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I have a 96 GS 6 speed. I changed the fluid in the diff. I only got 40 oz out of it (I do have 4:10's in there, that wouldn't make a difference would it?). I used the big hose on the pump and I used the little hose on the pump. I stuck those stupid hoses everywhere, back, forward, sides and all I could get out was the 40 or so ozs. I knew I was susposed to get more out so I kept trying for an hour or so.
I finally gave up, put the two bottles of additive in and filled the rest with 80-90 wt. GM fill. The bottles were 23 oz (the ones from GM and I couldn't quite get the second bottle all the way in). I put in about what I got out before fluid came out of the hole.
Can anyone guess or tell me why I couldn't get more out? The car was level (as close as I could tell anyway), up on jack stands.
Am I OK with what I did or do I need to start over?
Whoops, maybe I'm off on this. From what you're saying, the 40 oz + the two additives sounds about right. I was thinking more because the parts person at GM told me I had to have three bottles of the GM fluid (around 23 oz each).
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
I don't know exactly how much it's supposed to hold, but mine held 44, and that's an easy number to remember.
a few oz either way won't have any effect.
This topic came up awhile back so I checked my factory service manual, user manual, haynes manual, none of them mentioned the capacity. GM might not even consider it a service item for all I know.
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Also, the recommended amount of additive is 8 oz. I put in 4 because it was all I had. Obviously put that in before you start pouring the second bottle of oil.
Jcrow,
I just got a cheap one at Wallmart. I noticed my latest Harbor Frieght has some for $5.00. I might stock up a bit as I worry about how clean the pump is after sucking that stuff out of there.