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700R-4 version 3.0

Preliminary results are good, as proven by Swamper tracks. Was delayed due to another foot of snow today, but that's just how Spring is.

Short term plan is to re-install torque rods, front driveshaft, etc. and store in barn until *real* spring comes (we just passed fake spring #3, with a couple more feet predicted this weekend.), then test transmission for real. It's amazing how many gallons of ATF are required for full tranny rebuild and full T-case rebuild.

20260313_194013.jpg
 
Blue85 said:
Preliminary results are good, as proven by Swamper tracks. Was delayed due to another foot of snow today, but that's just how Spring is.

Short term plan is to re-install torque rods, front driveshaft, etc. and store in barn until *real* spring comes (we just passed fake spring #3, with a couple more feet predicted this weekend.), then test transmission for real. It's amazing how many gallons of ATF are required for full tranny rebuild and full T-case rebuild.

View attachment 523636
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Good to have positive results!
:saweet:
 
K5 is put away in the back of the barn, awaiting better weather. The only things missing are the skid plate and the torque rods. It's been really weird having all of the fluids filled and no spots of oil on the floor. I've been keeping cardboard under it for years, maybe decades.
 
I've driven this a few times, aiming to get the fluid level right. These new pale oils don't help. It drives good most of the time and uses 4 gears, but sometimes shifts weird. The TV cable is not auto-adjusting as described, but I'm able to tell at some level when it's actually doing something and when it's bottoming out.

Needs more attention, but so fun to drive vs. lay under.
 
Blue85 said:
I've driven this a few times, aiming to get the fluid level right. These new pale oils don't help. It drives good most of the time and uses 4 gears, but sometimes shifts weird. The TV cable is not auto-adjusting as described, but I'm able to tell at some level when it's actually doing something and when it's bottoming out.

Needs more attention, but so fun to drive vs. lay under.
Click to expand...
That's great.
Hopefully soon I will be getting to my 700r4 rebuild.
In the meantime I am trying to get my 98 going, started with an exhaust leak and found burnt wiring and I am trying to get it fixed.
 
On the way to work and back today in it, I realized that the issue was the proportion and consistency of where it thought my throttle was at. Sure, there could be differences between Quadrajet and TPI, but both are shown in the B&M manual and when I measure distances and angles, it all matches the book (those are all factory parts for Firebird/Camaro and AFAIK the TV valve and linkage were the same for 700s in those cars).

Of course, there's no replacement for a good visual inspection, as you know. I asked myself "why is there a spring on the TV cable?" I remembered some issue decades back of needing the cable a little shorter than the "retract and floor it" method provided, but it was limiting the throttle to 80% or something (oh, the humanity). An online vendor provided the spring as a fix, everything worked good and I drove for many years. I pulled it off tonight, reset the TV cable by the book and bam! Runs good. Downshift to 1st when I slow down, grabs gears at reasonable times and feels firm when there's any throttle. What's gone is the needlessly harsh 1-2 when I'm creeping along (i.e. trails).
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I'm going to re-check line pressure and fluid level and then start planning some adventures.
 
There's a lot I don't know about transmissions and now I've gone down a rabbit hole with line pressure. What I've realized it that line pressure isn't TV pressure. I recorded some numbers below, but they're not at full TV. They're at whatever throttle yields 1000RPM. I tried pulling the TV cable separate from the throttle and it just acts weird, like getting stuck at 120psi until the engine is restarted.

Driving on the road it's varying from like 80-140 psi, but the shift points vary way more than that. So it's probably fine. It drives good. There are RPMs where the gauge needle is flipping around violently. Is that bad or normal or is it just the cheap gauge?20260605_192318.jpg
 
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At idle, any movement of the TV cable changes line pressure, so that indicates the adjustment is right. But line pressure is also affected by what gear you're in. 2 or 1 is higher than 3 or D and reverse is the highest. So that composite signal doesn't really tell you directly what TV is doing.
 
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