NP203 HELP please....

[oneluckypops]

I am not 100% positive, but those are interchangeable are they not? I know the 208 comes both ways, manual or electonic. What part goes on the 205 output shaft that the electronic sensor reads? Isn't like a notich in the shaft and the sensor counts the notch everytime I comes around? Or maybe a magnet in the shaft. I am green on that stuff, but you're right, I forgot about the 400 and 4L80-E being a match. But not all 4L80-E have the same pattern do they? Interesting. I'll look into and see. Or for what you're using the truck for, you don't need the 205 for strength, but having the deeper crawl ratio might benefit you better, so maybe I need your 205.

Speed sensors are magnetic, the output shaft has a reluctor ring on the shaft with notches in it. Everytime the notches pass the magnet it counts and the computer will translate the counts to RPM and MPH. The 205 doesn't have any reluctor ring and to mu knoledge was never used with a electric speed sensor only cable driven. However there are aftermarket converters that you screw into the case then the cable to the converter. There have been people adapt a speed sensor to a 205 but its not worth the trouble for me right now.

 

[GreaseDog]

I am not 100% positive, but those are interchangeable are they not? I know the 208 comes both ways, manual or electonic. What part goes on the 205 output shaft that the electronic sensor reads? Isn't like a notich in the shaft and the sensor counts the notch everytime I comes around? Or maybe a magnet in the shaft. I am green on that stuff, but you're right, I forgot about the 400 and 4L80-E being a match. But not all 4L80-E have the same pattern do they? Interesting. I'll look into and see. Or for what you're using the truck for, you don't need the 205 for strength, but having the deeper crawl ratio might benefit you better, so maybe I need your 205.

the 208 was never available in electronic. starting in 1988 the 208 was replaced with the NP241, and for 88 and 89 it retained a cable driven speedometer. for 1990 and 1991 they got an electronic speedometer drive... rare as hen's teeth, and highly sought after by guys looking to put a straight axle under a GMT400 truck and keep the factory speedometer intact and working (which is why i have one).

the late NP205s (90/91) had a reluctor wheel in the place of the speedometer drive gear, and a VSS replacing the driven gear. the most highly sought after trans/transfer case combo is the 1991 only 4L80E/NP205 combo.

all TH400s and 4L80Es have the same 6 bolt pattern at the tailshaft, and the same diameter 32 spline output shaft. the shaft is the difference in some, if not all.

 

[oneluckypops]

the 208 was never available in electronic. starting in 1988 the 208 was replaced with the NP241, and for 88 and 89 it retained a cable driven speedometer. for 1990 and 1991 they got an electronic speedometer drive... rare as hen's teeth, and highly sought after by guys looking to put a straight axle under a GMT400 truck and keep the factory speedometer intact and working (which is why i have one).

the late NP205s (90/91) had a reluctor wheel in the place of the speedometer drive gear, and a VSS replacing the driven gear. the most highly sought after trans/transfer case combo is the 1991 only 4L80E/NP205 combo.

all TH400s and 4L80Es have the same 6 bolt pattern at the tailshaft, and the same diameter 32 spline output shaft. the shaft is the difference in some, if not all.

Well all be damned I didnt realize the 205 ever had a SS. I thought they quit using the 205 at the same time they started with the 208's. Learn somthing new everyday.

 

[GreaseDog]

Well all be damned I didnt realize the 205 ever had a SS. I thought they quit using the 205 at the same time they started with the 208's. Learn somthing new everyday.

starting in 1981 the NP205 was 1 ton only... and for whatever reason, the only way you could get anything other than an NP205 was in a military spec 1 ton. seems that they went top of the line on everything else, why not opt for the stronger 205 there too? instead, most of them came with an NP208. i don't remember if it was the M1028 or the M1031 that came with a 205 in it.

 

[HotRodPC]

starting in 1981 the NP205 was 1 ton only... and for whatever reason, the only way you could get anything other than an NP205 was in a military spec 1 ton. seems that they went top of the line on everything else, why not opt for the stronger 205 there too? instead, most of them came with an NP208. i don't remember if it was the M1028 or the M1031 that came with a 205 in it.

Yep in years 1973 and 1980 only, all squares came with an NP205. Didn't matter K10-K30, or auto or manual trans.
In 74 only Inline 6 models came with NP205 (Really doesn't make sense to me.)
and everything else got NP203.
In 75-79 all manual trans got NP205 no matter the motor or K10-K30, and all Auto trans got NP203.
Again all 1980 models got NP205
Then you are correct. 81-87. K30 got NP205 no matter the powertrain, and K10-K20 got NP208 no matter the powertrain.
You're right on the CUCV's too. Of all the good **** they put in a CUCV, the stronger rear ends, lockers, Th400 etc, then they put in an NP208.

Apparently, the NP205 is not designed to be shift on the fly but the NP208 is. Maybe they wanted shift on the fly. Even with shift on the fly, its still done at a lower speed and only to 4HI of course. You'd still have to stop and go into N before shifting to 4Lo. I think I could really get by without shift on the fly.

 

[crazy4offroad]

NP205 can shift on the fly. But it's more of a "powershift", where you let off the gas, time it right, pull back on the stick to grab 4-Hi. You can also do the same to go back into 2-Hi.

 

[oneluckypops]

NP205 can shift on the fly. But it's more of a "powershift", where you let off the gas, time it right, pull back on the stick to grab 4-Hi. You can also do the same to go back into 2-Hi.

Yep My shifter on the 79 I was always able to shift it in 4X4 Hi while driving, Even at 45-50 mph I never ground any gears. It always went right it. Maybe it depends on how well your shifter is lubricated

 

[89Suburban]

 

[HotRodPC]

NP205 can shift on the fly. But it's more of a "powershift", where you let off the gas, time it right, pull back on the stick to grab 4-Hi. You can also do the same to go back into 2-Hi.

Yep My shifter on the 79 I was always able to shift it in 4X4 Hi while driving, Even at 45-50 mph I never ground any gears. It always went right it. Maybe it depends on how well your shifter is lubricated

I know there are some "shift on the fly" Tcases out there, that I refer to as "Shift on the FRY " Totally sounds like you are fuggin them up and griding off a pound when you shfit them while moving. Talking about the 4 letter F word brand.

 

[GreaseDog]

there's no grinding with a sharp quick pull on the shifter. mine is constantly in and out of 4wd when plowing, never had an issue.

 

[HotRodPC]

the 208 was never available in electronic. starting in 1988 the 208 was replaced with the NP241, and for 88 and 89 it retained a cable driven speedometer. for 1990 and 1991 they got an electronic speedometer drive... rare as hen's teeth, and highly sought after by guys looking to put a straight axle under a GMT400 truck and keep the factory speedometer intact and working (which is why i have one).

the late NP205s (90/91) had a reluctor wheel in the place of the speedometer drive gear, and a VSS replacing the driven gear. the most highly sought after trans/transfer case combo is the 1991 only 4L80E/NP205 combo.

all TH400s and 4L80Es have the same 6 bolt pattern at the tailshaft, and the same diameter 32 spline output shaft. the shaft is the difference in some, if not all.

I knew that. I was thinking of the 241C and probably the 90-91. I know when I was selling a cable driven 241C I have everyone and their mother asking that wanted to buy it. And that is what Pops needs for his Vortec conversion.

 

[HotRodPC]

Pops, did you just try calling? To much Hookin and Bookin, and I was Snoozin and Cruzin tonight. Scared the **** outta me. I did make it home, but I went straight to bed for a nap incase the phone rings again. Sumbish, I was doing 75 in a 60 with the cruise set and I bet I was asleep for at least 1/4 mile. I woke up going for the center cable barrier and scared the **** outta me. I had to change underwear and wipe before I crashed. I got about an hour nap. Need to crash hard and get caught up on sleep.

 

[oneluckypops]

yea I tried to call you twice ******. I guess you to good for me now huh lol

 

[oneluckypops]

I knew that. I was thinking of the 241C and probably the 90-91. I know when I was selling a cable driven 241C I have everyone and their mother asking that wanted to buy it. And that is what Pops needs for his Vortec conversion.

Pops has already gotten his 241C Transfercase for the conversion. All I am lacking now is the parts listed earlier and TIME. Looks like its back to hauling 7 days a week for the next few months. Oh well be some decent pay checks.

 

[HotRodPC]

yea I tried to call you twice ******. I guess you to good for me now huh lol

Nawww, not to good fugger. Just needed some damn sleep. And I can't silence my phone when I need sleep since I never know when I get a tow call. My phone does talk though, so anything other than hearing DISPATCH before it starts ringing I try to stay asleep and ignore it. I heard 6 6 0 ..... and thought wtf is 660 area code. Then I couldn't go back to sleep and ended up getting up.