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There's crooks and there's crooks. Some will claim to 'renew every seal, clutch, band, steel, gasket....' when they truly do nothing but take it apart, put in a new (or USED) band, and put it back together. Many others may do more.
Problem is determining who is who. Only thing I can recommend is go look in the back room where the work is done. It the bench is dirty and a big mess, slowly withdraw and check another shop. On the other hand, if the bench is clean, the tools are arranged for handy access, and you can see work in progress you have a much better idea of what the firm thinks of its work. YMMV
g_k50, a band breaks because of two things[that I know of] 1)defective from the get-go or 2)being a little loose whereby the accumulator can really get up a head of steam and whack it hard when it is applied. If you have ever accelerated gingerly, and then really backed off the throttle, and the transmission upshifted hard, you can sometimes *feel* the transmission apply a band very hard. Knowing what goes on, it scares me that it is so easy to get it to happen.
tom
I'm not real familiar with automatic transmissions but it's weird that a head of steam could break a band that's used in the reverse gear. Anyhow, I assume that this band can be tightened, and that there are symptoms of having a loose band.
what you might think of doing as well. check with the BBB if you have a shop you want to take your beast to. they will be able to tell you if that particular shop has had complaints and if so if the complaints were taken care of. just a thought. Bobby
A "head of steam" is my wording for the situation where the servo [accumulator is the wrong term..] has pressure on the 'apply' side, and the pressure is higher than normal, for whatever reason, and the piston has its full travel to build up momentum that can break a band. Simple physics, I think, that there is more energy in a piston traveling in its bore at higher speed, with higher pressure, and traveling further, allowing more speed to build up.
Bands break with a 'bang' sound because they are being stressed, and possibly over time, over stressing can lead to failure. I am not an engineer, but slept in a motel once. Heh. I did learn some stuff from my Dad, who was an turbine engine engineer. He ran a transmission shop for a several years, and when he went back to turbines, I ran it for several months.
tom
Last edited by tomw; Jun 7, 2009 at 09:35 AM.
Reason: info