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6 Speed Transmission Hack Now an official GM procedure


rav3
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Since you didn't watch the vid, it deals with removing exhaust pipe support points rather than connection points. That gives a little more flex in the pipe itself without loosening any pipe connections. I also installed a drain and have replaced 24 quarts of fluid over the last 10K miles. Call it a poor man's flush.

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I have an update for my truck regarding the pill flip. I flipped the pill last May at 30,041 miles. I also changed six quarts of fluid and the filter. Fast forward to now, I have over 41,000 miles and the hottest the transmission fluid has gotten is 165. That’s in stop and go traffic on a hot and humid day with the ac on. Most of the time, it only gets into the 130s or 140s. The fluid is still red and in good shape. It was definitely worth doing it.

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To get back to those had asked me questions and just fill in blanks...

I used one Harbor Freight ratchet strap ~$8 and just looped it around the pipe behind the Y and the crossmember.  I cranked it down to almost touching the crossmember, and didn't loosen or remove any supports or the manifold connections, nor did I loosen the transmission mount and raise the transmission.   I was pleasantly surprised when the pan just twisted a bit and came out. 

 

As for fluid in the pan upon removal, I had unhooked the upper line on the thermal valve block, shoved a piece of 3/8" O.D. hard poly line into the thermal valve block (round/taper the edges of the hard poly line to allow it to push in without damaging the seal in the block), and slipped a 1/2" I.D. clear hose over the line that I removed from the thermal valve block, and ran those two lines into a 2 gallon graduated pail (so I could measure fluid removed) I bought at HomeD or Lowes.  Here's the step that was a mess...I started the engine and let it idle until all the fluid pumped out.  Best to have two people for this.  The line jumped out of the pail and sprayed around a cup of fluid all over.  Fortunately, I had layed out about a 10 x 10 ft sheet of heavy plastic.  Once the fluid was pumped out, the pan only had a little fluid left in it when I was manuevering it out. 

 

I installed the new filter and pan with the drain plug (~$6 ea for GM engine 12mm x 1.75 drain plugs with a seal built-in.  I bought 3 from my local Chevy dealer to have a couple spares).  Then I filled with the amount of fluid I had collected from draining.  I started the engine with the same hose arrangement on the upper line of the thermal valve block as the earlier step, and purged out the remaining amount of fluid that was dark and saw clean fluid (~3-4 qts), equal the total system volume of about 13 qts.  During this process, I had to overfill it as I was doing this all by myself.  If you have a helper, you can have them add fluid as you purge.  I'm confident I have all new fluid in there now, with little to no old fluid in the converter, lines and cooling system. 

 

Edited by Spurshot
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On 6/21/2022 at 9:05 AM, Spendit said:

Spurshot - Curious if the pan drop was as bad as some report - wedging up engine, small hands to twist it out between cross member and all the wood chunks and straps to have on hand? I have the 5.3 CC with 100K now

 

Not nearly as bad as I imagined.  I ran my truck up on 5" race ramps placed between the front and rear tires and backed up the ramps, chocked it, set the brake.  You could use a jack and some blocks or jackstands instead.  My driveway is slanted and I don't like to use jacks or stands when working under a vehicle, so I use ramps or blocks when possible. This allowed more room to work under it, got the ramps out in front of the front tires and allowed side access, as well leveled my truck in my slanted driveway.   Placing a large sheet of heavy plastic down saved a lot of cleanup of the driveway. It was worth whatever that plastic sheet cost.   I used a ratchet strap as mentioned above and didn't loosen or jack anything.  But I think the thing that helped me was pulling the line and purging all the fluid out before dropping the pan.  The pan only had about a quart or less in it when I did drop it.  So it was easy to maneuver around and get it out.  I was prepared to loosen the trans mount and jack it, but it just wasn't necessary.  The cheap chinese ratchet strap sorta folded the sideplates when I tightened it, so I simply cut it loose after the pan went back on.  

 

Oh...get one of those cement mixing tubs to catch the oil spillage. 

Medium Mixing Tub A-41 (homedepot.com)

 

And one of these graduated buckets to measure what you drain...or any other way to measure what you drain and see the color of what's coming out.   United Solutions 10-Quart Plastic Paint Bucket in the Buckets department at Lowes.com

 

The hoses you'll need are a couple feet of clear vinyl 1/2" I.D. and 3/8 O.D. (1/4" I.D.) poly (milky white) hard plastic hose (think ice maker line).

Edited by Spurshot
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2 hours ago, pokismoki said:

you guys are working too hard, just undo the rear trans mount bolt and lift the trans up off the pad, this gives you the clearance to pull the pan

How high did you lift the transmission?

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2 hours ago, steelerdude15 said:

How high did you lift the transmission?

 

One video I saw mentioned not wanting to lift it more than an inch, due to some wires he was worried about(?)  He also strapped the exhaust to the crossmember before jacking the trans. 

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only high enough to slide the pan out after you drained and took all but the last two bolts out, which are left in to dangle the pan for drainage. you can actually lift the trans off the pad as high as needed and reach in and pop out the filter, install new one , no need to take the pan off completely if i remember correctly. i did it this way about 2 years ago.  

 

buy about 4 cans of engine starter (ether), and hose down the transmission with this stuff, it works amaizingly well for degreasing while not damaging plastics or alloys. 

Edited by pokismoki
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In my case, at 94,--- miles, I wanted to change the pan itself as well as inspect what was in the bottom of the pan to determine if my converter was shedding debris and killing my trans.  So, leaving it hanging wasn't in the plan.  

 

It simply took one ratchet strap pulling down the exhaust to the crossmember, without unhooking anything on the exhaust. I thought it was about the simplist way to deal with the exhaust.  No muss, no fuss.

 

GMC trans.jpg

Edited by Spurshot
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13 hours ago, pokismoki said:

only high enough to slide the pan out after you drained and took all but the last two bolts out, which are left in to dangle the pan for drainage. you can actually lift the trans off the pad as high as needed and reach in and pop out the filter, install new one , no need to take the pan off completely if i remember correctly. i did it this way about 2 years ago.  

 

buy about 4 cans of engine starter (ether), and hose down the transmission with this stuff, it works amaizingly well for degreasing while not damaging plastics or alloys. 

Yeah, the last time I changed the fluid, I didn't take the pan off completely. Even with the pan in the way, its easy to get the filter out and clean everything.

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