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Old 03-21-2010, 07:38 PM   #1 (permalink)
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4L60E to NP205 Adaptors

Anyone know any cheaper alternatives for mating a 4x4 4L60E to a 205 other than Advanced Adaptors?
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Old 03-21-2010, 10:30 PM   #2 (permalink)
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Which 205 do you have? The newer round adapter type or older figure 8 style?

Will
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Old 03-22-2010, 08:13 AM   #3 (permalink)
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I've got a 205 out of 85 1ton that was mated to a sm464. When you refered to the newer 205's were you talking about 89-93 dodge 205's?
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Old 03-22-2010, 08:18 AM   #4 (permalink)
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He was talking about the figure 8 pattern or the round pattern 205,if it is a round pattern 205 re-drill the face of it.
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Old 03-22-2010, 08:19 AM   #5 (permalink)
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no, he isnt.

on the face of your 205, which pattern do you have?

is it THIS ONE;


or this one:


GM used two different np205's. this is the way to tell the difference.
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Old 03-22-2010, 08:25 AM   #6 (permalink)
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as for a cheaper alternative, you can get a 2 inch thick adapter plate to bolt to the back of a 700r4 and that will allow you to bolt the th350 adapter and np205 to it, making your drivetrain longer than the th400/np205 as well as adding more leverage to your transmission case in its weakest point. but hey, people do it.

Why do you HAVE TO HAVE the 700r4? you reading magazines telling you that you need a lower gear and an overdrive?

a cheaper alternative is a th400/np205, especially when you consider how much a rebuilt 700r4 costs when you have to rebuild it 3x-5x as often as a th400.
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Old 03-22-2010, 12:23 PM   #7 (permalink)
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as for a cheaper alternative, you can get a 2 inch thick adapter plate to bolt to the back of a 700r4 and that will allow you to bolt the th350 adapter and np205 to it, making your drivetrain longer than the th400/np205 as well as adding more leverage to your transmission case in its weakest point. but hey, people do it.

Why do you HAVE TO HAVE the 700r4? you reading magazines telling you that you need a lower gear and an overdrive?

a cheaper alternative is a th400/np205, especially when you consider how much a rebuilt 700r4 costs when you have to rebuild it 3x-5x as often as a th400.
Am I wrong in thinking that the 4l60e is a better tranny than the previous 700R4?
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Old 03-22-2010, 02:59 PM   #8 (permalink)
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Am I wrong in thinking that the 4l60e is a better tranny than the previous 700R4?
um... well, when it comes to rebuilding it.. no. its more expensive. its also electronically operated. that means you buy a kit to get rid of the computer *added cost* to operate it with a setup that isnt computer controlled already *IE, Carbed*

a 4l60e, 4l65e etc are just different and updated versions of the ill fated 700r4. if they fail behind a 4.3 and/or a 2.8 v6, why do people think they will hold up behind a big block?

thats something i will never comprehend... of course, people throw money away every day when a magazine tells them "its the hot ticket".

so, lets do some math..

th400, shift kit, 34 element sprag around 800 bucks.
700r4, shift kit, corvette servo, upgraded valve body, pump, etc... 1500-2100 bucks.

4l60e/4l65e same basic mods as the 700r4, 1800-2500 bucks.

load ratings... well, lets just say a th400 has been installed in motor homes that have a 30k lb weight....

how many 700r4s do you see in ANYTHING over a one ton from the factory?

ever see a 700r4/4l60e from the factory with a big block in front of it?

so... you could buy 2 th400's with the right stuff, and be money ahead. or... you could buy 1 700r4/4l60e and pray that it holds together. And, when it fails *because it will fail*, you are out that money, where you could have had a SPARE th400 for free.

its your money, spend it where you want, how you want.

if youre looking for mileage, you wont find mileage with large tires, greater rolling resistance, greater wind resistance, or overdrive transmissions trying to push the vehicle to get better mileage. Mileage comes from small cars.

Edit: a lot of people call me a hater of 700r4 and 4l60e transmissions. Honestly, i think theyre a great thing. why? because it keeps my buddy that owns a transmission shop in business. they are one of the hottest items going through his doors due to the failure rate. hows that for job security?

Go ahead, get one, two, three, four... he doesnt mind, he has bills to pay.
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Old 03-22-2010, 03:04 PM   #9 (permalink)
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Nah I was just asking. I already built a th350 for my mud truck. It's hard as hell to find a 400/205 around these parts. Only one I found and the guy as gonna sell it til I wanted to buy it

I search CL everyday almost
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Old 03-22-2010, 03:13 PM   #10 (permalink)
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find a 4spd 205 or a th350 205 with the smaller input. have it machined to fit the th400 input bearing. buy the th400 input, generally 100-125 bucks. the bearing is like 40 bucks.

get a 2wd th400.

get the adapter, generally about 200-250 on ebay.

problem solved.
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Old 03-22-2010, 04:20 PM   #11 (permalink)
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oh, and if you question my prices, try going to monster trans, you can check them for yourself... HERE
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Old 03-22-2010, 04:46 PM   #12 (permalink)
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oh, and if you question my prices, try going to monster trans, you can check them for yourself... HERE
I have been here long enough not to question what you say
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Old 03-22-2010, 07:28 PM   #13 (permalink)
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I think I walked past 3-5 th400's (all 2wd) just lying in the gravel at the pull-a-part last week. Making me re-think 350/203/205 to 400/203/205.

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Old 03-22-2010, 09:41 PM   #14 (permalink)
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just make sure they are the short output/truck 2wd th400s. the older car ones can have 9" tail shaft and some are even 27spl [aka 375]
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Old 03-22-2010, 10:26 PM   #15 (permalink)
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just make sure they are the short output/truck 2wd th400s. the older car ones can have 9" tail shaft and some are even 27spl [aka 375]
I know for sure one was from a truck, the others I don't remember. Good to know though, thanks.
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Old 03-23-2010, 08:45 AM   #16 (permalink)
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Why do you HAVE TO HAVE the 700r4? you reading magazines telling you that you need a lower gear and an overdrive?.

The reason I'm mating a 205 to my 4L60 is because I'm doing a stright axle swap to my 2000 gmc Sierra 1500 with a right side drop d60. I plan on keeping the stock engine and tranny.
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Old 03-23-2010, 10:01 AM   #17 (permalink)
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The reason I'm mating a 205 to my 4L60 is because I'm doing a stright axle swap to my 2000 gmc Sierra 1500 with a right side drop d60. I plan on keeping the stock engine and tranny.
and how long do you really think this is gonna last?
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Old 03-23-2010, 11:16 AM   #18 (permalink)
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and how long do you really think this is gonna last?
What's that supposed to mean?
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Old 10-12-2010, 06:28 PM   #19 (permalink)
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The 700r4 after 1987 were good boxes.
I have a 72 K5 with a stock 350 and I beat he living hell outta that poor thing. TOwing trailers and screaming thru town on my way to the Pismo dunes.
If you're in these forums, you may or may not go out an buy things for your machine but then again you may build your own.
That desinegrates the "price of this over that" concern!
I have better performance and better mileage with the 700r4 and my 285.70R16 tires than I got with the TH350 OR the TH400 in this same truck.
ALsao just beciase the factory did it doesn't make it gospel or best. Billions of after market products and you and I have proved that.
Have fun with your life and your machine.
I just UPGRADED my engine to a 6.0LQ9 with the 700R4....guess what....? I'm UPGRADING to the 4L60E. Not because of hype, but because it's an UPGRADE over the TVC.
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Old 10-12-2010, 10:23 PM   #20 (permalink)
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Originally Posted by cartoonface;
I just UPGRADED my engine to a 6.0LQ9 with the 700R4....guess what....? I'm UPGRADING to the 4L60E. Not because of hype, but because it's an UPGRADE over the TVC.
You wanna cookie, or teeth to eat it with?

anytime someone tells me they want to upgrade by spending MORE money for a LESS reliable product... well, stupid is as stupid does. (not saying that the 4l60e is less reliable than a 700... we kinda knew that part...)

I guess since its your money, and you are dedicated to supporting the economy, youre a great guy. Not brilliant, but hey, at least you support the economy.
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Old 10-12-2010, 10:32 PM   #21 (permalink)
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I've had 2 4l60e's. One made it 98k before it started shifting rough. Pulled some GM warranty strings and got another and it lasted another 100,000 and then I sold the truck before it had a chance to die on me.
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Old 10-12-2010, 10:38 PM   #22 (permalink)
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I've had 2 4l60e's. One made it 98k before it started shifting rough. Pulled some GM warranty strings and got another and it lasted another 100,000 and then I sold the truck before it had a chance to die on me.
not discounting having a "factory" experience.

As far as use and abuse goes... the th400 is twice the trans, and half the price.

if you want mileage, drive a geo. if you want a transmission, get one that is strong enough for the application.

I can buy a th400 for 600 bucks, built the way it needs to be built, will hold up to at least 800 hp from a big block.

i guess i could try to buy a 4l60e and computer to accomplish the same, but i think the price would be somewhere in the neighborhood of 2000-2800 bucks.

2000 - 600...

wow.. save 1400 bucks....

a couple of years later, saved 2000 more because i didnt have to have my 400 rebuilt as its still together.

a couple years later... well, you get the idea.

how much gas will 2000 bucks buy?
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Old 10-12-2010, 10:44 PM   #23 (permalink)
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not discounting having a "factory" experience.

As far as use and abuse goes... the th400 is twice the trans, and half the price.

if you want mileage, drive a geo. if you want a transmission, get one that is strong enough for the application.

I can buy a th400 for 600 bucks, built the way it needs to be built, will hold up to at least 800 hp from a big block.

i guess i could try to buy a 4l60e and computer to accomplish the same, but i think the price would be somewhere in the neighborhood of 2000-2800 bucks.

2000 - 600...

wow.. save 1400 bucks....

a couple of years later, saved 2000 more because i didnt have to have my 400 rebuilt as its still together.

a couple years later... well, you get the idea.

how much gas will 2000 bucks buy?

Yeah I agree 100%, I'd never put one in anything else. I do have a th350 in the offroad rig, but it hasn't blown up yet and given me a chance to replace it with something better.
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Old 10-13-2010, 04:58 AM   #24 (permalink)
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4l60e's can be made to live, but it takes a very good (read expensive) builder to do it. my current one is living behind a 408ci lq9 with a decent shot of gas in my trans am, but it's the 6ths one it's had, lol. I was working at a shop and it was our test car for while. If you are serious about it, forget monster. go with someone like century, performabuilt, FLP, or Rossler. I've seen some of those last in low 9 second cars for a full season, which is saying something knowing the guys who were running them. I've also dealt with the warranty's offered through all of them besides FLP, and never had an issue. If i rip mine apart and do a big turbo setup, i'll swap it out for a th400. no way a 4l60e would live behind that setup, but its doing fine right now.
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Old 10-13-2010, 06:00 AM   #25 (permalink)
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ok ok i get it.

so, don`t bother with the 700. is 4l80 a swear word or what?
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