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Need help - NP208 speedo gear removal (read last post)

This is where I stopped yesterday.

th_P1200211.jpg


How does this thing in front of the shift fork come out? I already took the clips off the front and back of it.
 
With a broken gearset, you probably need a lot of parts - getting another case might be cheaper. It's not too hard to find a 208 and I don't see any reason for you to do a bunch of mods to fit something else. I would get another case and throw a quick rebuild on it before swapping it in. You would probably have a complete set of good bearings between the two cases and just need a set of fork pads.

The 241 is just slightly better in a couple of ways, but no big deal. If you find one for 700 and with the mechanical speedo, go ahead and run it. If you are interested in a slip yoke eliminator someday, this is the way to go. Otherwise, another 208 is pretty much as good.
 
Finally got a chance to get through tearing down the t-case while ago. Turns out, I didn't even have to take everything off the main shaft to get to the problem. I was having a hard time getting the synchro to come off, so I decided to knock the whole thing out so maybe I could get to everything easier. Wouldn't you know that the bearing for the input shaft had been broken when the planetary set blew up. All I had to do to get the planetary assy. off was knock it off the front end with some soft taps from a mallet. Bad news is that when I looked at where the input gear (I guess this is the sun gear) meshes with the planetary gears I could see that one of the teeth was on it was broken too. I guess the planetary gear that disintegrated broke off the tooth on the input that was touching it at the time. Maybe if I hadn't tried to give it a little gas to see if it would go back in gear then that wouldn't have happened. Anyway, there goes my bright idea of just swapping the input over to the 32 spline case. Bummer. Looks like I'm going to start shopping around for another case or at least a new input shaft, bearing and planetary assy.

This shows you how bad the planetary case was damaged:

P1220228.jpg
 
So, after seeing how well this case was damaged and how well shawn blew his 4l80e, you guys any relation? :D


Ive got an 89 241 sitting outside i may swap into the blazer someday. Just keep your eyes open, if i see more come online i know im gonna pick them up if they are around 100 since its a one year only thing. That and possibly more 90-91 241s and the vss speedos that go along with them for 5.3 swaps.
 
KansasTwister said:
So, after seeing how well this case was damaged and how well shawn blew his 4l80e, you guys any relation? :D


Ive got an 89 241 sitting outside i may swap into the blazer someday. Just keep your eyes open, if i see more come online i know im gonna pick them up if they are around 100 since its a one year only thing. That and possibly more 90-91 241s and the vss speedos that go along with them for 5.3 swaps.
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Yeah let me know if you find any. I'm sure this won't be the last case I grenade. I'm no relation to Shawn though. Least not that I know of anyway.
 
I might have a Chevy main shaft laying around and a planetary set. It would have the Dodge input gear, but you would still be a lot closer.
 
I think everything on the mainshaft is good except the input shaft, planetary assy. and input shaft bearing. Is the Dodge stuff compatable? 27 spline?
 
The planetary is the same, but the input spline is different. That gear is easily swapped between the two.
 
Blue85 said:
The planetary is the same, but the input spline is different. That gear is easily swapped between the two.
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Hmmm...I would still have to find an input spline then because mine is missing a tooth. Not on the spline part but on the gear part.
 
Look for a drivetrain shop you should be able to get a new input for about $76 that is what I paid for one from nogalitas gear in san antonio. Also make sure the needle bearing that goes between the input and the case did not shell it normally will go if the planetary explodes. As far as the planetary exploding it is not rare seen many of them. My best advance is to find a np241 because it is alot easier to work on and the planetary in it is bomb proof. I had one come in shop with zero oil in it because the rear seal failed all the t-case need was a new range fork, seals, and input bearing the rest of the bearings were smooth. That t-case is still in use today.
 
The planetary I have looks OK, but the input shaft is 23-spline. I forgot you were looking for the bearing, so I didn't look at that part. Let me know if I should check the fit in a flat-rate box.
 
conclusion (hopefully)

Let's bring this episode to a conclusion, shall we. I got a working t-case this weekend and hopefully I'll have time this week to put it in (if the weather will cooperate). It's funny how I came about aquiring this thing. I got a P.M. from a member on this forum named Fastmaxx (who has a really cool Blazer by the way) saying that he had a 27 spline 208 at his shop about 90 miles from my house that he wanted to trade for a 32 spline case. A couple of days after that I got an e-mail saying that the guy who had tried to sell me the 32 spline 208 from the military Blazer was wanting to get a used centerfire rifle. I just happened to have a .30-30 in my gun locker that I hadn't fired in about ten years. I called him up and asked him if he would take the gun for the t-case and he said yeah. Just so happens that his house was on the way to Fastmaxx's place, who happened to live right on the way to where my dad lives, which is where my transmission jack was at that I'm going to use to help put the case in the truck. So really all the new t-case cost me was about $50 in gas to go pick it up. I thought everything worked out good and hopefully I'll be up and rolling by this weekend. Thanks again to everyone who gave advice.

Blue85, how much were you wanting for that planetary set? I would like to get my old case fixed up so I can have it as a spare.
 
Oh, one more thing. How do you get the speedo gear out of the tailshaft housing? I want to make sure this case has the same one as my old one. I tried turning it clockwise and counterclockwise and pulling straight out on it but it won't come out. I'm pretty sure my old one had the stock gear but I don't know. Both of them have the same numbers on them, if that means anything. I think they are 41, 42 and 43.
 
Remove the bolt that holds the retainer in the side of the tail housing and then wiggle and pry the driven speedo gear assembly out. To get the drive gear off the tailshaft I believe you just pull it straight off the shaft, tailhousing removed of course.
 
496truck said:
Remove the bolt that holds the retainer in the side of the tail housing and then wiggle and pry the driven speedo gear assembly out. To get the drive gear off the tailshaft I believe you just pull it straight off the shaft, tailhousing removed of course.
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So I can just trade out the driven gear that the cable attaches to, right? No need to remove the housing to change it, I hope. Or would I need to change them both to get the right combination?
 
It depends on what ratio you need. The driven gear is simple to swap, but there are only so many tooth counts available. Did your speedometer read correctly with your old setup?
 
Dead giveaway would be the color of the drive gear on the output shaft. If the old t-case has a teal drive gear and the new t-case has a teal drive gear, no need to swap the drive gears. But you can't tell without pulling the driven gear and looking inside first. The driven gears are color coded in a similar way. If they are different colors then you should swap the old to the new if you want it to read correctly. Provided it was correct to start with...
 
Blue85 said:
It depends on what ratio you need. The driven gear is simple to swap, but there are only so many tooth counts available. Did your speedometer read correctly with your old setup?
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It was dead on, believe it or not. I checked it with my hand held GPS. When I first got the truck, it had 33s and was reading a couple of mph faster than what I was going. When I swapped to 35s, it was right. I think the PO must not have swapped the speedo gears when he changed the axle ring and pinion gears. I think they're 4.10s.
 
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