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Well, I think my bearing are starting to scream at me to change them in my transmission, it makes this Wirr/whistle sound at 54mph and 59mph in 5th gear and you can still hear it in lower speeds. I've coasted w/ the motor off and going down the road and putting it into 3rd-5th checking to see if it was gear specific it wasn't and didn't make a sound with the clutch in, so i put it in neutral and let off the clutch, it sounded like the input shaft was engaging crooked and you could feel it vibrate a little(seems like a pilot bushing problem too eh?), every once and again it wouldn't make anynoise. So how do you change the bearings for the input shaft for this thing? I've looked at my spare trans and it looks like there's some sort of cover that slides over the shaft and might support the bearings for the input and mainshaft's, do I just take off the cover and pull out the bearings? I was thinking since the internal's of the gas and diesel 5spds are the same then maybe 800xl should have some info on this.

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-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras 00' Civic beater...

Well, I'm going to see If I can put my truck on a lift or jack stands and put the back wheels up to speed and see if it's my drive-train, cause It may just be my tires.

Doesn't anyone have any info on how to change some of these bearings?

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-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras 00' Civic beater...

Finalman--

My '84 Isuzu manual has a nice blow-by-blow instruction on disassembly and reassembly of the transmission. Mostly requires hand tools except for a press and bearing separator for some of the bearings.

Paul

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'84 Isuzu diesel P'up

Sorry I missed this one the first time around. I've never had a trans apart to say for sure. I recall that the book details disassembly as starting at the front though, so you should be able to get at the input bearings without tearing open the trans stem to stern.

The blow up in the parts book does show a front cover with a seal and some other parts along with the input shaft bearing. From the pics it looks like you should be able to change out the front bearing and seal without tearing into the trans much at all.

Just some other thoughts on your symptoms: Pilot bearing tend to make themselves know with the clutch pedal pushed in. With the clutch out the inner and outer races of the bearing are turning together along with the shaft, no movement relative to each other. If it were going to make noise, I would think you'd pick it up only when you pushed in the clutch. Throwout bearings going out have tended to be the same for me, only made a peep with my foot on the pedal. Other causes I can think of would be an out of balance clutch disc, maybe worn funny or a damper spring out of place? I dunno. Sounds more likely it would be something in the rear end, u-joints or something more like that. Ever hear a slight clink noise on take off? My 77 did that for a while before the ujoints went on it.

Be careful on those jackstands and hope you track it down.

Actually we just replaced both U-joints about 700 miles back, but my dad and I started thinking on when the problem started and I actually noticed it after I changed my gear oil in the rear end, the first saturday I changed it I started at mobile1 75w-90 then some GM Grape stuff 75w-90 the next saturday and then another round of that 75w-90 grape stuff then next saturday. So every saturday of a three week period I changed it three times so it would get into the bearings and get the crud out of them to ensure they were nice and clean.

You mentioned the clutch which reminded me of something. I used this http://www.xse.com/leres/bin/gearratio?title=SS+%23670+with+MM6+manual+and+GU6+3.42+gears&rpm=4300&mph=45&gear1=4.13&gear2=2.50&gear3=1.48&gear4=1.00&gear5=0.86&gear6=0.50&reverse=3.76&axle=3.73&tire=diameter&diameter=25.50&circumference=80.11
to figure up the maximum speed for each gear to see if my dad's owner's manual was correct or not (should be if it's an owners manual )
The manual says, "For normal acceleration, shift into the second gear at about 15mph, into the third gear at about 25mph into the fourth gear at about 40mph and into the fifth gear at about 45mph."
It also listed the maximum speeds for each gear.
1st :20mph
2nd :30mph
3rd :50mph
4th :75mph
So while in my truck I have been trying to get to 15mph to shift, but it won't go any faster than about 12mph in first gear, could the clutch be the culprit to the speed issue? And could it be the new gear oil that's making the whistle noise? My tires maybe?

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-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras 00' Civic beater...

800xl & Finalman--

Re the tranny disassembly. Unfortunately, the transmission must be totally disassembled to get the input shaft bearing off. This is because one cannot get the input gear past the front countershaft gear to remove the input shaft.

Here is a shot of one I worked on: (click on the image to enlarge)




Re the whistling noise. Could be a bearing but also could be something else like and exhaust leak or a tire whine.

Paul

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'84 Isuzu diesel P'up

From the exploded diagram it looks like you could remove the bearing and seal without removing the shaft though. It just looks like you can take that front plate off and the bearing would slide off the shaft to be replaced. It is really hard to tell from those diagrams though, I've been fooled by them a number of times before.

Trans dissassembly has never been high on my to do list, I've always just had enough spare parts to keep me going. That and I've never managed to blow up a trans. <knock on wood>

800xl--

Yes it does look like the bearing should come off the input shaft. And it would except that it is pressed on and there is no way (I know of) to get a hold on the bearing while it is inside the case to pull it off.

And if you could manage to remove the old bearing you would still need to install a new bearing by pressing it on the shaft.

I have removed the bearing with a press and bearing separator after I have the front shaft assembly free of the other parts.

A total teardown is not too bad a job and might just be a good idea as the front bearing is not the only one which gets bad.

Paul

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'84 Isuzu diesel P'up

Father-in-law used to have a diesel Pup, and his tranny also died, before the truck did. He had a hard time finding parts to fit, though I remember him saying the Chev transmission internals would fit..???
Not trying to offend anyone, but I'm glad mine has the Borg-Warner T5 tranny. Not only do they seem to last, if they do fail, getting another one is easy. I am running one now out of a 1988 4 cyl gasser. Fit right in.

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Bona Fide diesel fanatic.
1994 Chev S10 Ext Cab Isuzu Diesel 5spd
Kubota B6100 HST diesel

Well, last night I came in my neighbor hood and put it in 4th so I could slow down on a hill and not be as loud (stupid flowmaster....) and it makes this odd sound like metal's beating around... so he told me to give him the keys to my truck and he'd drive it for a while and see what was wrong with it, he said there was a different sound he heard in 4th gear and that my rear end was making a little too much noise. So since my dad has this whole week off to do what he pleases he decided to pull my trans and see if the spare we have works good enough to use, so he gets the truck on jacks and he checks the rear end first, it's horrible! We had one wheel off the floor and turned it and the diff. made the oddest sounds you ever heard.... so that's gonna get fixed with new bearings, or I'll get a 3.4_ to put under it from another luv.* Then he gets the trans out and puts it side-by-side with the "new" one. And i wiggled the input shaft of the "new" one, not much wear in the bearings (not even a milimeter) but I wiggle the input of the old one and it's about an 1/8th of an inch slop in it!!! So I guess my dad will put the new on in tomorrow and we'll see about a rear end another day, but for now the LUV is parked and I don't know how i'm going to pay for my senior project!!! (restoring the interior of my truck)

*BTW, can I just take the speedo connector thing from a 4spd trans and put it on a 5spd and it will read as though I still have the stock 3.73 under it?

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-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras 00' Civic beater...

If hw's just swapping out third members, it's a pretty quick job. I had mine out one day after work and in the next. Most of the delay was in running all over town for seals, cutting a pumpkin gasket, and finding that last bolt that always seems to disappear. All told, I think the third member was easier than a tranny swap. From what you said, you need both, but since he's got the whole week off, you might as well put him to work!

You might can stretch out the rear by retorquing the pinion nut, but once it has gotten sloppy and run that way the pinion bearing and likely the gears will be worn. My 76 used to loosen up on its own so I just got in the habit of pulling loose the driveline and retorquing the nut every 6 months or so. That same rear is in my 77 now, about 10 years later.

Well, we have the trans put back together, but one of the gaskets b/w the middle cast-alm. was so torn up we couldn't re-use it, so we just used silicone. When we assembled the whole thing and spun the input shaft it would turn, then it seemed like it hit a rough spot, I kept telling my dad it needs to have oil put in it and the bearings probably need to be broken in or something. Well he's courious so i'm asking on here what the problem could be. I'm still sticking with my theory on needing to be broken in.

_________________
-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras 00' Civic beater...

I hate to tell you, but bearings should turn freely, and don't need breaking in. Some applications require bearings to "settle" in, like when you replace wheel bearing on a trailer or the front wheels of a RWD vehicle. It sound like you may have something in one of the teeth on the transmission. When you turn it to this point, the teeth can't mesh smoothly t due to the foreign matter between the teeth, so it gets stiff to turn.
Crap in the bearings will also give this same effect (dirt, bits of gasket, metal filings, etc).
I can't help but wonder if the missing gasket is the culprit. With some various asseblies, as I've seen with other transmissions and motorcycle engines, the thickness of the gasket acts like a shim, so without it you are bringing everything that much closer together, which it wasn't designed for.

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Bona Fide diesel fanatic.
1994 Chev S10 Ext Cab Isuzu Diesel 5spd
Kubota B6100 HST diesel

Great, more money to spend, I jsut got back from my dad n' I driving the truck with the 3.42 rear under it and new trans bearings. It doesn't whistle anymore.... it "whoooo's" at certain speeds, plus while we were bleeding the brakes they slowly bled down, and while riding around the pedal goes to the floor and the brake light comes on. So now my dad says I need a new master cyl. and we need to find out the source of the whhoooo sound. ANYBODY have a clue as to what's going on here? I'm about tired of this money pit truck of mine, yeah I love it, but all this crap, U-joints, trans bearings, rear axle, rotors, etc... it's starting to get to me. Any hints to why the noise is happening would be well appreciated.

_________________
-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras 00' Civic beater...

Welcome to owning an older vehicle. That's the joy of owning something new, if you can afford it (that leaves me out! )..."Yea, this broke on it's own. Fix it please, and I'll take a loaner car home, thank you."

My warranty is whatever ambition I can muster up to go out into the unheated garage, gather a bunch of cold tools and fix the truck or car.
Been doing it for years.

Why?

Beats the CRAP out of me!

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Bona Fide diesel fanatic.
1994 Chev S10 Ext Cab Isuzu Diesel 5spd
Kubota B6100 HST diesel

My warranty is whatever ambition I can muster up to go out into the unheated garage, gather a bunch of cold tools and fix the truck or car.
Been doing it for years.

What, no puddles or ant trails to lie in?

Here's what the old 3.73 was doing:
http://media.putfile.com/old-373
Here's the "new" 3.42:
http://media.putfile.com/new-342

_________________
-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras 00' Civic beater...