No 4th gear

Joaquin P · Jun 25, 2020

So I’ve recently tried my hand at rebuilding a 700r4 with no prior experience, overall the process was somewhat overwhelming but I put it all together and got it back into the truck. I made sure to replace all the clutches and steels, and whatever seals I could along the way. Through each step I rotated the transmission and everything was as free slowly as it could be. I now have it to where it shifts into all three first gears fine, but it doesn’t shift into OD at all. If I’m easy on the throttle it’ll shift through the gears at around 2.3k rpm pretty smoothly, but it won’t go into OD. Is there anything that can be done without having to drop the entire transmission again? If not, will I damage the transmission further by continuing to drive it as is? After this transmission goes out I’m probably going to convert my truck to a manual so I’m not all that worried about toasting it, I’d just like for it to not happen anytime soon if possible.

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Supercharged111 · Jun 26, 2020

So 1-3 but no 4. Well it's not the 3-4 pack or the band itself. When I broke the case on my 4L60 it lost 4th but had 1-3. I think the servo stroke loss was the cause there. Did you measure your servo pin and all that jazz? Any chance it's binding? Verifying this would not require removal of the trans.

Joaquin P · Jun 26, 2020

Supercharged111 said:
So 1-3 but no 4. Well it's not the 3-4 pack or the band itself. When I broke the case on my 4L60 it lost 4th but had 1-3. I think the servo stroke loss was the cause there. Did you measure your servo pin and all that jazz? Any chance it's binding? Verifying this would not require removal of the trans.

No i just replaced the seals and reassembled it back onto the transmission.
What should I be looking for when I measure it?

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Supercharged111 · Jun 26, 2020

I don't recall exactly, just that the length of the pin was very important.

Joaquin P · Jul 7, 2020

So I bought a replacement servo and it still doesn’t go into 4th gear. Would it harm the transmission if I continued to drive it as is? All other gears shift fine

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Joaquin P · Jul 7, 2020

When I replaced the servo some fluid came out and it looked clear. It wasn’t muddy or anything

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Supercharged111 · Jul 7, 2020

No codes? For shift solenoids?

Joaquin P · Jul 7, 2020

Well I have a 700r4 so I’m not sure if it has any of those. The trans light has never came on the entire time I’ve had the truck

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Joaquin P · Jul 7, 2020

I have the non electronic version of the 4l60

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thinger2 · Jul 8, 2020

check the tv (throttle valve) cable adjusment and make sure its not broken or binding.
TV cable adjustment on a 700R4 is super critical.
It controls line pressure and shift points.
Do not drive it until you get the problem sorted.
That is a sure fire way to smoke a 700R4 and the weakest part of the whole system.
I know, back in the day I baked 2 of them before I figured it out

No 4th gear

Joaquin P

OBS Enthusiast

Supercharged111

Truly Awesome

Joaquin P

OBS Enthusiast

Supercharged111

Truly Awesome

Joaquin P

OBS Enthusiast

Joaquin P

OBS Enthusiast

Supercharged111

Truly Awesome

Joaquin P

OBS Enthusiast

Joaquin P

OBS Enthusiast

thinger2

I'm Awesome

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