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Old 11-15-2008, 11:29 AM   #1 (permalink)
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4l60 or 4l80 doubler/w 203/205

I have searched for this and found lots of different answers and most all the post were old. What i have is 6.0 chevy to ? with 203-205 doubler the 203 will be turned up flat the 205 will be from a ford for left hand drive to rockwells with 47" ltbs. my question is which is going to be the best trans to use. Bsaed on reliability,ease of parts to use the doubler on as in 203 adapting to them,length,and cost. thanks
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Old 11-15-2008, 12:03 PM   #2 (permalink)
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4L80 is for sure stronger in stock form, but they tend to consume a fair bit of HP to get going.

27Spline 203 is the most common to fit the 4L60E, but swapping to a 32 spline to fit the 4L80e is only about $150 for a enw input shaft, so I wouldn't let that sway your choice too much, choose the tranny that is best, and go from there.
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Old 11-15-2008, 02:10 PM   #3 (permalink)
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Hey, not to sidetrack, but I see you are from poteau. Did they get the trails back on Poteau mt open again, or is Cavinal still it. I heard Vaugn was trying to get some more land somewhere to cut trails on. Poteau has always been on of my favorite places to wheel. Is there anything going on there t-giving weekend?

Do the 4l80. I like them and the 400 with the doubler because of the beefier tailhousing. Plus, it looks like youre gonna have too much rig for a 4l60 IMO
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Old 11-15-2008, 04:54 PM   #4 (permalink)
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I think on T-giving everyone is going down to Clayton but yes we are in the middle of (somthing) on Poteau mt. to see about getting some land up there,shhh TOP SECRET.But none the less the 4l80 sounds right huh? What about the hp robbing of using it?
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Old 11-15-2008, 07:11 PM   #5 (permalink)
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I think we are headed there 2. I think the hp robbing is minimal. I have had 400s in both of my rigs, and have been able to hang with my buddies running th 350s when we race. Im sure its there, but I dont think its enough to be a deciding factor.
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Old 11-16-2008, 10:26 AM   #6 (permalink)
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I agree it is worth it, I had a 400 in my K5 /w 42's. Aside from the actual internals being stronger, I've seen a LOT more TH350 cases cracked.
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Old 11-16-2008, 02:01 PM   #7 (permalink)
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I never noticed the 4l80 useing more HP than a previous t-350 I ran.

What I did notice is I can keep the transmission fluid in now since I don't break cases in half any more. Going to a built 4l80 took care of my broken transmission issues.
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Old 11-16-2008, 02:18 PM   #8 (permalink)
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I never noticed the 4l80 useing more HP than a previous t-350 I ran.

What I did notice is I can keep the transmission fluid in now since I don't break cases in half any more. Going to a built 4l80 took care of my broken transmission issues.
the thing about 80es eating so much more power is BS...it does take a FEW percecnt more, but when you are lookin at 15%+ already bein soaked up by an auto as it is, whats 3% more? 10 hp for most people. nothing noticeable. the difference is goin from a 3.06 first gear in a 700/60e to a 2.48 in the 80e. you can get a wider ratio kit for them, making first and 2nd deeper...but so far im happy with my 80e behind my genIII motor.
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Old 11-16-2008, 06:02 PM   #9 (permalink)
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The 6.0L will eat a 4l60 easy! Go for the 4l80 a stock one will take alot of abuse.
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Old 11-17-2008, 08:48 AM   #10 (permalink)
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Well i do belive i will be using the 4l80 trans,now who knows where to get the manual valvebody for it? The Transgo is $250 anyone use it? How hard of a install is it,looks like it would be pretty straight foward remove the electronic valvebody and replace i could be wrong.
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Old 11-17-2008, 09:27 AM   #11 (permalink)
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The Transgo kit is a bit more involved than just swapping out a VB. You actually have to drill out some of the passages in the VB, fill some ports on the seperator plate, add a vacuum modulator, and I believe you may have to pull the pump and front section from the case to modify something else internally from what I have seen. I have not seen many write ups on Pirate, but there is a guy on IH8mud site that has a fairly detailed setup, he also ran a 203/205 doubler. Good luck.... I am trying to find a good 4x4 4L80 right now myself to do the manual conversion. later!
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Old 11-17-2008, 08:36 PM   #12 (permalink)
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Anyone know where to get a 4l80 decently built with the manual vb for less than $2k?
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Old 11-18-2008, 04:07 PM   #13 (permalink)
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Anyone?
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Old 11-18-2008, 04:46 PM   #14 (permalink)
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Since nobody else has asked you......Why do you want a 4l80? Do you need the overdrive? Why not go with the smaller and lighter th400 and have it built to take anything for around $1K. A properly prepped th400 will take just as much abuse.
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Old 11-18-2008, 06:43 PM   #15 (permalink)
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I had a 203/241 doubler behind my 4L80, but I replaced the 203 with my version of a 241 doubler when the 203 went south. Anyway, with the 4wd tailshaft, it is still about 1 1/2" to long for the 203, so I have a spacer that I had machined to go between the 4L80 and the 203 that I have no use for now. If you need it or can use it PM me, I live NE of Claremore so shipping won't be much.
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Old 11-18-2008, 06:55 PM   #16 (permalink)
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What is the advantage of the manual valve body?
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Old 11-18-2008, 06:59 PM   #17 (permalink)
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4L80E is nicer as the gear spread is closer not to mention the fact that its tons stronger overall. You will only notice the lower first gear upon take off in high range. Generally most trucks pull first gear well in low range but can struggle on the shift into second with the large gap on the 700R4 especially in steep dunes etc. With a 4L80E you will have about 20% more speed before shifting into second and this helps your truck pull the next gear more easily.

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Old 11-19-2008, 07:43 AM   #18 (permalink)
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The manual valve body keep you from having to run the trans computer controlled therefore having to shift it manually.No i dont really feel like i need the overdrive but would like to have it.Still out on what to use as far as a 400 or 4l80.
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Old 11-19-2008, 08:22 AM   #19 (permalink)
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Unless you need OD, go th 400. But, if you want the 4l80, why not run it off of the computer. If you are running a 6.0, it shouldnt be that big of a deal. Unless you already have a harness and computer with the trans eliminated. If Im not mistaken, I heard that the 4l60 and 80 will take off in 2nd stock. Is that right?
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Old 11-19-2008, 11:38 AM   #20 (permalink)
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Anyone know where to get a 4l80 decently built with the manual vb for less than $2k?
I deal with a lot of heavy equipment Allison transmissions at work and I always get this company faxing me complete rebuilt light truck trannies. They advertise a 4L80E 4x4 trans complete with converter for $979 sold outright. It has a 5 year unlimited mileage warranty on parts and labor. For that price, you could always just do the manual conversion yourself.....
their phone number is 877-760-8726 Parts Warehouse..... never bought anything from them, but seems like a really good deal.
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Old 11-24-2008, 07:46 AM   #21 (permalink)
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Which output shaft do i need for the 4l80 to go to the 203 the full spline one or the 4wd one?
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Old 11-24-2008, 09:21 AM   #22 (permalink)
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I don't think either stock shaft would work but I'm guessing the longer one could be made to work. I'm guessing you would need a custom adapter from Advance Adapters or someone else along with a custom output shaft. The 4L60 and 4L80's do not start in second gear in any range unless they have a manuel valve body.
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Old 11-24-2008, 10:52 AM   #23 (permalink)
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Actually from what i have read here on PBB the turbo 400 to 203 adapter will work just fine but i am not sure on the stick out of the 400 shaft to the 203 these are the known shafts for the 4l80 Name:  DSC00132.jpeg
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Old 11-24-2008, 11:25 AM   #24 (permalink)
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It is the 4x4 shaft you would need. The tailshaft will have to be shortened roughly 1" from what I here from those who have used it. They also retained the transfercase adapter and redrilled the face of the 203. The pilot of the adapter housing is the same as the bearing retainer on the 203 input. You may have to use different bolts on the input retainer (shorter head) so they do not hit the adapter on the inside. Do a search at www.ih8mud.com there is a guy that has a pretty detailed setup on there.
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Old 11-24-2008, 12:03 PM   #25 (permalink)
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I think i can use the 203 to 400 adapter to mate them up.
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