Stall converter slipping? ?????'s

dickeymoore

Dragway Regular
Mar 19, 2007
814
0
0
Atlanta,Ga.
I have a 1980 Chevy Monte Carlo with a 700 R4 transmission and or TCI Saturday Night Special torque converter 2,000 RPM stall with stock 241 gears in the rearend or 2 Series gears the car drived and shift fine driving in normal operation but if you stomp on it from a standstill it will pull and second to third shift would be like a delay and hesitate and the transmission will act like it's slipping if you're going uphill with some pressure on it and you can feel it in the rear tire chirping and slip, is this the stall converter or the transmission, the transmission shifts fine on the normal operation thanks
 

malicad

Dragway Regular
Dec 8, 2009
1,383
0
0
South Milwaukee, WI
Of course the transmission is slipping. You are running a 2000 rpm stall converter with stock 2.41:1 gears? Why would you do that? There is not enough mechanical advantage in the rear axle to take advantage of the higher stall. You are creating excess heat in the trans, and it won't last too long. Change the rear gears to 3:42 or higher, or put a stock stall converter back in the transmission.
 

dickeymoore

Dragway Regular
Mar 19, 2007
814
0
0
Atlanta,Ga.
, yeah I figured the transmission is just shot after I pulled up the pan and there is a lot of black and gray stuff in it so I'm just going to get a rebuilt transmission
 

malicad

Dragway Regular
Dec 8, 2009
1,383
0
0
South Milwaukee, WI
Don't use that converter! You are going to burn up another transmission. That black and grey stuff you saw was your clutch material. Think of it in terms of comparing your automatic to a manual transmission. You have a numerically low gear (2.41) and a high stall converter, designed to give you greater mechanical advantage off the line. But...your car isn't setup for quick acceleration with the mild gear. Think of having a manual trans car in 3rd gear at a stoplight. This would be similar to your current setup. You need to rev the engine up, and slip the clutch just to get the car moving. (like having a high stall converter) You can do it, but you will ruin the clutch. Matching the cam to the converter has NOTHING to do with your combination UNLESS you FIRST match the rear gears to the converter. Put in deeper gears (numerically higher) and you will be fine! (Well, after a trans rebuild)....A good SBC with a TH700R4 with a 2600 stall and 3.42 or 3.73 gears is a ROCKET off the line.
 

melloelky

Top Fueler
Jul 1, 2009
3,590
1
38
mass
these guys are rite,keep your existing converter,set up some gears in your car it'll be much more fun than the way it is now.
 

malicad

Dragway Regular
Dec 8, 2009
1,383
0
0
South Milwaukee, WI
Depending what the 700R4 trans came out of, the stock converter's stall will vary. Believe it or not, most stock, replacement, non-performance converters can stall anywhere from 900-1300 rpm. If I were you, I would replace the gears with maybe 3.23 or 3.42 gears. My wagon's got the same transmission as yours, and I literally JUST did the exact same gear swap. I went from 2.41 to 3.42 gears, and this is my "cruiser" Malibu (I have 4, lol). The performance difference is shocking, and with the overdrive, cruising is still a breeze. I think my rpms went up by 800 or so when in overdrive at similar speeds, which is no big deal. I have a stock stall converter (although my trans is from a 86 or 87 Camaro) and the combo is awesome! I'm VERY VERY happy I did the swap.

**I just read that you have a 1600 rpm stall instead of the stated 2600 one. That bothers me...hmmm...The lower stall combined with the mild gears "shouldn't" have caused any real problems. Maybe the clutches in the trans were on the way out anyway.
 
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