i have a stock auto 700r4 in my car it has been rebuilt 2x then a shift kit was installed before i bought it the shift kit was broken so i had a gm tech rebuild it again for me but only a couple hundred miles later it sounded like it was grinding and it slipped every once and a while on a rolling stop and go my question is is the trans clutch in the torque converter slipping or is it my rear end? thanks in advance

 

"slipping" can't occur on a rolling stop - slipping occurs when you mash the gas. Not sure what your trying to describe.

 

Srry it's slipping wen I hit the gas after the stop

 

So by slipping (to make sure we're on the same page here), you mean that when you hit the gas, the engine revs but the car accellerates very slowly right?

Grinding doesn't sound good either. Might want to have the last guy that redid it take a look/listen/drive.

 

yea thts correct it isnt horrible yet but its enough to worry me

 

Slipping isn't good on take off but grinding is worse. I would pull the pan and see how it looks. If there is a lot of metal flakes in the pan the clutches could be about gone. I have seen the rear planet bearing come apart. I usually see it on the SS Impalla a lot and on the 4X4 trucks. It seems like every one of these has to much pressure on the bearing in the center of the planet.

Rob

 

sounds like the soft parts were the only thing ever replaced. Also, unless you saw receipts for the prior 2 rebuilds then I'd take that with a grain of salt.

 

thanks rob i think tht might be the issue ill see how it is in a couple more months im low on cash so im not in a huge hurry to send it in the rebuilds were reported in a service book given to me with the car they were done at 60k and 62k miles and the 2nd owner didnt keep records i got 142k now sooo yea the trans has seen better days its not really doing the grinding much now so idk if its because the fluid needed to cycle thu or wut i was told by the tech tht the clutch is the mostlikely thing but he cant be sure ( idk y he didnt check it wen it was apart but thts beside the point) i just thought mayb i could get a second opinion

 

heres some more info: i recently took a look at the pan underneath the car and noticed its missing a bolt not sure if this could cause the issue also when i do a WOT pull on the street it makes a bit of a slip/grind sound kind of from the rear end any ideas?

 

Well a bolt missing isn't a good thing GM put them in there for a reasion. What did the bottom of the pan look like? Was there metalic, black at the bottom like friction material or small pieces of bushing or bearing?

 

a gm tech is does NOT mean he knows anything about transmissions. Bring it to a trans shop, aamco is your best bet, they have guidlines they are required to follow. Independant shops are going to do a patch job warranty it for 6 or 12 months and your gonna be back where you are today in 15 months.

 

Rob, i havnt gotten the pan off (daily driver so i cant spend a ton of time on it) but the next chance i get i will

insomniac, im extremely connected with the buick/cadillac dealership (me and my uncle work there along with multiple family friends so they r my cheapest and best bet right now) so i kno the tech knows his stuff the bottom line is that the trans is old and worn i just need to locate the issue and get the part fixed i just want it reliable till i get some more money for an LSX conversion

 

If it is a daily driver then your best bet is to pickup another $50 to $100 700R4 2wd off of craigslist and have that freshened, beast shell, and small shift kit. All that with a new converter is probably about $370.
You can keep driving now and then install and have it reliable. Save the big pennies for the costly LSX conversion.
Won't the guy that rebuilt it at least tell you if it is the trans or rear end making noise?

 

thts not a bad idea can i build it to hold under 450 torque (just in case ) and the guy cant get it to make the noise idk y i think hes afraid to put the pedal down

 

the concept is great, the dollars that you see posted are fantasyland.

You are now at a crossroad, do you really and honestly believe you can buy a used tranny (disposition unknown) and then not only rebuild it with a basic rebuild kit but also upgrade some parts for a sum total of $370?

If you can't drop the tranny yourself, the lowest price you'll probably find for someone to remove/re-install and rebuild with a basic rebuild and rebuilt t/c will be $1200 plus fluid costs. So, you'll probably be close to $1400 after taxes out the door for a minimal rebuild and labor. If you can drop it yourself, and get a bench rebuild, again you're looking at $700 for a minimum rebuild and then the cost of 12 quarts of fluid, new tranny mount (should replace it) and new u joints (should replace those too)

I understand that you want to believe the low price, but it's not reality.

If you want a tranny to be able to reliably handle over 400 ft lbs torque then it's not going to be under $1,000 and that's without buying a used tranny. Just a moderate torque converter with shipping will run you over $250. So, if you add $250 for a decent TC, $100-$150 for a junk tranny and you're already pushing $400. You don't go through the hassle of rebuilding a tranny without a new or rebuilt TC.

Reliability isn't cheap.

 

yea its not cheap at all the rebuild that i mentioned previously cost me $900 after taxes and labor and i have another tranny at my house but its blown apart inside and the core trade in is $200 so thts not worth rebuilding it but if i end up going with the ls in the future im just gunna get a drop out from a truck with the trans most likely the 4L60E i believe so for now i just want the current trans to run good