??? i want one for a back up in case my ever goes out :) thx

You might want to look in an old Chevy:flipoff2:

You know there is a WANTED board on the BBS.





FNG's:D

How about just about every junkyard in the country? Tried looking there? :flipoff2:

I want to know what happened that you think you need a spare. :D

Paul

I had spares once.. now piazza has one, and theres one in san diego... :D Maybe I shoulda kept just one for mockups

Originally posted by nasvik
I want to know what happened that you think you need a spare. :D

Paul


No shit! Those things are fawkin' tanks!

Originally posted by Josh 89XJ
Those things are fawkin' tanks!

I know! I've been moving one around my garage for a while now. Almost done with the rebuild................... :cool:

Paul

Originally posted by nasvik


I know! I've been moving one around my garage for a while now. Almost done with the rebuild................... :cool:

Paul

Not to get too off-topic from giving this guy shit, but how bad was the rebuild? I've never had the chance to do a tranny before and we were thinking of using an SM420 in place of the 727 on a friend's hybrid M38A1/DJ5/tube buggy. A few shops he called wanted way too much money, so I just started reading up on the rebuild process for them. Pretty easy?

This is my first tranny rebuild and it's quite easy. Got the rebuild kit from Novak and the instructions are awesome. A shop press, a puller or two, a dial indicator and various hand tools are what I've used.

I could be done with it in an hour, but I just dick with it for a few minutes and move on. :D I'm also going to add a reverse switch to it before installing.

Paul

My Garage....I have enough parts for two or three.....Just send me an Email when ever you need a part...;)

hehe 420:smokin:

fawkin newbies:rolleyes:

Hey, anyone got a spare Rockwell axle? I have 33" ATs and am afraid of breakage:rolleyes:

Why is it newbies fuck up every thread trying to be funny?:barf:

Trailhawg:fj:

I just finished rebuilding my SM420, super easy, and the first manual tranny I ever rebuilt, unfortunately, the relic I rebuilt was pretty beat up and it jumps out of 2nd a lot, I just got another one, so between the two I'll make one. Anyone who says that you can't break one isn't trying hard enough, and a spare is always a good idea, new parts for 30 year old trannies are hard to get.

As for Novak, I wish I would have bought a whole rebuild kit from them, I got a free kit that was missing a few things, but at least I had Novak's instructions with my adapter, they rule.

As for the reverse light switch, I came up with a slick little trick, I took the stock rev light switch out of my old AX-5 (should be the same as and AX trans) and low and behold, it has the same thread as an O2 sensor, so I bought a weld on O2 sensor bung, turned all but the last 1/4" of it down to 7/8" dia, knocked out the little steel plug in the top of the case in front of the reverse rail, drilled that hole out to 7/8" and tapped in the bung, tack welded it in, threaded in the switch, plugged it back into my stock harness, and tada! reverse lights, now if it would just stay in 2nd.

By the way, how come everybody just bashes anyone with a question, rather than posting helpful replies?

Originally posted by 4Bangler
By the way, how come everybody just bashes anyone with a question, rather than posting helpful replies?

Because it was a stupid question:flipoff2:

There are no stupid questions, just stupid people asking them, and everybody is born stupid, that's why we ask questions.

Since when is asking about parts a stupid question? It may be in the wrong topic, but from what I can see, nobody sticks to the topics anyway.

Originally posted by 4Bangler
Inow if it would just stay in 2nd.
This could be a shift fork Problem.....
Check for wear or possibly the wrong year shift tower....

Yeah, I thought the same thing, it got stuck in 3rd about three days after I put it in, had to pull the top dover to get it out, that may have been because I only had silicone for a gasket on the top cover, no gasket thickness, now I have the gasket and I will put it in when I get a chance. The shift forks looked real good, but as for the wrong year, you're right, it could be, most of the bolts were missing on the trans, and it had been laying out behind my buddies trans shop for as long as his boss remebers, but what do you expect out of a trans that cost a 30 pack of Millwakee's Best? I originally thought some of the new brass I put in the trans may be hanging up, but 2nd gear will work fine for 5 - 10 shifts, then it won't go in 2nd at all, or I will go ten feet or so in 2nd and it will jump out. the tallest gear on the counter shaft had some chipped teeth, looked like PTO wear, and the 2nd gear counter had some damage, I'm thinking it might be the gear damage, but that would not explain the intermittent problems.

As soon as I get a chance and some time I am going to search for a spare.. Its always good to have a spare tranny thats 30 years old..

I had a spare 300 too but now mike has that.

Originally posted by 4Bangler
There are no stupid questions, just stupid people asking them, and everybody is born stupid, that's why we ask questions.

Since when is asking about parts a stupid question? It may be in the wrong topic, but from what I can see, nobody sticks to the topics anyway.

I'll agree with this...

but (and that's a bigger butt than Oprah's), you need to keep things in context.

You don't go to a college calc class and ask how to do basic algebra, do you?

Come awn, people.... THINK! Look around you. Learn in the lay of the land. Lurk for a few weeks. Then, and only then, should be start posting.

Originally posted by 4Bangler
Yeah, I thought the same thing, it got stuck in 3rd about three days after I put it in, had to pull the top dover to get it out, that may have been because I only had silicone for a gasket on the top cover, no gasket thickness, now I have the gasket and I will put it in when I get a chance. The shift forks looked real good, but as for the wrong year, you're right, it could be, most of the bolts were missing on the trans, and it had been laying out behind my buddies trans shop for as long as his boss remebers, but what do you expect out of a trans that cost a 30 pack of Millwakee's Best? I originally thought some of the new brass I put in the trans may be hanging up, but 2nd gear will work fine for 5 - 10 shifts, then it won't go in 2nd at all, or I will go ten feet or so in 2nd and it will jump out. the tallest gear on the counter shaft had some chipped teeth, looked like PTO wear, and the 2nd gear counter had some damage, I'm thinking it might be the gear damage, but that would not explain the intermittent problems.
The chipped gears would just make it a noisy tranny... hmmm...sounds like some heat is building up on the shaft making the second speed gear synchronizing ring hard to shift after heating up...
When it won't shift to second have you tried shifting to first to see if the collar slides at all at that point?
First gear houses the second gear sychro so if it won't slide into first the sinchro is siezed to the shaft untill it cools maybe...
If it still slides into first then maybe there is another problem.

I guess I should ask this question...When it won't shift to second do you mean it slides but grinds or won't slide?

Okay, most times it wont even go into 2nd, I mean, it will physically shift into 2nd, but as soon as i let the clutch out, it jumps out of gear and grinds. 1st gear (creaper) works fine, as do both other gears, just 2nd. Once in a while I can get it to go into 2nd and it will be fine, some time for a quite a few stops and starts, but then it will run 2nd for a few feet and then jump out again. I don't think it's heat related, it seems to work just as shitty cold or warm.

What other tranny could give us so much fun huh?????!!!! I just got ahold of 3 more of these trannys all with the same number on the tower and all three when I swap to another box do something different.One locked the gears in 3rd by overtraveling the collar, the forks were different or something and another I have will bind up 2nd geasr synchro if 2 of the towers are on it and everything appears to be the same.
The 2nd gear popout is one of the most common problems with this gear box. I talked to an ag mechanic that has worked on these in farm trucks for some time and 3 and 4 will be like new and 2nd you can't even hold in gear with all of your might. That second gear takes all the grunt of start up with heavy loads. We have to remember that these boxes were put in 2 ton trucks!!!!
I would look for second speed synchro wear and or end play in the stackup of second gear on the output shaft. There is a thrust washer in front of 2nd that should only allopw .012 of end play within plus or minus .003.
Good luck to all of us ! This is an awsome tranny and I loved it in an older chevy that I drove around for about25 years.

:D

Either your second gear Dogs are completely warn down or you have the wrong year tower....
If your dogs are worn it will slip out of gear, you will need another second gear with better dogs.
If it's the wrong year tower the fork spacing is off and it is not fully engaging that gear.
I would pop the top and manually engage it Being completely sure the reverse gear Lever is tied off(neutral) and the third/fourth speed clutch sleeve is neutral.
hold the hold the brakes push the clutch and start the motor .....
release the clutch slowly to see if it pops out of second.
Of course you need to do this with the tower off so I wouldn't drive around;) ...If it don't pop out of second you will know you have the wrong tower.
-Kerry

I actually did that, took off in second in my driveway with the shfit tower off, got a nice 80w90 shower, and now my dash is all shiny, but stinky. It shouldn't be syncro wear, I put all new brass in, oh wait, I put two brass syncro's in, but that deal in the middle of the 1st gear assembly was sticking, I cleaned it up and it spun fine after, I never checked any end play, just kinda through it all together, didn't look like any way to go wrong, but I'm gong to pull it this weekend to see if I can find something. It could be the wrong tower, which would suck, I whipped up a sweet reverse light switch mount and welded it to this tower, but since it cost about $6, and took me a half an hour, I think I can do it over, maybe ever take some pics and do a write up.

This trans looks might molested, it was bolted to an old style mid mount crossmember, the one that attaches to the bellhousing, and the bellhousing had the wrong index bore, most or the bolts were missing, and the PTO cover looked to have come from a different source. The amount of wear on the PTO gear suggests that it may have run a PTO for a while. It's probably from a wrecker or something with 500k on it, damn, a 30 pack don't buy much anymore.