Chrysler A604 differential pin

billr

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#1
I didn't want to hijack the other thread for this, but would like to know more about this. Is that the spider-gear shaft that gets loose? What is there to keep it retained? This sounds exactly like what can happen on S-series Saturns. Those have a split-type spring pin to hold the spider shaft, not locking screws like I am familiar with. The best fix for the Saturns seems to be drilling everything over-size and using a spiral-type spring pin. When I first heard about this in the Saturns I was amazed, as I had never heard of spider shafts coming loose before. Now there are two different transaxle designs, by two different manufacturers that have this defect???
 

nickb2

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#2
@bill, small bolt that holds the said diff pin shears ouch. Up here, when on ice, happens all the time, have seen holes as big as tennis balls. It just depend on where it hit the casing. Like I said, have seen one flame up, actually melted the intake plenum, van was toast :ROFL

When I was up in quebec city for dodge, we had a freight container full of tranny cases every week. A known problem with these vans. Here is a video I found on youtube, a short one but shows what I think maybe happened in the other thread. http://youtu.be/hhN3AqY3ny0 In this case, the case :ROFL can be welded, but often, cheaper to put in a other tranny.

These types of differentials do not have split type retainer for said pin. Will post back for your saturn model. :thx
 

billr

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#3
Is there a fix for those Mopars, like a larger screw? From what I read, the problem in Saturns is also related to spinning wheels in ice/snow. No problem for me!
 

bp042665

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#4
there is a company that makes a fix for this you take out 2 carrier bolts and put this bracket thing in there so if it shears off the spider pin cant come out i think Fix All makes it I'll check
 

billr

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#6
If I ever have one apart I'll drill for the larger and stronger pin, welding would be my last choice. It really hasn't been an issue for me, no wheel spinning here; we hardly even have rain!
 

nickb2

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#7
:ROFL you can't drag race with these cars or vans :p

I have told many client with the minivans, no american stops. The TCM and solenoid pack needs time to compute. On the 3 speed not so much of a problem. I have seen the 4 speeds do good km's if client stops and go after TCM resets. They complain oftain of a clicking sound. Totally normal!! It is the solenoid pack. These leak fluid also, there is a newer part, gasket and aluminum plate for these models, just need to make sure those 10mm bolts are not over torqued. This engineering problem almost brought chrysler to it's knees :thx $$
 

jasonn20

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#8
nickb2 said:
:ROFL you can't drag race with these cars or vans :p

I have told many client with the minivans, no american stops. The TCM and solenoid pack needs time to compute. On the 3 speed not so much of a problem. I have seen the 4 speeds do good km's if client stops and go after TCM resets. They complain oftain of a clicking sound. Totally normal!! It is the solenoid pack. These leak fluid also, there is a newer part, gasket and aluminum plate for these models, just need to make sure those 10mm bolts are not over torqued. This engineering problem almost brought chrysler to it's knees :thx $$
The a604 transmission is not too bad of a transmission and yes I have seen alot of them at the trans shop i work for but you have to consider how many millions of these transmissions they have made as they put them into most of there front wheel drive vehicles for the last 15 years or better. The computers communication on a crysler is usually slower than others but it has adaptive learning on the trans which is almost ahead of it time. The clicking is from the splines getting worn at the wheel hub and axle end. The revised solenoid block discards the steel seperator plate and sound blanket. These transmissions can last 200k+ if taken care of and driven with some common sense. Yeah the solenoid block will probably need to be replaced as well as the rubber cooler hose that dry rot but it is not that bid of a deal to replace. What almost sunk crysler was them using mitisbitsi engines.
 

nickb2

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#9
@jasonn, I am starting to like you ;D. Wanted to reply here, about Mitsubishi engines. Had a eagle talon and drove that on the strip for a while. :eek: Great looking car and felt like I was in a cockpit when getting into it :ROFL. I could spin wheels even in 4th. Obviously I modified it 8)

So not to get ahead of myself and not abuse English language, just want to know, what is your recommendation for fluid intervals on these trannys? I use valvoline or castrol, but do not recommend to much service. I have seen clients do flushes, and scrapped tranny on these models.

I am not a transmission specialist, so I like it when I can learn more, cuz there are a ton of them still on the roads and still running. THX for response :thx

Not my writing, so here is a quote

Chrysler did not make it easy either, especially during the 1990s, Chrysler was one of many sources of misinformation reguarding what fluid to use. In 1990 the factory service manuals (FSMs) said that ATF3 was optional and that it did not need to ever be replaced for the life of the transmission unless the vehical was used in fleet service. DON'T BELIEVE THIS.

Here is a link I read while pondering all this mess :p http://dodgedynasty.50megs.com/a604/fluid.html Very informative but could always use second or third opinions.
 

keith

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#12
The most common fix for the chrysler trans is to weld it. I have also seen it in the saturn but not as much. Really no reason not to weld it. The diffs very rarely have problems, I have never seen one. Even if you welded it and the diff goes bad these trans are a dime a dozen, literally millions of them. Probably a thousand in junk yards within 100 miles of me. Weld it and dont worry.
 

nickb2

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#14
bp042665 said:
i spot weld it in on both sides
Agree, and quicker too. More permanent. On the saturn's could probably do it through vss hole in five minutes, just need a hose close :ROFL

Still raining, can't get a break. :thx