my cousin has a 700r4 and its always had a late but firm 4th shift . no real slipping felt .
anyone got ideas ? thanks .
@Greg Ducato @6872xtc
anyone got ideas ? thanks .
@Greg Ducato @6872xtc
CK5
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700r4 late shift 4th gear ?
- Thread starter sweetk30
- Start date
I don't know a great amount on this, but mine don't hit 4th as quickly as the other gears unless I lift off of the pedal slightly. It isn't a great delay in shift timing, I must know that it's later. I just figure that it's designed to do it so that it doesn't shift too early and end up having to drop back down.
The TV cable, governor springs and line pressure affect all gears, so I would guess that there is a spring on the 4th valve in the valve body that makes a difference.
Again, I don't know for sure.
The TV cable, governor springs and line pressure affect all gears, so I would guess that there is a spring on the 4th valve in the valve body that makes a difference.
Again, I don't know for sure.
Shouldn't have to lift to get it to shift thats a oil pressure thing. If we are talking about a OEM equipped car/truck, it should shift right about 42 mph, under a light to normal acceleration. Heavy accel 45-50mph.
Mine will shift as early as 36, but nothing on mine is original.
Mine will shift as early as 36, but nothing on mine is original.
My stock K5 with 3.42:1 gears shifted into OD at 55 on flat ground under normal acceleration. 60 on a slight up hill. If I stood on the throttle from a dead stop, 2nd was just above 40, 3rd was at 65. Never stayed in it to see where OD hit. My balls are not that big.
wow 55 sounds late to me, I was working at a gm agency when these transmissions where new 2004r and 700r4 I remember complaints about double bumps 4th then lock up at 42-43 mph. That was in 87 on sedans the square trucks still had 3 speeds.
Both of my 87s have/had 700r4's.
Let me explain better. I don't have to lift to get any of my three 700R4's to hit OD. It if I lift slightly during normal acceleration, they will shift sooner than if I maintain the same pedal position. This is generally at lower speeds. Gear ratio, governor springs and TV cable settings will change the speed at which each vehicle will shift. I have 2 retro-fitted trucks with shift kits in both. They will both take OD at very low speeds, if I want. And they will hold it with decent throttle input after converter lock-up.
So maybe light throttle is when Sweet's cousin notices the late shift more?
I have read that there is a valve in these to deny OD after 50% throttle input, but an aftermarket one lets it go up to about 75% throttle. Possibly this plays into a delayed upshift at all speeds for some applications. I don't know.
Useless fact,
My '72 C10 with 3:73 gears and 27" tall tires, will hold overdrive past 100 mph, but I don't know how far past, I never had risked the ticket to find out.
So maybe light throttle is when Sweet's cousin notices the late shift more?
I have read that there is a valve in these to deny OD after 50% throttle input, but an aftermarket one lets it go up to about 75% throttle. Possibly this plays into a delayed upshift at all speeds for some applications. I don't know.
Useless fact,
My '72 C10 with 3:73 gears and 27" tall tires, will hold overdrive past 100 mph, but I don't know how far past, I never had risked the ticket to find out.
My 85 has a 700R4 factory.
yup I was recalling an 85 I recently worked on for a buddy with 700r4.
Define "late". The RPM is higher than the other shifts? Do you know the setup of the truck? If it's not stock, that opens up a lot of other possibilities, especially if someone has rebuilt the transmission. Should be easy to hold the pedal constant to rule out an issue with TV geometry, but not very precise without a tach.
If the shaft of the governor is loose on the governor body that can produce a late 3-4 shift. Of course a sticking 3-4 shift valve can do the same thing or even a leaking 4th gear pressure switch. Normally if the switch is leaking it will allow the shift then drop back to third quickly as 4th gear oil is exhausted. Check your governor shaft first, if you have a spare swap it out.
thanks for all the info guys . i will forward this on to my cousin and see if it helps him . 
