anyone used RTV only on a tranny pan? did it work?

 

According to GM, there are some pans you can use RTV with and some you shouldn't. The difference is in the ridges along the sealing surface. I don't rememberwhich is which.

 

I've always heard that you can't use it on any automatic. Somthing about the trans fluid dissolving it and running it through the system.

 

If you use rtv and accidently block the small servo dump passage, you will quickly burn up the trans.

 

makes sense. RTV can get anywhere inside. thanks.

 

chryslers come from the factory and use nothing but rtv. I have yet to see a gm come from the factory with rtv.

 

GM will not use it on the pan rail because of the servo dump hole. It is only 1/8 of an inch away from the gasket. The last trans I did was killed by rtv in this hole. It only had 4k miles on it. Owner took it back to the trans builder for a service and he reused the gasket and rtv'd it. He is closed up now(bankrupt) no recourse except to rebuild it. $2 tube of blue silicone cost him $1100.

 

The factory service manual allows the use of RTV. I'd rather use a gasket though.

 

Thats the 2nd time Ive seen RTV in a service manual as a replacment for a gasket. Over at the Truck board some people were saying thier trucks came with RTV on the valve covers from the factory and showed a service manual scan to back it up.

Either way use a gasket. Tt's much safer then RTV, besides the mounting surface must be super clean and dry for RTV to cure properly.

 

that's my biggest bitch about chrysler products they tend to use a lot of o-ring gaskets and rtv.