What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

Decisions decisions. 4l80e or 4l65e?

Just looked at grimmjeeper.com (those gear ratio charts are complete BS). I'll be running 1790 rpm @ 70mph with 37s and 4.56s. Yeah, I don't think that is ideal, but it'll get me around for while.

Eventually I want to put a front locker in so that would be a good time for gears. I just need to get it running and these other major expenses done first and I'll worry about gears later.
 
37" tires with overdrive? 5.13 gears all the way. Been running that setup for a decade driving my rig to and from the trails and love it.
 
chris85 said:
BUT

I have to change the 241 input to 32 spline...
Click to expand...
I didn't realize it when I first read this post but the reason you still needed a 32 spline input was because the one I sent you in the mail got lost. :doah: :unsure:
 
ashman said:
I didn't realize it when I first read this post but the reason you still needed a 32 spline input was because the one I sent you in the mail got lost. :doah: :unsure:
Click to expand...

Haha! Yep! But it's starting to look like I dont need it after all. Still sucks they lost it.
 
I run an lq9 4l65e and 241 with SYE on my truck with one tons and 4.56 and 40" tires. I find it perfect. 1900 rpm at 75 with lockup.

The 4l80 is a lot bigger, heavier, longer and more drag. I plan on going to a built 4l65 when and if I grenade this one.

Heat is the main issue. I run a derale puller fan cooler and run the trans through the radiator. I still see 230 when towing up a grade but it cools fast.

The 65 has an upgraded sunshell compared to the 60 and I think it is a terrific trans.
 
K30Blazer said:
I run an lq9 4l65e and 241 with SYE on my truck with one tons and 4.56 and 40" tires. I find it perfect. 1900 rpm at 75 with lockup.

The 4l80 is a lot bigger, heavier, longer and more drag. I plan on going to a built 4l65 when and if I grenade this one.

Heat is the main issue. I run a derale puller fan cooler and run the trans through the radiator. I still see 230 when towing up a grade but it cools fast.

The 65 has an upgraded sunshell compared to the 60 and I think it is a terrific trans.
Click to expand...

Oh I'm well aware of what you're running! :D I think one of your videos is what got me thinking about ditching the 80 to begin with.

I think I'm pretty set on going with the 65. For the same money (actually less, considering I don't have do as much to the TC) I can get a built 65 with a HD cooler and cooling pan. And it will bolt right in. That's a huge postive! Ashman is already hooking me up with the VSS adapter so now it's really just a matter of unloading the 80.

I do plan to run a heat sink in conjunction with the HD cooler for some extra insurance.

I was contemplating going with 40s but I don't think I want to trim that much. With the input I got from this thread I'm going to start out with 37s and I can either regear or get bigger tires later, or both :whistle:
 
Lol, I forget that people watch my videos. The numbers I see on them are hard to wrap my head around. Hard to imagine 100 people watching my vids and then I see 10k views and I am like wtf lol.

I have abused my 4l65 pretty good. Overheated once and that was after serious beat down lol
 
I agree with wanting my gear, I started out with 4.56 and 37s. In the process of swapping over to 5.38s right now. If you do decide you want to run a 4l65 I have an extra electronic vss setup for a np241, if you interested let me know.
 
Tweekls1 said:
I agree with wanting my gear, I started out with 4.56 and 37s. In the process of swapping over to 5.38s right now. If you do decide you want to run a 4l65 I have an extra electronic vss setup for a np241, if you interested let me know.
Click to expand...

You have the housing? Or the adapter? Ashman is sending me the Dakota digital VSS adapter.
 
So when doing this VSS conversion you have to get a 90-91 gauge cluster? Is there any other way of doing this besides buying new, electronic gauges? I found and just skimmed over the write up from Jeff in co.
 
Tweekls1 said:
Tailshaft housing from a 91 suburban.
Click to expand...

You can use the tailshaft housing with the electronic output, or the adapter that I have. I've used both. I was using the adapter on a 208 with a mechanical output, but then switched to a 241 that had the electronic output so didn't need it anymore. Both hooked up the same, so either one will work for what you are doing.

chris85 said:
So when doing this VSS conversion you have to get a 90-91 gauge cluster? Is there any other way of doing this besides buying new, electronic gauges? I found and just skimmed over the write up from Jeff in co.
Click to expand...
There is an adapter out there that puts out the electronic signal for the VSS, but also has a connection for the mechanical speedo on the end of it. I wanted new gauges anyway so I didn't put much effort into it, but as I recall it was fairly expensive. Of course take that with a grain of salt. I've recently found out my recollection of the cost of this stuff is suspect. :whistle:
 
Tweekls1 said:
If you use the adapter he has you can leave the cable tailshaft housing for the speedo.
Click to expand...
Unfortunately, no. The adapter goes in place of the speedo cable. There isn't a way to hook up both using this adapter.
 
Tweekls1 said:
Gotcha, my fault for assuming you where referring to this http://www.advanceadapters.com/prod...5e-4-speed-automatic-transmissionadapter-kit/
Click to expand...
I found that adapter when I was doing mine, but was able to find a much simpler and cheaper option from dakotadigital.com

The adapter I have is this:
http://www.dakotadigital.com/index....ct_id=620/category_id=-1/mode=prod/prd620.htm
It bolts in place of the mechanical speedo cable and outputs a signal for the VSS input of the PCM. You then run your electronic speedo from the gauge output of the PCM.

However, if you want to keep your mechanical speedo, they have this:
http://www.dakotadigital.com/index....duct_id=57/category_id=-1/mode=prod/prd57.htm
slightly more expensive, but still a lot cheaper than the advance adapters kit.
 
chris85 said:
Just looked at grimmjeeper.com (those gear ratio charts are complete BS). I'll be running 1790 rpm @ 70mph with 37s and 4.56s. Yeah, I don't think that is ideal, but it'll get me around for while.

Eventually I want to put a front locker in so that would be a good time for gears. I just need to get it running and these other major expenses done first and I'll worry about gears later.
Click to expand...


Hmm, looking at grimmjeeper again and now it says I'll be running 2029 rpm with the 4.56s, 37s @ 70 mph. That's a lot better.

1976 rpm with 4.56/38s @ 70 mph and 1877 rpm with 4.56/40s @ 70 mph.

This seems to be more accurate since k30blazer said he runs 1900 @75 with the 4.56/40 combo.
 
my combo is 4L80-e/203-205/5.13 gear / 35" tire .

70mph = 2586 rpm

my end use is more work truck trailer pulling and snow plowing .

only thing I wish was gm had done a low gear 1st in the 4L80-e trans . .
 
You must log in or register to reply here.

Latest Posts

Top Bottom