out ahhh one step at a time

and when I tried to climb a hill in 4 hi when it had no guts and didn’t go any where, now it sounds like there’s a loud ting ting ish sound coming from the torque converter area lol
 
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A 350 or 454 will bolt in.
Some people will tell you that the transmission will need some work. Shift points or governor are different. Probably some other crap I don't know.
All I know, is I put a 454 in front of a 6.2 T400 and it didn't care. I had no problems. I am sure the 6.2 guys will tell you all what's different.
 
Governor tweaks will solve the shift point issues,diesels are just set up to upshift early compared to a gas engine..and you can run the 6 bolt low stall torque coverter from the 6.2 with a gas engine no problem,GM put them in many heavy duty applications other than diesels,my older brother had a 80's G-30 van with a 292 straight six that had that converter with a TH400 factory--seen some crew cabs with 454's and motor homes that had them too..

I like the lower stall speed,it feels more "direct drive" instead of a looser higher stall speed that sounds like the engine's always revving faster than it needs to be to maintain speed..probably lowers the fluid temps too,less slippage..you may need to get the 6 bolt flex plate to fit whatever gas engine you end up using--or just run 3 bolts out of 6..

I'd prefer all 6 bolts myself,flex plates aren't that expensive,and chances are the original off a gas engine will be due for replacement anyways..a lot easier to replace it before you install the engine..

Your NP208 may just need the linkage adjusted,or modified,if the truck has been lifted..if that doesn't fix it,you might be better off just looking for a rotted out donor truck and get the engine,transmission & transfer case all in one purchase..best if you can test drive it first of course too,then guessing about used parts from a boneyard or craigslist..
You'll need a lot of small things like engine mount brackets,the pulleys,P/S brackets,the 6.2's wont fit a gas engine,and other things like the throttle cable & brackets,etc--that is the stuff that is a pain to get a piece at a time from a boneyard..having a whole truck to cannibalize is the easier route..
 
beags86 said:
A 350 or 454 will bolt in.
Some people will tell you that the transmission will need some work. Shift points or governor are different. Probably some other crap I don't know.
All I know, is I put a 454 in front of a 6.2 T400 and it didn't care. I had no problems. I am sure the 6.2 guys will tell you all what's different.
Click to expand...
You can put a 454 where a 6.2 was without changing anything, but a 350 will struggle and will need the torque converter and governor changed.
Easy enough to do when changing the engine.
The 6.2 and 454 have the torque low in the rpm range so they can be interchangeable not exactly the same but close enough.
 
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