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Trnasmission

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JRT

10-04-2001 19:07:02




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My mechanic (who I trust) suggested I consider a "solvent flush" if I intended to keep a vechicle over a couple of years. He said the transmission fluid was slightly burnt. His experince is it is best to leave the fluid in as the usual transmission fluid change does not get it all out and the mix of old and new fluids seems to lead to a higher risk transmission slipping in the next 6 months or so. He says what is now being done is a "solvent flush", which uses a machine to pump out the old fluid, circulates a solvent which cleans out any varnish, cleans filter, etc, and then flushes out the solvent with fresh fluid. He says his experience so far has been good. It is not something he is set up to do. Cost is around $125 to 150.

Has anyone heard of this? Anything to it?

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George

10-06-2001 19:10:59




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 Re: Trnasmission in reply to JRT, 10-04-2001 19:07:02  
How did the fuild become burnt in the first place?
Overheating the trans buy over loading or low fluid level will kill it fast.
My trans guy explained to me that when the fluid is burnt that an acid is created durring the overheating process. This in turn attacks the clutch fiction material so you fluid looks burnt as the clutches break down.
If it smells like rotten eggs it is burnt.
I have not yet experienced a failed trans, as a precaution I have added a trans cooler to my vehicules with auto trans an keep up on my maintence. I have been using "Fluidyne" coolers rated for 20000lbs. I'm sure that others make some that are just as good, but this design is compact for the cooling rating it has from the factory.
They are intalled on my 1969 caddy 89,000mi and my 1992 F-150 ford with 215000mi.
The ford has once pulled 14000lbs from western PA to NH and has not given me any trouble. And yes this is WAY over what the truck is rated for But we all know the the saying "If you have already come half way then its the same if you turn around now or go the rest of the way." The point is; keep the fluid from over heating in the first place and if you think there is a possibility you may over load on occasion an trans cooler is cheap insurance.
Good Luck.

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JRT

10-08-2001 05:29:25




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 Re: Re: Trnasmission in reply to George, 10-06-2001 19:10:59  
The vehicle (95 Aerostar van) has trailer tow package with transmission cooler- but is rarely used for towing. It has 130,000 miles on it. I asked about why the fluid would be burnt- but recieved no specific answer, other than age and stop and go driving. We have not been having any problems with the transmission.



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VaTom

10-08-2001 17:35:30




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 Re: Re: Re: Trnasmission in reply to JRT, 10-08-2001 05:29:25  
This sure sounds familiar. Our Aerostar was a few years older. Had the transmission rebuilt by our faithful rebuilder. Got another 40,000 miles. He and the scrap yards warned me that they were junk. The rest of the van (with a strong engine) got turned into a power plant. No point in throwing more money into crappy transmissions. I hope yours was better designed. We went to full-sized vans.

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RandyB

10-06-2001 14:00:40




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 Re: Trnasmission in reply to JRT, 10-04-2001 19:07:02  
Go ahead and change the fluid and add a product name Lubegard to the transmission.
Lubegard



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keith

10-06-2001 11:44:51




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 Re: Trnasmission in reply to JRT, 10-04-2001 19:07:02  
Drop that pan, install new filter and new fluid, drive 150 or so miles and repeat but refill with Amsoil Synthetic ATF. Only the best will do and Amsoil is still the best. email me for customer order #. Keith



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PowerMan

10-05-2001 20:06:53




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 Re: Trnasmission in reply to JRT, 10-04-2001 19:07:02  
How I do mine is disconnect the return line from the oil cooler to transmissoin at the transmission end, slip a hose over the removed line and put it in my drain pan. Then refill transmission with new oil and start engine with transmission in neutral and let the new oil be pumped through the torque converter, oil lines, oil cooler and into my drain pan. I can tell when the new oil starts coming out the hose and into my drain pan. Then shut off engine, reconnect oil cooler line and refill transmission to correct operating oil level. (my MoPar (Chrysler / Dodge) trannys need to be in neutral for the oil pump to pump oil throughout the system)

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RayP(MI)

10-05-2001 19:20:39




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 Re: Trnasmission in reply to JRT, 10-04-2001 19:07:02  
How about changing the fluid, driving it a few thousand miles, and changing it a second time (or even a third?) This should remove all but a small amount of the old fluid. Be very careful about removing the bolts from the oil pan on the bottom. I recently did a change on my GM truck, and broke off 4 bolts. All 4 were screwed into holes that were open at the top, and were apparently corroded from the top. No, I didn't manage to get them out - they were stuck too well - eay outs, etc weren't any help. I put a drain plug in mine for future changes!

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Ken

10-05-2001 17:19:39




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 Re: Trnasmission in reply to JRT, 10-04-2001 19:07:02  
About 1/3 of the old fluid stays in the torque converter. 2/3 new is WAY better than all old. I always say change the fluid and if the transmission actually fails, it was due to strand you any day anyway. Doing a fluid and filter change has brought two transmissions with slipping reverse (GM) back from the dead for me, and they are 1/3 the cost of that "do all" flush job.



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Tyler(WA)

10-05-2001 09:11:04




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 Re: Trnasmission in reply to JRT, 10-04-2001 19:07:02  
Your mechanic is right about not getting all the fluid when they drop the pan and change the filter. Most of the fluid is in the torque converter and other parts of the transmission.

To get all the fluid changed, you need to break the transmission fluid line to the radiator. With the engine running, the transmission pump will cycle all the fluid. Collect what comes out as you pump in fresh fluid with something like a diesel transfer pump. You can buy the pump and all you need for lots less than $125.

I'm getting ready to service my motorhome transmission. After the first one, I'll be saving over $100 for each vehicle.

As for using any solvents in your transmission.... I wouldn't. Fresh fluid should do everything you need.

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Greg D.

10-04-2001 19:36:40




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 Re: Trnasmission in reply to JRT, 10-04-2001 19:07:02  
Is kinda burnt fluid sort of like you better half being a litlle bit pregnant? I think it either is good and not burnt or it smells rotten and burnt!!!! Not much else in between. Without a doubt the "flush" you talk about will clean the system, it won`t however eliminate the reason for the burnt fluid.



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