C6 with NP208
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From: Da UP, eh!
C6 with NP208
I have an '88 Bronco that I use for plowing snow. When plowing late last winter, I was in reverse, then when I dropped it into Drive, there was a clunk and that was it. No more forward or reverse. There was a sort of grinding noise that sounded like if you put a playing card on your bike and it flicks across the spokes of your wheel. The engine was running fine, but no engagement. I took both the transmission and transfer case out, and now I'm preparing to figure out what is wrong. Any ideas? Would it be the tranny or the x-case? What would you look at first?
Can a transmission shop take a transmission and do some bench type tests on it to see if it is the transmission before I take it all apart? Or do I have to just dig in and tear it all apart and look for a problem?
Can a transmission shop take a transmission and do some bench type tests on it to see if it is the transmission before I take it all apart? Or do I have to just dig in and tear it all apart and look for a problem?
Transmission Rebuilder
Joined: Jul 2008
Posts: 1,570
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From: North Georgia
The clicking noise that you heard was it in park?
Assuming that the trans and transfer case are separated.
I would put the trans in park and see if the output shaft will lock and not turn.
Turn the input shaft on the transfer case and see if the output shaft for the rear drive shaft turns.
Remove the converter and check for damage on the converter hub (pump failure).
Assuming that the trans and transfer case are separated.
I would put the trans in park and see if the output shaft will lock and not turn.
Turn the input shaft on the transfer case and see if the output shaft for the rear drive shaft turns.
Remove the converter and check for damage on the converter hub (pump failure).
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From: Da UP, eh!
No, the clicking noise was when I put it in drive and after I heard the clunk, it started to make that noise, like it was trying to engage, but didn't. Even in reverse. You could hear the engine going, and it was like the crank was spinning but not engaging.
Yes, the tranny and x-case are seperated right now, both out of the truck. I will see if I can put it in park on the bench and try to turn the shaft.
I just took the x-case apart and everything appears to be working fine. I tried it in all modes, Neutral, 2Hi, 2Lo, 4Hi, and 4Lo and all the gearing works well in the x-case, so I've narrowed it down to the tranny anyway.
What is the converter? The section on the end of the tranny that bolts to the x-case?
Thanks!
Yes, the tranny and x-case are seperated right now, both out of the truck. I will see if I can put it in park on the bench and try to turn the shaft.
I just took the x-case apart and everything appears to be working fine. I tried it in all modes, Neutral, 2Hi, 2Lo, 4Hi, and 4Lo and all the gearing works well in the x-case, so I've narrowed it down to the tranny anyway.
What is the converter? The section on the end of the tranny that bolts to the x-case?
Thanks!
Post Fiend
Joined: Jun 2002
Posts: 13,873
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From: Atlanta GA
> there was a clunk
> What would you look at first?
Since you do not see anything obvious, the clunk can be the rear end breaking. I would jack up the rear and see if the wheels turn at all when you turn the pinion, then hold a wheel, and see if the other spins. Repeat for the other side.
Where you able to move the vehicle in 4x4 with the front axle pulling?
Test the transfer case first, the NP208 was been know to break under hard use, that is more likely then the C-6.
I would look in this order
1) rear end
2) np-208
3) torque converter (especially since you heard that clicking sound)
4) c-6
> What would you look at first?
Since you do not see anything obvious, the clunk can be the rear end breaking. I would jack up the rear and see if the wheels turn at all when you turn the pinion, then hold a wheel, and see if the other spins. Repeat for the other side.
Where you able to move the vehicle in 4x4 with the front axle pulling?
Test the transfer case first, the NP208 was been know to break under hard use, that is more likely then the C-6.
I would look in this order
1) rear end
2) np-208
3) torque converter (especially since you heard that clicking sound)
4) c-6
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From: Da UP, eh!
Yeah, I guess it could be the rear end breaking. When I got the truck it was blown, so I put in a new set of gears in the rear.
I'll also put the rear end up and do the tests you suggested.
As I said, probably when you were typing, that the transfer case appears to work very well now that I took it apart and checked it all out.
Stupid me, I understand...converter = torque converter. It all looks good from the outside. Any way to test it on the inside? By the way, how does a torque converter work?
I'll also put the rear end up and do the tests you suggested.
As I said, probably when you were typing, that the transfer case appears to work very well now that I took it apart and checked it all out.
Stupid me, I understand...converter = torque converter. It all looks good from the outside. Any way to test it on the inside? By the way, how does a torque converter work?
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
Had the same thing happen with the same setup in my 84 F250, it was the t-case. The NP208 has a plastic shift collar that a steel fork rides against to shift between high and low ranges. Before taking it all apart, you should have tried moving it from high to low to see if it would have engaged at all. Doing this, I'd get about 50ft and then mine would pop back out.
That was my second NP208 in that truck- The first had the same thing happen on the highway, but the fork caught the snap ring just right and launched it out the side of the case.
That was my second NP208 in that truck- The first had the same thing happen on the highway, but the fork caught the snap ring just right and launched it out the side of the case.
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From: Da UP, eh!
Update...put the rear end up and spun the tires as suggested. Everything checks out good.
Transfer case is back together, looking fine.
Buddy across the street came over, and we put the torque converter back on the tranny and it spun really freely and made a little noise too. He thought that was not right. He said torque converters should have resistance to them and this spun like a bearing. Thoughts? Could that be the culprit?
Transfer case is back together, looking fine.
Buddy across the street came over, and we put the torque converter back on the tranny and it spun really freely and made a little noise too. He thought that was not right. He said torque converters should have resistance to them and this spun like a bearing. Thoughts? Could that be the culprit?
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Hotshot
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