The 1993 to 2000 4L80E trans are supposed to be the best years. The first 2-years had problems. I have a 1st year 4L80E in my truck, and I had to fix all the known problems it had.
CK5
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454TBI with 700R4
- Thread starter wheels87k5
- Start date
The 1993 to 2000 4L80E trans are supposed to be the best years. The first 2-years had problems. I have a 1st year 4L80E in my truck, and I had to fix all the known problems it had.
I added the TH400 to the poll. I would like some feedback on how it would work with the gears and tire size that I have.
37" KM2's and 5:13 gears.
I know there is no OD so no hunting between 3rd and 4th. But is this too much tire that it would not have the pep it has now?
37" KM2's and 5:13 gears.
I know there is no OD so no hunting between 3rd and 4th. But is this too much tire that it would not have the pep it has now?
With 37's, it think you'd be fine. But I wouldn't plan on doing your 80mph runs.
Yes, might be noisy
Because of higher rpm's? If so, that means I can go up in tire size.
OK....so with a NP241, 5:13 gears, TH400 and 42" tires I'd be running 2958 rpm at 70 mph? 44" tires would be 2824 rpm at 70 mph? Am I reading this correctly?
Is there any advantage to running that size of tire for doing trails? Is this a good or bad thing. I mean, I would need a ladder to get into my own truck.
Is there any advantage to running that size of tire for doing trails? Is this a good or bad thing. I mean, I would need a ladder to get into my own truck.
Well, bigger is always better. I have plans to got to a bigger tire when these ones are trashed.
Yes
Yes
Yes
Yes
Both
Yes
Big tires will help clear obstacles easier, less diff dragging. Too big makes it where some of the less challenging are boring.
Besides being more expensive, larger tires are also more taxing on the drivetrain.
Yes, you'll want that ladder
Well said.
Couple of my trail running buddies have 40s and they noticeably have fewer hang ups on the diffs.
OK....so far so good.
Would the TH400 be a good tranny with 40's to do the trails. What I mean is, is the gearing in the TH400 low enough to crawl up obstacles without putting too much strain on an engine?
Researching the doubler for the 241 as I type this. Interesting stuff. Looks like ORD used to make one for the driverside drop.
Is the doubler necessary?
Would the TH400 be a good tranny with 40's to do the trails. What I mean is, is the gearing in the TH400 low enough to crawl up obstacles without putting too much strain on an engine?
Researching the doubler for the 241 as I type this. Interesting stuff. Looks like ORD used to make one for the driverside drop.
Is the doubler necessary?
I havent run mine yet, but it is getting one. I was running 52:1 on 35s, and i needed more gear. I don't even do hard core stuff.
Im going to be at 104:1 on 37s
Yes, the TH400 is a good transmission. It's downfall is no overdrive. That is nice on the road if you want low gears like 5.13s. A 4L80 is nice for that. I wouldn't worry about putting to much strain on the engine. It's a big block we're talking about for petes sake! LOL. If you want to crawl around in the rocks deep gears are a real bonus. If you want to do a doubler find a 205. Then take your 241, bust it open, grab the planetary gear, split the case open and remove the ring gear the planetary set runs in and throw the rest away. Call up NWF and order an Eco Box. Put the 241 reduction in the eco box and bolt it to the front of the 205 and whamo! You have one of the best doubler systems known to man. A true 4 speed transfer case.
I've owned several vehicles with 454's that had "highway gears",like 3:08's..the BBC made up for the over-gearing pretty well,they like to pull at lower RPMS due to the long stroke..
A TH400 will have a fairly high first gear ratio,but the torque of a BBC will make that less noticeable compared to a smaller engine..
I wouldn't worry about overloading the engine--but the torque converter will take more of a beating--one with a low stall speed and the 6 bolt flex plate pattern is what many crew cabs and one tons came with factory,along with an external transmission cooler..
A TH400 will have a fairly high first gear ratio,but the torque of a BBC will make that less noticeable compared to a smaller engine..
I wouldn't worry about overloading the engine--but the torque converter will take more of a beating--one with a low stall speed and the 6 bolt flex plate pattern is what many crew cabs and one tons came with factory,along with an external transmission cooler..
What about the Vortec 454. Any real differences between that and the TBI 454? Just checking options because the Vortec 454 just came up for sale. But it has 90,000 miles on it and comes with the 4l80e.
If it were me, I would much rather have the Vortec. The power upgrade would be the biggest factor, even though it is more complicated than TBI. And since it is hooked to the 4L80E already, it is more of a 'do it and done' idea.
I know the vortec 454 would make a great motor for pulling a trailer, but would it be good for the trails? Even with a TH400 and doubler setup?
I keep asking these questions because one way or another my K5 will get a 454. I am seeing new options coming up and falling into my lap and want to make sure that I get a nice set up. I'll be doing all the work, which is, in my opinion, exciting. So keep all the input coming because BB17 is coming fast.
I keep asking these questions because one way or another my K5 will get a 454. I am seeing new options coming up and falling into my lap and want to make sure that I get a nice set up. I'll be doing all the work, which is, in my opinion, exciting. So keep all the input coming because BB17 is coming fast.
