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Stall converter slipping? ?????'s

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dickeymoore
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Stall converter slipping? ?????'s

Post by dickeymoore » Mon Dec 11, 2017 5:49 pm

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

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TURNA
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Re: Stall converter slipping? ?????'s

Post by TURNA » Tue Dec 12, 2017 4:32 pm

Does the cam match the stall speed and gears?
1980 Malibu BBC T-56 9"
1986 Oldsmobile Cutlass.
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dickeymoore
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Re: Stall converter slipping? ?????'s

Post by dickeymoore » Tue Dec 12, 2017 7:05 pm

Cam will work with stock converter

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malicad
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Re: Stall converter slipping? ?????'s

Post by malicad » Fri Dec 15, 2017 9:05 pm

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.
1978 Malibu Coupe SBC TH350
1979 Malibu Coupe BBC M21 4 speed the "Big Gun"
1979 Malibu Coupe LQ9 TCI 6X
1979 Malibu Wagon 305 TPI 700R4

dickeymoore
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Re: Stall converter slipping? ?????'s

Post by dickeymoore » Fri Dec 15, 2017 9:31 pm

, 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

dickeymoore
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Re: Stall converter slipping? ?????'s

Post by dickeymoore » Fri Dec 15, 2017 9:33 pm

Yeah I'm going with a 1600 stall and rebuild transmission

melloelky
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Re: Stall converter slipping? ?????'s

Post by melloelky » Sat Dec 16, 2017 1:05 am

What cam is in that motor?
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82 el camino
406/200r4

dickeymoore
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Re: Stall converter slipping? ?????'s

Post by dickeymoore » Sat Dec 16, 2017 5:40 am

Comp cams 12-422-8 says it will work with stock converter so I guess 2600 stall will be fine

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malicad
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Re: Stall converter slipping? ?????'s

Post by malicad » Sat Dec 16, 2017 11:40 am

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.
1978 Malibu Coupe SBC TH350
1979 Malibu Coupe BBC M21 4 speed the "Big Gun"
1979 Malibu Coupe LQ9 TCI 6X
1979 Malibu Wagon 305 TPI 700R4

dickeymoore
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Re: Stall converter slipping? ?????'s

Post by dickeymoore » Sat Dec 16, 2017 11:47 am

So don't use the 1600 stall converter with the 241 gears,a stock converter is like 1300 rpm? THANKS

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Re: Stall converter slipping? ?????'s

Post by melloelky » Sat Dec 16, 2017 1:19 pm

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.
rotisserie-mod
82 el camino
406/200r4

dickeymoore
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Re: Stall converter slipping? ?????'s

Post by dickeymoore » Sat Dec 16, 2017 1:21 pm

Yeah I know a gear swap will be better but this my daily driver

dickeymoore
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Re: Stall converter slipping? ?????'s

Post by dickeymoore » Sat Dec 16, 2017 1:23 pm

I'm using a 1600 stall not 2600 stall with 241 gears my bad

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malicad
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Re: Stall converter slipping? ?????'s

Post by malicad » Sun Dec 17, 2017 5:46 pm

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.
1978 Malibu Coupe SBC TH350
1979 Malibu Coupe BBC M21 4 speed the "Big Gun"
1979 Malibu Coupe LQ9 TCI 6X
1979 Malibu Wagon 305 TPI 700R4

dickeymoore
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Re: Stall converter slipping? ?????'s

Post by dickeymoore » Sun Dec 17, 2017 6:00 pm

Yeah I think the trans was already shot I bought it used so I'm getting a brand new one rebuilt from Mad Dog transmission

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