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Old 12-06-2012 Thread Starter
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7th and 8th gen transmission service procedure

So you want to service your own transmission eh? Well it's not a tough job, and it will save you a fortune over having someone else do it. First a couple notes, one is that the manufacturer recommends doing this service every 50k miles, but with the issues these have, 30k is a much safer bet. Two, use only dexron VI rated fluid, it's mostly synthetic, and will hold up much better than the older fluids, plus it is required by GM, and you could void your warranty without it. Three, additives are the devil, do not use any if you don't want to rebuild or replace the transmission any time soon. And fourth, getting an external cooler installed will also greatly prolong the life of your transmission.

With the formalities out of the way, lets start with what you will need. A jack, 2 jack stands, a creeper, a funnel, rags, a 10mm socket and ratchet, either deep socket or with an extension, a hammer, a large drain pan, and a flat blade screwdriver.
So first, raise and support the front of the car with the jack stands, support at the pinch welds so you have room to work.
Next, slide the drain pan under the tranny pan and loosen the bolts. Fluid will start pouring out as soon as you loosen the bolts, so you may want to give it a few minutes to let it slow down. Remove the pan and gasket, DO NOT THROW THE GASKET AWAY! Throw away the one that came with the filter and reuse the old one, they will last forever.
Remove the filter from the trans by gently prying with your screwdriver.
Then remove the seal, carefully pry up the edges with the screwdriver and pull it out, do as much damage to the seal as you wish, just don't hurt the tranny case.
Install the new seal, and tap the new filter into place.

Clean the pan, magnet, and gasket.
Reinstall pan and gasket, tighten the bolts by skipping every other bolt all the way around, then make a second pass getting the rest. Tighten to 100 in/lbs, or good and snug if you don't have a torque wrench. Do not overtighten, as these bolts will break easily.

Lower the vehicle back down level, and using the funnel, add 7 quarts of dexron VI. Start the vehicle, place your foot on the brake, and slowly shift through all of the gears a couple of times. Leaving the vehicle running in park, check the fluid level, and add as necessary.

Congratulations! You are done.

1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 12-06-2012
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A Big thankyou kingnutin for the write up on transmission service. Well done.

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Old 12-06-2012 Thread Starter
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You are very welcome! I am trying to get some of these write-ups done for common procedures so I don't have to keep repeating it.

1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 12-06-2012
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Great job thanks king


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Old 12-06-2012
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Old 12-06-2012
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Old 12-07-2012
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Thanks! Will do at 30k (currently at 18k). Will look into getting external oil cooler. Nowadays one can pick up one for around $200, and maybe another $200 for braided hoses, AN fittings, and custom bracket.

and rx8 the transmissions are known for getting really really hot. rotary engines are known to get a lot hotter during running times than a piston engine, and that is why rotary Vehicles have tranny coolers because if they don't the tranny will heat up the motor even more which will most likely will lead to short engine life or a catastrophic failure, even the motor has dual oil coolers.
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I thought I would add that last part to show an example of how manufacturers nowadays are also trying to prevent engine failure, I mean the rotary doesn't have a very nice past.... they have come a long way.

As far as a transmission cooler goes, if you can afford it do it. just beware of warranty issues.... I haven't dealt with the Chevrolet dealership yet but with the my Mazda putting in intake and they gave me a lot of shit... they don't like anything after market.
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+sender unit & temp gauge or is that a little too much? Lol
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Temp gauge can't hurt anything, but usually they only come in handy for towing or racing. At any rate, the same basic principles will apply to most automatic transmissions, some filters attach differently, and some have an o-ring seal on them. Other than that, and of course fluid specification and capacity, you can service just about any automatic tranny with this walk through.

1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 12-07-2012
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Great info! My mechanic told me that either you do the tranny constantly or dont do it at all. I have never had the tranny fluid changed. He said if you do it now it may affect the way the tranny operates. My mileage is 115,000 ... After seeing this I will do my tranny fluid change. Do you think this will have an adverse affect?
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It is often the case that if you go that long without a service, it could do more harm than good. I would leave it alone, but it's your call.

1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

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Old 12-11-2012
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So I've had my car for a little over 3000 miles now. I bought it with 16k and it's now about to reach 19 K. Well I got a little surprise from the car on the garage floor last night while backing out before leaving to work. It was a small puddle about a foot in diameter, it was transmission fluid. I have yet to creep there and check the car out, but I did check the tranny oil level. the level was low and was just above at the mark to add 1 pt. I always check the fluid in my car if I'm driving anywhere beyond an hour, I've had too many bad experiences in the past (rotary). This had to have happened recently within the weekend ...I hope its something simple like just the oil pan gasket... 18k mi and already starting with problems.... anyways I remembered this thread and realized that I might as well do this. It was relieving to find at least some fluid in the tranny...


Last edited by ZumnRX8; 12-11-2012 at 08:45 PM.
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Old 12-11-2012
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