Masiony
1/2 ton status
is there any benift of going to a 4L80 over a TH400, other than OD (or the cool factor)?
CK5
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4L80 or TH400?
- Thread starter Masiony
- Start date
1985_K5_Silverado
1/2 ton status
Fuel economy, due to the OD. Do you do any appreciable amount of highway driving?
http://www.tciauto.com/tech_info/gear_ratios.htm
http://www.tciauto.com/tech_info/gear_ratios.htm
Masiony
1/2 ton status
1985_K5_Silverado said:
not sure yet, but as i said, i dont want to consider OD. im looking for other reasons to run a 4L80.
1985_K5_Silverado
1/2 ton status
Lockup torque converter (but that's only in OD). Computer control. Again, fuel economy, and note the 3 lower gears are identical ratios. The 4L80E is a more complex piece of gear, and you know what they say about people that pay for complexity (OD, lockup TC, computer control) that they aren't going to ever use.
Masiony
1/2 ton status
basically, when my 700 goes 
, i want to figure out now what to upgrade to. but currently i am running 4.56 and 35's on pavement.
, i want to figure out now what to upgrade to. but currently i am running 4.56 and 35's on pavement.
Masiony
1/2 ton status
im also running 4.56 and 35's on the pavement.
I am running 4.56's and 35 and I have a 400 trans. I can pull about 3500 rpm on the highway, so if you can live with that then your ok. Other than that a 4l80 is just a 400 with OD. I am contemplating one for the future when I up the tire size and stuff in some 5.13s. I will only go with full manual setup with no comp or lockup converter for the complexity reasons as mentioned before. Only real benefit is the OD in that case, oh and if you go manual in a 4l80 I was told you can't get it in reverse pattern like the turbo 400. That just means a little more work shifting to 1st from reverse and makes rocking the truck interesting. Length difference is minimal, a couple of inches or so, and strengths are even except in the overdrive gear. It will take you more work to adapt it to a cast iron trans but that is the fun part and there is a good thread here on mating to a 205 if you use the search function. Cant think of much else. Basically just depends on highway time, flat highway time, OD value is debatable here in CO with the mountains.
-ALEX
edit: price difference, just found two HD case 400s today one with 205 t-case and one with a pass-drop 241, $50 for either setup
-ALEX
edit: price difference, just found two HD case 400s today one with 205 t-case and one with a pass-drop 241, $50 for either setup
Masiony
1/2 ton status
well, it would most likely be running a 241 doubler setup behind it. doesnt the 241 come behind the 4L80 factory?
Masiony
1/2 ton status
also, whats the average price difference?
yes and it is a lot easier to find that adapter than the 205 adapter made in 91 only
1985_K5_Silverado
1/2 ton status
Here's another important TH400 vs 4L80E consideration - take a look at the price difference. It can be significant, and I saw on the transfer case thread (the one where they seem to want hurry-up-fast answers, on somewhat unusual gear, in the wee hours of the morning) that you wished you had that kind of money to throw around.
If money is tight, the choice is pretty much obvious. If money isn't tight, then:
What do you intend to do with the truck?
If money is tight, the choice is pretty much obvious. If money isn't tight, then:
What do you intend to do with the truck?
I have seen 4l80's from 60 to 120 around here in the cheaper yards for core and up to 500 at others. I can always find 400's for under $100 around here
Masiony
1/2 ton status
the truck is an 85, running 87 TBI. is there any conflict with computer things?
not if you get a stand alone system from a company like TCI and such, but then you get spendy ~$800 new but you can find cheaper on ebay. Actually there is one there right now at $500
Masiony
1/2 ton status
1985_K5_Silverado said:
haha, you saw the other post. well the truck will be a rock basher. core price is probably what i am looking for, i can rebuild them myself. just looking for future options. got to plan ahead when you pay for tution too.
Masiony
1/2 ton status
WRENCH-HEAD said:
is there a non-computer controled one?
anything against manual valvebody??
in short no, only manual valvebody eliminates the comp
edit: not sure if any convert it to vac operation
edit: not sure if any convert it to vac operation
Masiony
1/2 ton status
im not really familiar with the term. this is actually my first 4x4 auto.
the rig will see highway, but only to and from the trail.
the rig will see highway, but only to and from the trail.
Used when the trans no longer shifts on its own, you shift for it. Originally a race setup now working into the 4wd world. In essence it turns the auto into a stick shift with no clutch pedal. then you would want to run a gated shifter or the likes to make sure you get the right gear.
