72 c10 trans shifting - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skidoo · 02-27-2023, 11:52 PM

Anyone on here running a 383 stroker TCI street fighter trans with 2600 stall? My 1st to 2nd shifts so hard it chirps the rear tires. Do you think my TV cable is to tight or is that the nature of the beast.

**MikeB** · 02-27-2023, 11:58 PM

700r4?

**Steeveedee** · 02-28-2023, 01:24 AM

Quote:

Originally Posted by skidoo

Anyone on here running a 383 stroker TCI street fighter trans with 2600 stall? My 1st to 2nd shifts so hard it chirps the rear tires. Do you think my TV cable is to tight or is that the nature of the beast.

Too tight a cable leads to late hard shifts. Is that what you are experiencing? Proper adjustment of the cable is critical, especially on the 200 and 700 transmissions. Too loose, your trans would be toast soon. Which trans do you have? I always liked the chirped tires on the 1-2 shift, back in the day. A 2-3 chirp was a bonus.

**Accelo** · 02-28-2023, 01:26 AM

Not likely the TV cable adjustment will help.
Very likely they installed either the Corvette Servo or a Billet Servo and/or bypassed the accumulator. Easy enough to change out the Servo, as it doesn't require pulling the pan.
If you have the Corvette Servo go to the stock one and if it's a Billet go to the Corvette Servo. Pictures of each style are available on the internet.

What many people don't understand is shift quality is very much affected by the differential gear ratio, the weight of the car and the stall of the torque converter. This is all taken into account by the OEM's. Once you change things their is not much control over shift quality/firmness.

If you are not comfortable with this work most local shops will change this out for you. It's a 30 min job, maybe less? Consider if you mess with it any warranty you had will typically be null.
Cheers

**MikeB** · 02-28-2023, 10:10 AM

I know the OP said "TV cable", but I've heard detent cables referred to as TV cables, and vice versa.

If it's a TH350, I've seen a cheap B&M Shift Improver kit cause harsh 1-2 shifts even at light throttle. I removed that sucker and have used nothing but TransGo kits since.

Probably 90% of us want firm shifts, but not harsh, u-joint killing shifts.

Neither B&M nor TCI would be on my transmissions parts shopping list.

skidoo · 02-28-2023, 10:33 AM

The Trans is 700r4

**dagnabbitt** · 02-28-2023, 12:08 PM

It's a feature, not a bug.

But I'd go to a transmission shop and get the cable checked anyway, always a good idea.

**Accelo** · 02-28-2023, 05:23 PM

Quote:

Originally Posted by MikeB

I know the OP said "TV cable", but I've heard detent cables referred to as TV cables, and vice versa.

A detent cable only affects down-shaft timing. Nothing else. The transmissions with a detent cable can be operated without them even hooked up.
They work just a THM 400ls. However, 400's detent is electrically operated. It too can be left disconnected. All of the GM transmissions with a detent cable have governors and Vacuum modulators that control the shift points.

A Throttle Valve (TV) is different. The have an effect on shift timing and shift firmness. Inside the transmission they move the TV valve. This isn't the on/off style a detent cable uses. The TV valve replaces the Vacuum modulator in the transmissions they are used on. A TV cable can't be left disconnected as you will have a 100% chance of burning up the transmission.

Yes, on the street they are sometimes used interchangeably. IMHO their is enough functional difference one should call it what they are to avoid transmission issues.
Cheers.

02-27-2023, 11:52 PM	#1
skidoo Registered User Join Date: Mar 2015 Location: alberta Posts: 23	72 c10 trans shifting Anyone on here running a 383 stroker TCI street fighter trans with 2600 stall? My 1st to 2nd shifts so hard it chirps the rear tires. Do you think my TV cable is to tight or is that the nature of the beast.

02-27-2023, 11:58 PM	#2
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,663	Re: 72 c10 trans shifting 700r4? __________________ Mike 1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- converted from 250-six to roller cam 350, Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

02-28-2023, 01:26 AM	#4
Accelo Senior Member Join Date: Mar 2015 Location: washington Posts: 2,356	Re: 72 c10 trans shifting Not likely the TV cable adjustment will help. Very likely they installed either the Corvette Servo or a Billet Servo and/or bypassed the accumulator. Easy enough to change out the Servo, as it doesn't require pulling the pan. If you have the Corvette Servo go to the stock one and if it's a Billet go to the Corvette Servo. Pictures of each style are available on the internet. What many people don't understand is shift quality is very much affected by the differential gear ratio, the weight of the car and the stall of the torque converter. This is all taken into account by the OEM's. Once you change things their is not much control over shift quality/firmness. If you are not comfortable with this work most local shops will change this out for you. It's a 30 min job, maybe less? Consider if you mess with it any warranty you had will typically be null. Cheers

02-28-2023, 10:10 AM	#5
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,663	Re: 72 c10 trans shifting I know the OP said "TV cable", but I've heard detent cables referred to as TV cables, and vice versa. If it's a TH350, I've seen a cheap B&M Shift Improver kit cause harsh 1-2 shifts even at light throttle. I removed that sucker and have used nothing but TransGo kits since. Probably 90% of us want firm shifts, but not harsh, u-joint killing shifts. Neither B&M nor TCI would be on my transmissions parts shopping list. __________________ Mike 1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- converted from 250-six to roller cam 350, Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

02-28-2023, 10:33 AM	#6
skidoo Registered User Join Date: Mar 2015 Location: alberta Posts: 23	Re: 72 c10 trans shifting The Trans is 700r4

02-28-2023, 12:08 PM	#7
dagnabbitt Senior Member Join Date: Dec 2014 Location: Edmonton Alberta Posts: 1,509	Re: 72 c10 trans shifting It's a feature, not a bug. But I'd go to a transmission shop and get the cable checked anyway, always a good idea. __________________ DAVE Edmonton, Alberta 1959 Apache 1967 K20 1968 C20 1970 C10 1972 GMC 2500 1981 C10



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