Shift flare at WOT w/ carbed app on 700R4
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Joined: Nov 2001
Posts: 870
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From: Savannah, GA
Car: 3
Engine: inboard
Transmission: underfloor
Shift flare at WOT w/ carbed app on 700R4
My Probuilt 700R4 is giving me what I can best describe as a flare or slip on the 1-2 and 2-3 shifts.
Back in November I took a trip to Ft.Lauderdale (from Savannah, GA- about 470 miles) with the truck as I had stuff to bring back from there. I did not pay attention to the mileage (typical non accurate fuel gauge in an S10) and ran out of gas right at an exit. I popped it into nuetral and coasted to the shoulder.
I walked/jogged the 1/4 mile to my friend's hobby shop and got a jug of gas- when I came back I noticed a pool of trans fluid under the truck. Before the trip I added maybe a pint and a half as it was a tad low- and that brought it up to FULL with the trans cool, but the engine idling.
After getting the truck started and getting to a gas station, I checked the fluid to add some, and found with it warm that it was just below full on the stick. I did not add any more. I took some brake kleen and hosed the thing down under the truck as best as I could. I drove around the area all week in traffic and on the interstate and it did not puke one more drop out. The only thing I could think of was I had overfilled it when cold in Savannah and it came out the breather when it was hot and the engine shut off while it was still coasting.
The trans shifted fine after that, like butter under light throttle, and nice and snappy under full throttle, both left in "D" and run up on the redline or by hand.
I did a cylinder head swap a month back- this of course got the TV cable setting messed up, and the bracket I am using may have gotten tweaked a bit (LG4/L69 style bracket for a Q-jet application) I have adjusted this thing to get the shifts where they need to be, but now it does not shift hard on WOT. It seems to hang there or "slip" momentarily- on the 1-2 and 2-3. I want to take this thing to the track before summer heat sets in, so I am trying to work this out.
Is it possible that when I was testing this thing and had the TV cable set wrong under WOT I messed somthing up, burned clutches due to low line pressure, or do I just have a valve sticking in the valve body? Or is my pump or converter going out on me?
This is the "street strip' version of the trans, using Probuilt's blend of fluid, basically a mix of ATF and what I believe to be CAT TO30 transmission oil. The fluid is clean, and the trans has about 30,000 miles on it.
I hope it's an in the chassis fix.
Back in November I took a trip to Ft.Lauderdale (from Savannah, GA- about 470 miles) with the truck as I had stuff to bring back from there. I did not pay attention to the mileage (typical non accurate fuel gauge in an S10) and ran out of gas right at an exit. I popped it into nuetral and coasted to the shoulder.
I walked/jogged the 1/4 mile to my friend's hobby shop and got a jug of gas- when I came back I noticed a pool of trans fluid under the truck. Before the trip I added maybe a pint and a half as it was a tad low- and that brought it up to FULL with the trans cool, but the engine idling.
After getting the truck started and getting to a gas station, I checked the fluid to add some, and found with it warm that it was just below full on the stick. I did not add any more. I took some brake kleen and hosed the thing down under the truck as best as I could. I drove around the area all week in traffic and on the interstate and it did not puke one more drop out. The only thing I could think of was I had overfilled it when cold in Savannah and it came out the breather when it was hot and the engine shut off while it was still coasting.
The trans shifted fine after that, like butter under light throttle, and nice and snappy under full throttle, both left in "D" and run up on the redline or by hand.
I did a cylinder head swap a month back- this of course got the TV cable setting messed up, and the bracket I am using may have gotten tweaked a bit (LG4/L69 style bracket for a Q-jet application) I have adjusted this thing to get the shifts where they need to be, but now it does not shift hard on WOT. It seems to hang there or "slip" momentarily- on the 1-2 and 2-3. I want to take this thing to the track before summer heat sets in, so I am trying to work this out.
Is it possible that when I was testing this thing and had the TV cable set wrong under WOT I messed somthing up, burned clutches due to low line pressure, or do I just have a valve sticking in the valve body? Or is my pump or converter going out on me?
This is the "street strip' version of the trans, using Probuilt's blend of fluid, basically a mix of ATF and what I believe to be CAT TO30 transmission oil. The fluid is clean, and the trans has about 30,000 miles on it.
I hope it's an in the chassis fix.
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Damon
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Sep 26, 2015 04:29 PM
