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soda blasting a trans #1168533 01/30/12 02:03 PM 01/30/12 02:03 PM
Joined: Oct 2006 Posts: 7,367 Iowa burdar OP Owen's Dad
burdar OP Owen's Dad Joined: Oct 2006 Posts: 7,367 Iowa	I had the original 904 trans rebuilt awhile ago. The case was stained and I told the shop I wanted to get it as clean as possible. Well, they ended up wire wheeling the case. I got it home and spraying it with Eastwood Alumablast.(yes, it was a mistake) I'm going to strip the paint off of the case but it will still be somewhat polished under there. I thought about having it soda blasted to bring back the "as cast" appearance. I don't want to risk using something that could get inside and do damage. What will baking soda do to a trans if a little gets inside? Any opinions on this? Thanks

Re: soda blasting a trans [Re: burdar] #1168534 01/30/12 02:11 PM 01/30/12 02:11 PM
Joined: Jan 2012 Posts: 489 NE B bigtail mopar
bigtail mopar B Joined: Jan 2012 Posts: 489 NE	Don't know if this will help you, but on Cope racing Transmission site, they say they glass bead all cases inside and out. I don't know what kind of finish it will give you. Might have to experiment a bit. I don't know how you would seal it. Blasting stuff seems to get everywhere. This page is made up completely of recycled electrons.

Re: soda blasting a trans [Re: burdar] #1168535 01/30/12 02:12 PM 01/30/12 02:12 PM
Joined: Jan 2003 Posts: 75,004 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,004 U.S.S.A.	You are going to have to disassemble the trans if you are going to do that. A- friend did something similar , actually a friend of his did it , and the media was INSIDE the trans . I would just mask off the ends and maybe hose it with EaGLE ONE mag wheel cleaner , the kind that etches , first and see how that takes care of the shine .

Re: soda blasting a trans [Re: JohnRR] #1168536 01/30/12 02:28 PM 01/30/12 02:28 PM
Joined: Oct 2006 Posts: 7,367 Iowa burdar OP Owen's Dad
burdar OP Owen's Dad Joined: Oct 2006 Posts: 7,367 Iowa	That's a good idea. It's been quite awhile since I painted the case so I'm going off of memory. I'll strip the paint and see what I have to work with. I figured some media would get inside so I didn't want to use glass beads...I just didn't know what soda would do. If I can get away with some kind of etching wash I'll try it. Thanks

Re: soda blasting a trans [Re: burdar] #1168537 01/30/12 02:30 PM 01/30/12 02:30 PM
Joined: Dec 2007 Posts: 18,157 Mass DAYCLONA I Live Here
DAYCLONA I Live Here Joined: Dec 2007 Posts: 18,157 Mass	Soda blasting will inpart a shine to the case as the soda is so fine, glass bead really opens the surface, and will inpart a dull finish, that will soon oxidize, find someone that can blast with walnut shells or cherry pits (really) it will inpart a more natural finish, you can easily block the side tubes with npt plugs, and tailshaft slip in plugs are cheap, from Summit, Jegs, etc, keep or throw a converter in it to prevent anything getting past the seal,make a strap/bolted across the converter to hold it in, and either remove and plug the tube hole, or duct tape the handle in the tube, plug the vent with a npt plug,...then you should be good to go, have them stand it on the bell only when blasting

Re: soda blasting a trans [Re: burdar] #1168538 01/30/12 02:46 PM 01/30/12 02:46 PM
Joined: Jun 2003 Posts: 21,427 It's a dry heat gtx6970 Too Many Posts
gtx6970 Too Many Posts Joined: Jun 2003 Posts: 21,427 It's a dry heat	My if your going to blast it 'with anything'. dis-assemble it to a bare case before doing so.

Re: soda blasting a trans [Re: burdar] #1168539 01/30/12 06:35 PM 01/30/12 06:35 PM
Joined: Jan 2003 Posts: 25,785 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,785 Rio Linda, CA	Dry ice is the only blasting media I would use on an assembled transmission.....protect the seals. The INTERNET, the MISinformation superhighway

Re: soda blasting a trans [Re: burdar] #1168540 01/30/12 07:09 PM 01/30/12 07:09 PM
Joined: Dec 2011 Posts: 115 Canada S Seventythree member
Seventythree member S Joined: Dec 2011 Posts: 115 Canada	Regardless of the blast media used, any blast media (including dry ice) will dislodge the paint and risk contaminating the orfices on the trans. I have seen dry ice blasting being done, and it makes a heck of a wet mess of the surrounding area, think wet paint.

Re: soda blasting a trans [Re: gtx6970] #1168541 01/30/12 07:43 PM 01/30/12 07:43 PM
Joined: Nov 2009 Posts: 2,177 ill D dennismopar73 top fuel
dennismopar73 top fuel D Joined: Nov 2009 Posts: 2,177 ill	Quote: My if your going to blast it 'with anything'. dis-assemble it to a bare case before doing so. No way would I blast a trans assembled! to me wouldn't do one any ways, get out some alum tank shine?cleaner be happy, find nice color you like paint the outside inside would be a cleaner and a wash be happy!

Re: soda blasting a trans [Re: Seventythree] #1168542 01/30/12 07:57 PM 01/30/12 07:57 PM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	Quote: Regardless of the blast media used, any blast media (including dry ice) will dislodge the paint and risk contaminating the orfices on the trans. I have seen dry ice blasting being done, and it makes a heck of a wet mess of the surrounding area, think wet paint. huh? dry ice is, uh, dry. it's CO2. no water. if you use dry ice, then the moisture came from somewhere else. GE uses dry ice blasters to clean their equipment at the light bulb plant in Bucyrus. but there is no moisture anywhere. they're cleaning oil and grease, light bulb coating dust, etc. off the equipment. nothing gets wet. but, yea, even using dry ice to blast a trans...not only is it going to be expensive (where you gonna buy dry ice to blast with, or the eqipment to keep the dry ice from melting before you can use it?) but it will also leave paint chips that could get into the trans. if it was mine, and I was trying to get an "as cast" appearance, I'd try oven cleaner sprayed lightly, scrubbed with a brush and rinsed away quickly. do not let it sit, as it WILL eat into the aluminum. but I gotta ask, why do you want a bare, 'as cast' look? it's going to tarnish and oxidize rather quickly. is there a paint you can use to just re-paint the trans? Photobucket sucks

Re: soda blasting a trans [Re: 70Cuda383] #1168543 01/30/12 09:23 PM 01/30/12 09:23 PM
Joined: Oct 2006 Posts: 7,367 Iowa burdar OP Owen's Dad
burdar OP Owen's Dad Joined: Oct 2006 Posts: 7,367 Iowa	Quote: but I gotta ask, why do you want a bare, 'as cast' look? it's going to tarnish and oxidize rather quickly. is there a paint you can use to just re-paint the trans? Paint on an automatic trans looks horrible.IMO I'll be RPMing the trans once it's stripped so it will stay looking new. Quote: if it was mine, and I was trying to get an "as cast" appearance, I'd try oven cleaner sprayed lightly, scrubbed with a brush and rinsed away quickly. do not let it sit, as it WILL eat into the aluminum. I accually thought about using oven cleaner. I have a 727 tail shaft that I can do a test on. Thanks Last edited by burdar; 01/30/12 09:34 PM.

Re: soda blasting a trans [Re: burdar] #1168544 01/31/12 12:17 PM 01/31/12 12:17 PM
Joined: Jan 2003 Posts: 5,948 British Columbia C chrisf master
chrisf master C Joined: Jan 2003 Posts: 5,948 British Columbia	as a guy who does soda blasting for a business i can tell you that you probably wont get the results your hoping for. it will remove the paint and leave it clean but its not abrasive enough to leave a uniform colored finish, so places that were stained with cooked on oil will still be dark. any pressurized blasting including dry ice will damage your seals, dry ice is 3x the price and you will get the same results as soda. i do alot of motorcycle engines with soda and tell the customer before hand how its going to look and most are happy. that being said i wouldnt be afraid to blast a working tranny with soda. with a smaller tip you can avoid any seals that may be damaged

Re: soda blasting a trans [Re: chrisf] #1168545 01/31/12 12:36 PM 01/31/12 12:36 PM
Joined: Oct 2006 Posts: 7,367 Iowa burdar OP Owen's Dad
burdar OP Owen's Dad Joined: Oct 2006 Posts: 7,367 Iowa	Once the trans was wire wheeled I think the staining was gone...it just looked "wire wheeled". This entire car has been a PITA. EVERYTHING I did previously(because I thought it was the right thing to do at the time) is being redone. I made so much more work for myself it's unbelievable. The trans probably won't look new again without taking it all apart to refinish the case. That's not an option right now. I need to get this thing on the road before I run out of money...and hair. Thanks everyone for the tips. I'm going to start working on it very soon.

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